X-Git-Url: http://gitweb.pimeys.fr/?p=NK2015_Client_Python_Alpha.git;a=blobdiff_plain;f=rsa_source%2Frsa%2Fcore.py;fp=rsa_source%2Frsa%2Fcore.py;h=cc95f592b3790a9df514f0d7c73db08af9c7b385;hp=0000000000000000000000000000000000000000;hb=76e06d82c94bcb814b95419c7faaeacf4beb0155;hpb=d621c5224a44dc20bc2aaf661954fd1df65dd147

diff --git a/rsa_source/rsa/core.py b/rsa_source/rsa/core.py
new file mode 100644
index 0000000..cc95f59
--- /dev/null
+++ b/rsa_source/rsa/core.py
@@ -0,0 +1,60 @@
+# -*- coding: utf-8 -*-
+#
+#  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+'''Core mathematical operations.
+
+This is the actual core RSA implementation, which is only defined
+mathematically on integers.
+'''
+
+import types
+
+def assert_int(var, name):
+
+    if type(var) in (types.IntType, types.LongType):
+        return
+
+    raise TypeError('%s should be an integer, not %s' % (name, var.__class__))
+
+def encrypt_int(message, ekey, n):
+    """Encrypts a message using encryption key 'ekey', working modulo n"""
+
+    assert_int(message, 'message')
+    assert_int(ekey, 'ekey')
+    assert_int(n, 'n')
+
+    if message < 0:
+        raise ValueError('Only non-negative numbers are supported')
+         
+    if message > n:
+        raise OverflowError("The message %i is too long for n=%i" % (message, n))
+
+    return pow(message, ekey, n)
+
+def decrypt_int(cyphertext, dkey, n):
+    """Decrypts a cypher text using the decryption key 'dkey', working
+    modulo n"""
+
+    if type(cyphertext) not in (types.IntType, types.LongType):
+        raise TypeError('cyphertext should be an integer, not %s' %
+                cyphertext.__type__)
+
+    assert_int(cyphertext, 'cyphertext')
+    assert_int(dkey, 'dkey')
+    assert_int(n, 'n')
+
+    message = pow(cyphertext, dkey, n)
+    return message
+