mirror of
https://github.com/haskell-nix/hnix-store.git
synced 2024-08-17 13:51:21 +03:00
WIP
A hie.yaml M hnix-store-core/hnix-store-core.cabal M hnix-store-core/src/System/Nix/Hash.hs M hnix-store-core/src/System/Nix/Internal/Base.hs M hnix-store-core/src/System/Nix/Internal/Base32.hs M hnix-store-core/src/System/Nix/Internal/Old.hs M hnix-store-core/src/System/Nix/Internal/SriHash.hs M hnix-store-core/src/System/Nix/Internal/StorePath.hs D hnix-store-core/src/System/Nix/Internal/TruncatedHash.1hs A hnix-store-core/src/System/Nix/Internal/TruncatedHash.hs A hnix-store-core/src/System/Nix/Internal/Uncycle.hs
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13
hie.yaml
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13
hie.yaml
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@ -0,0 +1,13 @@
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cradle:
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cabal:
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- path: "./hnix-store-core/src"
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component: "lib:hnix-store-core"
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- path: "./hnix-store-core/tests"
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component: "hnix-store-core:test:format-tests"
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- path: "./hnix-store-remote/src"
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component: "lib:hnix-store-remote"
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- path: "./hnix-store-remote/tests"
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component: "hnix-store-remote:test:hnix-store-remote-tests"
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@ -50,6 +50,7 @@ library
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, base16-bytestring
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, base64-bytestring
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, bytestring
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, bytestring-show
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, cereal
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, containers
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, cryptonite
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@ -57,6 +58,7 @@ library
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, cryptohash-sha1
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, cryptohash-sha256
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, cryptohash-sha512
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, digits
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, directory
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, filepath
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, hashable
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@ -67,6 +69,7 @@ library
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, saltine
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, time
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, text
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, text-builder
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, unix
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, unordered-containers
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, vector
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@ -7,7 +7,6 @@ module System.Nix.Hash (
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, HNix.HashAlgorithm(..)
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, HNix.ValidAlgo(..)
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, HNix.NamedAlgo(..)
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, HNix.SomeNamedDigest(..)
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, HNix.hash
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, HNix.hashLazy
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, SRI.mkNamedDigest
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@ -18,5 +17,6 @@ module System.Nix.Hash (
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) where
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import qualified System.Nix.Internal.Old as HNix
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import qualified System.Nix.Internal.Hash as H
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import qualified System.Nix.Internal.Base as B
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import qualified System.Nix.Internal.SriHash as SRI
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@ -5,10 +5,13 @@
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module System.Nix.Internal.Base where
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import qualified Data.Text as T
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import qualified Data.Text.Encoding as T
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import qualified Data.ByteString.Base16 as Bytes.Base16
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import qualified System.Nix.Base32 as Bytes.Base32 -- Nix has own Base32 encoding
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import qualified Data.ByteString.Base64 as Bytes.Base64
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import Data.Text (Text)
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import qualified Data.Text.Encoding as Text
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import Data.Coerce (coerce)
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import qualified System.Nix.Internal.Old as O
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import qualified System.Nix.Internal.Old as Old
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-- | Constructors to indicate the base encodings
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@ -19,23 +22,23 @@ data BaseEncoding
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| Base64
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-- | Take BaseEncoding type of the output -> take the Digeest as input -> encode O.Digest
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encodeInBase :: BaseEncoding -> O.Digest a -> T.Text
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encodeInBase Base16 = T.decodeUtf8 . Base16.encode . coerce
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encodeInBase Base32 = Base32.encode . coerce
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encodeInBase Base64 = T.decodeUtf8 . Base64.encode . coerce
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-- | Take BaseEncoding type of the output -> take the Digeest as input -> encode Digest
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encodeInBytes :: BaseEncoding -> Old.Digest a -> Text
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encodeInBytes Base16 = Text.decodeUtf8 . Bytes.Base16.encode . coerce
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encodeInBytes Base32 = Text.decodeUtf8 . Bytes.Base32.encode . coerce
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encodeInBytes Base64 = Text.decodeUtf8 . Bytes.Base64.encode . coerce
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-- | Take BaseEncoding type of the input -> take the input itself -> decodeBase into O.Digest
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decodeBase :: BaseEncoding -> T.Text -> Either String (O.Digest a)
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-- | Take BaseEncoding type of the input -> take the input itself -> decodeBase into Digest
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decodeBase :: BaseEncoding -> Text -> Either String (Old.Digest a)
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#if MIN_VERSION_base16_bytestring(1,0,0)
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decodeBase Base16 = fmap O.Digest . Base16.decode . T.encodeUtf8
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decodeBase Base16 = fmap Old.Digest . Bytes.Base16.decode . Text.encodeUtf8
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#else
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decodeBase Base16 = lDecode -- this tacit sugar simply makes GHC pleased with number of args
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where
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lDecode t = case Base16.decode (T.encodeUtf8 t) of
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(x, "") -> Right $ O.Digest x
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_ -> Left $ "Unable to decode base16 string" <> T.unpack t
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lDecode t = case Base16.decode (Text.encodeUtf8 t) of
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(x, "") -> Right $ Old.Digest x
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_ -> Left $ "Unable to decode base16 string" <> Text.unpack t
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#endif
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decodeBase Base32 = fmap O.Digest . Base32.decode
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decodeBase Base64 = fmap O.Digest . Base64.decode . T.encodeUtf8
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decodeBase Base32 = fmap Old.Digest . Bytes.Base32.decode . Text.encodeUtf8
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decodeBase Base64 = fmap Old.Digest . Bytes.Base64.decode . Text.encodeUtf8
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@ -1,27 +1,40 @@
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{-# LANGUAGE OverloadedStrings #-}
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-- | Nix has Nix-specific Base32 encoding.
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-- Stick to using the Text. But lib provides ByteString (Bytes) just for unsafe optimization case.
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module System.Nix.Internal.Base32 where
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import Data.ByteString (ByteString)
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import Data.Bits (shiftR)
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import Data.List (unfoldr)
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import Data.Maybe
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import Data.Text (Text)
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import qualified Data.Text as Text
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import qualified Text.Builder
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import Data.ByteString (ByteString)
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import qualified Data.ByteString as Bytes
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import qualified Data.ByteString.Char8 as Bytes.Char8
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import qualified Data.ByteString.Internal as Bytes (c2w, unpackChars)
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import Data.Bits (shiftR)
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import Data.Vector (Vector)
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import qualified Data.Vector as Vector
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import Data.Word (Word8)
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import Numeric (readInt)
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import qualified Data.Maybe
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import qualified Data.ByteString
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import qualified Data.ByteString.Char8
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import qualified Data.Text
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import qualified Data.Vector
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-- Special Nix Base 32 dictinary with omitted: {E,O,U,T}
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dictNixBase32 :: Vector Char
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dictNixBase32 = Data.Vector.fromList "0123456789abcdfghijklmnpqrsvwxyz"
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dictNixBase32 = Vector.fromList "0123456789abcdfghijklmnpqrsvwxyz"
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dictNixBase32Bytes :: Vector Word8
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dictNixBase32Bytes = Vector.fromList (fmap Bytes.c2w "0123456789abcdfghijklmnpqrsvwxyz")
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-- | Encode a 'BS.ByteString' in Nix's base32 encoding
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encode :: ByteString -> Text
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encode c = Data.Text.pack $ map char32 [nChar - 1, nChar - 2 .. 0]
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type NixBase32 = Text
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type NixBase32Bytes = ByteString
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-- | Encode a Text in Nix-specific Base32 encoding
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encode :: Text -> NixBase32
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encode text = Text.pack $ fmap char32 [nChar - 1, nChar - 2 .. 0]
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where
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-- Each base32 character gives us 5 bits of information, while
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-- each byte gives is 8. Because 'div' rounds down, we need to add
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@ -30,60 +43,135 @@ encode c = Data.Text.pack $ map char32 [nChar - 1, nChar - 2 .. 0]
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-- bytestring to cover for the case where the number of bits is
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-- already a factor of 5. Thus, the + 1 outside of the 'div' and
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-- the - 1 inside of it.
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nChar = fromIntegral $ succ $ (Data.ByteString.length c * 8 - 1) `div` 5
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nChar = fromIntegral $ succ $ (Text.length text * 8 - 1) `div` 5
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byte = Data.ByteString.index c . fromIntegral
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char = Text.index text . fromIntegral
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-- May need to switch to a more efficient calculation at some
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-- point.
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bAsInteger :: Integer
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bAsInteger = sum [fromIntegral (byte j) * (256 ^ j)
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| j <- [0 .. Data.ByteString.length c - 1]
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bAsInteger = sum [fromIntegral (char j) * (256 ^ j)
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| j <- [0 .. Text.length text - 1]
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]
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char32 :: Integer -> Char
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char32 i = dictNixBase32 Data.Vector.! digitInd
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char32 i = dictNixBase32 Vector.! digitInd
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where
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digitInd = fromIntegral $
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bAsInteger
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`div` (32^i)
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`mod` 32
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-- | Decode Nix's base32 encoded text
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decode :: Text -> Either String ByteString
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-- | Encode a ByteString in Nix-specific Base32 encoding
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encodeBytes :: ByteString -> NixBase32Bytes
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encodeBytes bytes = Bytes.pack $ fmap char32 [nChar - 1, nChar - 2 .. 0]
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where
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-- Each base32 character gives us 5 bits of information, while
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-- each byte gives is 8. Because 'div' rounds down, we need to add
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-- one extra character to the result, and because of that extra 1
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-- we need to subtract one from the number of bits in the
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-- bytestring to cover for the case where the number of bits is
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-- already a factor of 5. Thus, the + 1 outside of the 'div' and
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-- the - 1 inside of it.
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nChar = fromIntegral $ succ $ (Bytes.length bytes * 8 - 1) `div` 5
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char32 :: Integer -> Word8
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char32 i = dictNixBase32Bytes Vector.! digitInd
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where
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digitInd = fromIntegral $
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bAsInteger
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`div` (32^i)
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`mod` 32
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-- May need to switch to a more efficient calculation at some
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-- point.
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bAsInteger :: Integer
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bAsInteger = sum [fromIntegral (byte j) * (256 ^ j)
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| j <- [0 .. Bytes.length bytes - 1]
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]
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byte = Bytes.index bytes . fromIntegral
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-- | Decode from Nix-specific Base32 encoding.
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decode :: NixBase32 -> Either String Text
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decode what =
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if Data.Text.all (`elem` dictNixBase32) what
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if Text.all (`elem` dictNixBase32) what
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then unsafeDecode what
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else Left "Invalid base32 string"
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else Left "Invalid Nix-Base32 string"
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-- | Decode Nix's base32 encoded text
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-- Doesn't check if all elements match `dictNixBase32`
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unsafeDecode :: Text -> Either String ByteString
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-- | Decode from Nix-specific Base32 encoding.
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decodeToBytes :: NixBase32Bytes -> Either String ByteString
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decodeToBytes what =
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if Bytes.all (`elem` dictNixBase32Bytes) what
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then unsafeDecodeToBytes what
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else Left "Invalid Nix-Base32 string"
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-- | Fast decoding from Nix-specific Base32 encoding.
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-- Doesn't check if all elements match `dictNixBase32`.
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unsafeDecode :: NixBase32 -> Either String Text
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unsafeDecode what =
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case readInt 32
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(`elem` dictNixBase32)
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(\c -> Data.Maybe.fromMaybe (error "character not in dictNixBase32")
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$ Data.Vector.findIndex (==c) dictNixBase32)
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(Data.Text.unpack what)
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of
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[(i, _)] -> Right $ padded $ integerToBS i
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x -> Left $ "Can't decode: readInt returned " ++ show x
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where
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padded x
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| Data.ByteString.length x < decLen = x `Data.ByteString.append` bstr
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| otherwise = x
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where
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bstr = Data.ByteString.Char8.pack $ take (decLen - Data.ByteString.length x) (cycle "\NUL")
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-- 2021-01-31: NOTE: `text-show` has a faster version of this implementation,
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-- because here Text -> String happens for readInt.
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case readIntegerIntoString $ Text.unpack what of
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[(i, _)] -> Right $ padded $ integerToText i
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x -> Left $ "Can't decode `readInt` returned : " <> show x
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where
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readIntegerIntoString :: (ReadS Integer)
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readIntegerIntoString =
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readInt
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32
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(`elem` dictNixBase32)
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(\ c -> Data.Maybe.fromMaybe
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(error "character not in dictNixBase32")
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$ Vector.findIndex (== c) dictNixBase32)
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decLen = Data.Text.length what * 5 `div` 8
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padded :: (Text -> Text)
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padded x
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| Text.length x < decLen = x <> bstr
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| otherwise = x
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where
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bstr = Text.pack $ take (decLen - Text.length x) (cycle "\NUL")
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decLen = Text.length what * 5 `div` 8
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-- | Encode an Integer to a bytestring
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-- | Fast decoding from Nix-specific Base32 encoding.
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-- Doesn't check if all elements match `dictNixBase32`.
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unsafeDecodeToBytes :: NixBase32Bytes -> Either String ByteString
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unsafeDecodeToBytes what =
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case readIntegerIntoString $ Bytes.unpackChars what of
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[(i, _)] -> Right $ padded $ integerToBytes i
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x -> Left $ "Can't decode `readInt` returned : " <> show x
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where
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readIntegerIntoString :: (ReadS Integer)
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readIntegerIntoString =
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readInt
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32
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-- 2021-01-30: NOTE: Use of `readInt` that requires `Char -> Bytestring` convertion a bit defeats a ByteString pipeline.
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-- Using dictNixBase32 with Char because of it
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(`elem` dictNixBase32)
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(\ c -> Data.Maybe.fromMaybe
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(error "character not in dictNixBase32")
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$ Vector.findIndex (== c) dictNixBase32)
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padded x
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| Bytes.length x < decLen = x <> bstr
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| otherwise = x
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where
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bstr = Bytes.Char8.pack $ take (decLen - Bytes.length x) (cycle "\NUL")
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decLen = Bytes.length what * 5 `div` 8
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-- | Encode an Integer to a Text
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integerToText :: Integer -> Text
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integerToText = Text.Builder.run . Text.Builder.decimal
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-- | Encode an Integer to a ByteString
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-- Similar to Data.Base32String (integerToBS) without `reverse`
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integerToBS :: Integer -> ByteString
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integerToBS 0 = Data.ByteString.pack [0]
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integerToBS i
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| i > 0 = Data.ByteString.pack $ unfoldr f i
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| otherwise = error "integerToBS not defined for negative values"
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where
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f 0 = Nothing
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f x = Just (fromInteger x :: Word8, x `shiftR` 8)
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integerToBytes :: Integer -> ByteString
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integerToBytes i
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| i > 0 = Bytes.unfoldr f i
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| i == 0 = Bytes.empty
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| otherwise = error "integerToBytes not defined for negative values."
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where
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f 0 = Nothing
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f x = Just (fromInteger x :: Word8, x `shiftR` 8)
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|
@ -15,32 +15,18 @@ Description : Cryptographic hashing interface for hnix-store, on top
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module System.Nix.Internal.Old where
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import qualified "cryptohash-md5" Crypto.Hash.MD5 as MD5
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import qualified "cryptohash-sha1" Crypto.Hash.SHA1 as SHA1
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import qualified "cryptohash-sha256" Crypto.Hash.SHA256 as SHA256
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import qualified "cryptohash-sha512" Crypto.Hash.SHA512 as SHA512
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import qualified Data.ByteString as BS
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import qualified Data.ByteString.Base16 as Base16
|
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import qualified System.Nix.Base32 as Base32 -- Nix has own Base32 encoding
|
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import qualified Data.ByteString.Base64 as Base64
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import Data.Bits (xor)
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import qualified Data.ByteString.Lazy as BSL
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import qualified Data.ByteString as Bytes
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import qualified Data.ByteString.Lazy as LazyBytes
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import qualified Data.Hashable as DataHashable
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import Data.List (find, foldl')
|
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import Data.Proxy (Proxy(Proxy))
|
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import Data.List (foldl')
|
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import Data.Text (Text)
|
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import qualified Data.Text as T
|
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import qualified Data.Text.Encoding as T
|
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import Data.Word (Word8)
|
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import GHC.TypeLits (Nat, KnownNat, natVal)
|
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import Data.Coerce (coerce)
|
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import GHC.TypeLits (Nat)
|
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|
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-- | Constructors to indicate the base encodings
|
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data BaseEncoding
|
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= Base16
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| Base32
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-- ^ Nix has a special map of Base32 encoding
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| Base64
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|
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-- | The universe of supported hash algorithms.
|
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--
|
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@ -73,10 +59,8 @@ instance HashProperties HashAlgorithm
|
||||
|
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-- | The result of running a 'HashAlgorithm'.
|
||||
newtype Digest (a :: HashAlgorithm) =
|
||||
Digest BS.ByteString deriving (Eq, Ord, DataHashable.Hashable)
|
||||
Digest Bytes.ByteString deriving (Eq, Ord, DataHashable.Hashable)
|
||||
|
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instance Show (Digest a) where
|
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show = ("Digest " <>) . show . encodeInBase Base32
|
||||
|
||||
-- | The primitive interface for incremental hashing for a given
|
||||
-- 'HashAlgorithm'. Every 'HashAlgorithm' should have an instance.
|
||||
@ -87,7 +71,7 @@ class ValidAlgo (a :: HashAlgorithm) where
|
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-- | Start building a new hash.
|
||||
initialize :: AlgoCtx a
|
||||
-- | Append a 'BS.ByteString' to the overall contents to be hashed.
|
||||
update :: AlgoCtx a -> BS.ByteString -> AlgoCtx a
|
||||
update :: AlgoCtx a -> Bytes.ByteString -> AlgoCtx a
|
||||
-- | Finish hashing and generate the output.
|
||||
finalize :: AlgoCtx a -> Digest a
|
||||
|
||||
@ -113,89 +97,25 @@ instance NamedAlgo 'SHA512 where
|
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algoName = "sha512"
|
||||
hashSize = 64
|
||||
|
||||
-- | A digest whose 'NamedAlgo' is not known at compile time.
|
||||
data SomeNamedDigest = forall a . NamedAlgo a => SomeDigest (Digest a)
|
||||
|
||||
instance Show SomeNamedDigest where
|
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show (SomeDigest (digest :: Digest hashType)) = T.unpack $ "SomeDigest " <> algoName @hashType <> ":" <> encodeInBase Base32 digest
|
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|
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mkNamedDigest :: Text -> Text -> Either String SomeNamedDigest
|
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mkNamedDigest name sriHash =
|
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let (sriName, h) = T.breakOnEnd "-" sriHash in
|
||||
if sriName == "" || sriName == (name <> "-")
|
||||
then mkDigest h
|
||||
else Left $ T.unpack $ "Sri hash method " <> sriName <> " does not match the required hash type " <> name
|
||||
where
|
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mkDigest :: Text -> Either String SomeNamedDigest
|
||||
mkDigest h =
|
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maybe (Left $ "Unknown hash name: " <> T.unpack name) (`decodeToSomeDigest` h) maybeFindHashTypeByName
|
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|
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maybeFindHashTypeByName :: Maybe HashAlgorithm
|
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maybeFindHashTypeByName = find (\ hashType -> canonicalHashName hashType == name ) [SHA256, MD5, SHA1, SHA512] -- SHA256 is the most used in Nix - so it matches first
|
||||
|
||||
decodeToSomeDigest :: HashAlgorithm -> Text -> Either String SomeNamedDigest
|
||||
decodeToSomeDigest MD5 = fmap SomeDigest . goDecode @'MD5
|
||||
decodeToSomeDigest SHA1 = fmap SomeDigest . goDecode @'SHA1
|
||||
decodeToSomeDigest SHA256 = fmap SomeDigest . goDecode @'SHA256
|
||||
decodeToSomeDigest SHA512 = fmap SomeDigest . goDecode @'SHA512
|
||||
|
||||
goDecode :: forall a . (NamedAlgo a, ValidAlgo a) => Text -> Either String (Digest a)
|
||||
goDecode h =
|
||||
-- Base encoding detected by comparing the lengths of the hash in Base to the canonical length of the demanded hash type
|
||||
maybe left (`decodeBase` h) maybeFindBaseEncByLenMatch
|
||||
where
|
||||
left = Left $ T.unpack sriHash <> " is not a valid " <> T.unpack name <> " hash. Its length (" <> show (T.length h) <> ") does not match any of " <> show (canonicalLenIf <$> bases)
|
||||
|
||||
maybeFindBaseEncByLenMatch = find (\ enc -> T.length h == canonicalLenIf enc) bases
|
||||
|
||||
expectedHashLen = hashSize @a
|
||||
|
||||
canonicalLenIf Base16 = 2 * expectedHashLen
|
||||
canonicalLenIf Base32 = ((8 * expectedHashLen - 1) `div` 5) + 1
|
||||
canonicalLenIf Base64 = ((4 * expectedHashLen `div` 3) + 3) `div` 4 * 4
|
||||
bases = [Base32, Base16, Base64] -- 32 is the most used in Nix - so the first match
|
||||
|
||||
|
||||
-- | Hash an entire (strict) 'BS.ByteString' as a single call.
|
||||
-- | Hash an entire (strict) 'ByteString' as a single call.
|
||||
--
|
||||
-- For example:
|
||||
-- > let d = hash "Hello, sha-256!" :: Digest SHA256
|
||||
-- or
|
||||
-- > :set -XTypeApplications
|
||||
-- > let d = hash @SHA256 "Hello, sha-256!"
|
||||
hash :: forall a.ValidAlgo a => BS.ByteString -> Digest a
|
||||
hash :: forall a.ValidAlgo a => Bytes.ByteString -> Digest a
|
||||
hash bs =
|
||||
finalize $ update @a (initialize @a) bs
|
||||
|
||||
-- | Hash an entire (lazy) 'BSL.ByteString' as a single call.
|
||||
-- | Hash an entire (lazy) 'ByteString' as a single call.
|
||||
--
|
||||
-- Use is the same as for 'hash'. This runs in constant space, but
|
||||
-- forces the entire bytestring.
|
||||
hashLazy :: forall a.ValidAlgo a => BSL.ByteString -> Digest a
|
||||
hashLazy :: forall a.ValidAlgo a => LazyBytes.ByteString -> Digest a
|
||||
hashLazy bsl =
|
||||
finalize $ foldl' (update @a) (initialize @a) (BSL.toChunks bsl)
|
||||
|
||||
|
||||
-- | Take BaseEncoding type of the output -> take the Digeest as input -> encode Digest
|
||||
encodeInBase :: BaseEncoding -> Digest a -> T.Text
|
||||
encodeInBase Base16 = T.decodeUtf8 . Base16.encode . coerce
|
||||
encodeInBase Base32 = Base32.encode . coerce
|
||||
encodeInBase Base64 = T.decodeUtf8 . Base64.encode . coerce
|
||||
|
||||
|
||||
-- | Take BaseEncoding type of the input -> take the input itself -> decodeBase into Digest
|
||||
decodeBase :: BaseEncoding -> T.Text -> Either String (Digest a)
|
||||
#if MIN_VERSION_base16_bytestring(1,0,0)
|
||||
decodeBase Base16 = fmap Digest . Base16.decode . T.encodeUtf8
|
||||
#else
|
||||
decodeBase Base16 = lDecode -- this tacit sugar simply makes GHC pleased with number of args
|
||||
where
|
||||
lDecode t = case Base16.decode (T.encodeUtf8 t) of
|
||||
(x, "") -> Right $ Digest x
|
||||
_ -> Left $ "Unable to decode base16 string" <> T.unpack t
|
||||
#endif
|
||||
decodeBase Base32 = fmap Digest . Base32.decode
|
||||
decodeBase Base64 = fmap Digest . Base64.decode . T.encodeUtf8
|
||||
finalize $ foldl' (update @a) (initialize @a) (LazyBytes.toChunks bsl)
|
||||
|
||||
|
||||
-- | Uses "Crypto.Hash.MD5" from cryptohash-md5.
|
||||
@ -225,36 +145,3 @@ instance ValidAlgo 'SHA512 where
|
||||
initialize = SHA512.init
|
||||
update = SHA512.update
|
||||
finalize = Digest . SHA512.finalize
|
||||
|
||||
-- | Reuses the underlying 'ValidAlgo' instance, but does a
|
||||
-- 'truncateDigest' at the end.
|
||||
instance (ValidAlgo a, KnownNat n) => ValidAlgo ('Truncated n a) where
|
||||
type AlgoCtx ('Truncated n a) = AlgoCtx a
|
||||
initialize = initialize @a
|
||||
update = update @a
|
||||
finalize = truncateDigest @n . finalize @a
|
||||
|
||||
-- | Bytewise truncation of a 'Digest'.
|
||||
--
|
||||
-- When truncation length is greater than the length of the bytestring
|
||||
-- but less than twice the bytestring length, truncation splits the
|
||||
-- bytestring into a head part (truncation length) and tail part
|
||||
-- (leftover part), right-pads the leftovers with 0 to the truncation
|
||||
-- length, and combines the two strings bytewise with 'xor'.
|
||||
truncateDigest
|
||||
:: forall n a.(KnownNat n) => Digest a -> Digest ('Truncated n a)
|
||||
truncateDigest (Digest c) =
|
||||
Digest $ BS.pack $ map truncOutputByte [0.. n-1]
|
||||
where
|
||||
n = fromIntegral $ natVal (Proxy @n)
|
||||
|
||||
truncOutputByte :: Int -> Word8
|
||||
truncOutputByte i = foldl' (aux i) 0 [0 .. BS.length c - 1]
|
||||
|
||||
inputByte :: Int -> Word8
|
||||
inputByte j = BS.index c (fromIntegral j)
|
||||
|
||||
aux :: Int -> Word8 -> Int -> Word8
|
||||
aux i x j = if j `mod` fromIntegral n == fromIntegral i
|
||||
then xor x (inputByte $ fromIntegral j)
|
||||
else x
|
||||
|
@ -1,42 +1,45 @@
|
||||
{-# LANGUAGE ScopedTypeVariables #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE TypeApplications #-}
|
||||
{-# LANGUAGE DataKinds #-}
|
||||
|
||||
module System.Nix.Internal.SriHash where
|
||||
|
||||
import qualified System.Nix.Internal.Old as O
|
||||
import qualified System.Nix.Internal.Base as B
|
||||
import Data.Text (Text)
|
||||
import qualified Data.Text as Text
|
||||
import qualified System.Nix.Internal.Old as Old
|
||||
import qualified System.Nix.Internal.Base as Base
|
||||
import Data.Foldable (find)
|
||||
|
||||
mkNamedDigest :: Text -> Text -> Either String O.SomeNamedDigest
|
||||
mkNamedDigest :: Text -> Text -> Either String (Old.Digest a)
|
||||
mkNamedDigest name sriHash =
|
||||
let (sriName, h) = T.breakOnEnd "-" sriHash in
|
||||
let (sriName, h) = Text.breakOnEnd "-" sriHash in
|
||||
if sriName == "" || sriName == (name <> "-")
|
||||
then mkDigest h
|
||||
else Left $ T.unpack $ "Sri hash method " <> sriName <> " does not match the required hash type " <> name
|
||||
else Left $ Text.unpack $ "Sri hash method " <> sriName <> " does not match the required hash type " <> name
|
||||
where
|
||||
mkDigest :: Text -> Either String O.SomeNamedDigest
|
||||
mkDigest :: Text -> Either String (Old.Digest a)
|
||||
mkDigest h =
|
||||
maybe (Left $ "Unknown hash name: " <> T.unpack name) (`decodeToSomeDigest` h) maybeFindHashTypeByName
|
||||
maybe (Left $ "Unknown hash name: " <> Text.unpack name) (`decodeToSomeDigest` h) maybeFindHashTypeByName
|
||||
|
||||
maybeFindHashTypeByName :: Maybe O.HashAlgorithm
|
||||
maybeFindHashTypeByName = find (\ hashType -> O.canonicalHashName hashType == name ) [O.SHA256, O.MD5, O.SHA1, O.SHA512] -- SHA256 is the most used in Nix - so it matches first
|
||||
maybeFindHashTypeByName :: Maybe Old.HashAlgorithm
|
||||
maybeFindHashTypeByName = find (\ hashType -> Old.canonicalHashName hashType == name ) [Old.SHA256, Old.MD5, Old.SHA1, Old.SHA512] -- SHA256 is the most used in Nix - so it matches first
|
||||
|
||||
decodeToSomeDigest :: O.HashAlgorithm -> Text -> Either String O.SomeNamedDigest
|
||||
decodeToSomeDigest O.MD5 = fmap O.SomeDigest . goDecode @'O.MD5
|
||||
decodeToSomeDigest O.SHA1 = fmap O.SomeDigest . goDecode @'O.SHA1
|
||||
decodeToSomeDigest O.SHA256 = fmap O.SomeDigest . goDecode @'O.SHA256
|
||||
decodeToSomeDigest O.SHA512 = fmap O.SomeDigest . goDecode @'O.SHA512
|
||||
decodeToSomeDigest :: Old.HashAlgorithm -> Text -> Either String (Old.Digest a)
|
||||
decodeToSomeDigest a s = goDecode a s
|
||||
|
||||
goDecode :: forall a . (O.NamedAlgo a, O.ValidAlgo a) => Text -> Either String (O.Digest a)
|
||||
goDecode h =
|
||||
goDecode :: Old.HashAlgorithm -> Text -> Either String (Old.Digest a)
|
||||
goDecode a s =
|
||||
-- Base encoding detected by comparing the lengths of the hash in Base to the canonical length of the demanded hash type
|
||||
maybe left (`B.decodeBase` h) maybeFindBaseEncByLenMatch
|
||||
maybe left (`Base.decodeBase` s) maybeFindBaseEncByLenMatch
|
||||
where
|
||||
left = Left $ T.unpack sriHash <> " is not a valid " <> T.unpack name <> " hash. Its length (" <> show (T.length h) <> ") does not match any of " <> show (canonicalLenIf <$> bases)
|
||||
left = Left $ Text.unpack sriHash <> " is not a valid " <> Text.unpack name <> " hash. Its length (" <> show (Text.length s) <> ") does not match any of " <> show (canonicalLenIf <$> bases)
|
||||
|
||||
maybeFindBaseEncByLenMatch = find (\ enc -> T.length h == canonicalLenIf enc) bases
|
||||
maybeFindBaseEncByLenMatch = find (\ enc -> Text.length s == canonicalLenIf enc) bases
|
||||
|
||||
expectedHashLen = O.hashSize @a
|
||||
expectedHashLen = Old.canonicalHashLen a
|
||||
|
||||
canonicalLenIf B.Base16 = 2 * expectedHashLen
|
||||
canonicalLenIf B.Base32 = ((8 * expectedHashLen - 1) `div` 5) + 1
|
||||
canonicalLenIf B.Base64 = ((4 * expectedHashLen `div` 3) + 3) `div` 4 * 4
|
||||
bases = [B.Base32, B.Base16, B.Base64] -- 32 is the most used in Nix - so the first match
|
||||
canonicalLenIf Base.Base16 = 2 * expectedHashLen
|
||||
canonicalLenIf Base.Base32 = ((8 * expectedHashLen - 1) `div` 5) + 1
|
||||
canonicalLenIf Base.Base64 = ((4 * expectedHashLen `div` 3) + 3) `div` 4 * 4
|
||||
bases = [Base.Base32, Base.Base16, Base.Base64] -- 32 is the most used in Nix - so the first match
|
||||
|
@ -8,32 +8,40 @@ Description : Representation of Nix store paths.
|
||||
{-# LANGUAGE ScopedTypeVariables #-}
|
||||
{-# LANGUAGE AllowAmbiguousTypes #-}
|
||||
{-# LANGUAGE TypeInType #-} -- Needed for GHC 8.4.4 for some reason
|
||||
|
||||
|
||||
module System.Nix.Internal.StorePath where
|
||||
|
||||
|
||||
import System.Nix.Hash
|
||||
( HashAlgorithm(Truncated, SHA256)
|
||||
( HashAlgorithm (SHA256)
|
||||
, Digest
|
||||
, BaseEncoding(..)
|
||||
, encodeInBase
|
||||
, decodeBase
|
||||
, SomeNamedDigest
|
||||
)
|
||||
import System.Nix.Internal.Old as Old
|
||||
import System.Nix.Internal.TruncatedHash as TruncatedHash
|
||||
import System.Nix.Internal.Base32 (dictNixBase32)
|
||||
|
||||
import Data.Bool (bool)
|
||||
import Data.Text (Text)
|
||||
import Data.Text.Encoding (encodeUtf8)
|
||||
import qualified Data.Text as T
|
||||
import qualified Data.Text as Text
|
||||
import qualified Data.Text.Encoding as Text (encodeUtf8)
|
||||
import Data.ByteString (ByteString)
|
||||
import qualified Data.ByteString as BS
|
||||
import qualified Data.ByteString.Char8 as BC
|
||||
import qualified Data.Char
|
||||
import qualified Data.ByteString as ByteString
|
||||
import qualified Data.ByteString.Char8 as ByteString.Char8
|
||||
import qualified Data.Char as Char
|
||||
import Data.Hashable (Hashable(..))
|
||||
import Data.HashSet (HashSet)
|
||||
|
||||
import Data.Attoparsec.Text.Lazy (Parser, (<?>))
|
||||
-- import Data.Attoparsec.Text.Lazy (Parser, (<?>))
|
||||
import Data.Attoparsec.ByteString.Lazy (Parser, (<?>))
|
||||
|
||||
import qualified Data.Attoparsec.Text.Lazy
|
||||
import qualified System.FilePath
|
||||
import qualified Data.Attoparsec.Text.Lazy as Parse.Text
|
||||
import qualified Data.Attoparsec.ByteString.Lazy as Parse.ByteString
|
||||
import qualified Data.Attoparsec.ByteString.Char8 as Parse.ByteString (char)
|
||||
import qualified System.FilePath as FilePath
|
||||
|
||||
-- | A path in a Nix store.
|
||||
--
|
||||
@ -61,7 +69,7 @@ instance Hashable StorePath where
|
||||
s `hashWithSalt` storePathHash `hashWithSalt` storePathName
|
||||
|
||||
instance Show StorePath where
|
||||
show p = BC.unpack $ storePathToRawFilePath p
|
||||
show p = ByteString.Char8.unpack $ storePathToRawFilePath p
|
||||
|
||||
-- | The name portion of a Nix path.
|
||||
--
|
||||
@ -73,7 +81,7 @@ newtype StorePathName = StorePathName
|
||||
} deriving (Eq, Hashable, Ord)
|
||||
|
||||
-- | The hash algorithm used for store path hashes.
|
||||
type StorePathHashAlgo = 'Truncated 20 'SHA256
|
||||
type StorePathHashAlgo = 'Old.Truncated 20 'SHA256
|
||||
|
||||
-- | A set of 'StorePath's.
|
||||
type StorePathSet = HashSet StorePath
|
||||
@ -92,10 +100,10 @@ data ContentAddressableAddress
|
||||
-- addTextToStore. It is addressed according to a sha256sum of the
|
||||
-- file contents.
|
||||
Text !(Digest 'SHA256)
|
||||
| -- | The path was added to the store via makeFixedOutputPath or
|
||||
-- addToStore. It is addressed according to some hash algorithm
|
||||
-- applied to the nar serialization via some 'NarHashMode'.
|
||||
Fixed !NarHashMode !SomeNamedDigest
|
||||
-- | -- | The path was added to the store via makeFixedOutputPath or
|
||||
-- -- addToStore. It is addressed according to some hash algorithm
|
||||
-- -- applied to the nar serialization via some 'NarHashMode'.
|
||||
-- Fixed !NarHashMode !(Digest 'HashAlgorithm)
|
||||
|
||||
-- | Schemes for hashing a Nix archive.
|
||||
--
|
||||
@ -115,26 +123,26 @@ makeStorePathName n = case validStorePathName n of
|
||||
|
||||
reasonInvalid :: Text -> String
|
||||
reasonInvalid n | n == "" = "Empty name"
|
||||
reasonInvalid n | (T.length n > 211) = "Path too long"
|
||||
reasonInvalid n | (T.head n == '.') = "Leading dot"
|
||||
reasonInvalid n | (Text.length n > 211) = "Path too long"
|
||||
reasonInvalid n | (Text.head n == '.') = "Leading dot"
|
||||
reasonInvalid _ | otherwise = "Invalid character"
|
||||
|
||||
validStorePathName :: Text -> Bool
|
||||
validStorePathName "" = False
|
||||
validStorePathName n = (T.length n <= 211)
|
||||
&& T.head n /= '.'
|
||||
&& T.all validateStorePathNameChar n
|
||||
validStorePathName n = (Text.length n <= 211)
|
||||
&& Text.head n /= '.'
|
||||
&& Text.all validateStorePathNameChar n
|
||||
|
||||
validateStorePathNameChar :: Char -> Bool
|
||||
validateStorePathNameChar c =
|
||||
bool
|
||||
False
|
||||
(any ($ c)
|
||||
[ Data.Char.isLower
|
||||
, Data.Char.isDigit
|
||||
, Data.Char.isUpper
|
||||
[ Char.isLower
|
||||
, Char.isDigit
|
||||
, Char.isUpper
|
||||
, (`elem` ("+-._?=" :: String))])
|
||||
(Data.Char.isAscii c)
|
||||
(Char.isAscii c)
|
||||
|
||||
-- | Copied from @RawFilePath@ in the @unix@ package, duplicated here
|
||||
-- to avoid the dependency.
|
||||
@ -146,7 +154,7 @@ storePathToRawFilePath
|
||||
-> RawFilePath
|
||||
storePathToRawFilePath StorePath{..} = root <> "/" <> hashPart <> "-" <> name
|
||||
where
|
||||
root = BC.pack storePathRoot
|
||||
root = ByteString.Char8.pack storePathRoot
|
||||
hashPart = encodeUtf8 $ encodeInBase Base32 storePathHash
|
||||
name = encodeUtf8 $ unStorePathName storePathName
|
||||
|
||||
@ -154,35 +162,35 @@ storePathToRawFilePath StorePath{..} = root <> "/" <> hashPart <> "-" <> name
|
||||
storePathToFilePath
|
||||
:: StorePath
|
||||
-> FilePath
|
||||
storePathToFilePath = BC.unpack . storePathToRawFilePath
|
||||
storePathToFilePath = ByteString.Char8.unpack . storePathToRawFilePath
|
||||
|
||||
-- | Render a 'StorePath' as a 'Text'.
|
||||
storePathToText
|
||||
:: StorePath
|
||||
-> Text
|
||||
storePathToText = T.pack . BC.unpack . storePathToRawFilePath
|
||||
storePathToText = Text.pack . ByteString.Char8.unpack . storePathToRawFilePath
|
||||
|
||||
-- | Build `narinfo` suffix from `StorePath` which
|
||||
-- can be used to query binary caches.
|
||||
storePathToNarInfo
|
||||
:: StorePath
|
||||
-> BC.ByteString
|
||||
-> ByteString.Char8.ByteString
|
||||
storePathToNarInfo StorePath{..} = storePathHashInNixBase <> ".narinfo"
|
||||
where
|
||||
storePathHashInNixBase = encodeUtf8 $ encodeInBase Base32 storePathHash
|
||||
|
||||
-- | Parse `StorePath` from `BC.ByteString`, checking
|
||||
-- | Parse `StorePath` from `ByteString.Char8.ByteString`, checking
|
||||
-- that store directory matches `expectedRoot`.
|
||||
parsePath
|
||||
:: FilePath
|
||||
-> BC.ByteString
|
||||
-> ByteString.Char8.ByteString
|
||||
-> Either String StorePath
|
||||
parsePath expectedRoot x =
|
||||
let
|
||||
(rootDir, fname) = System.FilePath.splitFileName . BC.unpack $ x
|
||||
(digestPart, namePart) = T.breakOn "-" $ T.pack fname
|
||||
(rootDir, fname) = FilePath.splitFileName . ByteString.Char8.unpack $ x
|
||||
(digestPart, namePart) = Text.breakOn "-" $ Text.pack fname
|
||||
digest = decodeBase Base32 digestPart
|
||||
name = makeStorePathName . T.drop 1 $ namePart
|
||||
name = makeStorePathName . Text.drop 1 $ namePart
|
||||
--rootDir' = dropTrailingPathSeparator rootDir
|
||||
-- cannot use ^^ as it drops multiple slashes /a/b/// -> /a/b
|
||||
rootDir' = init rootDir
|
||||
@ -192,28 +200,29 @@ parsePath expectedRoot x =
|
||||
in
|
||||
StorePath <$> digest <*> name <*> storeDir
|
||||
|
||||
-- 2021-01-30: NOTE: Converted Text parser to ByteString. This currently uses Char8
|
||||
pathParser :: FilePath -> Parser StorePath
|
||||
pathParser expectedRoot = do
|
||||
_ <- Data.Attoparsec.Text.Lazy.string (T.pack expectedRoot)
|
||||
_ <- Parse.ByteString.string (Text.pack expectedRoot)
|
||||
<?> "Store root mismatch" -- e.g. /nix/store
|
||||
|
||||
_ <- Data.Attoparsec.Text.Lazy.char '/'
|
||||
_ <- Parse.ByteString.char '/'
|
||||
<?> "Expecting path separator"
|
||||
|
||||
digest <- decodeBase Base32
|
||||
<$> Data.Attoparsec.Text.Lazy.takeWhile1 (`elem` dictNixBase32)
|
||||
<$> Parse.ByteString.takeWhile1 (`elem` dictNixBase32)
|
||||
<?> "Invalid Base32 part"
|
||||
|
||||
_ <- Data.Attoparsec.Text.Lazy.char '-'
|
||||
_ <- Parse.ByteString.char '-'
|
||||
<?> "Expecting dash (path name separator)"
|
||||
|
||||
c0 <- Data.Attoparsec.Text.Lazy.satisfy (\c -> c /= '.' && validateStorePathNameChar c)
|
||||
c0 <- Parse.ByteString.satisfy (\c -> c /= '.' && validateStorePathNameChar c)
|
||||
<?> "Leading path name character is a dot or invalid character"
|
||||
|
||||
rest <- Data.Attoparsec.Text.Lazy.takeWhile validateStorePathNameChar
|
||||
rest <- Parse.ByteString.takeWhile validateStorePathNameChar
|
||||
<?> "Path name contains invalid character"
|
||||
|
||||
let name = makeStorePathName $ T.cons c0 rest
|
||||
let name = makeStorePathName $ Text.cons c0 rest
|
||||
|
||||
either fail return
|
||||
$ StorePath <$> digest <*> name <*> pure expectedRoot
|
||||
|
@ -1,33 +0,0 @@
|
||||
|
||||
module System.Nix.Internal.TruncatedHash where
|
||||
|
||||
-- data TruncatedHash = Truncated HashAlgorithm Integer
|
||||
-- ^ The hash algorithm obtained by truncating the result of the
|
||||
-- input 'HashAlgorithm' to the given number of bytes. See
|
||||
-- 'truncateDigest' for a description of the truncation algorithm.
|
||||
|
||||
-- TODO: HNix really uses 1 type/length of truncation.
|
||||
-- | Bytewise truncation of a 'Digest'.
|
||||
--
|
||||
-- When truncation length is greater than the length of the bytestring
|
||||
-- but less than twice the bytestring length, truncation splits the
|
||||
-- bytestring into a head part (truncation length) and tail part
|
||||
-- (leftover part), right-pads the leftovers with 0 to the truncation
|
||||
-- length, and combines the two strings bytewise with 'xor'.
|
||||
-- truncateDigest
|
||||
-- :: forall n a.(KnownNat n) => Digest a -> Digest ('Truncated n a)
|
||||
-- truncateDigest (Digest c) =
|
||||
-- Digest $ BS.pack $ map truncOutputByte [0.. n-1]
|
||||
-- where
|
||||
-- n = fromIntegral $ natVal (Proxy @n)
|
||||
|
||||
-- truncOutputByte :: Int -> Word8
|
||||
-- truncOutputByte i = foldl' (aux i) 0 [0 .. BS.length c - 1]
|
||||
|
||||
-- inputByte :: Int -> Word8
|
||||
-- inputByte j = BS.index c (fromIntegral j)
|
||||
|
||||
-- aux :: Int -> Word8 -> Int -> Word8
|
||||
-- aux i x j = if j `mod` fromIntegral n == fromIntegral i
|
||||
-- then xor x (inputByte $ fromIntegral j)
|
||||
-- else x
|
61
hnix-store-core/src/System/Nix/Internal/TruncatedHash.hs
Normal file
61
hnix-store-core/src/System/Nix/Internal/TruncatedHash.hs
Normal file
@ -0,0 +1,61 @@
|
||||
{-# LANGUAGE PackageImports #-}
|
||||
{-# LANGUAGE ExistentialQuantification #-}
|
||||
{-# LANGUAGE TypeApplications #-}
|
||||
{-# LANGUAGE AllowAmbiguousTypes #-}
|
||||
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
|
||||
{-# LANGUAGE TypeFamilies #-}
|
||||
{-# LANGUAGE ScopedTypeVariables #-}
|
||||
{-# LANGUAGE TypeApplications #-}
|
||||
{-# LANGUAGE DataKinds #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE ExistentialQuantification #-}
|
||||
|
||||
|
||||
module System.Nix.Internal.TruncatedHash where
|
||||
|
||||
|
||||
import qualified Data.ByteString as ByteString
|
||||
import Data.Word (Word8)
|
||||
import Data.Foldable (foldl')
|
||||
import Data.Bits (xor)
|
||||
import System.Nix.Internal.Old as Old
|
||||
import Data.Bool (bool)
|
||||
import GHC.TypeLits (Nat, KnownNat, natVal)
|
||||
import Data.Proxy (Proxy(Proxy))
|
||||
|
||||
-- TODO: HNix really uses 1 type/length of truncation.
|
||||
|
||||
-- data TruncatedHash = Truncated Nat Old.HashAlgorithm
|
||||
|
||||
-- | Reuses the underlying 'ValidAlgo' instance, but does a
|
||||
-- 'truncateDigest' at the end.
|
||||
instance (Old.ValidAlgo a, KnownNat n) => Old.ValidAlgo ('Old.Truncated n a) where
|
||||
type AlgoCtx ('Old.Truncated n a) = AlgoCtx a
|
||||
initialize = initialize @a
|
||||
update = update @a
|
||||
finalize = truncateDigest @n . finalize @a
|
||||
|
||||
-- | Bytewise truncation of a 'Digest'.
|
||||
--
|
||||
-- When truncation length is greater than the length of the bytestring
|
||||
-- but less than twice the bytestring length, truncation splits the
|
||||
-- bytestring into a head part (truncation length) and tail part
|
||||
-- (leftover part), right-pads the leftovers with 0 to the truncation
|
||||
-- length, and combines the two strings bytewise with 'xor'.
|
||||
truncateDigest
|
||||
:: forall n a.(KnownNat n) => Old.Digest a -> Old.Digest ('Old.Truncated n a)
|
||||
truncateDigest (Old.Digest c) =
|
||||
Old.Digest $ ByteString.pack $ map truncOutputByte [0.. n-1]
|
||||
where
|
||||
n = fromIntegral $ natVal (Proxy @n)
|
||||
|
||||
truncOutputByte :: Int -> Word8
|
||||
truncOutputByte i = foldl' (aux i) 0 [0 .. ByteString.length c - 1]
|
||||
|
||||
inputByte :: Int -> Word8
|
||||
inputByte j = ByteString.index c (fromIntegral j)
|
||||
|
||||
aux :: Int -> Word8 -> Int -> Word8
|
||||
aux i x j = if j `mod` fromIntegral n == fromIntegral i
|
||||
then xor x (inputByte $ fromIntegral j)
|
||||
else x
|
194
hnix-store-core/src/System/Nix/Internal/Uncycle.hs
Normal file
194
hnix-store-core/src/System/Nix/Internal/Uncycle.hs
Normal file
@ -0,0 +1,194 @@
|
||||
{-|
|
||||
Description : Cryptographic hashing interface for hnix-store, on top
|
||||
of the cryptohash family of libraries.
|
||||
-}
|
||||
{-# LANGUAGE AllowAmbiguousTypes #-}
|
||||
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
|
||||
{-# LANGUAGE TypeFamilies #-}
|
||||
{-# LANGUAGE ScopedTypeVariables #-}
|
||||
{-# LANGUAGE TypeApplications #-}
|
||||
{-# LANGUAGE DataKinds #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE ExistentialQuantification #-}
|
||||
{-# LANGUAGE CPP #-}
|
||||
{-# LANGUAGE PackageImports #-}
|
||||
|
||||
module System.Nix.Internal.Uncycle where
|
||||
|
||||
|
||||
import qualified "cryptohash-md5" Crypto.Hash.MD5 as MD5
|
||||
import qualified "cryptohash-sha1" Crypto.Hash.SHA1 as SHA1
|
||||
import qualified "cryptohash-sha256" Crypto.Hash.SHA256 as SHA256
|
||||
import qualified "cryptohash-sha512" Crypto.Hash.SHA512 as SHA512
|
||||
import qualified Data.ByteString as BS
|
||||
import Data.Bits (xor)
|
||||
import qualified Data.ByteString.Lazy as BSL
|
||||
import qualified Data.Hashable as DataHashable
|
||||
import Data.List (foldl')
|
||||
import Data.Proxy (Proxy(Proxy))
|
||||
import Data.Text (Text)
|
||||
import qualified Data.Text as T
|
||||
import Data.Word (Word8)
|
||||
import GHC.TypeLits (Nat, KnownNat, natVal)
|
||||
import qualified System.Nix.Internal.Base as B
|
||||
import qualified System.Nix.Internal.Old as O
|
||||
|
||||
|
||||
-- | The universe of supported hash algorithms.
|
||||
--
|
||||
-- Currently only intended for use at the type level.
|
||||
data HashAlgorithm
|
||||
= MD5
|
||||
| SHA1
|
||||
| SHA256
|
||||
| SHA512
|
||||
| Truncated Nat HashAlgorithm
|
||||
-- ^ The hash algorithm obtained by truncating the result of the
|
||||
-- input 'HashAlgorithm' to the given number of bytes. See
|
||||
-- 'truncateDigest' for a description of the truncation algorithm.
|
||||
|
||||
class HashProperties a
|
||||
where
|
||||
canonicalHashName :: a -> Text
|
||||
canonicalHashLen :: a -> Int
|
||||
|
||||
instance HashProperties HashAlgorithm
|
||||
where
|
||||
canonicalHashName SHA256 = "sha256" -- SHA256 is the most used in Nix - so it matches first
|
||||
canonicalHashName MD5 = "md5"
|
||||
canonicalHashName SHA1 = "sha1"
|
||||
canonicalHashName SHA512 = "sha512"
|
||||
canonicalHashLen SHA256 = 32
|
||||
canonicalHashLen MD5 = 16
|
||||
canonicalHashLen SHA1 = 20
|
||||
canonicalHashLen SHA512 = 64
|
||||
|
||||
-- | The result of running a 'HashAlgorithm'.
|
||||
newtype Digest (a :: HashAlgorithm) =
|
||||
Digest BS.ByteString deriving (Eq, Ord, DataHashable.Hashable)
|
||||
|
||||
instance Show (Digest a) where
|
||||
show = ("Digest " <>) . show . encodeInBase Base32
|
||||
|
||||
-- | The primitive interface for incremental hashing for a given
|
||||
-- 'HashAlgorithm'. Every 'HashAlgorithm' should have an instance.
|
||||
class ValidAlgo (a :: HashAlgorithm) where
|
||||
-- | The incremental state for constructing a hash.
|
||||
type AlgoCtx a
|
||||
|
||||
-- | Start building a new hash.
|
||||
initialize :: AlgoCtx a
|
||||
-- | Append a 'BS.ByteString' to the overall contents to be hashed.
|
||||
update :: AlgoCtx a -> BS.ByteString -> AlgoCtx a
|
||||
-- | Finish hashing and generate the output.
|
||||
finalize :: AlgoCtx a -> Digest a
|
||||
|
||||
-- | A 'HashAlgorithm' with a canonical name, for serialization
|
||||
-- purposes (e.g. SRI hashes)
|
||||
class ValidAlgo a => NamedAlgo (a :: HashAlgorithm) where
|
||||
algoName :: Text
|
||||
hashSize :: Int
|
||||
|
||||
instance NamedAlgo 'MD5 where
|
||||
algoName = "md5"
|
||||
hashSize = 16
|
||||
|
||||
instance NamedAlgo 'SHA1 where
|
||||
algoName = "sha1"
|
||||
hashSize = 20
|
||||
|
||||
instance NamedAlgo 'SHA256 where
|
||||
algoName = "sha256"
|
||||
hashSize = 32
|
||||
|
||||
instance NamedAlgo 'SHA512 where
|
||||
algoName = "sha512"
|
||||
hashSize = 64
|
||||
|
||||
-- | A digest whose 'NamedAlgo' is not known at compile time.
|
||||
data SomeNamedDigest = forall a . NamedAlgo a => SomeDigest (Digest a)
|
||||
|
||||
instance Show SomeNamedDigest where
|
||||
show (SomeDigest (digest :: Digest hashType)) = T.unpack $ "SomeDigest " <> algoName @hashType <> ":" <> encodeInBase Base32 digest
|
||||
|
||||
|
||||
-- | Hash an entire (strict) 'BS.ByteString' as a single call.
|
||||
--
|
||||
-- For example:
|
||||
-- > let d = hash "Hello, sha-256!" :: Digest SHA256
|
||||
-- or
|
||||
-- > :set -XTypeApplications
|
||||
-- > let d = hash @SHA256 "Hello, sha-256!"
|
||||
hash :: forall a.ValidAlgo a => BS.ByteString -> Digest a
|
||||
hash bs =
|
||||
finalize $ update @a (initialize @a) bs
|
||||
|
||||
-- | Hash an entire (lazy) 'BSL.ByteString' as a single call.
|
||||
--
|
||||
-- Use is the same as for 'hash'. This runs in constant space, but
|
||||
-- forces the entire bytestring.
|
||||
hashLazy :: forall a.ValidAlgo a => BSL.ByteString -> Digest a
|
||||
hashLazy bsl =
|
||||
finalize $ foldl' (update @a) (initialize @a) (BSL.toChunks bsl)
|
||||
|
||||
|
||||
-- | Uses "Crypto.Hash.MD5" from cryptohash-md5.
|
||||
instance ValidAlgo 'MD5 where
|
||||
type AlgoCtx 'MD5 = MD5.Ctx
|
||||
initialize = MD5.init
|
||||
update = MD5.update
|
||||
finalize = Digest . MD5.finalize
|
||||
|
||||
-- | Uses "Crypto.Hash.SHA1" from cryptohash-sha1.
|
||||
instance ValidAlgo 'SHA1 where
|
||||
type AlgoCtx 'SHA1 = SHA1.Ctx
|
||||
initialize = SHA1.init
|
||||
update = SHA1.update
|
||||
finalize = Digest . SHA1.finalize
|
||||
|
||||
-- | Uses "Crypto.Hash.SHA256" from cryptohash-sha256.
|
||||
instance ValidAlgo 'SHA256 where
|
||||
type AlgoCtx 'SHA256 = SHA256.Ctx
|
||||
initialize = SHA256.init
|
||||
update = SHA256.update
|
||||
finalize = Digest . SHA256.finalize
|
||||
|
||||
-- | Uses "Crypto.Hash.SHA512" from cryptohash-sha512.
|
||||
instance ValidAlgo 'SHA512 where
|
||||
type AlgoCtx 'SHA512 = SHA512.Ctx
|
||||
initialize = SHA512.init
|
||||
update = SHA512.update
|
||||
finalize = Digest . SHA512.finalize
|
||||
|
||||
-- | Reuses the underlying 'ValidAlgo' instance, but does a
|
||||
-- 'truncateDigest' at the end.
|
||||
instance (ValidAlgo a, KnownNat n) => ValidAlgo ('Truncated n a) where
|
||||
type AlgoCtx ('Truncated n a) = AlgoCtx a
|
||||
initialize = initialize @a
|
||||
update = update @a
|
||||
finalize = truncateDigest @n . finalize @a
|
||||
|
||||
-- | Bytewise truncation of a 'Digest'.
|
||||
--
|
||||
-- When truncation length is greater than the length of the bytestring
|
||||
-- but less than twice the bytestring length, truncation splits the
|
||||
-- bytestring into a head part (truncation length) and tail part
|
||||
-- (leftover part), right-pads the leftovers with 0 to the truncation
|
||||
-- length, and combines the two strings bytewise with 'xor'.
|
||||
truncateDigest
|
||||
:: forall n a.(KnownNat n) => Digest a -> Digest ('Truncated n a)
|
||||
truncateDigest (Digest c) =
|
||||
Digest $ BS.pack $ map truncOutputByte [0.. n-1]
|
||||
where
|
||||
n = fromIntegral $ natVal (Proxy @n)
|
||||
|
||||
truncOutputByte :: Int -> Word8
|
||||
truncOutputByte i = foldl' (aux i) 0 [0 .. BS.length c - 1]
|
||||
|
||||
inputByte :: Int -> Word8
|
||||
inputByte j = BS.index c (fromIntegral j)
|
||||
|
||||
aux :: Int -> Word8 -> Int -> Word8
|
||||
aux i x j = if j `mod` fromIntegral n == fromIntegral i
|
||||
then xor x (inputByte $ fromIntegral j)
|
||||
else x
|
Loading…
Reference in New Issue
Block a user