def _decode_signature(self, signature):
"""
Decode the internal fields of the base64-encoded signature.
"""
sig = a2b_base64(signature)
if len(sig) != 65:
raise EncodingError("Wrong length, expected 65")
# split into the parts.
first = byte2int(sig)
r = from_bytes_32(sig[1:33])
s = from_bytes_32(sig[33:33+32])
# first byte encodes a bits we need to know about the point used in signature
if not (27 <= first < 35):
raise EncodingError("First byte out of range")
# NOTE: The first byte encodes the "recovery id", or "recid" which is a 3-bit values
# which selects compressed/not-compressed and one of 4 possible public pairs.
#
first -= 27
is_compressed = bool(first & 0x4)
return is_compressed, (first & 0x3), r, s
def _decode_signature(self, signature):
"""
Decode the internal fields of the base64-encoded signature.
"""
sig = a2b_base64(signature)
if len(sig) != 65:
raise EncodingError("Wrong length, expected 65")
# split into the parts.
first = byte2int(sig)
r = from_bytes_32(sig[1:33])
s = from_bytes_32(sig[33:33+32])
# first byte encodes a bits we need to know about the point used in signature
if not (27 <= first < 35):
raise EncodingError("First byte out of range")
# NOTE: The first byte encodes the "recovery id", or "recid" which is a 3-bit values
# which selects compressed/not-compressed and one of 4 possible public pairs.
#
first -= 27
is_compressed = bool(first & 0x4)
return is_compressed, (first & 0x3), r, s
def test_sign_verify_mutual_compatability(self):
if libsecp256k1 is None:
raise unittest.SkipTest("no libsecp256k1")
ctx = libsecp256k1.ctx
signature = create_string_buffer(64)
sighash = to_bytes_32(1000)
secret_key = to_bytes_32(100)
public_key = create_string_buffer(64)
r = libsecp256k1.secp256k1_ec_pubkey_create(ctx, public_key,
secret_key)
self.assertEqual(r, 1)
self.assertEqual(
b2h(public_key),
'880f50f7ceb4210289266a40b306e33ef52bb75f834c172e65175e3ce2ac3bed'
'6e2835e3d57ae1fcd0954808be17bd97bf871f7a8a5edadcffcc8812576f7ae5')
r = libsecp256k1.secp256k1_ecdsa_sign(ctx, signature, sighash,
secret_key, None, None)
self.assertEqual(r, 1)
r = libsecp256k1.secp256k1_ecdsa_verify(ctx, signature, sighash,
public_key)
self.assertEqual(r, 1)
signature1 = signature[:-1] + int2byte(byte2int(signature[-1]) ^ 1)
r = libsecp256k1.secp256k1_ecdsa_verify(ctx, signature1, sighash,
public_key)
self.assertEqual(r, 0)
def test_sign_verify_mutual_compatability(self):
if libsecp256k1 is None:
raise unittest.SkipTest("no libsecp256k1")
ctx = libsecp256k1.ctx
signature = create_string_buffer(64)
sighash = to_bytes_32(1000)
secret_key = to_bytes_32(100)
public_key = create_string_buffer(64)
r = libsecp256k1.secp256k1_ec_pubkey_create(ctx, public_key, secret_key)
self.assertEqual(r, 1)
self.assertEqual(
b2h(public_key),
'880f50f7ceb4210289266a40b306e33ef52bb75f834c172e65175e3ce2ac3bed'
'6e2835e3d57ae1fcd0954808be17bd97bf871f7a8a5edadcffcc8812576f7ae5'
)
r = libsecp256k1.secp256k1_ecdsa_sign(ctx, signature, sighash, secret_key, None, None)
self.assertEqual(r, 1)
r = libsecp256k1.secp256k1_ecdsa_verify(ctx, signature, sighash, public_key)
self.assertEqual(r, 1)
signature1 = signature[:-1] + int2byte(byte2int(signature[-1]) ^ 1)
r = libsecp256k1.secp256k1_ecdsa_verify(ctx, signature1, sighash, public_key)
self.assertEqual(r, 0)
def from_bytes(bytes, byteorder="big", signed=False):
if byteorder != "big":
bytes = reversed(bytes)
v = 0
for c in iterbytes(bytes):
v <<= 8
v += c
if signed and byte2int(bytes) & 0x80:
v = v - (1 << (8 * len(bytes)))
return v
def from_bytes(bytes, byteorder="big", signed=False):
"""This is the same functionality as ``int.from_bytes`` in python 3"""
if byteorder != "big":
bytes = reversed(bytes)
v = 0
for c in iterbytes(bytes):
v <<= 8
v += c
if signed and byte2int(bytes) & 0x80:
v = v - (1 << (8*len(bytes)))
return v
def from_bytes(bytes, byteorder="big", signed=False):
"See int.from_bytes in python 3"
if byteorder != "big":
bytes = reversed(bytes)
v = 0
for c in iterbytes(bytes):
v <<= 8
v += c
if signed and byte2int(bytes) & 0x80:
v = v - (1 << (8*len(bytes)))
return v
def __init__(self, version, hash256):
assert len(version) == 1
assert isinstance(version, bytes)
assert len(hash256) == 32
assert isinstance(hash256, bytes)
version_int = byte2int(version)
assert 0 <= version_int <= 16
self.version = version_int
self.hash256 = hash256
self._address = None
self._script = None
def __init__(self, script_tools, address_api):
self._script_tools = script_tools
self._address = address_api
for _ in "EQUAL HASH160 CHECKSIG CHECKSIGVERIFY CHECKMULTISIG CHECKMULTISIGVERIFY".split():
setattr(self, "OP_%s" % _, byte2int(self._script_tools.compile('OP_%s' % _)))
