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allow use of custom nonce in ecdsa_sign #11

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merged 1 commit into from
Jul 30, 2016
Merged

allow use of custom nonce in ecdsa_sign #11

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9 changes: 6 additions & 3 deletions secp256k1/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -380,12 +380,15 @@ def tweak_mul(self, scalar):
"""
return _tweak_private(self, lib.secp256k1_ec_privkey_tweak_mul, scalar)

def ecdsa_sign(self, msg, raw=False, digest=hashlib.sha256):
def ecdsa_sign(self, msg, raw=False, digest=hashlib.sha256, custom_nonce=None):
msg32 = _hash32(msg, raw, digest)
raw_sig = ffi.new('secp256k1_ecdsa_signature *')

nonce_fn = ffi.NULL
nonce_data = ffi.NULL
if custom_nonce:
nonce_fn, nonce_data = custom_nonce
signed = lib.secp256k1_ecdsa_sign(
self.ctx, raw_sig, msg32, self.private_key, ffi.NULL, ffi.NULL)
self.ctx, raw_sig, msg32, self.private_key, nonce_fn, nonce_data)
assert signed == 1

return raw_sig
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