logos-storage/nim-poseidon2
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Co-Authored-By: Dmitriy Ryajov <dryajov@gmail.com>
This commit is contained in:
Mark Spanbroek 2023-11-13 11:34:19 +01:00 committed by markspanbroek
parent f5835d5fdc
commit 9c1d18e1a2
1 changed files with 6 additions and 10 deletions
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16
poseidon2.nim
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@ -10,7 +10,7 @@ export toBytes
# the Poseidon2 permutation (mutable, in-place version)
proc permInplace*(x, y, z : var F) =
linearLayer(x, y, z);
linearLayer(x, y, z)
for j in 0..3:
externalRound(j, x, y, z)
for j in 0..55:
@ -26,12 +26,8 @@ func perm*(xyz: S) : S =
#-------------------------------------------------------------------------------
# sponge with rate=1 (capacity=2)
# sponge with rate=1 (capacity=2)
func spongeWithRate1*(xs: openArray[F]) : F =
let a = low(xs)
let b = high(xs)
let n = b-a+1
var s0 : F = zero
var s1 : F = zero
var s2 : F = toF(0x0301) ; s2 += twoToThe64 # domain separation IV := (2^64 + 256*t + r)
@ -41,16 +37,16 @@ func spongeWithRate1*(xs: openArray[F]) : F =
permInplace(s0,s1,s2)
# padding
s0 += one;
s0 += one
permInplace(s0,s1,s2)
return s0
# sponge with rate=2 (capacity=1)
# sponge with rate=2 (capacity=1)
func spongeWithRate2*(xs: openArray[F]) : F =
let a = low(xs)
let b = high(xs)
let n = b-a+1
let halfn : int = n div 2
let halfn : int = n div 2
var s0 : F = zero
var s1 : F = zero
@ -70,7 +66,7 @@ func spongeWithRate2*(xs: openArray[F]) : F =
s0 += xs[b]
s1 += one
permInplace(s0,s1,s2)
permInplace(s0,s1,s2)
return s0
#-------------------------------------------------------------------------------