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# vim: set filencoding=utf8
"""
Key Loader Functions
@author: Mike Crute (mcrute@gmail.com)
@organization: SoftGroup Interactive, Inc.
@date: May 05, 2010
"""
from M2Crypto import RSA, DSA
from structutils import unpack_string, get_packed_mp_ints, int_to_bytes
def load_public_key(key):
"""
Loads an RFC 4716 formatted public key.
"""
if key.startswith('ssh-'):
blob = key.split()[1].decode('base64')
else:
blob = key.decode('base64')
ktype, remainder = unpack_string(blob)
if ktype == 'ssh-rsa':
e, n = get_packed_mp_ints(remainder, 2)
return hawt.new_pub_key((e, n))
elif ktype == 'ssh-dss':
p, q, g, y = get_packed_mp_ints(remainder, 4)
return DSA.set_params(p, q, g)
raise ValueError("Invalid key")
def load_private_key(filename):
first_line = open(filename).readline()
type = DSA if 'DSA' in first_line else RSA
return type.load_key(filename)
def sign(what, key):
pk = load_private_key(key)
val = pk.sign(what, None)[0]
return int_to_bytes(val)
def verify(what, signature, key):
signature = int_to_bytes(signature)
return bool(key.verify(what, signature))
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