feat: AES

MohamedSaidSallam · Jan 22, 2021 · e41714b · e41714b
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diff --git a/CHANGELOG.MD b/CHANGELOG.MD
@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+## [v0.3.1] - 2021-01-22
+
+### Added
+
+- AES
+
 ## [v0.2.1] - 2021-01-22
 
 ### Added
@@ -24,6 +30,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Initial Files
 - read files
 
-[Unreleased]: https://github.com/TheDigitalPhoenixX/Encryption-Techniques/compare/v0.2.1...HEAD
+[Unreleased]: https://github.com/TheDigitalPhoenixX/Encryption-Techniques/compare/v0.3.1...HEAD
+[v0.3.1]: https://github.com/TheDigitalPhoenixX/Encryption-Techniques/compare/v0.2.1...v0.3.1
 [v0.2.1]: https://github.com/TheDigitalPhoenixX/Encryption-Techniques/compare/v0.1.7...v0.2.1
 [v0.1.7]: https://github.com/TheDigitalPhoenixX/Encryption-Techniques/releases/tag/v0.1.7
diff --git a/README.md b/README.md
@@ -7,6 +7,7 @@ A simple python script that offers multiple simple implementations for encryptio
 
 Supported Encryption Techniques:
 
+- AES
 - DES
 - Playfair Cipher
 - Hill Cipher
@@ -61,7 +62,7 @@ Output:
 usage: __main__.py [-h] -i INPUT [-o OUTPUT] [--caesarCipherEncrypt]
                    [--vigenereCipherEncrypt] [--vernamCipherEncrypt]
                    [--hillCipherEncrypt] [--playfairCipherEncrypt]
-                   [--DESEncrypt] [--DESDecrypt]
+                   [--DESEncrypt] [--DESDecrypt] [--AESEncrypt] [--AESDecrypt]
                    ...
 
 A simple python script that offers multiple simple impementation for
@@ -97,6 +98,10 @@ optional arguments:
                         use. (parameters: key(16 Hex Chars), Number of rounds)
   --DESDecrypt          selects 'DESDecrypt' as the encryption technique to
                         use. (parameters: key(16 Hex Chars), Number of rounds)
+  --AESEncrypt          selects 'AESEncrypt' as the encryption technique to
+                        use. (parameters: Key (32 Hex characters))
+  --AESDecrypt          selects 'AESDecrypt' as the encryption technique to
+                        use. (parameters: Key (32 Hex characters))
 
 Source: https://github.com/TheDigitalPhoenixX/Encryption-Techniques
 ```
@@ -127,6 +132,13 @@ py -m encryption -i "input examples/des_decrypt_1.txt" -o des_decrypt_1.txt --DE
 py -m encryption -i "input examples/des_decrypt_2.txt" -o des_decrypt_2.txt --DESDecrypt 0000000000000000 2
 ```
 
+AES:
+
+```sh
+py -m encryption -i "input examples/aes.txt" -o aes.txt --AESEncrypt 0123456789ABCDEF0123456789ABCDEF
+py -m encryption -i "input examples/aes_decrypt.txt" -o aes_decrypt.txt --AESDecrypt 0123456789ABCDEF0123456789ABCDEF
+```
+
 ## Built With
 
 - [Visual Studio Code](https://code.visualstudio.com/) - Code Editor

diff --git a/encryption/__main__.py b/encryption/__main__.py
@@ -8,6 +8,7 @@
 from encryption.techniques.classical import hillCipherEncrypt, hillCipherEncryptParam
 from encryption.techniques.classical import playfairCipherEncrypt, playfairCipherEncryptParam
 from encryption.techniques.des import DESEncrypt, DESDecrypt, DESEncryptParam
+from encryption.techniques.aes import AESEncrypt, AESDecrypt, AESEncryptParam
 
 encryptionTechniques = [
     (caesarCipherEncrypt, caesarCipherEncryptParam),
@@ -17,6 +18,8 @@
     (playfairCipherEncrypt, playfairCipherEncryptParam),
     (DESEncrypt, DESEncryptParam),
     (DESDecrypt, DESEncryptParam),
+    (AESEncrypt, AESEncryptParam),
+    (AESDecrypt, AESEncryptParam),
 ]
 
 parser = argparse.ArgumentParser(

diff --git a/encryption/techniques/aes.py b/encryption/techniques/aes.py
@@ -0,0 +1,201 @@
+AESEncryptParam = "Key (32 Hex characters)"
+
+S_BOX = (
+    0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
+    0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
+    0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
+    0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
+    0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
+    0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
+    0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
+    0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
+    0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
+    0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
+    0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
+    0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
+    0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
+    0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
+    0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
+    0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16,
+)
+
+S_BOX_INVERSE = (
+    0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,
+    0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,
+    0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,
+    0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,
+    0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,
+    0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,
+    0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,
+    0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,
+    0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,
+    0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,
+    0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,
+    0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,
+    0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,
+    0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,
+    0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,
+    0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D,
+)
+
+R_CON = (
+    0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40,
+    0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,
+    0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,
+    0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91, 0x39,
+)
+KEYSIZE_ROUNDS_MAP = {16: 10, 24: 12, 32: 14}
+
+
+def shiftRows(s):
+    s[0][1], s[1][1], s[2][1], s[3][1] = s[1][1], s[2][1], s[3][1], s[0][1]
+    s[0][2], s[1][2], s[2][2], s[3][2] = s[2][2], s[3][2], s[0][2], s[1][2]
+    s[0][3], s[1][3], s[2][3], s[3][3] = s[3][3], s[0][3], s[1][3], s[2][3]
+
+
+def shiftRowsInvert(s):
+    s[0][1], s[1][1], s[2][1], s[3][1] = s[3][1], s[0][1], s[1][1], s[2][1]
+    s[0][2], s[1][2], s[2][2], s[3][2] = s[2][2], s[3][2], s[0][2], s[1][2]
+    s[0][3], s[1][3], s[2][3], s[3][3] = s[1][3], s[2][3], s[3][3], s[0][3]
+
+
+def addRoundKey(input, roundKey):
+    for i in range(4):
+        for j in range(4):
+            input[i][j] ^= roundKey[i][j]
+
+
+def substituteGeneric(input, subTable):
+    for i in range(4):
+        for j in range(4):
+            input[i][j] = subTable[input[i][j]]
+
+
+def substitute(input):
+    substituteGeneric(input, S_BOX)
+
+
+def substituteInverse(input):
+    substituteGeneric(input, S_BOX_INVERSE)
+
+
+def xtime(a):
+    return (((a << 1) ^ 0x1B) & 0xFF) if (a & 0x80) else (a << 1)
+
+
+def mixSingleCol(input):
+    t = input[0] ^ input[1] ^ input[2] ^ input[3]
+    u = input[0]
+    input[0] ^= t ^ xtime(input[0] ^ input[1])
+    input[1] ^= t ^ xtime(input[1] ^ input[2])
+    input[2] ^= t ^ xtime(input[2] ^ input[3])
+    input[3] ^= t ^ xtime(input[3] ^ u)
+
+
+def mixColumns(input):
+    for i in range(4):
+        mixSingleCol(input[i])
+
+
+def mixColumnsInverse(input):
+    for i in range(4):
+        u, v = xtime(xtime(input[i][0] ^ input[i][2])), xtime(
+            xtime(input[i][1] ^ input[i][3]))
+        input[i][0] ^= u
+        input[i][1] ^= v
+        input[i][2] ^= u
+        input[i][3] ^= v
+
+    mixColumns(input)
+
+
+def bytesToMatrix(input):
+    return [list(input[i:i+4]) for i in range(0, len(input), 4)]
+
+
+def matrixToBytes(matrix):
+    return bytes(sum(matrix, []))
+
+
+def xor(a, b):
+    return bytes(a[i] ^ b[i] for i in range(len(a)))
+
+
+def expandKey(key, numberOfRounds):
+
+    keyColumns = bytesToMatrix(key)
+    iteration_size = len(key) // 4
+
+    i = 1
+    while len(keyColumns) < ((numberOfRounds + 1) * 4):
+
+        word = list(keyColumns[-1])
+
+        if len(keyColumns) % iteration_size == 0:
+            word = word[1:] + [word[0]]
+            word = [S_BOX[b] for b in word]
+            word[0] ^= R_CON[i]
+            i += 1
+        elif len(key) == 32 and len(keyColumns) % iteration_size == 4:
+            word = [S_BOX[b] for b in word]
+
+        word = xor(word, keyColumns[-iteration_size])
+        keyColumns.append(word)
+
+    return [keyColumns[4*i: 4*(i+1)] for i in range(len(keyColumns) // 4)]
+
+
+def getInitalInfo(param):
+    key = bytearray.fromhex(param[0])
+    numberOfRounds = KEYSIZE_ROUNDS_MAP[len(key)]
+    keyMatrices = expandKey(key, numberOfRounds)
+
+    return numberOfRounds, keyMatrices
+
+
+def prepareInput(input):
+    return bytesToMatrix(bytearray.fromhex(input[0].strip()))
+
+
+def prepareOutput(output):
+    return [matrixToBytes(output).hex().upper()]
+
+
+def AESEncrypt(input, param):
+    numberOfRounds, keyMatrices = getInitalInfo(param)
+
+    output = prepareInput(input)
+
+    addRoundKey(output, keyMatrices[0])
+
+    for i in range(1, numberOfRounds):
+        substitute(output)
+        shiftRows(output)
+        mixColumns(output)
+        addRoundKey(output, keyMatrices[i])
+
+    substitute(output)
+    shiftRows(output)
+    addRoundKey(output, keyMatrices[-1])
+
+    return prepareOutput(output)
+
+
+def AESDecrypt(input, param):
+    numberOfRounds, keyMatrices = getInitalInfo(param)
+
+    output = prepareInput(input)
+
+    addRoundKey(output, keyMatrices[-1])
+    shiftRowsInvert(output)
+    substituteInverse(output)
+
+    for i in range(numberOfRounds - 1, 0, -1):
+        addRoundKey(output, keyMatrices[i])
+        mixColumnsInverse(output)
+        shiftRowsInvert(output)
+        substituteInverse(output)
+
+    addRoundKey(output, keyMatrices[0])
+
+    return prepareOutput(output)
diff --git a/input examples/aes.txt b/input examples/aes.txt
@@ -0,0 +1 @@
+0123456789ABCDEF0123456789ABCDEF
diff --git a/input examples/aes_decrypt.txt b/input examples/aes_decrypt.txt
@@ -0,0 +1 @@
+A1EE5608B33AF05470858608D1DE080F