def __init__(self, d):
if isinstance(d, int) or isinstance(d, long):
self.value = d
self.bytes = crypto.i2b(d)
return
if isinstance(d, basestring):
stream = io.BytesIO(d)
elif isinstance(d, io.BytesIO):
stream = d
bits = crypto.b2i(stream.read(2))
mpiBytes = int(math.ceil(float(bits) / 8))
self.bytes = stream.read(mpiBytes)
self.value = crypto.b2i(self.bytes)
def isValid(self, keyMessage):
"""
Verify the self signature.
"""
key = keyMessage.packets.get(PublicKeyPacket.TAG)
if key is None:
key = keyMessage.packets.get(SecretKeyPacket.TAG)
if key is None:
raise Exception('no key in message')
em = crypto.i2b(crypto.rsaEncrypt(self.signature.value, key.e.value,
key.n.value))
return encoding.pssVerify(self.hashdata(), em,
crypto.HASH_SIZE[crypto.HASH_SHA256] / 8,
key.n.bits() - 1, crypto.HASH_SHA256)
def __str__(self):
return ('MPI (%d bits): 0x%s' %
(self.bits(), crypto.i2b(self.value).encode('hex')))
def rep(self, octets = 0):
return crypto.i2b(self.value, octets)
def rep(self):
return crypto.i2b(self.bits(), 2) + crypto.i2b(self.value)