Skipjack ExampleThis is a private key encryption algorithm, designed by NSA. [Theory] Encrypted (Base-64) Encrypted (Hex) Decrypted |
Code Used
public string SkipjackEngine(string plain, string key) { BCEngine bcEngine = new BCEngine(new BlowfishEngine(), Encoding.ASCII); bcEngine.SetPadding(new Pkcs7Padding()); return bcEngine.Encrypt(plain, key); } public string SkipjackEngine(string cipher, string key) { BCEngine bcEngine = new BCEngine(new BlowfishEngine(), Encoding.ASCII); bcEngine.SetPadding(new Pkcs7Padding()); return bcEngine.Decrypt(cipher, key); } // Based on http://elian.co.uk/post/2009/07/29/Bouncy-Castle-CSharp.aspx public class BCEngine { private readonly Encoding _encoding; private readonly IBlockCipher _blockCipher; private Org.BouncyCastle.Crypto.Paddings.PaddedBufferedBlockCipher _cipher; private Org.BouncyCastle.Crypto.Paddings.IBlockCipherPadding _padding; public BCEngine(IBlockCipher blockCipher, Encoding encoding) { _blockCipher = blockCipher; _encoding = encoding; } public void SetPadding(IBlockCipherPadding padding) { if (padding != null) _padding = padding; } public string Encrypt(string plain, string key) { byte[] result = BouncyCastleCrypto(true, _encoding.GetBytes(plain), key); return Convert.ToBase64String(result); } public string Decrypt(string cipher, string key) { byte[] result = BouncyCastleCrypto(false, Convert.FromBase64String(cipher), key); return _encoding.GetString(result); } private byte[] BouncyCastleCrypto(bool forEncrypt, byte[] input, string key) { try { _cipher = _padding == null ? new PaddedBufferedBlockCipher(_blockCipher) : new PaddedBufferedBlockCipher(_blockCipher, _padding); int paddingchar = 16 - key.Length; for (int i = 0; i < paddingchar; i++) { key += " "; } key=key.Substring(0,16); byte[] keyByte = _encoding.GetBytes(key); _cipher.Init(forEncrypt, new KeyParameter(keyByte)); return _cipher.DoFinal(input); } catch (Org.BouncyCastle.Crypto.CryptoException ex) { // throw new CryptoException(ex); } return null; }