SRNI-2005/ctf

1import base642import codecs3 4from CTFd.utils import string_types5 6 7def hexencode(s):8    if isinstance(s, string_types):9        s = s.encode("utf-8")10    encoded = codecs.encode(s, "hex")11    try:12        encoded = encoded.decode("utf-8")13    except UnicodeDecodeError:14        pass15    return encoded16 17 18def hexdecode(s):19    decoded = codecs.decode(s, "hex")20    try:21        decoded = decoded.decode("utf-8")22    except UnicodeDecodeError:23        pass24    return decoded25 26 27def base64encode(s):28    if isinstance(s, string_types):29        s = s.encode("utf-8")30 31    encoded = base64.urlsafe_b64encode(s).rstrip(b"\n=")32    try:33        encoded = encoded.decode("utf-8")34    except UnicodeDecodeError:35        pass36    return encoded37 38 39def base64decode(s):40    if isinstance(s, string_types):41        s = s.encode("utf-8")42 43    decoded = base64.urlsafe_b64decode(s.ljust(len(s) + len(s) % 4, b"="))44    try:45        decoded = decoded.decode("utf-8")46    except UnicodeDecodeError:47        pass48    return decoded49