Merge branch 'master' into add-ChathuminaVimukthi

Author: prateekiiest

CONTRIBUTORS.md

@@ -9,5 +9,8 @@ Thanks for all your contributions :heart: :octocat:
 | [de1ux](https://github.com/de1ux)   | [Requirements](https://github.com/prateekiiest/Code-Sleep-Python/pull/22) | Merged |
 | [mstuttgart](https://github.com/mstuttgart)   | [README adjusts](https://github.com/prateekiiest/Code-Sleep-Python/pull/3) | Merged |
 | [blossomica](https://github.com/blossomica) |[Fix Broken Code Links](https://github.com/prateekiiest/Code-Sleep-Python/pull/18) | Merged | 
+| [jasperdchen](https://github.com/jasperdchen) | [README](https://github.com/prateekiiest/Code-Sleep-Python/pull/31) | Merged |
+| [Binsquare](https://github.com/binsquare) | [Added project descriptions](https://github.com/prateekiiest/Code-Sleep-Python/pull/26) | Merged |
 | [Chathumina Vimukthi](https://github.com/ChathuminaVimukthi)  |[Added hangman game](https://github.com/prateekiiest/Code-Sleep-Python/pull/30) | Merged |
 
+

Encryption-Techniques/AES/AES256.py

@@ -0,0 +1,150 @@
+from copy import copy
+from tables import *
+
+def subBytes(block):
+	for i in range(len(block)):
+		block[i] = sbox[block[i]]
+	return block
+
+def subBytesInv(block):
+	for i in range(len(block)):
+		block[i] = sboxInv[block[i]]
+	return block
+
+def keyScheduleCore(word, i):
+	newWord = word[1:]+word[:1]
+	subBytes(newWord)
+	newWord[0] = newWord[0] ^ rCon[i]
+	return newWord
+
+def expandKey(cipherKey):
+	cipherKeySize = len(cipherKey)
+	assert cipherKeySize == 32
+	expandedKey = []
+	currentSize,rconIter = 0,1
+
+	t = [0,0,0,0]
+
+	for i in range(cipherKeySize):
+		expandedKey.append(cipherKey[i])
+	currentSize += cipherKeySize
+
+	while currentSize < 240:
+		for i in range(4):
+			t[i] = expandedKey[(currentSize - 4) + i]
+		if currentSize % cipherKeySize == 0:
+			t = keyScheduleCore(t, rconIter)
+			rconIter += 1
+		if currentSize % cipherKeySize == 16:
+			for i in range(4):
+				t[i] = sbox[t[i]]
+		for i in range(4):
+			expandedKey.append(((expandedKey[currentSize - cipherKeySize]) ^ (t[i])))
+			currentSize += 1
+	return expandedKey
+
+def createRoundKey(expandedKey,i):
+	return expandedKey[i*16:i*16+16]
+
+def addroundkey(block,roundKey):
+	for i in range(len(block)):
+		block[i] = block[i] ^ roundKey[i]
+	return block
+
+def blockfileColumn(filename):
+	test2 = filename
+	testarr = []
+	for row in range(0,4):
+		for column in range(0,len(test2),4):
+			testarr.append(test2[row+column])
+	return testarr
+
+def rotate(rotate, n):
+	return rotate[n:]+rotate[0:n]
+
+def shiftRow(blockfile):
+	block = blockfileColumn(blockfile)
+	for i in range(4):
+		block[i*4:i*4+4] = rotate(block[i*4:i*4+4], i)
+	blockDone = blockfileColumn(block)
+	return blockDone
+
+def shiftRowInv(blockfile):
+	block = blockfileColumn(blockfile)
+	for i in range(4):
+		block[i*4:i*4+4] = rotate(block[i*4:i*4+4], -i)
+	block = blockfileColumn(block)
+	return block
+
+def mixColumn(column):
+	col = copy(column)
+	column[0] = table_2[col[0]] ^ table_3[col[1]] ^ col[2] ^ col[3]
+	column[1] = col[0] ^ table_2[col[1]] ^ table_3[col[2]] ^ col[3]
+	column[2] = col[0] ^ col[1] ^ table_2[col[2]] ^ table_3[col[3]]
+	column[3] = table_3[col[0]] ^ col[1] ^ col[2] ^ table_2[col[3]]
+	return column
+
+
+def mixColumns(col):
+	outCol = []
+	for i in range(0,len(col),4):
+		outCol.append(mixColumn(col[i:i+4]))
+	return listoflist2singlelist(outCol)
+
+def mixColumnInv(column):
+	col = copy(column)
+	column[0] = table_14[col[0]] ^ table_11[col[1]] ^ table_13[col[2]] ^ table_9[col[3]]
+	column[1] = table_9[col[0]] ^ table_14[col[1]] ^ table_11[col[2]] ^ table_13[col[3]]
+	column[2] = table_13[col[0]] ^ table_9[col[1]] ^ table_14[col[2]] ^ table_11[col[3]]
+	column[3] = table_11[col[0]] ^ table_13[col[1]] ^ table_9[col[2]] ^ table_14[col[3]]
+	return column
+
+
+def mixColumnsInv(col):
+	intList = []
+	for i in range(0,len(col),4):
+		intList.append(mixColumnInv(col[i:i+4]))
+	return listoflist2singlelist(intList)
+
+def listoflist2singlelist(column):
+	columnList = []
+	for row in column:
+		for i in range(0,len(row)):
+			columnList.append(row[i])
+	return columnList
+
+def encrypt(block,key):
+	expandedKey = expandKey(key)
+	roundKey = createRoundKey(expandedKey,0)
+	block = addroundkey(block,roundKey)
+
+	for i in range(1,14):
+		roundKey = createRoundKey(expandedKey,i)
+		block = subBytes(block)
+		block = shiftRow(block)
+		block = mixColumns(block)
+		block = addroundkey(block,roundKey)
+
+	roundKey = createRoundKey(expandedKey,14)
+	block = subBytes(block)
+	block = shiftRow(block)
+	block = addroundkey(block,roundKey)
+	return block
+
+def decrypt(block,key):
+	expandedKey = expandKey(key)
+	roundKey = createRoundKey(expandedKey,14)
+	block = addroundkey(block,roundKey)
+	block = shiftRowInv(block)
+	block = subBytesInv(block)
+
+	for i in range(13,0,-1):
+		roundKey = createRoundKey(expandedKey,i)
+		block = addroundkey(block,roundKey)
+		block = mixColumnsInv(block)
+		block = shiftRowInv(block)
+		block = subBytesInv(block)
+
+	roundKey = createRoundKey(expandedKey,0)
+	block = addroundkey(block,roundKey)
+	return block

Encryption-Techniques/AES/README

@@ -0,0 +1,10 @@
+Instructions:
+	1. The 16-byte hex you want to encrypt is in file 'testBlock'.
+	2. The key for this encryption is in file 'testKey'. Key is 32 byte hex.
+	3. To encrypt run -
+		python main.py encrypt
+		--- Encrypted text gets written in file 'encrypted_file'
+	4. To decrypt run -
+		python main.py decrypt
+		--- Decrypted text gets written in file 'decrypted_file'
+

Encryption-Techniques/AES/demo.png

@@ -0,0 +1,52 @@
+from readfiles import *
+from AES256 import *
+import argparse
+from argparse import RawTextHelpFormatter
+import time
+
+parser = argparse.ArgumentParser(description='AES 256-bit encrypt and decrypt', formatter_class=RawTextHelpFormatter)
+parser.add_argument('mode',help="encrypt or decrypt")
+args = parser.parse_args()
+
+mode = str(args.mode).lower()
+
+def fileEncrypt():
+	block = getEncryptBlock("testBlock")
+	key = getKey("testKey")
+	outfile = open("encrypted_file","wb")
+	strangen = ""
+	cryptLargeblock = []
+	for i in range(len(block)):
+		cryptLargeblock.append(encrypt(block[i],key))
+
+	while i < len(cryptLargeblock):
+		for row in cryptLargeblock:
+			for item in row:
+				strangen += hex(item)[2:].zfill(2)
+		i += 1
+	outfile.write(strangen)
+	outfile.close()
+	print strangen
+
+def fileDecrypt():
+	key = getKey("testKey")
+	file = open("decrypted_file","wb")
+	decryptBlock = []
+	decString = ""
+	eblock = getDecryptBlock("encrypted_file")
+
+	for i in range(len(eblock)):
+		decryptBlock.append(decrypt(eblock[i],key))
+
+	for row in decryptBlock:
+		for item in row:
+			decString += chr(item)
+
+	file.write(decString)
+	file.close()
+	print decString
+
+if mode == "encrypt" or mode == "e":
+	fileEncrypt()
+elif mode == "decrypt" or mode == "d":
+	fileDecrypt()

Encryption-Techniques/AES/main.py

@@ -0,0 +1,38 @@
+def getKey(filename):
+	len_key = 64
+	keyfile = open(filename, 'r')
+	hexadecimalkey = keyfile.read()
+	keyarray = []
+	for i in range(0, len_key, 2):
+		keyarray.append(int(hexadecimalkey[i:i+2], 16))
+	return keyarray
+
+def getDecryptBlock(block):
+	file = open(block, 'r')
+	byte = file.read()
+	blockarray = []
+	block = []
+	for i in range(0,len(byte),2):
+		blockarray.append(int(byte[i:i+2],16))
+
+	for i in range(0,len(blockarray),16):
+		block.append(blockarray[i:i+16])
+	return block
+
+def getEncryptBlock(block):
+	file = open(block,'rb')
+	byte = file.read().encode("hex")
+	blockarray = []
+	arr = []
+	for i in range(0,len(byte),2):
+		arr.append(int(byte[i:i+2], 16))
+
+	while len(arr) >= 16:
+		blockarray.append(arr[0:16])
+		arr = arr[16:]
+		if len(arr) < 16:
+			temparray = [0]*16
+			for k in range(0,len(arr)):
+				temparray[k] = arr[k]
+			blockarray.append(temparray)
+	return blockarray