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Migrate to zokrates v0.6 #13

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Migrate to zokrates v0.6 #13

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856abce
Upgrades merkle root zok pragram
Jan 11, 2021
3e66e08
Upgrades validate zok program
Jan 11, 2021
0e3d463
updates input preprocessing and zok helper for upgrade compatibility
Jan 11, 2021
9f65fc2
upgrades getHexLength to new zok version
Jan 11, 2021
ce30c0d
Upgrades merkle inclusion proof
Jan 11, 2021
38c6098
reverts in/outputs to field elements for reduced gas verification costs
Jan 20, 2021
b281fd3
updates validate to use embedded sha256
Feb 1, 2021
d3ff900
updates to embedded sha256
Feb 1, 2021
b782b62
fixes merkle root import
Feb 1, 2021
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46 changes: 16 additions & 30 deletions generate_zokrates_files/generate_merkle_proof_validation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,48 +3,34 @@

def generate_create_hash():
return '''
def create_hash(field[5] preimage) -> (field[256]):
a = unpack128(preimage[0])
b = unpack128(preimage[1])
c = unpack128(preimage[2])
d = unpack128(preimage[3])
e = unpack128(preimage[4])

field[256] preimage1 = [...a, ...b]
field[256] preimage2 = [...c, ...d]
field[256] preimage3 = [...[...e, 1], ...[0; 127]]
field[256] dummy = [...[0; 246], ...[1, 0, 1, 0, 0, 0, 0, 0, 0, 0]] //second array indicates length of preimage = 640bit

intermediary = sha256for1024(preimage1, preimage2, preimage3, dummy)

return sha256only(intermediary)
def create_hash(bool[640] preimage) -> (bool[256]):
bool[256] intermediary = sha256for1024(preimage[0..256], preimage[256..512], [...preimage[512..640], true, ...[false; 127]], [...[false; 246], true, false, true, ...[false; 7]])
return sha256only(intermediary)

'''


def generate_merkle_proof_validation_code(number_leafs):
layers = math.ceil(math.log(number_leafs, 2))
code = []

code.append('import "hashes/pedersen/512bit.zok" as pedersenhash')
code.append('import "utils/pack/pack128.zok" as pack128\n')
code.append('import "utils/pack/unpack128.zok" as unpack128\n')
code.append('import "hashes/sha256/1024bit.zok" as sha256for1024\n')
code.append('import "../sha256only.zok" as sha256only')
code.append('import "hashes/sha256/embed/1024bit.zok" as sha256for1024\n')
code.append('import "hashes/sha256/embed/256bitPadded.zok" as sha256only\n')
code.append('import "utils/pack/bool/pack128.zok" as pack_128_bool_to_field\n')
code.append('import "utils/pack/u32/pack128.zok" as pack_u32_4_to_field\n')
code.append('import "utils/pack/bool/unpack128.zok" as unpack_field_to_128_bool\n')
code.append('import "utils/casts/bool_128_to_u32_4.zok" as bool_128_to_u32_4\n')

code.append(generate_create_hash())

code.append('def main(field[5] preimage, private field[{layers}][256] path, private field[{layers}] lr) -> (field[4]):'.format(layers=layers))
code.append('\tunpacked_proof_header = create_hash(preimage)')
code.append('\tfield[256] layer0 = if lr[0] == 0 then pedersenhash([...path[0], ...unpacked_proof_header]) else pedersenhash([...unpacked_proof_header, ...path[0]]) fi')
code.append(generate_create_hash())
code.append('def main(field[5] preimage_field, private u32[{layers}][8] path, private field[{layers}] lr) -> (field[2][2]):'.format(layers=layers))
code.append('\tbool[640] preimage = [...unpack_field_to_128_bool(preimage_field[0]), ...unpack_field_to_128_bool(preimage_field[1]), ...unpack_field_to_128_bool(preimage_field[2]), ...unpack_field_to_128_bool(preimage_field[3]), ...unpack_field_to_128_bool(preimage_field[4])]')
code.append('\tbool[256] proof_header = create_hash(preimage)')
code.append('\tu32[8] layer0 = if lr[0] == 0 then pedersenhash([...path[0], ...bool_128_to_u32_4(proof_header[0..128]), ...bool_128_to_u32_4(proof_header[128..256])]) else pedersenhash([...bool_128_to_u32_4(proof_header[0..128]), ...bool_128_to_u32_4(proof_header[128..256]), ...path[0]]) fi')

for i in range(1, layers):
code.append('\tfield[256] layer{i} = if lr[{i}] == 0 then pedersenhash([...path[{i}], ...layer{preceeding}]) else pedersenhash([...layer{preceeding}, ...path[{i}]]) fi'.format(i=i, preceeding= i-1))

code.append('\tres0 = pack128(layer{layers}[0..128])'.format(layers=layers-1))
code.append('\tres1 = pack128(layer{layers}[128..256])'.format(layers=layers-1))
code.append('\tu32[8] layer{i} = if lr[{i}] == 0 then pedersenhash([...path[{i}], ...layer{preceeding}]) else pedersenhash([...layer{preceeding}, ...path[{i}]]) fi'.format(i=i, preceeding= i-1))

code.append('\tfield[2] proof_header = [pack128(unpacked_proof_header[0..128]), pack128(unpacked_proof_header[128..256])]')
code.append('\treturn [...proof_header, res0, res1]')
code.append('\treturn [[pack_128_bool_to_field(proof_header[0..128]), pack_128_bool_to_field(proof_header[128..256])], [pack_u32_4_to_field(layer{layers}[0..4]), pack_u32_4_to_field(layer{layers}[4..8])]]'.format(layers=layers-1))

return '\n'.join(code)
16 changes: 8 additions & 8 deletions generate_zokrates_files/generate_root_computation.py
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Original file line number Diff line number Diff line change
@@ -1,11 +1,12 @@

import math


def generate_compute_root(number_leafs):
if number_leafs > 2:
output = '\tfield[{len}][256] layer{layer} = [\n'.format(len=math.ceil(number_leafs/2), layer=(math.ceil(math.log(number_leafs,2))-1))
output = '\tbool[{len}][256] layer{layer} = [\n'.format(len=math.ceil(number_leafs/2), layer=(math.ceil(math.log(number_leafs,2))-1))
else:
output = '\tfield[256] layer{layer} = '.format(layer=(math.ceil(math.log(number_leafs,2))-1))
output = '\tbool[256] layer{layer} = '.format(layer=(math.ceil(math.log(number_leafs,2))-1))
for i in range(0, number_leafs-2, 2):
output = output + '\t\tpedersenhash([...layer{layer}[{a}], ...layer{layer}[{b}]]),\n'.format(a=i, b=i+1, layer=math.ceil(math.log(number_leafs,2)))
output = output + '\t\tpedersenhash([...layer{layer}[{a}], ...layer{layer}[{b}]])\n'.format(a=number_leafs-2 if number_leafs % 2 == 0 else number_leafs-1, b=number_leafs-1, layer=math.ceil(math.log(number_leafs,2)))
Expand All @@ -19,10 +20,9 @@ def generate_compute_root(number_leafs):


def generate_root_code(number_leafs):
output = ('import "hashes/pedersen/512bit.zok" as pedersenhash\nimport "utils/pack/unpack128.zok" as unpack128\nimport "utils/pack/pack128.zok" as pack128\n' +
'def main(field[{number_leafs}][256] layer{layer}) -> (field[2]):\n'.format(number_leafs=number_leafs,layer=math.ceil(math.log(number_leafs,2))) +
output = ('import "hashes/pedersen/512bitBool.zok" as pedersenhash\n' +
'import "utils/pack/bool/pack128.zok" as bool_128_to_field\n' +
'def main(bool[{number_leafs}][256] layer{layer}) -> (field[2]):\n'.format(number_leafs=number_leafs,layer=math.ceil(math.log(number_leafs,2))) +
generate_compute_root(number_leafs) +
'\tfield res0 = pack128(layer0[0..128])\n' +
'\tfield res1 = pack128(layer0[128..256])\n' +
'\treturn [res0, res1]')
return output
'\treturn [bool_128_to_field(layer0[0..128]), bool_128_to_field(layer0[128..256])]')
return output
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