cbc-mode

I am implementing DES - CBC. I am confused as to what cipher.init , cipher.update and cipher.dofinal do. I just use init to set the key and dofinal to get the result. I don't use update. Is that correct? Also whats the difference to the result when using UTF-8 and ASCII encodings? Here is my code: byte[] ciphertext; Cipher enc = Cipher.getInstance("DES/CBC/PKCS5Padding"); enc.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "DES"), new IvParameterSpec(vector)); // Is this the complete ciphertext? ciphertext = encrypt.doFinal(data.getbytes("UTF-8")); The Javadoc for Cipher.doFinal(byte[]) says

I am writing a simple app to encrypt my message using AES / CBC (mode). As my understanding CBC mode requires IV parameter but I don't know why my code work without IV parameter used. Anyone can explain why? Thanks. The encrypted message printed: T9KdWxVZ5xStaisXn6llfg== without exception. public class TestAES { public static void main(String[] args) { try { byte[] salt = new byte[8]; new SecureRandom().nextBytes(salt); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); KeySpec keySpec = new PBEKeySpec("myPassword".toCharArray(), salt, 100, 128); SecretKey tmp =

I need to encrypt certainly string from client-side (JavaScript) and decrypt from server-side (Java), so I found CryptoJS and I write the code with the same params/configuration of mi Java Code but the output is always different, do you have any idea or what happen? I'm using CBC with NoPadding CryptoJS http://jsfiddle.net/Soldier/gCHAG/ <script src="http://crypto-js.googlecode.com/svn/tags/3.1.2/build/rollups/aes.js"> </script> <script src="http://crypto-js.googlecode.com/svn/tags/3.1.2/build/components/pad-nopadding-min.js"></script> <script> function padString(source) { var paddingChar = '

I have been trying to implement AES CBC decryption in Python. Since the ciphered text is not a multiple of 16bytes, padding was necessary. Without padding, this error surfaced "TypeError: Odd-length string" But I could not find a proper reference for implementing PKCS5 in PyCrypto Python. Are there any commands to implement this? Thanks After looking into Marcus's suggestion I did this. My goal actually is to decrypt a hex message(128bytes) using this code. However, the output is " ?:" which is very small and the unpad command is deleting those bytes. This is the code. from Crypto.Cipher

I am writing a code to encrypt and decrypt with crypto++ library .I found a code to encrypt and decrypt which is shown below.The code works OK as one program.but when I divide into two c++ programs (One for encryption and another for decryption) the decryption pargram gives me error terminate called after throwing an instance of 'CryptoPP::InvalidCiphertext' what(): StreamTransformationFilter: ciphertext length is not a multiple of block size The ciphertext I get after encryption is ���z=(f�����P%���2��W3�p�H�����^��@C��#������bp���nx�� which I transfer into the decryption code. What am I

Consider the following snippet of C++ code: #include <iostream> #include <openssl/aes.h> #define AES_KEY_LENGTH 32 using namespace std; int main() { AES_KEY encryption_key; AES_KEY decryption_key; unsigned char key[AES_KEY_LENGTH] = {'t', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't'}; unsigned char iv[AES_BLOCK_SIZE] = {'t', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't', 't', 'e', 's', 't'}; unsigned char iv_enc[AES_BLOCK_SIZE]; unsigned char iv_dec[AES_BLOCK_SIZE]; memcpy(iv