diff options
Diffstat (limited to 'qa/rpc-tests/test_framework/key.py')
| -rw-r--r-- | qa/rpc-tests/test_framework/key.py | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/qa/rpc-tests/test_framework/key.py b/qa/rpc-tests/test_framework/key.py index ba3038fe04..c63a15c1e0 100644 --- a/qa/rpc-tests/test_framework/key.py +++ b/qa/rpc-tests/test_framework/key.py @@ -75,6 +75,9 @@ ssl.EC_POINT_mul.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p, # this specifies the curve used with ECDSA. NID_secp256k1 = 714 # from openssl/obj_mac.h +SECP256K1_ORDER = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 +SECP256K1_ORDER_HALF = SECP256K1_ORDER // 2 + # Thx to Sam Devlin for the ctypes magic 64-bit fix. def _check_result(val, func, args): if val == 0: @@ -147,7 +150,7 @@ class CECKey(object): r = self.get_raw_ecdh_key(other_pubkey) return kdf(r) - def sign(self, hash): + def sign(self, hash, low_s = True): # FIXME: need unit tests for below cases if not isinstance(hash, bytes): raise TypeError('Hash must be bytes instance; got %r' % hash.__class__) @@ -159,7 +162,25 @@ class CECKey(object): mb_sig = ctypes.create_string_buffer(sig_size0.value) result = ssl.ECDSA_sign(0, hash, len(hash), mb_sig, ctypes.byref(sig_size0), self.k) assert 1 == result - return mb_sig.raw[:sig_size0.value] + assert mb_sig.raw[0] == 0x30 + assert mb_sig.raw[1] == sig_size0.value - 2 + total_size = mb_sig.raw[1] + assert mb_sig.raw[2] == 2 + r_size = mb_sig.raw[3] + assert mb_sig.raw[4 + r_size] == 2 + s_size = mb_sig.raw[5 + r_size] + s_value = int.from_bytes(mb_sig.raw[6+r_size:6+r_size+s_size], byteorder='big') + if (not low_s) or s_value <= SECP256K1_ORDER_HALF: + return mb_sig.raw[:sig_size0.value] + else: + low_s_value = SECP256K1_ORDER - s_value + low_s_bytes = (low_s_value).to_bytes(33, byteorder='big') + while len(low_s_bytes) > 1 and low_s_bytes[0] == 0 and low_s_bytes[1] < 0x80: + low_s_bytes = low_s_bytes[1:] + new_s_size = len(low_s_bytes) + new_total_size_byte = (total_size + new_s_size - s_size).to_bytes(1,byteorder='big') + new_s_size_byte = (new_s_size).to_bytes(1,byteorder='big') + return b'\x30' + new_total_size_byte + mb_sig.raw[2:5+r_size] + new_s_size_byte + low_s_bytes def verify(self, hash, sig): """Verify a DER signature""" |