def get_public_key_breakdown(cls, key):
"""Returns the breakdown of the given public key.
:param str key: PEM encoded RSA public key.
:return: Tuple of binary key, modulus and exponent.
:rtype: (str, str, str)
"""
# Strip the text part
if not (key.startswith(cls.PUB_KEY_BEGIN)
and key.endswith(cls.PUB_KEY_END)):
raise RuntimeError('Given key is not Public key')
key = key[len(cls.PUB_KEY_BEGIN):-len(cls.PUB_KEY_END)]
# Convert to der format
key_bin = base64.b64decode(key)
key = nice_binary_to_string(key_bin, sep=' ',
length=len(key_bin)).split(' ')
# Parse the key
key_objs = asn1.parse(key)
# Get the modulus & exponent
modulus = ' '.join(key_objs[0].value[2].value[0].value)
exponent = ' '.join(key_objs[0].value[2].value[1].value)
# return the keys in binary
return (key_bin, nice_string_to_binary(modulus, sep=' '),
nice_string_to_binary(exponent, sep=' '))
def con_bin_2_list(v):
return nice_binary_to_string(v, sep=':', length=len(v)).split(':')