diff options
| -rw-r--r-- | ecdsa/rfc6979.py | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/ecdsa/rfc6979.py b/ecdsa/rfc6979.py index 92509fd..b36c20a 100644 --- a/ecdsa/rfc6979.py +++ b/ecdsa/rfc6979.py @@ -15,6 +15,19 @@ import hmac from binascii import hexlify from util import number_to_string, number_to_string_crop +try: + bin(0) +except NameError: + binmap = {"0": "0000", "1": "0001", "2": "0010", "3": "0011", + "4": "0100", "5": "0101", "6": "0110", "7": "0111", + "8": "1000", "9": "1001", "a": "1010", "b": "1011", + "c": "1100", "d": "1101", "e": "1110", "f": "1111"} + def bin(value): # for python2.5 + v = "".join(binmap[x] for x in "%x"%abs(value)).lstrip("0") + if value < 0: + return "-0b" + v + return "0b" + v + def bit_length(num): # http://docs.python.org/dev/library/stdtypes.html#int.bit_length s = bin(num) # binary representation: bin(-37) --> '-0b100101' |