public static void Main(string[] args) { string cube3File = null; string scriptFile = null; if (args.Length > 0) { cube3File = args[0]; if (args.Length > 1) { scriptFile = args[1]; } } if (cube3File == null) { System.Console.WriteLine("usage: c3sg <cube3File> [<scriptFile>]"); System.Console.WriteLine(""); System.Console.WriteLine("c3sg reads cube3File and generates a script file. Will generate file"); System.Console.WriteLine("in specified scriptFile or in a file with the same name as the Cube3 File,"); System.Console.WriteLine("but with the extension CUBESCR"); System.Console.WriteLine(""); Environment.Exit(0); } if (scriptFile == null) { scriptFile = Path.GetFileNameWithoutExtension(cube3File) + ".CUBESCR"; } engine = new BlowfishEngine(true); generateScriptFromCube3File(cube3File, scriptFile); }
public void saveKeysToFiles() { //save keys of a new user to files using (FileStream fs = File.Create(MainWindow.publicKeysPath + "\\" + Email + ".txt")) { Byte[] info = new UTF8Encoding(true).GetBytes(publicKey); fs.Write(info, 0, info.Length); } using (FileStream fs = File.Create(MainWindow.privateKeysPath + "\\" + Email + ".txt")) { Byte[] privateKeyBytes = new UTF8Encoding(true).GetBytes(privateKey); string key = computeSha256Hash(password); //hashed password BlowfishEngine engine = new BlowfishEngine(); PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(engine); //ECB KeyParameter keyBytes = new KeyParameter(Encoding.UTF8.GetBytes(key)); cipher.Init(true, keyBytes); encPrivateKey = new byte[cipher.GetOutputSize(privateKeyBytes.Length)]; int len1 = cipher.ProcessBytes(privateKeyBytes, 0, privateKeyBytes.Length, encPrivateKey, 0); //private key encrypted with hashed password cipher.DoFinal(encPrivateKey, len1); fs.Write(encPrivateKey, 0, encPrivateKey.Length); } }
/** * @param blowfishKey */ public NewCrypt(byte[] blowfishKey) { _crypt = new BlowfishEngine(); _crypt.init(true, blowfishKey); _decrypt = new BlowfishEngine(); _decrypt.init(false, blowfishKey); }
public void TestFunction() { string resultText = Perform().ToString(); BlowfishEngine blowfish = new BlowfishEngine(); // key range check try { blowfish.Init(true, new KeyParameter(new byte[1])); Fail("no exception"); } catch (ArgumentException e) { Assert.AreEqual("key length must be in range 32 to 448 bits", e.Message); } try { blowfish.Init(true, new KeyParameter(new byte[59])); Fail("no exception"); } catch (ArgumentException e) { Assert.AreEqual("key length must be in range 32 to 448 bits", e.Message); } Assert.AreEqual(Name + ": Okay", resultText); }
/// <summary> /// After being initialized with a key, the schedule (p-array) and s-boxes needs some /// work from the Blowfish engine to finish setting up. /// </summary> void Setup() { // The setup process starts with the all zero string. UInt64 bitScape = 0; // To set up the schedule (p-arrays), for (int i = 0; i < 9; i++) { bitScape = BlowfishEngine.Encrypt(ByteOperations.Swap(bitScape), this); Schedule.Set(i * 2, ByteOperations.Left(bitScape)); Schedule.Set(i * 2 + 1, ByteOperations.Right(bitScape)); bitScape = ByteOperations.Swap(bitScape); } // To finish the s-boxes for (int i = 0; i < 1024;) { bitScape = BlowfishEngine.Encrypt(ByteOperations.Swap(bitScape), this); sbox[i / 256, i % 256] = ByteOperations.Left(bitScape); i++; sbox[i / 256, i % 256] = ByteOperations.Right(bitScape); i++; bitScape = ByteOperations.Swap(bitScape); } }
public static void Main(string[] args) { string cube3File = null; string bfbFile = null; if (args.Length > 0) { bfbFile = args[0]; if (args.Length > 1) { cube3File = args[1]; } } if (bfbFile == null) { System.Console.WriteLine("usage: cube3Encoder <bfbFile> [<Cube3File>]"); System.Console.WriteLine(""); System.Console.WriteLine("cube3Encoder reads bfbFile and encodes into Cube3File. Will generate"); System.Console.WriteLine("into specified Cube3File or a file with the same name as the BFB File,"); System.Console.WriteLine("but with the extension Cube3"); System.Console.WriteLine(""); Environment.Exit(0); } if (cube3File == null) { cube3File = Path.GetFileNameWithoutExtension(bfbFile) + ".Cube3"; } engine = new BlowfishEngine(true); generateCube3FromBFBFile(bfbFile, cube3File); }
public NewCrypt(string key) { byte[] blowfishKey = Encoding.UTF8.GetBytes(key); _crypt = new BlowfishEngine(); _crypt.init(true, blowfishKey); _decrypt = new BlowfishEngine(); _decrypt.init(false, blowfishKey); }
public CryptoEngine(Window window, FileManager fileManager) { this.window = window; this.fileManager = fileManager; engine = new BlowfishEngine(); iv = null; subBlockLength = 1; }
public static void Main(string[] args) { int cube3FileIndex = 0; int bfbFileIndex = 1; bool xmlMode = false; string cube3File = null; string bfbFile = null; if (args.Length > 0) { if (args[0].StartsWith("-") || args[0].StartsWith("/")) { cube3FileIndex++; bfbFileIndex++; if (args[0].ToUpper().Equals("-XML")) { xmlMode = true; } else { System.Console.WriteLine($"Invalid parameter {args[0]}!"); System.Console.WriteLine(""); displayHelp(); Environment.Exit(-1); } } cube3File = args[cube3FileIndex]; if (args.Length > bfbFileIndex) { bfbFile = args[bfbFileIndex]; } } if (cube3File == null) { displayHelp(); Environment.Exit(0); } if (bfbFile == null) { if (!xmlMode) { bfbFile = Path.GetFileNameWithoutExtension(cube3File) + ".BFB"; } else { bfbFile = Path.GetFileNameWithoutExtension(cube3File) + ".XML"; } } engine = new BlowfishEngine(); engine.UseLittleEndian = true; generateBFBFromCube3File(cube3File, bfbFile, xmlMode); }
const string KEY = "wHcnqpHNN"; // "STINGMIMI"; public static string Decode4odToken(string token) { byte[] encryptedBytes = Convert.FromBase64String(token); BlowfishEngine bf = new BlowfishEngine(); bf.Init(false, new KeyParameter(Encoding.ASCII.GetBytes(KEY))); byte[] decryptedBytes = decrypt(encryptedBytes, bf); return(Encoding.ASCII.GetString(decryptedBytes)); }
static void Main(string[] args) { BlowfishEngine engine = new BlowfishEngine(); RestClient client = new RestClient("http://spectator.na.lol.riotgames.com:80/observer-mode/rest/"); JSON.Deserialize <Game[]>( JSON.DeserializeDynamic( client.Execute(new RestRequest("featured", Method.GET)).Content ).gameList ); }
private string decryptPath(string path) { byte[] value = StringToBytes(path); BlowfishEngine bf = new BlowfishEngine(); byte[] key1 = new byte[7] { 107, 108, 117, 99, 122, 121, 107 }; bf.Init(true, new KeyParameter(key1)); decrypt(value, bf); return(Encoding.ASCII.GetString(value)); }
//private private static byte[] encryptDecrypt(byte[] input, byte[] key, byte[] iv, BlockMode mode, BlockPadding padding, bool encrypt) { BlowfishEngine engine = new BlowfishEngine(); IBlockCipher cipherMode; BufferedBlockCipher cipher; KeyParameter keyP = new KeyParameter(key); ParametersWithIV keyParams = new ParametersWithIV(keyP, iv); if (mode == BlockMode.CBC) { cipherMode = new CbcBlockCipher(engine); } else if (mode == BlockMode.CFB) { cipherMode = new CfbBlockCipher(engine, iv.Length); } else if (mode == BlockMode.OFB) { cipherMode = new OfbBlockCipher(engine, iv.Length); } else { throw new Exception("mode must be a valid BlockMode."); } if (padding == BlockPadding.PKCS7Padding) { cipher = new PaddedBufferedBlockCipher(cipherMode, new Pkcs7Padding()); } else if (padding == BlockPadding.ZeroBytePadding) { cipher = new PaddedBufferedBlockCipher(cipherMode, new ZeroBytePadding()); } else if (padding == BlockPadding.NoPadding) { cipher = new BufferedBlockCipher(cipherMode); } else { throw new Exception("padding must be a valid BlockPadding."); } cipher.Init(encrypt, keyParams); byte[] output = new byte[cipher.GetOutputSize(input.Length)]; int length = cipher.ProcessBytes(input, output, 0); cipher.DoFinal(output, length); return(output); }
public void decryptPrivateKey(string keyString) { //decrypt private key with key = user password hashed with SHA-256 BlowfishEngine engine = new BlowfishEngine(); PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(engine); StringBuilder result = new StringBuilder(); cipher.Init(false, new KeyParameter(Encoding.UTF8.GetBytes(keyString))); byte[] out2 = new byte[cipher.GetOutputSize(encPrivateKey.Length)]; int len2 = cipher.ProcessBytes(encPrivateKey, 0, encPrivateKey.Length, out2, 0); cipher.DoFinal(out2, len2); this.privateKey = Encoding.UTF8.GetString(out2); }
public string Encrypt(string plainText, string key) { var engine = new BlowfishEngine(); var cipher = new PaddedBufferedBlockCipher(engine); var keyBytes = new KeyParameter(Encoding.UTF8.GetBytes(key)); cipher.Init(true, keyBytes); var plainBytes = Encoding.UTF8.GetBytes(plainText); var result = new byte[cipher.GetOutputSize(plainBytes.Length)]; var length = cipher.ProcessBytes(plainBytes, 0, plainBytes.Length, result, 0); cipher.DoFinal(result, length); var base64 = Convert.ToBase64String(result); return(base64); }
static byte[] decrypt(byte[] byteArray, BlowfishEngine bf) { int blockSize = 8; List <byte> decrypted = new List <byte>(); for (int i = 0; i < byteArray.Length; i = i + blockSize) { byte[] blockBytes = new byte[blockSize]; byte[] outBytes = new byte[blockSize]; for (int j = 0; j < blockSize; j++) { blockBytes[j] = byteArray[i + j]; } bf.ProcessBlock(blockBytes, 0, outBytes, 0); decrypted.AddRange(outBytes); } unpad(decrypted); return(decrypted.ToArray()); }
/// <summary> /// Encrypted the data. /// </summary> /// <param name="data">The data to encrypted.</param> /// <param name="passphrase">The passphrase key used to mask the data.</param> /// <returns>The encrypted data.</returns> public byte[] Encrypt(byte[] data, string passphrase) { // Create the key parameters. byte[] key = Encoding.Default.GetBytes(passphrase); Key.Crypto.Parameters.KeyParameter keyParameter = new KeyParameter(key); // Initialise the cryptography engine. Key.Crypto.Engines.BlowfishEngine blowfish = new BlowfishEngine(); blowfish.Init(true, keyParameter); int dataLength = data.Length; int blockSize = blowfish.GetBlockSize(); int modBlockSize = dataLength % blockSize; int blockCount = dataLength / blockSize; // If there is a remained then add en extra block count. if ((modBlockSize) > 0) { // Add one extra block. blockCount++; } // Encrypted data store. byte[] encryptedData = new byte[blockCount * blockSize]; byte[] decryptedData = new byte[blockCount * blockSize]; // Copy the decrypted data. for (int j = 0; j < dataLength; j++) { // Assign the data. decryptedData[j] = data[j]; } // For each block size in the the data. for (int i = 0; i < blockCount; i++) { // Encrypt the block. blowfish.ProcessBlock(decryptedData, (i * blockSize), encryptedData, (i * blockSize)); } // Return the encrypted data. return(encryptedData); }
public static ArrayLease <byte> DecryptBytes(ArraySegment <byte> ciphertext, ArraySegment <byte> key, out int count) { // Blowfish processes things in blocks of 8, so // it doesn't make sense to have a non-multiple // of 8 length ciphertext (TODO: right?) if ((ciphertext.Count & 7) != 0) // ciphertext.Count % 8 != 0 { // TODO: Have a Strings.resx file for this // Does project.json support that? / What benefits will that yield? throw new ArgumentException( message: "The length of the ciphertext needs to be divisible by 8.", paramName: nameof(ciphertext)); } // Since there's guaranteed to be no leftover, // the count is just ciphertext.Count count = ciphertext.Count; var engine = new BlowfishEngine(); var keyParameter = new KeyParameter(key.Array, key.Offset, key.Count); engine.Init(forEncryption: false, parameters: keyParameter); var lease = ArrayPool <byte> .Shared.Lease(count); try { var encryptBuffer = ciphertext.Array; var decryptBuffer = lease.Array; for (int i = 0; i < count; i += 8) { engine.ProcessBlock(encryptBuffer, ciphertext.Offset + i, decryptBuffer, i); } } catch { lease.Dispose(); throw; } return(lease); }
public byte[] BlowfishEncrypt(byte[] contentBytes, string key) { try { //create blowfish engine BlowfishEngine engine = new BlowfishEngine(); //create block cipher based on user choice PaddedBufferedBlockCipher cipher = null; switch (encryptTypes[encryptTypeIndex]) { case "ECB": cipher = new PaddedBufferedBlockCipher(engine); break; case "CBC": cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(engine)); break; case "CFB": cipher = new PaddedBufferedBlockCipher(new CfbBlockCipher(engine, blockSize)); break; case "OFB": cipher = new PaddedBufferedBlockCipher(new OfbBlockCipher(engine, blockSize)); break; } //create key KeyParameter keyBytes = new KeyParameter(Encoding.GetBytes(key)); cipher.Init(true, keyBytes); //create byte array for encrypted data byte[] outB = new byte[cipher.GetOutputSize(contentBytes.Length)]; int len1 = cipher.ProcessBytes(contentBytes, 0, contentBytes.Length, outB, 0); cipher.DoFinal(outB, len1); return(outB); } catch (Exception) { return(null); } }
public string EncryptWithBouncyCastle( string token, string encryptionKey ) { IBlockCipher blowFishCipher = new BlowfishEngine(); PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(blowFishCipher); cipher.Init(true, new KeyParameter(Base64.Decode(encryptionKey))); var encoder = new ASCIIEncoding(); byte[] tokenBytes = encoder.GetBytes(token); byte[] encryptedTokenBytes = cipher.DoFinal(tokenBytes); var encryptedToken = Convert.ToBase64String(encryptedTokenBytes); return(encryptedToken); }
private static byte[] DecryptChunks(byte[] downloadBytes, long streamLength, byte[] keyBytes) { var decryptedBytes = new byte[streamLength]; var chunkSize = 2048; var progress = 0; while (progress < streamLength) { if (streamLength - progress < 2048) { chunkSize = (int)streamLength - progress; } var encryptedChunk = new byte[chunkSize]; Buffer.BlockCopy(downloadBytes, progress, encryptedChunk, 0, chunkSize); // this will only decrypt every third chunk and if it's not at the end if (progress % (chunkSize * 3) == 0 && chunkSize == 2048) { var blowfishEngine = new BlowfishEngine(); var cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(blowfishEngine), new ZeroBytePadding()); var keyParameter = new KeyParameter(keyBytes); var parameters = new ParametersWithIV(keyParameter, new byte[] { 0, 1, 2, 3, 4, 5, 6, 7 }); cipher.Init(false, parameters); var output = new byte[cipher.GetOutputSize(encryptedChunk.Length)]; int len = cipher.ProcessBytes(encryptedChunk, 0, encryptedChunk.Length, output, 0); cipher.DoFinal(output, len); Buffer.BlockCopy(output, 0, encryptedChunk, 0, output.Length); } Buffer.BlockCopy(encryptedChunk, 0, decryptedBytes, progress, encryptedChunk.Length); progress += chunkSize; } return(decryptedBytes); }
private void decrypt(byte[] value, BlowfishEngine bf) { int blockSize = bf.GetBlockSize(); byte[] vector = new byte[blockSize]; for (int i = 0; i < blockSize; i++) { vector[i] = 0; } for (int i = 0; i < value.Length; i += blockSize) { byte[] tmp = new byte[blockSize]; bf.ProcessBlock(vector, 0, tmp, 0); int chunk = Math.Min(blockSize, value.Length - i); for (int j = 0; j < chunk; j++) { vector[j] = value[i + j]; value[(i + j)] = (byte)(value[(i + j)] ^ tmp[j]); } ; } ; }
static private string BlowfishEncrypt(string strValue, string key) { try { Encoding encoding = Encoding.UTF8; BlowfishEngine engine = new BlowfishEngine(); PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(engine); cipher.Init(true, new KeyParameter(encoding.GetBytes(key))); byte[] inn = encoding.GetBytes(strValue); byte[] outt = new byte[cipher.GetOutputSize(inn.Length)]; int len1 = cipher.ProcessBytes(inn, 0, inn.Length, outt, 0); cipher.DoFinal(outt, len1); return(BitConverter.ToString(outt).Replace("-", "")); } catch (Exception) { return(""); } }
public byte[] BlowfishDecrypt(byte[] contentBytes, string keyString, string cipherMode) { //create blowfish engine BlowfishEngine engine = new BlowfishEngine(); //create block cipher based on user choice PaddedBufferedBlockCipher cipher = null; switch (cipherMode) { case "ECB": cipher = new PaddedBufferedBlockCipher(engine); break; case "CBC": cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(engine)); break; case "CFB": cipher = new PaddedBufferedBlockCipher(new CfbBlockCipher(engine, blockSize)); break; case "OFB": cipher = new PaddedBufferedBlockCipher(new OfbBlockCipher(engine, blockSize)); break; } StringBuilder result = new StringBuilder(); cipher.Init(false, new KeyParameter(Encoding.GetBytes(keyString))); byte[] out2 = new byte[cipher.GetOutputSize(contentBytes.Length)]; int len2 = cipher.ProcessBytes(contentBytes, 0, contentBytes.Length, out2, 0); cipher.DoFinal(out2, len2); return(out2); }
private static byte[] ProcessData(byte[] data, byte[] key, bool forEncryption) { byte[] input = data; bool paddingRequired = data.Length % BlockSize > 0; if (paddingRequired) { input = new byte[data.Length + BlockSize - data.Length % BlockSize]; Buffer.BlockCopy(data, 0, input, 0, data.Length); } byte[] output = new byte[input.Length]; BlowfishEngine engine = new BlowfishEngine(); engine.Init(forEncryption, key); int offset = 0; while (offset < input.Length) { engine.ProcessBlock(input, offset, output, offset); offset += BlockSize; } if (paddingRequired) { byte[] unpaddedOutput = new byte[data.Length]; Buffer.BlockCopy(output, 0, unpaddedOutput, 0, unpaddedOutput.Length); return(unpaddedOutput); } return(output); }
public static IBufferedCipher GetCipher( string algorithm) { if (algorithm == null) { throw new ArgumentNullException("algorithm"); } algorithm = Platform.ToUpperInvariant(algorithm); { string aliased = (string)algorithms[algorithm]; if (aliased != null) { algorithm = aliased; } } IBasicAgreement iesAgreement = null; if (algorithm == "IES") { iesAgreement = new DHBasicAgreement(); } else if (algorithm == "ECIES") { iesAgreement = new ECDHBasicAgreement(); } if (iesAgreement != null) { return(new BufferedIesCipher( new IesEngine( iesAgreement, new Kdf2BytesGenerator( new Sha1Digest()), new HMac( new Sha1Digest())))); } if (Platform.StartsWith(algorithm, "PBE")) { if (Platform.EndsWith(algorithm, "-CBC")) { if (algorithm == "PBEWITHSHA1ANDDES-CBC") { return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new DesEngine()))); } else if (algorithm == "PBEWITHSHA1ANDRC2-CBC") { return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new RC2Engine()))); } else if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND2-KEYTRIPLEDES-CBC", "PBEWITHSHAAND3-KEYTRIPLEDES-CBC")) { return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new DesEdeEngine()))); } else if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND128BITRC2-CBC", "PBEWITHSHAAND40BITRC2-CBC")) { return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new RC2Engine()))); } } else if (Platform.EndsWith(algorithm, "-BC") || Platform.EndsWith(algorithm, "-OPENSSL")) { if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND128BITAES-CBC-BC", "PBEWITHSHAAND192BITAES-CBC-BC", "PBEWITHSHAAND256BITAES-CBC-BC", "PBEWITHSHA256AND128BITAES-CBC-BC", "PBEWITHSHA256AND192BITAES-CBC-BC", "PBEWITHSHA256AND256BITAES-CBC-BC", "PBEWITHMD5AND128BITAES-CBC-OPENSSL", "PBEWITHMD5AND192BITAES-CBC-OPENSSL", "PBEWITHMD5AND256BITAES-CBC-OPENSSL")) { return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new AesFastEngine()))); } } } string[] parts = algorithm.Split('/'); IBlockCipher blockCipher = null; IAsymmetricBlockCipher asymBlockCipher = null; IStreamCipher streamCipher = null; string algorithmName = parts[0]; { string aliased = (string)algorithms[algorithmName]; if (aliased != null) { algorithmName = aliased; } } CipherAlgorithm cipherAlgorithm; try { cipherAlgorithm = (CipherAlgorithm)Enums.GetEnumValue(typeof(CipherAlgorithm), algorithmName); } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } switch (cipherAlgorithm) { case CipherAlgorithm.AES: blockCipher = new AesFastEngine(); break; case CipherAlgorithm.ARC4: streamCipher = new RC4Engine(); break; case CipherAlgorithm.BLOWFISH: blockCipher = new BlowfishEngine(); break; case CipherAlgorithm.CAMELLIA: blockCipher = new CamelliaEngine(); break; case CipherAlgorithm.CAST5: blockCipher = new Cast5Engine(); break; case CipherAlgorithm.CAST6: blockCipher = new Cast6Engine(); break; case CipherAlgorithm.DES: blockCipher = new DesEngine(); break; case CipherAlgorithm.DESEDE: blockCipher = new DesEdeEngine(); break; case CipherAlgorithm.ELGAMAL: asymBlockCipher = new ElGamalEngine(); break; case CipherAlgorithm.GOST28147: blockCipher = new Gost28147Engine(); break; case CipherAlgorithm.HC128: streamCipher = new HC128Engine(); break; case CipherAlgorithm.HC256: streamCipher = new HC256Engine(); break; case CipherAlgorithm.IDEA: blockCipher = new IdeaEngine(); break; case CipherAlgorithm.NOEKEON: blockCipher = new NoekeonEngine(); break; case CipherAlgorithm.PBEWITHSHAAND128BITRC4: case CipherAlgorithm.PBEWITHSHAAND40BITRC4: streamCipher = new RC4Engine(); break; case CipherAlgorithm.RC2: blockCipher = new RC2Engine(); break; case CipherAlgorithm.RC5: blockCipher = new RC532Engine(); break; case CipherAlgorithm.RC5_64: blockCipher = new RC564Engine(); break; case CipherAlgorithm.RC6: blockCipher = new RC6Engine(); break; case CipherAlgorithm.RIJNDAEL: blockCipher = new RijndaelEngine(); break; case CipherAlgorithm.RSA: asymBlockCipher = new RsaBlindedEngine(); break; case CipherAlgorithm.SALSA20: streamCipher = new Salsa20Engine(); break; case CipherAlgorithm.SEED: blockCipher = new SeedEngine(); break; case CipherAlgorithm.SERPENT: blockCipher = new SerpentEngine(); break; case CipherAlgorithm.SKIPJACK: blockCipher = new SkipjackEngine(); break; case CipherAlgorithm.TEA: blockCipher = new TeaEngine(); break; case CipherAlgorithm.THREEFISH_256: blockCipher = new ThreefishEngine(ThreefishEngine.BLOCKSIZE_256); break; case CipherAlgorithm.THREEFISH_512: blockCipher = new ThreefishEngine(ThreefishEngine.BLOCKSIZE_512); break; case CipherAlgorithm.THREEFISH_1024: blockCipher = new ThreefishEngine(ThreefishEngine.BLOCKSIZE_1024); break; case CipherAlgorithm.TNEPRES: blockCipher = new TnepresEngine(); break; case CipherAlgorithm.TWOFISH: blockCipher = new TwofishEngine(); break; case CipherAlgorithm.VMPC: streamCipher = new VmpcEngine(); break; case CipherAlgorithm.VMPC_KSA3: streamCipher = new VmpcKsa3Engine(); break; case CipherAlgorithm.XTEA: blockCipher = new XteaEngine(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } if (streamCipher != null) { if (parts.Length > 1) { throw new ArgumentException("Modes and paddings not used for stream ciphers"); } return(new BufferedStreamCipher(streamCipher)); } bool cts = false; bool padded = true; IBlockCipherPadding padding = null; IAeadBlockCipher aeadBlockCipher = null; if (parts.Length > 2) { if (streamCipher != null) { throw new ArgumentException("Paddings not used for stream ciphers"); } string paddingName = parts[2]; CipherPadding cipherPadding; if (paddingName == "") { cipherPadding = CipherPadding.RAW; } else if (paddingName == "X9.23PADDING") { cipherPadding = CipherPadding.X923PADDING; } else { try { cipherPadding = (CipherPadding)Enums.GetEnumValue(typeof(CipherPadding), paddingName); } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } switch (cipherPadding) { case CipherPadding.NOPADDING: padded = false; break; case CipherPadding.RAW: break; case CipherPadding.ISO10126PADDING: case CipherPadding.ISO10126D2PADDING: case CipherPadding.ISO10126_2PADDING: padding = new ISO10126d2Padding(); break; case CipherPadding.ISO7816_4PADDING: case CipherPadding.ISO9797_1PADDING: padding = new ISO7816d4Padding(); break; case CipherPadding.ISO9796_1: case CipherPadding.ISO9796_1PADDING: asymBlockCipher = new ISO9796d1Encoding(asymBlockCipher); break; case CipherPadding.OAEP: case CipherPadding.OAEPPADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher); break; case CipherPadding.OAEPWITHMD5ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new MD5Digest()); break; case CipherPadding.OAEPWITHSHA1ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_1ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha1Digest()); break; case CipherPadding.OAEPWITHSHA224ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_224ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha224Digest()); break; case CipherPadding.OAEPWITHSHA256ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_256ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha256Digest()); break; case CipherPadding.OAEPWITHSHA384ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_384ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha384Digest()); break; case CipherPadding.OAEPWITHSHA512ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_512ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha512Digest()); break; case CipherPadding.PKCS1: case CipherPadding.PKCS1PADDING: asymBlockCipher = new Pkcs1Encoding(asymBlockCipher); break; case CipherPadding.PKCS5: case CipherPadding.PKCS5PADDING: case CipherPadding.PKCS7: case CipherPadding.PKCS7PADDING: padding = new Pkcs7Padding(); break; case CipherPadding.TBCPADDING: padding = new TbcPadding(); break; case CipherPadding.WITHCTS: cts = true; break; case CipherPadding.X923PADDING: padding = new X923Padding(); break; case CipherPadding.ZEROBYTEPADDING: padding = new ZeroBytePadding(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } string mode = ""; if (parts.Length > 1) { mode = parts[1]; int di = GetDigitIndex(mode); string modeName = di >= 0 ? mode.Substring(0, di) : mode; try { CipherMode cipherMode = modeName == "" ? CipherMode.NONE : (CipherMode)Enums.GetEnumValue(typeof(CipherMode), modeName); switch (cipherMode) { case CipherMode.ECB: case CipherMode.NONE: break; case CipherMode.CBC: blockCipher = new CbcBlockCipher(blockCipher); break; case CipherMode.CCM: aeadBlockCipher = new CcmBlockCipher(blockCipher); break; case CipherMode.CFB: { int bits = (di < 0) ? 8 * blockCipher.GetBlockSize() : int.Parse(mode.Substring(di)); blockCipher = new CfbBlockCipher(blockCipher, bits); break; } case CipherMode.CTR: blockCipher = new SicBlockCipher(blockCipher); break; case CipherMode.CTS: cts = true; blockCipher = new CbcBlockCipher(blockCipher); break; case CipherMode.EAX: aeadBlockCipher = new EaxBlockCipher(blockCipher); break; case CipherMode.GCM: aeadBlockCipher = new GcmBlockCipher(blockCipher); break; case CipherMode.GOFB: blockCipher = new GOfbBlockCipher(blockCipher); break; case CipherMode.OCB: aeadBlockCipher = new OcbBlockCipher(blockCipher, CreateBlockCipher(cipherAlgorithm)); break; case CipherMode.OFB: { int bits = (di < 0) ? 8 * blockCipher.GetBlockSize() : int.Parse(mode.Substring(di)); blockCipher = new OfbBlockCipher(blockCipher, bits); break; } case CipherMode.OPENPGPCFB: blockCipher = new OpenPgpCfbBlockCipher(blockCipher); break; case CipherMode.SIC: if (blockCipher.GetBlockSize() < 16) { throw new ArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)"); } blockCipher = new SicBlockCipher(blockCipher); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } if (aeadBlockCipher != null) { if (cts) { throw new SecurityUtilityException("CTS mode not valid for AEAD ciphers."); } if (padded && parts.Length > 2 && parts[2] != "") { throw new SecurityUtilityException("Bad padding specified for AEAD cipher."); } return(new BufferedAeadBlockCipher(aeadBlockCipher)); } if (blockCipher != null) { if (cts) { return(new CtsBlockCipher(blockCipher)); } if (padding != null) { return(new PaddedBufferedBlockCipher(blockCipher, padding)); } if (!padded || blockCipher.IsPartialBlockOkay) { return(new BufferedBlockCipher(blockCipher)); } return(new PaddedBufferedBlockCipher(blockCipher)); } if (asymBlockCipher != null) { return(new BufferedAsymmetricBlockCipher(asymBlockCipher)); } throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); }
/// <summary> /// Build the engine /// </summary> /// <param name="algorithm">SymmetricBlockAlgorithm enum, algorithm name</param> /// <returns>IBlockCipher with the algorithm Engine</returns> internal IBlockCipher getCipherEngine(SymmetricBlockAlgorithm algorithm) { IBlockCipher engine = null; switch (algorithm) { case SymmetricBlockAlgorithm.AES: engine = new AesEngine(); break; case SymmetricBlockAlgorithm.BLOWFISH: engine = new BlowfishEngine(); break; case SymmetricBlockAlgorithm.CAMELLIA: engine = new CamelliaEngine(); break; case SymmetricBlockAlgorithm.CAST5: engine = new Cast5Engine(); break; case SymmetricBlockAlgorithm.CAST6: engine = new Cast6Engine(); break; case SymmetricBlockAlgorithm.DES: engine = new DesEngine(); break; case SymmetricBlockAlgorithm.TRIPLEDES: engine = new DesEdeEngine(); break; case SymmetricBlockAlgorithm.DSTU7624_128: engine = new Dstu7624Engine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.DSTU7624_128, this.error)); break; case SymmetricBlockAlgorithm.DSTU7624_256: engine = new Dstu7624Engine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.DSTU7624_256, this.error)); break; case SymmetricBlockAlgorithm.DSTU7624_512: engine = new Dstu7624Engine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.DSTU7624_512, this.error)); break; case SymmetricBlockAlgorithm.GOST28147: engine = new Gost28147Engine(); break; case SymmetricBlockAlgorithm.NOEKEON: engine = new NoekeonEngine(); break; case SymmetricBlockAlgorithm.RC2: engine = new RC2Engine(); break; case SymmetricBlockAlgorithm.RC532: engine = new RC532Engine(); break; case SymmetricBlockAlgorithm.RC564: engine = new RC564Engine(); break; case SymmetricBlockAlgorithm.RC6: engine = new RC6Engine(); break; case SymmetricBlockAlgorithm.RIJNDAEL_128: engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_128, this.error)); break; case SymmetricBlockAlgorithm.RIJNDAEL_160: engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_160, this.error)); break; case SymmetricBlockAlgorithm.RIJNDAEL_192: engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_192, this.error)); break; case SymmetricBlockAlgorithm.RIJNDAEL_224: engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_224, this.error)); break; case SymmetricBlockAlgorithm.RIJNDAEL_256: engine = new RijndaelEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.RIJNDAEL_256, this.error)); break; case SymmetricBlockAlgorithm.SEED: engine = new SeedEngine(); break; case SymmetricBlockAlgorithm.SERPENT: engine = new SerpentEngine(); break; case SymmetricBlockAlgorithm.SKIPJACK: engine = new SkipjackEngine(); break; case SymmetricBlockAlgorithm.SM4: engine = new SM4Engine(); break; case SymmetricBlockAlgorithm.TEA: engine = new TeaEngine(); break; case SymmetricBlockAlgorithm.THREEFISH_256: engine = new ThreefishEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.THREEFISH_256, this.error)); break; case SymmetricBlockAlgorithm.THREEFISH_512: engine = new ThreefishEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.THREEFISH_512, this.error)); break; case SymmetricBlockAlgorithm.THREEFISH_1024: engine = new ThreefishEngine(SymmetricBlockAlgorithmUtils.getBlockSize(SymmetricBlockAlgorithm.THREEFISH_1024, this.error)); break; case SymmetricBlockAlgorithm.TWOFISH: engine = new TwofishEngine(); break; case SymmetricBlockAlgorithm.XTEA: engine = new XteaEngine(); break; default: this.error.setError("SB020", "Cipher " + algorithm + " not recognised."); break; } return(engine); }
public static IBufferedCipher GetCipher( string algorithm) { if (algorithm == null) throw new ArgumentNullException("algorithm"); algorithm = Platform.ToUpperInvariant(algorithm); { string aliased = (string) algorithms[algorithm]; if (aliased != null) algorithm = aliased; } IBasicAgreement iesAgreement = null; if (algorithm == "IES") { iesAgreement = new DHBasicAgreement(); } else if (algorithm == "ECIES") { iesAgreement = new ECDHBasicAgreement(); } if (iesAgreement != null) { return new BufferedIesCipher( new IesEngine( iesAgreement, new Kdf2BytesGenerator( new Sha1Digest()), new HMac( new Sha1Digest()))); } if (algorithm.StartsWith("PBE")) { if (algorithm.EndsWith("-CBC")) { if (algorithm == "PBEWITHSHA1ANDDES-CBC") { return new PaddedBufferedBlockCipher( new CbcBlockCipher(new DesEngine())); } else if (algorithm == "PBEWITHSHA1ANDRC2-CBC") { return new PaddedBufferedBlockCipher( new CbcBlockCipher(new RC2Engine())); } else if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND2-KEYTRIPLEDES-CBC", "PBEWITHSHAAND3-KEYTRIPLEDES-CBC")) { return new PaddedBufferedBlockCipher( new CbcBlockCipher(new DesEdeEngine())); } else if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND128BITRC2-CBC", "PBEWITHSHAAND40BITRC2-CBC")) { return new PaddedBufferedBlockCipher( new CbcBlockCipher(new RC2Engine())); } } else if (algorithm.EndsWith("-BC") || algorithm.EndsWith("-OPENSSL")) { if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND128BITAES-CBC-BC", "PBEWITHSHAAND192BITAES-CBC-BC", "PBEWITHSHAAND256BITAES-CBC-BC", "PBEWITHSHA256AND128BITAES-CBC-BC", "PBEWITHSHA256AND192BITAES-CBC-BC", "PBEWITHSHA256AND256BITAES-CBC-BC", "PBEWITHMD5AND128BITAES-CBC-OPENSSL", "PBEWITHMD5AND192BITAES-CBC-OPENSSL", "PBEWITHMD5AND256BITAES-CBC-OPENSSL")) { return new PaddedBufferedBlockCipher( new CbcBlockCipher(new AesFastEngine())); } } } string[] parts = algorithm.Split('/'); IBlockCipher blockCipher = null; IAsymmetricBlockCipher asymBlockCipher = null; IStreamCipher streamCipher = null; string algorithmName = parts[0]; { string aliased = (string)algorithms[algorithmName]; if (aliased != null) algorithmName = aliased; } CipherAlgorithm cipherAlgorithm; try { cipherAlgorithm = (CipherAlgorithm)Enums.GetEnumValue(typeof(CipherAlgorithm), algorithmName); } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } switch (cipherAlgorithm) { case CipherAlgorithm.AES: blockCipher = new AesFastEngine(); break; case CipherAlgorithm.ARC4: streamCipher = new RC4Engine(); break; case CipherAlgorithm.BLOWFISH: blockCipher = new BlowfishEngine(); break; case CipherAlgorithm.CAMELLIA: blockCipher = new CamelliaEngine(); break; case CipherAlgorithm.CAST5: blockCipher = new Cast5Engine(); break; case CipherAlgorithm.CAST6: blockCipher = new Cast6Engine(); break; case CipherAlgorithm.DES: blockCipher = new DesEngine(); break; case CipherAlgorithm.DESEDE: blockCipher = new DesEdeEngine(); break; case CipherAlgorithm.ELGAMAL: asymBlockCipher = new ElGamalEngine(); break; case CipherAlgorithm.GOST28147: blockCipher = new Gost28147Engine(); break; case CipherAlgorithm.HC128: streamCipher = new HC128Engine(); break; case CipherAlgorithm.HC256: streamCipher = new HC256Engine(); break; case CipherAlgorithm.IDEA: blockCipher = new IdeaEngine(); break; case CipherAlgorithm.NOEKEON: blockCipher = new NoekeonEngine(); break; case CipherAlgorithm.PBEWITHSHAAND128BITRC4: case CipherAlgorithm.PBEWITHSHAAND40BITRC4: streamCipher = new RC4Engine(); break; case CipherAlgorithm.RC2: blockCipher = new RC2Engine(); break; case CipherAlgorithm.RC5: blockCipher = new RC532Engine(); break; case CipherAlgorithm.RC5_64: blockCipher = new RC564Engine(); break; case CipherAlgorithm.RC6: blockCipher = new RC6Engine(); break; case CipherAlgorithm.RIJNDAEL: blockCipher = new RijndaelEngine(); break; case CipherAlgorithm.RSA: asymBlockCipher = new RsaBlindedEngine(); break; case CipherAlgorithm.SALSA20: streamCipher = new Salsa20Engine(); break; case CipherAlgorithm.SEED: blockCipher = new SeedEngine(); break; case CipherAlgorithm.SERPENT: blockCipher = new SerpentEngine(); break; case CipherAlgorithm.SKIPJACK: blockCipher = new SkipjackEngine(); break; case CipherAlgorithm.TEA: blockCipher = new TeaEngine(); break; case CipherAlgorithm.TWOFISH: blockCipher = new TwofishEngine(); break; case CipherAlgorithm.VMPC: streamCipher = new VmpcEngine(); break; case CipherAlgorithm.VMPC_KSA3: streamCipher = new VmpcKsa3Engine(); break; case CipherAlgorithm.XTEA: blockCipher = new XteaEngine(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } if (streamCipher != null) { if (parts.Length > 1) throw new ArgumentException("Modes and paddings not used for stream ciphers"); return new BufferedStreamCipher(streamCipher); } bool cts = false; bool padded = true; IBlockCipherPadding padding = null; IAeadBlockCipher aeadBlockCipher = null; if (parts.Length > 2) { if (streamCipher != null) throw new ArgumentException("Paddings not used for stream ciphers"); string paddingName = parts[2]; CipherPadding cipherPadding; if (paddingName == "") { cipherPadding = CipherPadding.RAW; } else if (paddingName == "X9.23PADDING") { cipherPadding = CipherPadding.X923PADDING; } else { try { cipherPadding = (CipherPadding)Enums.GetEnumValue(typeof(CipherPadding), paddingName); } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } switch (cipherPadding) { case CipherPadding.NOPADDING: padded = false; break; case CipherPadding.RAW: break; case CipherPadding.ISO10126PADDING: case CipherPadding.ISO10126D2PADDING: case CipherPadding.ISO10126_2PADDING: padding = new ISO10126d2Padding(); break; case CipherPadding.ISO7816_4PADDING: case CipherPadding.ISO9797_1PADDING: padding = new ISO7816d4Padding(); break; case CipherPadding.ISO9796_1: case CipherPadding.ISO9796_1PADDING: asymBlockCipher = new ISO9796d1Encoding(asymBlockCipher); break; case CipherPadding.OAEP: case CipherPadding.OAEPPADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher); break; case CipherPadding.OAEPWITHMD5ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new MD5Digest()); break; case CipherPadding.OAEPWITHSHA1ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_1ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha1Digest()); break; case CipherPadding.OAEPWITHSHA224ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_224ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha224Digest()); break; case CipherPadding.OAEPWITHSHA256ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_256ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha256Digest()); break; case CipherPadding.OAEPWITHSHA384ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_384ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha384Digest()); break; case CipherPadding.OAEPWITHSHA512ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_512ANDMGF1PADDING: asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha512Digest()); break; case CipherPadding.PKCS1: case CipherPadding.PKCS1PADDING: asymBlockCipher = new Pkcs1Encoding(asymBlockCipher); break; case CipherPadding.PKCS5: case CipherPadding.PKCS5PADDING: case CipherPadding.PKCS7: case CipherPadding.PKCS7PADDING: padding = new Pkcs7Padding(); break; case CipherPadding.TBCPADDING: padding = new TbcPadding(); break; case CipherPadding.WITHCTS: cts = true; break; case CipherPadding.X923PADDING: padding = new X923Padding(); break; case CipherPadding.ZEROBYTEPADDING: padding = new ZeroBytePadding(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } string mode = ""; if (parts.Length > 1) { mode = parts[1]; int di = GetDigitIndex(mode); string modeName = di >= 0 ? mode.Substring(0, di) : mode; try { CipherMode cipherMode = modeName == "" ? CipherMode.NONE : (CipherMode)Enums.GetEnumValue(typeof(CipherMode), modeName); switch (cipherMode) { case CipherMode.ECB: case CipherMode.NONE: break; case CipherMode.CBC: blockCipher = new CbcBlockCipher(blockCipher); break; case CipherMode.CFB: { int bits = (di < 0) ? 8 * blockCipher.GetBlockSize() : int.Parse(mode.Substring(di)); blockCipher = new CfbBlockCipher(blockCipher, bits); break; } case CipherMode.CTR: blockCipher = new SicBlockCipher(blockCipher); break; case CipherMode.CTS: cts = true; blockCipher = new CbcBlockCipher(blockCipher); break; case CipherMode.EAX: aeadBlockCipher = new EaxBlockCipher(blockCipher); break; case CipherMode.GCM: aeadBlockCipher = new GcmBlockCipher(blockCipher); break; case CipherMode.GOFB: blockCipher = new GOfbBlockCipher(blockCipher); break; case CipherMode.OCB: aeadBlockCipher = new OcbBlockCipher(blockCipher, CreateBlockCipher(cipherAlgorithm)); break; case CipherMode.OFB: { int bits = (di < 0) ? 8 * blockCipher.GetBlockSize() : int.Parse(mode.Substring(di)); blockCipher = new OfbBlockCipher(blockCipher, bits); break; } case CipherMode.OPENPGPCFB: blockCipher = new OpenPgpCfbBlockCipher(blockCipher); break; case CipherMode.SIC: if (blockCipher.GetBlockSize() < 16) { throw new ArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)"); } blockCipher = new SicBlockCipher(blockCipher); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } if (aeadBlockCipher != null) { if (cts) throw new SecurityUtilityException("CTS mode not valid for AEAD ciphers."); if (padded && parts.Length > 2 && parts[2] != "") throw new SecurityUtilityException("Bad padding specified for AEAD cipher."); return new BufferedAeadBlockCipher(aeadBlockCipher); } if (blockCipher != null) { if (cts) { return new CtsBlockCipher(blockCipher); } if (padding != null) { return new PaddedBufferedBlockCipher(blockCipher, padding); } if (!padded || blockCipher.IsPartialBlockOkay) { return new BufferedBlockCipher(blockCipher); } return new PaddedBufferedBlockCipher(blockCipher); } if (asymBlockCipher != null) { return new BufferedAsymmetricBlockCipher(asymBlockCipher); } throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); }
public static IBufferedCipher GetCipher(string algorithm) { //IL_0008: Unknown result type (might be due to invalid IL or missing references) //IL_0469: Unknown result type (might be due to invalid IL or missing references) //IL_0495: Unknown result type (might be due to invalid IL or missing references) //IL_07f1: Unknown result type (might be due to invalid IL or missing references) if (algorithm == null) { throw new ArgumentNullException("algorithm"); } algorithm = Platform.ToUpperInvariant(algorithm); string text = (string)algorithms.get_Item((object)algorithm); if (text != null) { algorithm = text; } IBasicAgreement basicAgreement = null; if (algorithm == "IES") { basicAgreement = new DHBasicAgreement(); } else if (algorithm == "ECIES") { basicAgreement = new ECDHBasicAgreement(); } if (basicAgreement != null) { return(new BufferedIesCipher(new IesEngine(basicAgreement, new Kdf2BytesGenerator(new Sha1Digest()), new HMac(new Sha1Digest())))); } if (Platform.StartsWith(algorithm, "PBE")) { if (Platform.EndsWith(algorithm, "-CBC")) { if (algorithm == "PBEWITHSHA1ANDDES-CBC") { return(new PaddedBufferedBlockCipher(new CbcBlockCipher(new DesEngine()))); } if (algorithm == "PBEWITHSHA1ANDRC2-CBC") { return(new PaddedBufferedBlockCipher(new CbcBlockCipher(new RC2Engine()))); } if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND2-KEYTRIPLEDES-CBC", "PBEWITHSHAAND3-KEYTRIPLEDES-CBC")) { return(new PaddedBufferedBlockCipher(new CbcBlockCipher(new DesEdeEngine()))); } if (Strings.IsOneOf(algorithm, "PBEWITHSHAAND128BITRC2-CBC", "PBEWITHSHAAND40BITRC2-CBC")) { return(new PaddedBufferedBlockCipher(new CbcBlockCipher(new RC2Engine()))); } } else if ((Platform.EndsWith(algorithm, "-BC") || Platform.EndsWith(algorithm, "-OPENSSL")) && Strings.IsOneOf(algorithm, "PBEWITHSHAAND128BITAES-CBC-BC", "PBEWITHSHAAND192BITAES-CBC-BC", "PBEWITHSHAAND256BITAES-CBC-BC", "PBEWITHSHA256AND128BITAES-CBC-BC", "PBEWITHSHA256AND192BITAES-CBC-BC", "PBEWITHSHA256AND256BITAES-CBC-BC", "PBEWITHMD5AND128BITAES-CBC-OPENSSL", "PBEWITHMD5AND192BITAES-CBC-OPENSSL", "PBEWITHMD5AND256BITAES-CBC-OPENSSL")) { return(new PaddedBufferedBlockCipher(new CbcBlockCipher(new AesFastEngine()))); } } string[] array = algorithm.Split(new char[1] { '/' }); IBlockCipher blockCipher = null; IAsymmetricBlockCipher asymmetricBlockCipher = null; IStreamCipher streamCipher = null; string text2 = array[0]; string text3 = (string)algorithms.get_Item((object)text2); if (text3 != null) { text2 = text3; } CipherAlgorithm cipherAlgorithm; try { cipherAlgorithm = (CipherAlgorithm)Enums.GetEnumValue(typeof(CipherAlgorithm), text2); } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } switch (cipherAlgorithm) { case CipherAlgorithm.AES: blockCipher = new AesFastEngine(); break; case CipherAlgorithm.ARC4: streamCipher = new RC4Engine(); break; case CipherAlgorithm.BLOWFISH: blockCipher = new BlowfishEngine(); break; case CipherAlgorithm.CAMELLIA: blockCipher = new CamelliaEngine(); break; case CipherAlgorithm.CAST5: blockCipher = new Cast5Engine(); break; case CipherAlgorithm.CAST6: blockCipher = new Cast6Engine(); break; case CipherAlgorithm.DES: blockCipher = new DesEngine(); break; case CipherAlgorithm.DESEDE: blockCipher = new DesEdeEngine(); break; case CipherAlgorithm.ELGAMAL: asymmetricBlockCipher = new ElGamalEngine(); break; case CipherAlgorithm.GOST28147: blockCipher = new Gost28147Engine(); break; case CipherAlgorithm.HC128: streamCipher = new HC128Engine(); break; case CipherAlgorithm.HC256: streamCipher = new HC256Engine(); break; case CipherAlgorithm.IDEA: blockCipher = new IdeaEngine(); break; case CipherAlgorithm.NOEKEON: blockCipher = new NoekeonEngine(); break; case CipherAlgorithm.PBEWITHSHAAND128BITRC4: case CipherAlgorithm.PBEWITHSHAAND40BITRC4: streamCipher = new RC4Engine(); break; case CipherAlgorithm.RC2: blockCipher = new RC2Engine(); break; case CipherAlgorithm.RC5: blockCipher = new RC532Engine(); break; case CipherAlgorithm.RC5_64: blockCipher = new RC564Engine(); break; case CipherAlgorithm.RC6: blockCipher = new RC6Engine(); break; case CipherAlgorithm.RIJNDAEL: blockCipher = new RijndaelEngine(); break; case CipherAlgorithm.RSA: asymmetricBlockCipher = new RsaBlindedEngine(); break; case CipherAlgorithm.SALSA20: streamCipher = new Salsa20Engine(); break; case CipherAlgorithm.SEED: blockCipher = new SeedEngine(); break; case CipherAlgorithm.SERPENT: blockCipher = new SerpentEngine(); break; case CipherAlgorithm.SKIPJACK: blockCipher = new SkipjackEngine(); break; case CipherAlgorithm.TEA: blockCipher = new TeaEngine(); break; case CipherAlgorithm.THREEFISH_256: blockCipher = new ThreefishEngine(256); break; case CipherAlgorithm.THREEFISH_512: blockCipher = new ThreefishEngine(512); break; case CipherAlgorithm.THREEFISH_1024: blockCipher = new ThreefishEngine(1024); break; case CipherAlgorithm.TNEPRES: blockCipher = new TnepresEngine(); break; case CipherAlgorithm.TWOFISH: blockCipher = new TwofishEngine(); break; case CipherAlgorithm.VMPC: streamCipher = new VmpcEngine(); break; case CipherAlgorithm.VMPC_KSA3: streamCipher = new VmpcKsa3Engine(); break; case CipherAlgorithm.XTEA: blockCipher = new XteaEngine(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } if (streamCipher != null) { if (array.Length > 1) { throw new ArgumentException("Modes and paddings not used for stream ciphers"); } return(new BufferedStreamCipher(streamCipher)); } bool flag = false; bool flag2 = true; IBlockCipherPadding blockCipherPadding = null; IAeadBlockCipher aeadBlockCipher = null; if (array.Length > 2) { if (streamCipher != null) { throw new ArgumentException("Paddings not used for stream ciphers"); } string text4 = array[2]; CipherPadding cipherPadding; if (text4 == "") { cipherPadding = CipherPadding.RAW; } else if (text4 == "X9.23PADDING") { cipherPadding = CipherPadding.X923PADDING; } else { try { cipherPadding = (CipherPadding)Enums.GetEnumValue(typeof(CipherPadding), text4); } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } switch (cipherPadding) { case CipherPadding.NOPADDING: flag2 = false; break; case CipherPadding.ISO10126PADDING: case CipherPadding.ISO10126D2PADDING: case CipherPadding.ISO10126_2PADDING: blockCipherPadding = new ISO10126d2Padding(); break; case CipherPadding.ISO7816_4PADDING: case CipherPadding.ISO9797_1PADDING: blockCipherPadding = new ISO7816d4Padding(); break; case CipherPadding.ISO9796_1: case CipherPadding.ISO9796_1PADDING: asymmetricBlockCipher = new ISO9796d1Encoding(asymmetricBlockCipher); break; case CipherPadding.OAEP: case CipherPadding.OAEPPADDING: asymmetricBlockCipher = new OaepEncoding(asymmetricBlockCipher); break; case CipherPadding.OAEPWITHMD5ANDMGF1PADDING: asymmetricBlockCipher = new OaepEncoding(asymmetricBlockCipher, new MD5Digest()); break; case CipherPadding.OAEPWITHSHA1ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_1ANDMGF1PADDING: asymmetricBlockCipher = new OaepEncoding(asymmetricBlockCipher, new Sha1Digest()); break; case CipherPadding.OAEPWITHSHA224ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_224ANDMGF1PADDING: asymmetricBlockCipher = new OaepEncoding(asymmetricBlockCipher, new Sha224Digest()); break; case CipherPadding.OAEPWITHSHA256ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_256ANDMGF1PADDING: asymmetricBlockCipher = new OaepEncoding(asymmetricBlockCipher, new Sha256Digest()); break; case CipherPadding.OAEPWITHSHA384ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_384ANDMGF1PADDING: asymmetricBlockCipher = new OaepEncoding(asymmetricBlockCipher, new Sha384Digest()); break; case CipherPadding.OAEPWITHSHA512ANDMGF1PADDING: case CipherPadding.OAEPWITHSHA_512ANDMGF1PADDING: asymmetricBlockCipher = new OaepEncoding(asymmetricBlockCipher, new Sha512Digest()); break; case CipherPadding.PKCS1: case CipherPadding.PKCS1PADDING: asymmetricBlockCipher = new Pkcs1Encoding(asymmetricBlockCipher); break; case CipherPadding.PKCS5: case CipherPadding.PKCS5PADDING: case CipherPadding.PKCS7: case CipherPadding.PKCS7PADDING: blockCipherPadding = new Pkcs7Padding(); break; case CipherPadding.TBCPADDING: blockCipherPadding = new TbcPadding(); break; case CipherPadding.WITHCTS: flag = true; break; case CipherPadding.X923PADDING: blockCipherPadding = new X923Padding(); break; case CipherPadding.ZEROBYTEPADDING: blockCipherPadding = new ZeroBytePadding(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); case CipherPadding.RAW: break; } } string text5 = ""; if (array.Length > 1) { text5 = array[1]; int digitIndex = GetDigitIndex(text5); string text6 = ((digitIndex >= 0) ? text5.Substring(0, digitIndex) : text5); try { switch ((text6 == "") ? CipherMode.NONE : ((CipherMode)Enums.GetEnumValue(typeof(CipherMode), text6))) { case CipherMode.CBC: blockCipher = new CbcBlockCipher(blockCipher); break; case CipherMode.CCM: aeadBlockCipher = new CcmBlockCipher(blockCipher); break; case CipherMode.CFB: { int bitBlockSize = ((digitIndex < 0) ? (8 * blockCipher.GetBlockSize()) : int.Parse(text5.Substring(digitIndex))); blockCipher = new CfbBlockCipher(blockCipher, bitBlockSize); break; } case CipherMode.CTR: blockCipher = new SicBlockCipher(blockCipher); break; case CipherMode.CTS: flag = true; blockCipher = new CbcBlockCipher(blockCipher); break; case CipherMode.EAX: aeadBlockCipher = new EaxBlockCipher(blockCipher); break; case CipherMode.GCM: aeadBlockCipher = new GcmBlockCipher(blockCipher); break; case CipherMode.GOFB: blockCipher = new GOfbBlockCipher(blockCipher); break; case CipherMode.OCB: aeadBlockCipher = new OcbBlockCipher(blockCipher, CreateBlockCipher(cipherAlgorithm)); break; case CipherMode.OFB: { int blockSize = ((digitIndex < 0) ? (8 * blockCipher.GetBlockSize()) : int.Parse(text5.Substring(digitIndex))); blockCipher = new OfbBlockCipher(blockCipher, blockSize); break; } case CipherMode.OPENPGPCFB: blockCipher = new OpenPgpCfbBlockCipher(blockCipher); break; case CipherMode.SIC: if (blockCipher.GetBlockSize() < 16) { throw new ArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)"); } blockCipher = new SicBlockCipher(blockCipher); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); case CipherMode.ECB: case CipherMode.NONE: break; } } catch (ArgumentException) { throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } if (aeadBlockCipher != null) { if (flag) { throw new SecurityUtilityException("CTS mode not valid for AEAD ciphers."); } if (flag2 && array.Length > 2 && array[2] != "") { throw new SecurityUtilityException("Bad padding specified for AEAD cipher."); } return(new BufferedAeadBlockCipher(aeadBlockCipher)); } if (blockCipher != null) { if (flag) { return(new CtsBlockCipher(blockCipher)); } if (blockCipherPadding != null) { return(new PaddedBufferedBlockCipher(blockCipher, blockCipherPadding)); } if (!flag2 || blockCipher.IsPartialBlockOkay) { return(new BufferedBlockCipher(blockCipher)); } return(new PaddedBufferedBlockCipher(blockCipher)); } if (asymmetricBlockCipher != null) { return(new BufferedAsymmetricBlockCipher(asymmetricBlockCipher)); } throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); }
public static IBufferedCipher GetCipher( string algorithm) { if (algorithm == null) { throw new ArgumentNullException("algorithm"); } algorithm = algorithm.ToUpper(CultureInfo.InvariantCulture); string aliased = (string)algorithms[algorithm]; if (aliased != null) { algorithm = aliased; } IBasicAgreement iesAgreement = null; if (algorithm == "IES") { iesAgreement = new DHBasicAgreement(); } else if (algorithm == "ECIES") { iesAgreement = new ECDHBasicAgreement(); } if (iesAgreement != null) { return(new BufferedIesCipher( new IesEngine( iesAgreement, new Kdf2BytesGenerator( new Sha1Digest()), new HMac( new Sha1Digest())))); } if (algorithm.StartsWith("PBE")) { switch (algorithm) { case "PBEWITHSHAAND2-KEYTRIPLEDES-CBC": case "PBEWITHSHAAND3-KEYTRIPLEDES-CBC": return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new DesEdeEngine()))); case "PBEWITHSHAAND128BITRC2-CBC": case "PBEWITHSHAAND40BITRC2-CBC": return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new RC2Engine()))); case "PBEWITHSHAAND128BITAES-CBC-BC": case "PBEWITHSHAAND192BITAES-CBC-BC": case "PBEWITHSHAAND256BITAES-CBC-BC": case "PBEWITHSHA256AND128BITAES-CBC-BC": case "PBEWITHSHA256AND192BITAES-CBC-BC": case "PBEWITHSHA256AND256BITAES-CBC-BC": case "PBEWITHMD5AND128BITAES-CBC-OPENSSL": case "PBEWITHMD5AND192BITAES-CBC-OPENSSL": case "PBEWITHMD5AND256BITAES-CBC-OPENSSL": return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new AesFastEngine()))); case "PBEWITHSHA1ANDDES-CBC": return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new DesEngine()))); case "PBEWITHSHA1ANDRC2-CBC": return(new PaddedBufferedBlockCipher( new CbcBlockCipher(new RC2Engine()))); } } string[] parts = algorithm.Split('/'); IBlockCipher blockCipher = null; IAsymmetricBlockCipher asymBlockCipher = null; IStreamCipher streamCipher = null; switch (parts[0]) { case "AES": blockCipher = new AesFastEngine(); break; case "ARC4": streamCipher = new RC4Engine(); break; case "BLOWFISH": blockCipher = new BlowfishEngine(); break; case "CAMELLIA": blockCipher = new CamelliaEngine(); break; case "CAST5": blockCipher = new Cast5Engine(); break; case "CAST6": blockCipher = new Cast6Engine(); break; case "DES": blockCipher = new DesEngine(); break; case "DESEDE": blockCipher = new DesEdeEngine(); break; case "ELGAMAL": asymBlockCipher = new ElGamalEngine(); break; case "GOST28147": blockCipher = new Gost28147Engine(); break; case "HC128": streamCipher = new HC128Engine(); break; case "HC256": streamCipher = new HC256Engine(); break; #if INCLUDE_IDEA case "IDEA": blockCipher = new IdeaEngine(); break; #endif case "NOEKEON": blockCipher = new NoekeonEngine(); break; case "PBEWITHSHAAND128BITRC4": case "PBEWITHSHAAND40BITRC4": streamCipher = new RC4Engine(); break; case "RC2": blockCipher = new RC2Engine(); break; case "RC5": blockCipher = new RC532Engine(); break; case "RC5-64": blockCipher = new RC564Engine(); break; case "RC6": blockCipher = new RC6Engine(); break; case "RIJNDAEL": blockCipher = new RijndaelEngine(); break; case "RSA": asymBlockCipher = new RsaBlindedEngine(); break; case "SALSA20": streamCipher = new Salsa20Engine(); break; case "SEED": blockCipher = new SeedEngine(); break; case "SERPENT": blockCipher = new SerpentEngine(); break; case "SKIPJACK": blockCipher = new SkipjackEngine(); break; case "TEA": blockCipher = new TeaEngine(); break; case "TWOFISH": blockCipher = new TwofishEngine(); break; case "VMPC": streamCipher = new VmpcEngine(); break; case "VMPC-KSA3": streamCipher = new VmpcKsa3Engine(); break; case "XTEA": blockCipher = new XteaEngine(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } if (streamCipher != null) { if (parts.Length > 1) { throw new ArgumentException("Modes and paddings not used for stream ciphers"); } return(new BufferedStreamCipher(streamCipher)); } bool cts = false; bool padded = true; IBlockCipherPadding padding = null; IAeadBlockCipher aeadBlockCipher = null; if (parts.Length > 2) { if (streamCipher != null) { throw new ArgumentException("Paddings not used for stream ciphers"); } switch (parts[2]) { case "NOPADDING": padded = false; break; case "": case "RAW": break; case "ISO10126PADDING": case "ISO10126D2PADDING": case "ISO10126-2PADDING": padding = new ISO10126d2Padding(); break; case "ISO7816-4PADDING": case "ISO9797-1PADDING": padding = new ISO7816d4Padding(); break; case "ISO9796-1": case "ISO9796-1PADDING": asymBlockCipher = new ISO9796d1Encoding(asymBlockCipher); break; case "OAEP": case "OAEPPADDING": asymBlockCipher = new OaepEncoding(asymBlockCipher); break; case "OAEPWITHMD5ANDMGF1PADDING": asymBlockCipher = new OaepEncoding(asymBlockCipher, new MD5Digest()); break; case "OAEPWITHSHA1ANDMGF1PADDING": case "OAEPWITHSHA-1ANDMGF1PADDING": asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha1Digest()); break; case "OAEPWITHSHA224ANDMGF1PADDING": case "OAEPWITHSHA-224ANDMGF1PADDING": asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha224Digest()); break; case "OAEPWITHSHA256ANDMGF1PADDING": case "OAEPWITHSHA-256ANDMGF1PADDING": asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha256Digest()); break; case "OAEPWITHSHA384ANDMGF1PADDING": case "OAEPWITHSHA-384ANDMGF1PADDING": asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha384Digest()); break; case "OAEPWITHSHA512ANDMGF1PADDING": case "OAEPWITHSHA-512ANDMGF1PADDING": asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha512Digest()); break; case "PKCS1": case "PKCS1PADDING": asymBlockCipher = new Pkcs1Encoding(asymBlockCipher); break; case "PKCS5": case "PKCS5PADDING": case "PKCS7": case "PKCS7PADDING": // NB: Padding defaults to Pkcs7Padding already break; case "TBCPADDING": padding = new TbcPadding(); break; case "WITHCTS": cts = true; break; case "X9.23PADDING": case "X923PADDING": padding = new X923Padding(); break; case "ZEROBYTEPADDING": padding = new ZeroBytePadding(); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } string mode = ""; if (parts.Length > 1) { mode = parts[1]; int di = GetDigitIndex(mode); string modeName = di >= 0 ? mode.Substring(0, di) : mode; switch (modeName) { case "": case "ECB": case "NONE": break; case "CBC": blockCipher = new CbcBlockCipher(blockCipher); break; case "CCM": aeadBlockCipher = new CcmBlockCipher(blockCipher); break; case "CFB": { int bits = (di < 0) ? 8 * blockCipher.GetBlockSize() : int.Parse(mode.Substring(di)); blockCipher = new CfbBlockCipher(blockCipher, bits); break; } case "CTR": blockCipher = new SicBlockCipher(blockCipher); break; case "CTS": cts = true; blockCipher = new CbcBlockCipher(blockCipher); break; case "EAX": aeadBlockCipher = new EaxBlockCipher(blockCipher); break; case "GCM": aeadBlockCipher = new GcmBlockCipher(blockCipher); break; case "GOFB": blockCipher = new GOfbBlockCipher(blockCipher); break; case "OFB": { int bits = (di < 0) ? 8 * blockCipher.GetBlockSize() : int.Parse(mode.Substring(di)); blockCipher = new OfbBlockCipher(blockCipher, bits); break; } case "OPENPGPCFB": blockCipher = new OpenPgpCfbBlockCipher(blockCipher); break; case "SIC": if (blockCipher.GetBlockSize() < 16) { throw new ArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)"); } blockCipher = new SicBlockCipher(blockCipher); break; default: throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); } } if (aeadBlockCipher != null) { if (cts) { throw new SecurityUtilityException("CTS mode not valid for AEAD ciphers."); } if (padded && parts.Length > 1 && parts[2] != "") { throw new SecurityUtilityException("Bad padding specified for AEAD cipher."); } return(new BufferedAeadBlockCipher(aeadBlockCipher)); } if (blockCipher != null) { if (cts) { return(new CtsBlockCipher(blockCipher)); } if (!padded || blockCipher.IsPartialBlockOkay) { return(new BufferedBlockCipher(blockCipher)); } if (padding != null) { return(new PaddedBufferedBlockCipher(blockCipher, padding)); } return(new PaddedBufferedBlockCipher(blockCipher)); } if (asymBlockCipher != null) { return(new BufferedAsymmetricBlockCipher(asymBlockCipher)); } throw new SecurityUtilityException("Cipher " + algorithm + " not recognised."); }
public static ArrayLease <byte> EncryptBytes(ArraySegment <byte> plaintext, ArraySegment <byte> key, out int count) { // Blowfish encrypts 8 bytes at a time int leftover = plaintext.Count & 7; count = (plaintext.Count + 7) & ~7; // branchless version of: n - (n % 8) + 8 // if there's leftover we'll need another extra 8 bytes to hold the input // note that this should not be part of the outputted array, // so store it in a new variable int capacity = count + ((leftover + 7) & ~7); Debug.Assert(leftover == 0 ^ capacity != plaintext.Count); var engine = new BlowfishEngine(); var keyParameter = new KeyParameter(key.Array, key.Offset, key.Count); engine.Init(forEncryption: true, parameters: keyParameter); var lease = ArrayPool <byte> .Shared.Lease(capacity); try { int i = plaintext.Offset; int j = 0; byte[] input = plaintext.Array; byte[] output = lease.Array; // Process each block of bytes while (i + 7 < plaintext.Count) { engine.ProcessBlock(input, i, output, j); i += 8; j += 8; } Debug.Assert( i + leftover == plaintext.Count && leftover >= 0 && leftover < 8); if (leftover != 0) { // Handle the leftover input bytes Debug.Assert( count > plaintext.Count && (count % 8) == 0 && capacity == count + 8); // Copy over the remaining input data to the end of the output array int inputIndex = i, outputIndex = j + 8; while (inputIndex < plaintext.Count) { output[outputIndex++] = input[inputIndex++]; } // Since this is a rented array, clear any extraneous data at the end // Use a regular while loop, since it's less than 8 bytes Debug.Assert( outputIndex <= capacity && capacity - outputIndex < 8); while (outputIndex < capacity) { output[outputIndex++] = 0; } engine.ProcessBlock(output, j + 8, output, j); } } catch { lease.Dispose(); throw; } return(lease); }