crypto modules

Cryptography/Block_Ciphers/AES/aes_simple_example.py

@@ -1,10 +1,5 @@
 #!/usr/bin/env python
 
-def example_sha():
-    from Crypto.Hash import SHA256
-    hash = SHA256.new()
-    hash.update('message')
-    print hash.digest()
 
 def example_aes():
     from Crypto.Cipher import AES
@@ -19,5 +14,4 @@ def example_aes():
 
 
 if __name__ == '__main__':
-    example_sha()
-    #example_aes()
+    example_aes()

Cryptography/Block_Ciphers/DES/DES_CFB_example.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+from Crypto.Cipher import DES
+from Crypto import Random
+
+iv = Random.get_random_bytes(8)
+
+des1 = DES.new('01234567', DES.MODE_CFB, iv)
+des2 = DES.new('01234567', DES.MODE_CFB, iv)
+text = 'abcdefghijklmnop'
+
+cipher_text = des1.encrypt(text)
+print cipher_text
+print des2.decrypt(cipher_text)

Cryptography/Block_Ciphers/DES/DES_ECB_example.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+from Crypto.Cipher import DES
+
+def decrypt(key, text):
+    des = DES.new(key, DES.MODE_ECB)
+    return des.decrypt(text)
+
+def encrypt(key, text):
+    des = DES.new(key, DES.MODE_ECB)
+    return des.encrypt(text)
+
+if __name__ == '__main__':
+    text = "01234567"
+    key = 'abcdefgh'
+    print encrypt(key, text)
+    print
+    print decrypt(key, text)
+

Cryptography/Hash_Functions/SHA/sha_simple_example.py

@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+
+def example_sha():
+    from Crypto.Hash import SHA256
+    hash = SHA256.new()
+    hash.update('message')
+    print hash.digest()
+
+if __name__ == '__main__':
+    example_sha()

Cryptography/Public_Key/RSA.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+
+from Crypto.PublicKey import RSA
+from Crypto import Random
+
+
+def gen_key(nbits=1024):
+    random_generator = Random.new().read
+    key = RSA.generate(nbits, random_generator)
+    return key
+
+def check_key(key):
+    print key.can_encrypt()
+    print key.can_sign()
+    print key.has_private()
+
+
+def get_pubk(key):
+    return key.publickey()
+
+
+def encrypt(public_key, text, random):
+    return public_key.encrypt(text, random)
+
+
+def decrypt(data):
+    return key.decrypt(enc_data)
+
+
+if __name__ == '__main__':
+    key = gen_key()
+
+    check_key(key)
+
+    public_key = get_pubk(key)
+
+    text = 'abcdefgh'
+    enc_data = encrypt(public_key, text, random=32)
+    print enc_data
+
+    dec_data = decrypt(enc_data)
+    print dec_data
+

Cryptography/Public_Key/RSA_sign.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+
+
+from Crypto.Hash import SHA256
+from Crypto.PublicKey import RSA
+from Crypto import Random
+
+key = RSA.generate(1024)
+text = 'abcdefgh'
+
+hash = SHA256.new(text).digest()
+print hash
+
+signature = key.sign(hash, '')
+print signature

Cryptography/Stream_Ciphers/arc4.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+
+
+from Crypto.Cipher import ARC4
+
+obj1 = ARC4.new('01234567')
+obj2 = ARC4.new('01234567')
+
+text = 'abcdefghijklmnop'
+cipher_text = obj1.encrypt(text)
+print cipher_text
+print obj2.decrypt(cipher_text)