Dart

3DES Encryption, ECB, CBC modes

See more Encryption Examples

3DES encryption. The Chilkat encryption component supports Triple-DES in both ECB (Electronic Cookbook) and CBC (Cipher-Block Chaining) cipher modes. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final crypt = CkCrypt2();

  // Specify 3DES for the encryption algorithm:
  crypt.cryptAlgorithm = '3des';

  // CipherMode may be "ecb" or "cbc"
  crypt.cipherMode = 'cbc';

  // KeyLength must be 192.  3DES is technically 168-bits;
  // the most-significant bit of each key byte is a parity bit,
  // so we must indicate a KeyLength of 192, which includes
  // the parity bits.
  crypt.keyLength = 192;

  // The padding scheme determines the contents of the bytes
  // that are added to pad the result to a multiple of the
  // encryption algorithm's block size.  3DES has a block
  // size of 8 bytes, so encrypted output is always
  // a multiple of 8.
  crypt.paddingScheme = 0;

  // EncodingMode specifies the encoding of the output for
  // encryption, and the input for decryption.
  // It may be "hex", "url", "base64", or "quoted-printable".
  crypt.encodingMode = 'hex';

  // An initialization vector is required if using CBC or CFB modes.
  // ECB mode does not use an IV.
  // The length of the IV is equal to the algorithm's block size.
  // It is NOT equal to the length of the key.
  final ivHex = '0001020304050607';
  crypt.setEncodedIV(ivHex, 'hex');

  // The secret key must equal the size of the key.  For 
  // 3DES, the key must be 24 bytes (i.e. 192-bits).
  final keyHex = '000102030405060708090A0B0C0D0E0F0001020304050607';
  crypt.setEncodedKey(keyHex, 'hex');

  // Encrypt a string...
  // The input string is 44 ANSI characters (i.e. 44 bytes), so
  // the output should be 48 bytes (a multiple of 8).
  // Because the output is a hex string, it should
  // be 96 characters long (2 chars per byte).
  final encStr = crypt.encryptStringENC('The quick brown fox jumps over the lazy dog.');
  print(encStr);

  // Now decrypt:
  final decStr = crypt.decryptStringENC(encStr);
  print(decStr);
}