diff options
Diffstat (limited to 'tests/utils.py')
| -rw-r--r-- | tests/utils.py | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tests/utils.py b/tests/utils.py index 60b6f5a2..d8565130 100644 --- a/tests/utils.py +++ b/tests/utils.py @@ -80,6 +80,33 @@ def raises_unsupported_algorithm(reason): assert exc_info.value._reason is reason +def _int_to_asn1_int(i): + """ + Used by dss_sig_value to convert python integers to ASN.1 integer bytes. + """ + if i == 0: + return b'\x02\x01\x00' + if i < 0: + raise ValueError("This only supports positive integers right now.") + result = [] + while i: + result.append(six.int2byte(i & 0xFF)) + i >>= 8 + # ASN.1 integers are stored big endian two's complement, so add a byte if + # the ordinal value of the last byte is over 0x7f. + if ord(result[-1]) > 127: + result.append(b"\x00") + result.reverse() + packed = b''.join(result) + return b"\x02" + chr(len(packed)).encode("ascii") + packed + + +def dss_sig_value(r, s): + combined = _int_to_asn1_int(r) + _int_to_asn1_int(s) + sig = b"0" + chr(len(combined)).encode("ascii") + combined + return sig + + def load_vectors_from_file(filename, loader): with cryptography_vectors.open_vector_file(filename) as vector_file: return loader(vector_file) |