def attack(public_key_file, cipher):
key = open(public_key_file, 'r')
rsakey = RSA.importKey(key)
s = 2
modified = square_multiply(s, rsakey.e, rsakey.n)
cipher = int(binascii.hexlify(cipher), 16)
modified = (cipher * modified) % rsakey.n
return binascii.unhexlify(hex(modified)[2:-1])
def attack(public_key_file,cipher):
key=open(public_key_file,'r')
rsakey=RSA.importKey(key)
s=2
modified = square_multiply(s,rsakey.e,rsakey.n)
cipher = int(binascii.hexlify(cipher),16)
modified = (cipher*modified)%rsakey.n
return binascii.unhexlify(hex(modified)[2:-1])
def decrypt_RSA(private_key_file, cipher, state='sm'):
key = open(private_key_file,'r').read()
rsakey = RSA.importKey(key)
if state == 'sm':
cipher_int = pyrsa_sq_mul.unpack_bigint(cipher)
decrypted_byte_message_int = pyrsa_sq_mul.square_multiply(cipher_int, rsakey.d, rsakey.n)
decrypted_byte_message_str = pyrsa_sq_mul.pack_bigint(decrypted_byte_message_int)
elif state == 'part3':
cipher_rsa = PKCS1_OAEP.new(rsakey)
decrypted_byte_message_str = cipher_rsa.decrypt(cipher)
return decrypted_byte_message_str
def encrypt_RSA(public_key_file, message, state='sm'):
key = open(public_key_file,'r').read()
rsakey = RSA.importKey(key)
if state == 'sm':
if isinstance(message, int):
byte_message_int = message
else:
byte_message_int = pyrsa_sq_mul.unpack_bigint(message)
encrypt_byte_message_int = pyrsa_sq_mul.square_multiply(byte_message_int, rsakey.e, rsakey.n)
encrypt_byte_message_str = pyrsa_sq_mul.pack_bigint(encrypt_byte_message_int)
elif state == 'part3':
cipher_rsa = PKCS1_OAEP.new(rsakey)
encrypt_byte_message_str = cipher_rsa.encrypt(message)
return encrypt_byte_message_str
parser = argparse.ArgumentParser(description='RSA')
parser.add_argument('-pub', dest='pub', help='public key')
parser.add_argument('-priv', dest='priv', help='private key')
parser.add_argument('-message', dest='message', help='message')
args = parser.parse_args()
pub = args.pub
priv = args.priv
message = open(args.message).read()
ciphertext = encrypt_RSA(pub, message)
plaintext = decrypt_RSA(priv, ciphertext)
print plaintext
signature = sign_RSA(priv, message)
verify = verify_sign(pub, signature, message)
signature = bin(100)
key = open(pub, 'r')
rsakey = RSA.importKey(key)
message = bin(square_multiply(100, rsakey.e, rsakey.n))
verify_sign(pub, signature, message)
message = bin(100)
cipher = encrypt_RSA(pub, message)
modified = attack(pub, cipher)
decrypt = decrypt_RSA(priv, modified)
print "ENCRYPTING:", message
print "CIPHER:", cipher
print "MODIFIED:", modified
print "DECRYPTED:", ord(decrypt)
print ""
parser.add_argument('-pub', dest='pub',help='public key')
parser.add_argument('-priv', dest='priv',help='private key')
parser.add_argument('-message', dest='message', help='message')
args=parser.parse_args()
pub=args.pub
priv=args.priv
message=open(args.message).read()
ciphertext = encrypt_RSA(pub,message)
plaintext = decrypt_RSA(priv,ciphertext)
print plaintext
signature = sign_RSA(priv, message)
verify = verify_sign(pub,signature,message)
signature = bin(100)
key=open(pub,'r')
rsakey=RSA.importKey(key)
message = bin(square_multiply(100,rsakey.e,rsakey.n))
verify_sign(pub,signature,message)
message=bin(100)
cipher = encrypt_RSA(pub,message)
modified = attack(pub,cipher)
decrypt = decrypt_RSA(priv,modified)
print "ENCRYPTING:",message
print "CIPHER:",cipher
print "MODIFIED:",modified
print "DECRYPTED:",ord(decrypt)
print ""