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zcash-test-vectors
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f4jumble: updates for large UAs/UVKs. 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2021-08-30 19:16:27 +01:00
parent 87e0a6b57c
commit 71e2a355c4
1 changed files with 15 additions and 8 deletions
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21
f4jumble.py
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@ -8,17 +8,22 @@ from pyblake2 import blake2b
from tv_output import render_args, render_tv from tv_output import render_args, render_tv
from tv_rand import Rand from tv_rand import Rand
from utils import i2leosp
# Maximum output length of BLAKE2b # Maximum output length of BLAKE2b
l_H = 64 l_H = 64
assert 8*l_H == 512 assert 8*l_H == 512
MIN_l_M = 48
MAX_l_M = 4194368
assert MAX_l_M == 65537*l_H
def instantiate(l_L, l_R): def instantiate(l_L, l_R):
def H(i, u): def H(i, u):
digest = blake2b( digest = blake2b(
digest_size=l_L, digest_size=l_L,
person=b'UA_F4Jumble_H_' + bytes([i, 0]), person=b'UA_F4Jumble_H' + bytes([i, 0, 0]),
) )
digest.update(u) digest.update(u)
return digest.digest() return digest.digest()
@ -27,7 +32,7 @@ def instantiate(l_L, l_R):
def inner(j): def inner(j):
digest = blake2b( digest = blake2b(
digest_size=l_H, digest_size=l_H,
person=b'UA_F4Jumble_G_' + bytes([i, j]), person=b'UA_F4Jumble_G' + bytes([i]) + i2leosp(16, j),
) )
digest.update(u) digest.update(u)
return digest.digest() return digest.digest()
@ -41,7 +46,7 @@ def xor(x, y):
def f4jumble(M): def f4jumble(M):
l_M = len(M) l_M = len(M)
assert 48 <= l_M and l_M <= 16448 assert MIN_l_M <= l_M and l_M <= MAX_l_M
l_L = min([l_H, l_M//2]) l_L = min([l_H, l_M//2])
l_R = l_M - l_L l_R = l_M - l_L
@ -58,7 +63,7 @@ def f4jumble(M):
def f4jumble_inv(M): def f4jumble_inv(M):
l_M = len(M) l_M = len(M)
assert 48 <= l_M and l_M <= 16448 assert MIN_l_M <= l_M and l_M <= MAX_l_M
l_L = min([l_H, l_M//2]) l_L = min([l_H, l_M//2])
l_R = l_M - l_L l_R = l_M - l_L
@ -89,14 +94,16 @@ def main():
test_vectors = [] test_vectors = []
# Generate test vectors with various lengths: # Generate test vectors with various lengths:
for l_M in [ for l_M in [
48, MIN_l_M,
l_H, l_H,
2*l_H, 2*l_H,
2*l_H + 1, 2*l_H + 1,
3*l_H, 3*l_H,
3*l_H + 1, 3*l_H + 1,
(rand.u32() % 16400) + 48, 257*l_H,
16448, 257*l_H + 1,
(rand.u32() % (MAX_l_M - MIN_l_M)) + MIN_l_M,
MAX_l_M,
]: ]:
M = rand.b(l_M) M = rand.b(l_M)
jumbled = f4jumble(M) jumbled = f4jumble(M)