def Read(key):
"""
Reads a RSA public key from a JSON string representation of it.
@param key: a JSON representation of a RSA public key
@type key: string
@return: a RSA public key
@rtype: L{RsaPublicKey}
"""
rsa = json.loads(key)
params = {'modulus' : util.Decode(rsa['modulus']),
'publicExponent' : util.Decode(rsa['publicExponent'])}
pubkey = RSA.construct((util.BytesToLong(params['modulus']),
util.BytesToLong(params['publicExponent'])))
return RsaPublicKey(params, pubkey, rsa['size'])
def Read(key):
"""
Reads a DSA private key from a JSON string representation of it.
@param key: a JSON representation of a DSA private key
@type key: string
@return: an DSA private key
@rtype: L{DsaPrivateKey}
"""
dsa = json.loads(key)
pub = DsaPublicKey.Read(json.dumps(dsa['publicKey']))
params = {'x': util.Base64WSDecode(dsa['x'])}
key = DSA.construct((util.BytesToLong(pub._params['y']),
util.BytesToLong(pub._params['g']),
util.BytesToLong(pub._params['p']),
util.BytesToLong(pub._params['q']),
util.BytesToLong(params['x'])))
return DsaPrivateKey(params, pub, key, dsa['size'])
def Read(key):
"""
Reads a DSA public key from a JSON string representation of it.
@param key: a JSON representation of a DSA public key
@type key: string
@return: a DSA public key
@rtype: L{DsaPublicKey}
"""
dsa = json.loads(key)
params = {'y' : util.Decode(dsa['y']),
'p' : util.Decode(dsa['p']),
'g' : util.Decode(dsa['g']),
'q' : util.Decode(dsa['q'])}
pubkey = DSA.construct((util.BytesToLong(params['y']),
util.BytesToLong(params['g']),
util.BytesToLong(params['p']),
util.BytesToLong(params['q'])))
return DsaPublicKey(params, pubkey, dsa['size'])
def Read(key):
"""
Reads a RSA private key from a JSON string representation of it.
@param key: a JSON representation of a RSA private key
@type key: string
@return: a RSA private key
@rtype: L{RsaPrivateKey}
"""
rsa = json.loads(key)
pub = RsaPublicKey.Read(json.dumps(rsa['publicKey']))
params = {
'privateExponent': util.Base64WSDecode(rsa['privateExponent']),
'primeP': util.Base64WSDecode(rsa['primeP']),
'primeQ': util.Base64WSDecode(rsa['primeQ']),
'primeExponentP': util.Base64WSDecode(rsa['primeExponentP']),
'primeExponentQ': util.Base64WSDecode(rsa['primeExponentQ']),
'crtCoefficient': util.Base64WSDecode(rsa['crtCoefficient'])
}
key = RSA.construct((util.BytesToLong(pub.params['modulus']),
util.BytesToLong(pub.params['publicExponent']),
util.BytesToLong(params['privateExponent']),
util.BytesToLong(params['primeQ']),
util.BytesToLong(params['primeP']),
util.BytesToLong(params['crtCoefficient'])))
return RsaPrivateKey(params, pub, key, rsa['size'])
def Verify(self, msg, sig):
"""
Return True if the signature corresponds to the message.
@param msg: message that has been signed
@type msg: string
@param sig: string representation of long int signature
@type sig: string
@return: True if signature is valid for the message hash. False otherwise.
@rtype: boolean
"""
try:
return self.key.verify(util.MakeEmsaMessage(msg, self.size), (util.BytesToLong(sig),))
except ValueError:
# if sig is not a long, it's invalid
return False
