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tools: update keyctl and friends to use new cosi functions

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This commit is contained in:
matejcik 2018-05-28 17:59:33 +02:00
parent 0de0e1f3fb
commit 038e76071c
3 changed files with 19 additions and 23 deletions
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6
tools/binctl
View File

@ -8,7 +8,7 @@ import binascii
import pyblake2
from trezorlib import ed25519raw, ed25519cosi
from trezorlib import cosi
def format_sigmask(sigmask):
@ -285,11 +285,11 @@ def binopen(filename):
# check signatures against signing keys in the vendor header
if firmware.sigmask > 0:
pk = [vheader.vpub[i] for i in range(8) if firmware.sigmask & (1 << i)]
global_pk = ed25519cosi.combine_keys(pk)
global_pk = cosi.combine_keys(pk)
hdr = subdata[:IMAGE_HEADER_SIZE - IMAGE_SIG_SIZE] + IMAGE_SIG_SIZE * b'\x00'
digest = pyblake2.blake2s(hdr).digest()
try:
ed25519raw.checkvalid(firmware.sig, digest, global_pk)
cosi.verify(firmware.sig, digest, global_pk)
print('Firmware signature OK')
except:
print('Firmware signature INCORRECT')

26
tools/keyctl
View File

@ -3,7 +3,7 @@ import binascii
import struct
import click
import pyblake2
from trezorlib import ed25519raw, ed25519cosi
from trezorlib import cosi
indexmap = {
'bootloader': 0,
@ -40,30 +40,26 @@ def sign(index, filename, seckeys):
# compute header digest
digest = header_digest(index, filename)
# collect commits
pks, Rs = [], []
pks, nonces, Rs = [], [], []
for ctr, seckey in enumerate(seckeys):
sk = binascii.unhexlify(seckey)
pk = ed25519raw.publickey(sk)
_, R = ed25519cosi.get_nonce(sk, digest, ctr)
pk = cosi.pubkey_from_privkey(sk)
r, R = cosi.get_nonce(sk, digest, ctr)
pks.append(pk)
nonces.append(r)
Rs.append(R)
# compute global commit
global_pk = ed25519cosi.combine_keys(pks)
global_R = ed25519cosi.combine_keys(Rs)
global_pk = cosi.combine_keys(pks)
global_R = cosi.combine_keys(Rs)
# collect signatures
sigs = []
for ctr, seckey in enumerate(seckeys):
for seckey, nonce in zip(seckeys, nonces):
sk = binascii.unhexlify(seckey)
r, _ = ed25519cosi.get_nonce(sk, digest, ctr)
h = ed25519raw.H(sk)
b = ed25519raw.b
a = 2 ** (b - 2) + sum(2 ** i * ed25519raw.bit(h, i) for i in range(3, b - 2))
S = (r + ed25519raw.Hint(global_R + global_pk + digest) * a) % ed25519raw.l
sig = ed25519raw.encodeint(S)
sig = cosi.sign_with_privkey(digest, sk, global_pk, nonce, global_R)
sigs.append(sig)
# compute global signature
sig = ed25519cosi.combine_sig(global_R, sigs)
ed25519raw.checkvalid(sig, digest, global_pk)
sig = cosi.combine_sig(global_R, sigs)
cosi.verify(sig, digest, global_pk)
print(binascii.hexlify(sig).decode())

10
tools/keyctl-coordinator
View File

@ -5,7 +5,7 @@ import click
import pyblake2
import Pyro4
import serpent
from trezorlib import ed25519raw, ed25519cosi
from trezorlib import cosi
PORT = 5001
indexmap = {
@ -58,8 +58,8 @@ def sign(index, filename, participants):
pks.append(pk)
Rs.append(R)
# compute global commit
global_pk = ed25519cosi.combine_keys(pks)
global_R = ed25519cosi.combine_keys(Rs)
global_pk = cosi.combine_keys(pks)
global_R = cosi.combine_keys(Rs)
# collect signatures
sigs = []
for p in proxy:
@ -67,8 +67,8 @@ def sign(index, filename, participants):
sig = serpent.tobytes(sig)
sigs.append(sig)
# compute global signature
sig = ed25519cosi.combine_sig(global_R, sigs)
ed25519raw.checkvalid(sig, digest, global_pk)
sig = cosi.combine_sig(global_R, sigs)
cosi.verify(sig, digest, global_pk)
print(binascii.hexlify(sig).decode())