├── README.md
└── encrypt.py


/README.md:
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1 | # File-Encrypter
2 | This is a Simple encryption program using python.
3 | This program uses AES algorithm to encrypt any given file and it also decrypt files that has encrypted using AES algorithm
4 | ....
5 | 


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/encrypt.py:
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  1 | import os, random
  2 | 
  3 | from Crypto.Cipher import AES
  4 | 
  5 | from Crypto.Hash import SHA256
  6 | 
  7 | import getpass
  8 | 
  9 | 
 10 | #encrypt Function
 11 | def encrypt(key, filename):
 12 | 
 13 | 	blocksize = 64*1024
 14 | 
 15 | 	Ofilename = "encrypted-"+filename #Set Output File Name
 16 | 	
 17 | 	#Zfill pads left in the string with zeros to complete the width 
 18 | 	filesize = str(os.path.getsize(filename)).zfill(16)
 19 | 	
 20 | 	#Initialization Vector
 21 | 	InitVector = ''
 22 | 
 23 | 
 24 | 
 25 | 	for i in range(16):
 26 | 
 27 | 		InitVector += chr(random.randint(0, 0xFF))
 28 | 
 29 | 
 30 | 
 31 | 	encryptor = AES.new(key, AES.MODE_CBC, InitVector)
 32 | 
 33 | 	
 34 | 	#open the file(rb-It reads the file in binary mode)
 35 | 	with open(filename, 'rb') as infile:
 36 | 
 37 | 		with open(Ofilename, 'wb') as outfile: #write the file in binary mode
 38 | 
 39 | 			outfile.write(filesize)
 40 | 
 41 | 			outfile.write(InitVector)
 42 | 
 43 | 			while True:
 44 | 
 45 | 				size = infile.read(blocksize)
 46 | 
 47 | 				
 48 | 
 49 | 				if len(size) == 0:
 50 | 
 51 | 					break
 52 | 
 53 | 				elif len(size) % 16 != 0:
 54 | 
 55 | 					size += ' ' * (16 - (len(size) % 16))
 56 | 
 57 | 				outfile.write(encryptor.encrypt(size))
 58 | 
 59 | 
 60 | 
 61 | 
 62 | 
 63 | def decrypt(key, filename):
 64 | 
 65 | 	blocksize = 64*1024
 66 | 
 67 | 	Ofilename = "Decrypted-"+filename #Set Output File Name
 68 | 
 69 | 	
 70 | 	#open the file(rb-It reads the file in binary mode)
 71 | 	with open(filename, 'rb') as infile:
 72 | 
 73 | 		filesize = long(infile.read(16))
 74 | 
 75 | 		InitVector = infile.read(16)
 76 | 
 77 | 
 78 | 
 79 | 		decryptor = AES.new(key, AES.MODE_CBC, InitVector)
 80 | 
 81 | 
 82 | 
 83 | 		with open(Ofilename, 'wb') as outfile:
 84 | 
 85 | 			while True:
 86 | 
 87 | 				size = infile.read(blocksize)
 88 | 
 89 | 
 90 | 
 91 | 				if len(size) == 0:
 92 | 
 93 | 					break
 94 | 
 95 | 
 96 | 
 97 | 				outfile.write(decryptor.decrypt(size))
 98 | 
 99 | 			outfile.truncate(filesize)
100 | 
101 | 
102 | 
103 | 
104 | 
105 | def getKey(password):
106 | 
107 | 	hasher = SHA256.new(password)
108 | 
109 | 	return hasher.digest()
110 | 
111 | 
112 | 
113 | def Main():
114 | 	print "***Advanced Encryption Standard (AES) is use to encrypt all files in this program***"
115 | 	print "*Enter E to Encrypt the File"
116 | 	print "*Enter D to Decrypt the File"
117 | 	choice = raw_input("Do you want to Encrypt or Decrypt?: ")
118 | 
119 | 
120 | 
121 | 	if choice == 'E':
122 | 
123 | 		filename = raw_input("Enter the File name: ")
124 | 		#print "Password :"
125 | 		
126 | 		#getting password without showing characters entered to the program
127 | 		password = getpass.getpass()
128 | 		print "Encrypting ..."
129 | 
130 | 		encrypt(getKey(password), filename)
131 | 
132 | 		print "Encryption Done."
133 | 
134 | 	elif choice == 'D':
135 | 
136 | 		filename = raw_input("Enter the File name: ")
137 | 
138 | 		password = getpass.getpass()
139 | 
140 | 		decrypt(getKey(password), filename)
141 | 
142 | 		print "Decryption Done."
143 | 
144 | 	else:
145 | 
146 | 		print "Wrong Input!!!"
147 | 
148 | 
149 | 
150 | if __name__ == '__main__':
151 | 
152 | 	Main()
153 | 
154 | 
155 | 
156 | 
157 | 
158 | 
159 | 


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