def sign_rfc6979(self, msg, pv_key, hasher=None, canonical=False):
""" Signs a message hash according to RFC6979
Args:
msg (bytes) : the message hash to sign
pv_key (ecpy.keys.ECPrivateKey): key to use for signing
"""
hasher = self._hasher if hasher == None else hasher
field = pv_key.curve.field
V = None
for i in range(1, self.maxtries):
k, V = ecrand.rnd_rfc6979(msg, pv_key.d, field, self._hasher, V)
sig = self._do_sign(msg, pv_key, k)
if sig:
return sig
return None
def sign_rfc6979(self, msg, pv_key, hasher, canonical=False):
""" Signs a message hash according to RFC6979
Args:
msg (bytes) : the message hash to sign
pv_key (ecpy.keys.ECPrivateKey): key to use for signing
hasher (hashlib) : hasher conform to hashlib interface
"""
field = pv_key.curve.field
V = None
for i in range(1, self.maxtries):
k, V = ecrand.rnd_rfc6979(msg, pv_key.d, field, hasher, V)
sig = self._do_sign(msg, pv_key, k, canonical)
if sig:
return sig
return None