def sign_multisig(hash_hex, redeem_script, secret_keys):
assert len(redeem_script) > 0
m, pk_hexes = virtualchain.parse_multisig_redeemscript(redeem_script)
privs = {}
for sk in secret_keys:
pk = virtualchain.ecdsalib.ecdsa_private_key(sk).public_key().to_hex()
compressed_pubkey = keylib.key_formatting.compress(pk)
uncompressed_pubkey = keylib.key_formatting.decompress(pk)
privs[compressed_pubkey] = sk
privs[uncompressed_pubkey] = sk
used_keys, sigs = [],[]
for pk in pk_hexes:
if pk not in privs:
continue
if len(used_keys) == m:
break
assert pk not in used_keys, 'Tried to reuse key {}'.format(pk)
sk_hex = privs[pk]
used_keys.append(pk)
b64sig = virtualchain.ecdsalib.sign_digest(hash_hex, sk_hex)
sighex = binascii.hexlify(base64.b64decode(b64sig))
sigs.append(sighex)
assert len(used_keys) == m, 'Missing private keys (used {}, required {})'.format(len(used_keys), m)
return base64.b64encode(virtualchain.btc_script_serialize([None] + sigs + [redeem_script]))
def sign_multisig(hash_hex, redeem_script, secret_keys):
assert len(redeem_script) > 0
m, pk_hexes = virtualchain.parse_multisig_redeemscript(redeem_script)
privs = {}
for sk in secret_keys:
pk = virtualchain.ecdsalib.ecdsa_private_key(sk).public_key().to_hex()
compressed_pubkey = keylib.key_formatting.compress(pk)
uncompressed_pubkey = keylib.key_formatting.decompress(pk)
privs[compressed_pubkey] = sk
privs[uncompressed_pubkey] = sk
used_keys, sigs = [], []
for pk in pk_hexes:
if pk not in privs:
continue
if len(used_keys) == m:
break
assert pk not in used_keys, 'Tried to reuse key {}'.format(pk)
sk_hex = privs[pk]
used_keys.append(pk)
b64sig = virtualchain.ecdsalib.sign_digest(hash_hex, sk_hex)
sighex = binascii.hexlify(base64.b64decode(b64sig))
sigs.append(sighex)
assert len(
used_keys) == m, 'Missing private keys (used {}, required {})'.format(
len(used_keys), m)
return base64.b64encode(
virtualchain.btc_script_serialize([None] + sigs + [redeem_script]))
def sign(sk, plaintext):
"""
This returns a signature of the given plaintext with the given SK.
This is in the form of a p2pkh scriptSig
"""
privkey_hex = sk.to_hex()
hash_hex = binascii.hexlify(hashlib.sha256(plaintext).digest())
b64sig = virtualchain.ecdsalib.sign_digest(hash_hex, privkey_hex)
sighex = binascii.hexlify(base64.b64decode(b64sig))
pubkey_hex = sk.public_key().to_hex()
return base64.b64encode(virtualchain.btc_script_serialize([sighex, pubkey_hex]))