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73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
////////////////////////////////////////////////////////////////
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// Copyright 2016 Galois, Inc. All Rights Reserved
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//
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// Authors:
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// Aaron Tomb : atomb@galois.com
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// Nathan Collins : conathan@galois.com
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// Joey Dodds : jdodds@galois.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License").
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// You may not use this file except in compliance with the License.
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// A copy of the License is located at
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//
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// http://aws.amazon.com/apache2.0
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//
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// or in the "license" file accompanying this file. This file is distributed
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// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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// express or implied. See the License for the specific language governing
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// permissions and limitations under the License.
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//
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////////////////////////////////////////////////////////////////
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module HMAC where
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import SHA256
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//////// Functional version ////////
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hmacSHA256 : {pwBytes, msgBytes}
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(fin pwBytes, fin msgBytes
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, 32 >= width msgBytes
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, 64 >= width (8*pwBytes)
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, 64 >= width (8 * (64 + msgBytes))
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) => [pwBytes][8] -> [msgBytes][8] -> [256]
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hmacSHA256 = hmac `{blockLength=64} SHA256 SHA256 SHA256
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kinit : { pwBytes, blockLength, digest }
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( fin pwBytes, fin blockLength, fin digest )
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=> ([pwBytes][8] -> [8*digest])
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-> [pwBytes][8]
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-> [blockLength][8]
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kinit hash key =
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if `pwBytes > (`blockLength : [max (width pwBytes) (width blockLength)])
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then take `{blockLength} (split (hash key) # (zero : [blockLength][8]))
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else take `{blockLength} (key # (zero : [blockLength][8]))
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// Due to limitations of the type system we must accept two
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// separate arguments (both aledgedly the same) for two
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// separate length inputs.
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hmac : { msgBytes, pwBytes, digest, blockLength }
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( fin pwBytes, fin digest, fin blockLength )
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=> ([blockLength + msgBytes][8] -> [8*digest])
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-> ([blockLength + digest][8] -> [8*digest])
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-> ([pwBytes][8] -> [8*digest])
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-> [pwBytes][8]
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-> [msgBytes][8]
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-> [digest*8]
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hmac hash hash2 hash3 key message = hash2 (okey # internal)
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where
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ks : [blockLength][8]
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ks = kinit hash3 key
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okey = [k ^ 0x5C | k <- ks]
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ikey = [k ^ 0x36 | k <- ks]
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internal = split (hash (ikey # message))
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