mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-11-10 18:21:34 +03:00
478 lines
13 KiB
Plaintext
478 lines
13 KiB
Plaintext
/- *ring
|
|
:: ring signatures over the edwards curve
|
|
::
|
|
|%
|
|
:: +raw is the raw internal ring signature implementation. +raw does not deal
|
|
:: with urbit ship identities or urbit nouns and is low level. It only deals
|
|
:: with ed25519 keys and message digests.
|
|
::
|
|
:: This raw interface is vaguely modeled on the haskell aos-signature package,
|
|
:: but is written in terms of ed25519 primitives instead of general ECC and
|
|
:: changes how linkage tags are computed so that how linkage occurs is a
|
|
:: client decision instead of hard coding the set of public keys as the
|
|
:: linkage scope.
|
|
::
|
|
++ raw
|
|
|%
|
|
:: +generate-public-linkage: generate public linkage information
|
|
::
|
|
++ generate-public-linkage
|
|
|= link-scope=@
|
|
^- [data=@ h=@udpoint]
|
|
::
|
|
=/ data=@ (mod link-scope l:ed:crypto)
|
|
=/ h=@udpoint (scalarmult-base:ed:crypto data)
|
|
[data h]
|
|
:: +generate-linkage: linkage information from scope and private key
|
|
::
|
|
:: data: deterministically picked data point based off scope
|
|
:: h: h = [data] * g
|
|
:: y: y = [x] * h
|
|
++ generate-linkage
|
|
|= [link-scope=(unit @) my-private-key=@]
|
|
^- (unit [data=@ h=@udpoint y=@udpoint])
|
|
::
|
|
?~ link-scope
|
|
~
|
|
::
|
|
=+ [data=@ h=@udpoint]=(generate-public-linkage u.link-scope)
|
|
=/ y=@udpoint (scalarmult:ed:crypto my-private-key h)
|
|
[~ data h y]
|
|
:: +generate-challenge: generate challenge from a given message
|
|
::
|
|
:: When :link-scope is ~ (ie, we're not building a linked ring signature),
|
|
:: calculates just the hash of `[message g]`. Otherwise, weaves the
|
|
:: linkage state into the challenge.
|
|
::
|
|
++ generate-challenge
|
|
|= $: :: common to both linked and unlinked
|
|
message=@
|
|
g=@udpoint
|
|
:: high level universal state
|
|
::
|
|
link-state=(unit [data=@ h=@udpoint y=@udpoint])
|
|
:: point to include in challenge when link-state isn't ~
|
|
::
|
|
h=(unit @udpoint)
|
|
==
|
|
^- @
|
|
:: concatenate and reduce our message down to a 512-bit hash
|
|
=/ concatenated
|
|
?~ link-state
|
|
(shal 96 (can 3 ~[[64 message] [32 g]]))
|
|
::
|
|
%+ shal 192
|
|
%+ can 3
|
|
:~ [64 message]
|
|
[32 g]
|
|
[32 data.u.link-state]
|
|
[32 y.u.link-state]
|
|
[32 (need h)]
|
|
==
|
|
::
|
|
(mod concatenated l:ed:crypto)
|
|
:: +generate-challenges: generates the full list of challenges
|
|
::
|
|
++ generate-challenges
|
|
|= $: link-state=(unit [data=@ h=@udpoint y=@udpoint])
|
|
message=@
|
|
public-keys=(list @udpoint)
|
|
ss=(list @)
|
|
::
|
|
prev-k=@u
|
|
prev-s=@
|
|
prev-ch=@
|
|
challenges=(list @)
|
|
==
|
|
^- (list @)
|
|
::
|
|
=/ gs=@udpoint
|
|
%- add-scalarmult-scalarmult-base:ed:crypto :*
|
|
prev-ch
|
|
(snag prev-k public-keys)
|
|
prev-s
|
|
==
|
|
::
|
|
=/ hs=(unit @udpoint)
|
|
?~ link-state
|
|
~
|
|
::
|
|
:- ~
|
|
%- add-double-scalarmult:ed:crypto :*
|
|
prev-s
|
|
h.u.link-state
|
|
prev-ch
|
|
y.u.link-state
|
|
==
|
|
::
|
|
=/ ch=@
|
|
(generate-challenge message gs link-state hs)
|
|
::
|
|
?~ ss
|
|
[ch challenges]
|
|
::
|
|
%_ $
|
|
prev-k (mod (add prev-k 1) (lent public-keys))
|
|
prev-s i.ss
|
|
prev-ch ch
|
|
ss t.ss
|
|
challenges [ch challenges]
|
|
==
|
|
:: +scalarmult-h: maybe multiply u by h in linkage
|
|
::
|
|
:: Since linkage tags are optional, we need to be able to just do the math
|
|
:: in case :linkage is set and fall through otherwise. +scalarmult-h is
|
|
:: used to generate the (unit point) consumed by +generate-challenge.
|
|
::
|
|
++ scalarmult-h
|
|
|= [u=@ linkage=(unit [data=@ h=@udpoint y=@udpoint])]
|
|
^- (unit @udpoint)
|
|
?~ linkage
|
|
~
|
|
[~ (scalarmult:ed:crypto u h.u.linkage)]
|
|
:: +reorder: reorders a list so the ith element is first
|
|
::
|
|
++ reorder
|
|
|* [i=@ l=(list)]
|
|
%+ weld
|
|
(slag i l)
|
|
(scag i l)
|
|
:: +sign: creates a ring signature on an ed25519 curve
|
|
::
|
|
++ sign
|
|
|= $: message=@
|
|
link-scope=(unit @)
|
|
::
|
|
anonymity-set=(set @udpoint)
|
|
my-public-key=@udpoint
|
|
my-private-key=@udscalar
|
|
::
|
|
eny=@uvJ
|
|
==
|
|
^- raw-ring-signature
|
|
|^ :: k: our public-key's position in :anonymity-list
|
|
::
|
|
=/ k=@u
|
|
~| [%couldnt-find my-public-key in=anonymity-list]
|
|
(need (find [my-public-key ~] anonymity-list))
|
|
:: Generate linkage information if given
|
|
::
|
|
=/ linkage=(unit [data=@ h=@udpoint y=@udpoint])
|
|
(generate-linkage link-scope my-private-key)
|
|
:: initialize our random number generator from entropy
|
|
::
|
|
=+ rand=~(. og eny)
|
|
:: generate the random s values used in the ring
|
|
::
|
|
=^ random-s-values=(list @) rand
|
|
=| count=@
|
|
=| random-s-values=(list @)
|
|
|-
|
|
?: =(count (sub participants 1))
|
|
[random-s-values rand]
|
|
::
|
|
=^ v=@ rand (rads:rand l:ed:crypto)
|
|
$(count (add 1 count), random-s-values [v random-s-values])
|
|
::
|
|
?> ?=(^ random-s-values)
|
|
=/ sk1=@ i.random-s-values
|
|
=/ sk2-to-prev-sk=(list @) t.random-s-values
|
|
:: Pick a random :u
|
|
::
|
|
=^ u=@ rand
|
|
(rads:rand l:ed:crypto)
|
|
:: Compute challenge at k + 1
|
|
::
|
|
=/ chk1=@
|
|
%- generate-challenge :*
|
|
message
|
|
(scalarmult-base:ed:crypto u)
|
|
linkage
|
|
(scalarmult-h u linkage)
|
|
==
|
|
:: Generate challenges for [ck, ..., c1, c0, ... ck + 2, ck + 1]
|
|
::
|
|
=/ reversed-chk-to-chk1=(list @)
|
|
%- generate-challenges :*
|
|
linkage
|
|
message
|
|
anonymity-list
|
|
sk2-to-prev-sk
|
|
::
|
|
(mod (add k 1) participants)
|
|
sk1
|
|
chk1
|
|
[chk1 ~]
|
|
==
|
|
=/ chk=@ (head reversed-chk-to-chk1)
|
|
:: Compute s = u - x * c mod n
|
|
::
|
|
=/ sk=@ (~(dif fo l:ed:crypto) u (mul my-private-key chk))
|
|
::
|
|
=/ ordered-challenges=(list @)
|
|
(order-challenges k (flop reversed-chk-to-chk1))
|
|
::
|
|
=/ ordered-ss=(list @) (order-ss k [sk sk1 sk2-to-prev-sk])
|
|
=/ ch0 (head ordered-challenges)
|
|
::
|
|
[ch0 ordered-ss ?~(linkage ~ `y.u.linkage)]
|
|
::
|
|
++ anonymity-list
|
|
~(tap in anonymity-set)
|
|
::
|
|
++ participants
|
|
(lent anonymity-list)
|
|
::
|
|
++ order-challenges
|
|
|= [k=@ ch=(list @)]
|
|
(reorder (sub participants (add k 1)) ch)
|
|
::
|
|
++ order-ss
|
|
|= [k=@ sk-to-prev-sk=(list @)]
|
|
(reorder (sub participants k) sk-to-prev-sk)
|
|
--
|
|
:: +verify: verify signature
|
|
::
|
|
++ verify
|
|
|= $: message=@
|
|
link-scope=(unit @)
|
|
::
|
|
anonymity-set=(set @udpoint)
|
|
signature=raw-ring-signature
|
|
==
|
|
^- ?
|
|
:: if there's a linkage scope but no tag, fail
|
|
::
|
|
?: &(?=(^ link-scope) ?=(~ y.signature))
|
|
%.n
|
|
:: if there's no linkage scope but a tag, fail
|
|
::
|
|
?: &(?=(~ link-scope) ?=(^ y.signature))
|
|
%.n
|
|
:: vice versa.
|
|
::
|
|
:: decompose the signature into [s0 s1 s2....]
|
|
::
|
|
?> ?=([@ @ *] s.signature)
|
|
=/ s0=@ i.s.signature
|
|
=/ s1=@ i.t.s.signature
|
|
=/ s2-to-end=(list @) t.t.s.signature
|
|
:: anonymity-list: set of public keys listified in ring order
|
|
::
|
|
=/ anonymity-list=(list @udpoint)
|
|
~(tap in anonymity-set)
|
|
:: participants: length of :anonymity-list
|
|
::
|
|
=/ participants=@u
|
|
(lent anonymity-list)
|
|
::
|
|
=/ z0p=@udpoint
|
|
%- add-scalarmult-scalarmult-base:ed:crypto :*
|
|
ch0.signature
|
|
(head anonymity-list)
|
|
s0
|
|
==
|
|
:: generate the linkage using public data, and the y point from the
|
|
:: signature
|
|
::
|
|
=/ linkage=(unit [data=@ h=@udpoint y=@udpoint])
|
|
?~ link-scope
|
|
~
|
|
=+ [data=@ h=@udpoint]=(generate-public-linkage u.link-scope)
|
|
:- ~
|
|
[data h (need y.signature)]
|
|
::
|
|
=/ z0pp=(unit @udpoint)
|
|
?~ linkage
|
|
~
|
|
:- ~
|
|
%- add-double-scalarmult:ed:crypto :*
|
|
s0
|
|
h.u.linkage
|
|
ch0.signature
|
|
y.u.linkage
|
|
==
|
|
:: initial challenge
|
|
::
|
|
=/ ch1=@
|
|
(generate-challenge message z0p linkage z0pp)
|
|
::
|
|
=/ challenges
|
|
%- generate-challenges :*
|
|
linkage
|
|
message
|
|
anonymity-list
|
|
s2-to-end
|
|
::
|
|
(mod 1 participants)
|
|
s1
|
|
ch1
|
|
[ch1 ~]
|
|
==
|
|
::
|
|
=(ch0.signature (head challenges))
|
|
--
|
|
:: +detail: details about getting keys from Azimuth
|
|
::
|
|
++ detail
|
|
|%
|
|
:: +seed-to-private-key-scalar: keyfile form to scalar we can multiply with
|
|
::
|
|
++ seed-to-private-key-scalar
|
|
|= sk=@I ^- @udscalar
|
|
?: (gth (met 3 sk) 32) !!
|
|
=+ h=(shal (rsh [0 3] b:ed:crypto) sk)
|
|
%+ add
|
|
(bex (sub b:ed:crypto 2))
|
|
(lsh [0 3] (cut 0 [3 (sub b:ed:crypto 5)] h))
|
|
:: +get-public-key-from-pass: decode the raw @ public key structure
|
|
::
|
|
++ get-public-key-from-pass
|
|
|= a=pass
|
|
^- [@ @]
|
|
=+ [mag=(end 3 a) bod=(rsh 3 a)]
|
|
~| %not-crub-pubkey ?> =('b' mag)
|
|
[cry=(rsh 8 bod) sgn=(end 8 bod)]
|
|
::
|
|
::
|
|
++ get-private-key-from-ring
|
|
|= a=ring
|
|
^- [@ @]
|
|
=+ [mag=(end 3 a) bod=(rsh 3 a)]
|
|
~| %not-crub-seckey ?> =('B' mag)
|
|
=+ [c=(rsh 8 bod) s=(end 8 bod)]
|
|
:: todo: do we puck here?
|
|
[c s]
|
|
:: +ship-life-to-pubid: fetches public key information from jael
|
|
::
|
|
++ ship-life-to-pubid
|
|
|= [our=@p now=@da ship=@p =life]
|
|
^- @udpoint
|
|
::
|
|
=/ d=[=^life =pass]
|
|
=/ scry-path=path
|
|
:~ %k
|
|
(scot %p our)
|
|
(scot %da now)
|
|
(scot %p ship)
|
|
(scot %ud life)
|
|
==
|
|
.^([^life pass] scry-path)
|
|
:: we have the deed which has pass, which is several numbers +cat-ed
|
|
:: together; pull out the keys
|
|
::
|
|
=/ x=[crypt=@ auth=@] (get-public-key-from-pass pass.d)
|
|
::
|
|
`@udpoint`auth.x
|
|
::
|
|
++ build-signing-participants
|
|
|= [our=@p now=@da invited=(list @p)]
|
|
^- [(set [@p life]) (set @udpoint)]
|
|
::
|
|
=| participants=(set [@p life])
|
|
=| keys=(set @udpoint)
|
|
::
|
|
|-
|
|
?~ invited
|
|
[participants keys]
|
|
::
|
|
=/ =life
|
|
.^(life k+/(scot %p our)/life/(scot %da now)/(scot %p i.invited))
|
|
::
|
|
?: =(life 0)
|
|
$(invited t.invited)
|
|
::
|
|
=/ pubkey=@udpoint (ship-life-to-pubid our now i.invited life)
|
|
::
|
|
=. participants (~(put in participants) [i.invited life])
|
|
=. keys (~(put in keys) pubkey)
|
|
::
|
|
$(invited t.invited)
|
|
::
|
|
::
|
|
++ build-verifying-participants
|
|
|= [our=@p now=@da invited=(list [ship=@p =life])]
|
|
^- (set @udpoint)
|
|
::
|
|
=| keys=(set @udpoint)
|
|
::
|
|
|-
|
|
?~ invited
|
|
keys
|
|
::
|
|
=/ pubkey=@udpoint
|
|
(ship-life-to-pubid our now ship.i.invited life.i.invited)
|
|
=. keys
|
|
(~(put in keys) pubkey)
|
|
::
|
|
$(invited t.invited)
|
|
--
|
|
--
|
|
:: public interface
|
|
::
|
|
|%
|
|
:: +sign: ring-signs a message using the current ship
|
|
::
|
|
++ sign
|
|
|= $: our=@p
|
|
now=@da
|
|
eny=@uvJ
|
|
::
|
|
message=*
|
|
link-scope=(unit *)
|
|
anonymity-set=(set @p)
|
|
==
|
|
^- ring-signature
|
|
:: if our is not in @p, we must be in @p.
|
|
::
|
|
=. anonymity-set (~(put in anonymity-set) our)
|
|
::
|
|
=/ msg-hash=@ (shaz (jam message))
|
|
=/ link-hash=(unit @) (bind link-scope |=(a=* (shaz (jam a))))
|
|
:: get everyone's public keys
|
|
::
|
|
=/ p=[participants=(set [ship=@p =life]) keys=(set @udpoint)]
|
|
(build-signing-participants:detail our now ~(tap in anonymity-set))
|
|
:: get our ships' current life
|
|
::
|
|
=/ our-life=life
|
|
.^(life %k /(scot %p our)/life/(scot %da now)/(scot %p our))
|
|
:: get our ships' secret keyfile ring
|
|
::
|
|
=/ secret-ring=ring
|
|
.^(ring %k /(scot %p our)/vein/(scot %da now)/(scot %ud our-life))
|
|
:: fetch the encoded auth seed from the ring
|
|
::
|
|
=/ secret-auth-seed=@
|
|
+:(get-private-key-from-ring:detail secret-ring)
|
|
:: get our ships' public key
|
|
::
|
|
=/ public-key=@udpoint
|
|
(ship-life-to-pubid:detail our now our our-life)
|
|
::
|
|
:- participants.p
|
|
:- link-scope
|
|
%- sign:raw :*
|
|
msg-hash
|
|
link-hash
|
|
keys.p
|
|
public-key
|
|
(seed-to-private-key-scalar:detail secret-auth-seed)
|
|
eny
|
|
==
|
|
:: +verify: verifies a message against a ring signature
|
|
::
|
|
++ verify
|
|
|= [our=@p now=@da message=* =ring-signature]
|
|
^- ?
|
|
::
|
|
=/ keys=(set @udpoint)
|
|
%^ build-verifying-participants:detail our now
|
|
~(tap in participants.ring-signature)
|
|
::
|
|
=/ msg-hash=@ (shaz (jam message))
|
|
=/ link-hash=(unit @) (bind link-scope.ring-signature |=(a=* (shaz (jam a))))
|
|
::
|
|
(verify:raw msg-hash link-hash keys raw.ring-signature)
|
|
--
|