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(Ruby) AES 256-bit CBC using PBKDF2 Generated Secret KeySee more Encryption ExamplesFirst generates a 32-byte secret key using PBKDF2 (with HMAC-SHA256), and then uses the secret key to do 256-bit AES CBC mode decryption. (Duplicates the following Java code) public String decrypt(String strToDecrypt) { try { // Read the initialization vector from the first bytes for the data byte [] rawData = Base64.getDecoder().decode(strToDecrypt); byte [] iv = new byte[Config.get().encryptionIVLength()]; byte [] encryptedData = new byte[rawData.length - iv.length]; System.arraycopy(rawData, 0, iv, 0, iv.length); System.arraycopy(rawData, iv.length, encryptedData, 0, encryptedData.length); IvParameterSpec ivspec = new IvParameterSpec(iv); SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256"); KeySpec spec = new PBEKeySpec(secretKey.toCharArray(), salt.getBytes(), 65536, 256); SecretKey tmp = factory.generateSecret(spec); SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING"); cipher.init(Cipher.DECRYPT_MODE, secretKey, ivspec); return new String(cipher.doFinal(encryptedData)); } catch (Exception e) { log.error("Could not decrypt the string.", e); } return null; }
require 'chilkat' # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. crypt = Chilkat::CkCrypt2.new() password = "some arbitrary length password" # We have 8 bytes of salt encoded using hex. # (The salt can be any number of bytes, in any desired encoding such as base64, hex, etc.) saltHex = "0102030405060708" # Generate the 256-bit (32-byte) AES secret key we'll use to decrypt. iterationCount = 65536 outputKeyBitLen = 256 secretKeyHex = crypt.pbkdf2(password,"utf-8","sha256",saltHex,iterationCount,outputKeyBitLen,"hex") # Setup for 256-bit AES CBC decryption. crypt.put_CryptAlgorithm("aes") crypt.put_KeyLength(256) crypt.put_CipherMode("cbc") crypt.put_PaddingScheme(0) # The IV for AES is 16 bytes. iv = "000102030405060708090A0B0C0D0E0F" crypt.SetEncodedIV(iv,"hex") # Set the secret key for 256-bit AES. crypt.SetEncodedKey(secretKeyHex,"hex") # AES decrypt # assume our string to decrypt is base64 strToDecrypt = "...." crypt.put_EncodingMode("base64") decryptedStr = crypt.decryptStringENC(strToDecrypt) print decryptedStr + "\n"; |
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