cbc-mode

Skipping elif statement?

由 早过忘川 提交于 2019-12-25 16:23:10
问题 Am trying to create a simple encryption/decryption using pycryptodome but keeping getting the following error: ValueError: Error 3 while encrypting in CBC mode after some digging I saw that you get this error if there is not enough data to encrypt, as in there is no padding in effect. The thing is that I've added a padding function. After debugging it seems as if my code literally skips the padding part completely and causes this error. What am I doing wrong? import os, random from Crypto

Decrypt MCRYPT_RIJNDAEL_256 with 32-byte initialization vectors with PyCrypto

由 て烟熏妆下的殇ゞ 提交于 2019-12-23 20:58:46
问题 I have data that was encrypted in PHP as follows: mcrypt_encrypt(MCRYPT_RIJNDAEL_256, SECRET, $data, MCRYPT_MODE_CBC, $iv) I need to decrypt this data in a Python 3 application. I am trying to use PyCrypto but I am open to other libraries. I expect the following to work: decryptor = AES.new(key, mode, IV=IV) plain = decryptor.decrypt(ciphertext) My initialization vector is 32 bytes, and the following exception is thrown: ValueError: IV must be 16 bytes long How can I set PyCrypto to use a 32

PHP implementing Ciphertext Stealing (CTS) with CBC

由 大兔子大兔子 提交于 2019-12-22 10:06:04
问题 I have been trying to implement Ciphertext Stealing(CTS) in PHP for CBC. Referring below two links How can I encrypt/decrypt data using AES CBC+CTS (ciphertext stealing) mode in PHP? and http://en.wikipedia.org/wiki/Ciphertext_stealing I am confused and stuck on the last and simplest step of XOR. I know this is silly but having tried all the combinations, i don't know what am i missing. Code follows. // 1. Decrypt the second to last ciphertext block, using zeros as IV. $second_to_last_cipher

Does AES/CBC really requires IV parameter?

由 蹲街弑〆低调 提交于 2019-12-21 04:59:05
问题 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(

AES decryption padding with PKCS5 Python

由 ≡放荡痞女 提交于 2019-12-20 08:30:57
问题 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

Golang: How do I encrypt plain text that is 5 characters long with DES and CBC?

由 二次信任 提交于 2019-12-09 14:17:32
问题 Currently trying to encrypt plaintext that is 5 characters long into a 12 character encrypted string. I want to be able to specify a unique IV (not randomly generated), a unique key, and use DES. My current code requires the plaintext to be 8 characters long (5 character name plus 3 spaces). 回答1: I have already faced this problem. This is because of padding issue. The code you wanted is a Code link You Can test it at go playground. package main import ( "crypto/cipher" "crypto/des" "encoding

Different output encryption both CryptoJS and Java Code

由 ⅰ亾dé卋堺 提交于 2019-12-09 07:22:11
问题 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

How to decrypt aes-256-cbc in Java

由 十年热恋 提交于 2019-12-08 03:04:14
问题 I have encrypted the string in php. Decrypted successfully from php and node.js. In addition, it must be decrypted by java. Help me an example of decrypting from java? PHP Encrypt code /* encrypt */ $encryption_method = 'aes-256-cbc'; $secretHash = "d95acd54c6a821ff32c52825b931c194"; $iv_size = openssl_cipher_iv_length($encryption_method); $iv = openssl_random_pseudo_bytes($iv_size); //encrypt $encryptedMessage = openssl_encrypt($new_token, $encryption_method, $secretHash, 0, $iv); /

How to decrypt aes-256-cbc in Java

由 ぐ巨炮叔叔 提交于 2019-12-06 07:37:35
I have encrypted the string in php. Decrypted successfully from php and node.js. In addition, it must be decrypted by java. Help me an example of decrypting from java? PHP Encrypt code /* encrypt */ $encryption_method = 'aes-256-cbc'; $secretHash = "d95acd54c6a821ff32c52825b931c194"; $iv_size = openssl_cipher_iv_length($encryption_method); $iv = openssl_random_pseudo_bytes($iv_size); //encrypt $encryptedMessage = openssl_encrypt($new_token, $encryption_method, $secretHash, 0, $iv); //Concatenate iv with data $ciphertext = bin2hex($iv).$encryptedMessage; /* decrypt the cipher */ $iv_size =

PHP implementing Ciphertext Stealing (CTS) with CBC

由 核能气质少年 提交于 2019-12-05 19:55:40
I have been trying to implement Ciphertext Stealing(CTS) in PHP for CBC. Referring below two links How can I encrypt/decrypt data using AES CBC+CTS (ciphertext stealing) mode in PHP? and http://en.wikipedia.org/wiki/Ciphertext_stealing I am confused and stuck on the last and simplest step of XOR. I know this is silly but having tried all the combinations, i don't know what am i missing. Code follows. // 1. Decrypt the second to last ciphertext block, using zeros as IV. $second_to_last_cipher_block = substr($cipher_text, strlen($cipher_text) - 32, 16); $second_to_last_plain = @mcrypt_decrypt
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