private void ivParamTest(
int count,
IAeadBlockCipher eax,
byte[] k,
byte[] n)
{
byte[] p = Encoding.ASCII.GetBytes("hello world!!");
eax.Init(true, new ParametersWithIV(new KeyParameter(k), n));
byte[] enc = new byte[p.Length + 8];
int len = eax.ProcessBytes(p, 0, p.Length, enc, 0);
len += eax.DoFinal(enc, len);
eax.Init(false, new ParametersWithIV(new KeyParameter(k), n));
byte[] tmp = new byte[enc.Length];
len = eax.ProcessBytes(enc, 0, enc.Length, tmp, 0);
len += eax.DoFinal(tmp, len);
byte[] dec = new byte[len];
Array.Copy(tmp, 0, dec, 0, len);
if (!AreEqual(p, dec))
{
Fail("decrypted stream fails to match in test " + count);
}
}
/// <exception cref="IOException"></exception>
public /*virtual */ BufferSegment EncodePlaintext(long seqNo, byte type, byte[] plaintext, int offset, int len)
{
// nonce is passed to AeadParameters and used a lot of places
byte[] nonce = new byte[encryptImplicitNonce.Length + record_iv_length];
switch (nonceMode)
{
case NONCE_RFC5288:
Array.Copy(encryptImplicitNonce, 0, nonce, 0, encryptImplicitNonce.Length);
// RFC 5288/6655: The nonce_explicit MAY be the 64-bit sequence number.
TlsUtilities.WriteUint64(seqNo, nonce, encryptImplicitNonce.Length);
break;
case NONCE_DRAFT_CHACHA20_POLY1305:
TlsUtilities.WriteUint64(seqNo, nonce, nonce.Length - 8);
for (int i = 0; i < encryptImplicitNonce.Length; ++i)
{
nonce[i] ^= encryptImplicitNonce[i];
}
break;
default:
throw new TlsFatalAlert(AlertDescription.internal_error);
}
int plaintextOffset = offset;
int plaintextLength = len;
int ciphertextLength = encryptCipher.GetOutputSize(plaintextLength);
int outputLength = record_iv_length + ciphertextLength;
byte[] output = BufferPool.Get(outputLength, true);
if (record_iv_length != 0)
{
Array.Copy(nonce, nonce.Length - record_iv_length, output, 0, record_iv_length);
}
int outputPos = record_iv_length;
byte[] additionalData = GetAdditionalData(seqNo, type, plaintextLength);
AeadParameters parameters = new AeadParameters(null, 8 * macSize, nonce, additionalData);
try
{
encryptCipher.Init(true, parameters);
outputPos += encryptCipher.ProcessBytes(plaintext, plaintextOffset, plaintextLength, output, outputPos);
outputPos += encryptCipher.DoFinal(output, outputPos);
}
catch (Exception e)
{
throw new TlsFatalAlert(AlertDescription.internal_error, e);
}
if (outputPos != outputLength)
{
// NOTE: Existing AEAD cipher implementations all give exact output lengths
throw new TlsFatalAlert(AlertDescription.internal_error);
}
return(new BufferSegment(output, 0, outputLength));
}
public virtual byte[] EncodePlaintext(long seqNo, byte type, byte[] plaintext, int offset, int len)
{
byte[] array = new byte[encryptImplicitNonce.Length + nonce_explicit_length];
Array.Copy(encryptImplicitNonce, 0, array, 0, encryptImplicitNonce.Length);
TlsUtilities.WriteUint64(seqNo, array, encryptImplicitNonce.Length);
int outputSize = encryptCipher.GetOutputSize(len);
byte[] array2 = new byte[nonce_explicit_length + outputSize];
Array.Copy(array, encryptImplicitNonce.Length, array2, 0, nonce_explicit_length);
int num = nonce_explicit_length;
byte[] additionalData = GetAdditionalData(seqNo, type, len);
AeadParameters parameters = new AeadParameters(null, 8 * macSize, array, additionalData);
try
{
encryptCipher.Init(forEncryption: true, parameters);
num += encryptCipher.ProcessBytes(plaintext, offset, len, array2, num);
num += encryptCipher.DoFinal(array2, num);
}
catch (Exception alertCause)
{
throw new TlsFatalAlert(80, alertCause);
}
if (num != array2.Length)
{
throw new TlsFatalAlert(80);
}
return(array2);
}
private int UpdateCiphers(IAeadBlockCipher c1, IAeadBlockCipher c2, byte[] S, int i,
bool includeAAD, bool includePlaintext)
{
int inputLen = includePlaintext ? i : 0;
int outputLen = c2.GetOutputSize(inputLen);
byte[] output = new byte[outputLen];
int len = 0;
if (includeAAD)
{
c2.ProcessAadBytes(S, 0, i);
}
if (includePlaintext)
{
len += c2.ProcessBytes(S, 0, i, output, len);
}
len += c2.DoFinal(output, len);
c1.ProcessAadBytes(output, 0, len);
return(len);
}
public override byte[] Encrypt(byte[] input, CryptoKey key)
{
byte[] nonce = GenerateNonce();
IAeadBlockCipher cipher = GetNewAeadBlockCipherInstance();
AeadParameters cipherParameters = GetParameters(key, nonce);
try
{
cipher.Init(true, cipherParameters);
int outputLen = cipher.GetOutputSize(input.Length);
byte[] output = new byte[outputLen + nonce.Length];
int position = cipher.ProcessBytes(input, 0, input.Length, output, 0);
try
{
cipher.DoFinal(output, position);
}
catch (Exception e)
{
throw new AppEncryptionException("unexpected error during encrypt cipher finalization", e);
}
AppendNonce(output, nonce);
return(output);
}
finally
{
ManagedBufferUtils.WipeByteArray(cipherParameters.Key.GetKey());
}
}
public virtual byte[] DecodeCiphertext(long seqNo, byte type, byte[] ciphertext, int offset, int len)
{
if (GetPlaintextLimit(len) < 0)
{
throw new TlsFatalAlert(50);
}
byte[] array = new byte[decryptImplicitNonce.Length + nonce_explicit_length];
Array.Copy(decryptImplicitNonce, 0, array, 0, decryptImplicitNonce.Length);
Array.Copy(ciphertext, offset, array, decryptImplicitNonce.Length, nonce_explicit_length);
int inOff = offset + nonce_explicit_length;
int len2 = len - nonce_explicit_length;
int outputSize = decryptCipher.GetOutputSize(len2);
byte[] array2 = new byte[outputSize];
int num = 0;
byte[] additionalData = GetAdditionalData(seqNo, type, outputSize);
AeadParameters parameters = new AeadParameters(null, 8 * macSize, array, additionalData);
try
{
decryptCipher.Init(forEncryption: false, parameters);
num += decryptCipher.ProcessBytes(ciphertext, inOff, len2, array2, num);
num += decryptCipher.DoFinal(array2, num);
}
catch (Exception alertCause)
{
throw new TlsFatalAlert(20, alertCause);
}
if (num != array2.Length)
{
throw new TlsFatalAlert(80);
}
return(array2);
}
private byte[] SimpleEncrypt(byte[] secretMessage, byte[] key, byte[] nonSecretPayload = null)
{
//User Error Checks
if (key == null || key.Length != KeyBitSize / 8)
{
throw new ArgumentException($"Key needs to be {KeyBitSize} bit!", nameof(key));
}
if (secretMessage == null || secretMessage.Length == 0)
{
throw new ArgumentException(@"Secret Message Required!", nameof(secretMessage));
}
//Non-secret Payload Optional
nonSecretPayload = nonSecretPayload ?? new byte[] { };
//Using random nonce large enough not to repeat
var nonce = new byte[NonceBitSize / 8];
_random.NextBytes(nonce, 0, nonce.Length);
var parameters = new AeadParameters(new KeyParameter(key), MacBitSize, nonce, nonSecretPayload);
_aeadBlockCipher.Init(true, parameters);
//Generate Cipher Text With Auth Tag
var cipherText = new byte[_aeadBlockCipher.GetOutputSize(secretMessage.Length)];
var len = _aeadBlockCipher.ProcessBytes(secretMessage, 0, secretMessage.Length, cipherText, 0);
_aeadBlockCipher.DoFinal(cipherText, len);
//Assemble Message
var combinedStream = new MemoryStream();
using (var binaryWriter = new BinaryWriter(combinedStream))
{
//Prepend Authenticated Payload
binaryWriter.Write(nonSecretPayload);
//Prepend Nonce
binaryWriter.Write(nonce);
//Write Cipher Text
binaryWriter.Write(cipherText);
}
return(combinedStream.ToArray());
}
/// <summary>
/// Decrypts the given encrypted text with an AEAD encryption algorithm
/// </summary>
/// <param name="symmetricBlockAlgorithm">string SymmetricBlockAlgorithm enum, symmetric block algorithm name</param>
/// <param name="symmetricBlockMode">string SymmetricBlockModes enum, symmetric block mode name</param>
/// <param name="key">string Hexa key for the algorithm excecution</param>
/// <param name="macSize">int macSize in bits for MAC length for AEAD Encryption algorithm</param>
/// <param name="nonce">string Hexa nonce for MAC length for AEAD Encryption algorithm</param>
/// <param name="encryptedInput">string Base64 text to decrypt</param>
/// <returns></returns>
public string DoAEADDecrypt(string symmetricBlockAlgorithm, string symmetricBlockMode,
string key, int macSize, string nonce, string encryptedInput)
{
this.error.cleanError();
SymmetricBlockAlgorithm algorithm = SymmetricBlockAlgorithmUtils.getSymmetricBlockAlgorithm(symmetricBlockAlgorithm, this.error);
SymmetricBlockMode mode = SymmetricBlockModeUtils.getSymmetricBlockMode(symmetricBlockMode, this.error);
if (this.error.existsError())
{
return("");
}
IBlockCipher engine = getCipherEngine(algorithm);
IAeadBlockCipher bbc = getAEADCipherMode(engine, mode);
if (this.error.existsError() && !(string.Compare(this.error.Code, "SB016", true) == 0))
{
return("");
}
byte[] nonceBytes = SecurityUtils.GetHexa(nonce, "SB025", this.error);
byte[] keyBytes = SecurityUtils.GetHexa(key, "SB025", this.error);
if (this.HasError())
{
return("");
}
KeyParameter keyParam = new KeyParameter(keyBytes);
AeadParameters AEADparams = new AeadParameters(keyParam, macSize, nonceBytes);
try
{
bbc.Init(false, AEADparams);
}catch (Exception e)
{
this.error.setError("SB030", e.Message);
return("");
}
byte[] out2 = Base64.Decode(encryptedInput);
byte[] comparisonBytes = new byte[bbc.GetOutputSize(out2.Length)];
int length = bbc.ProcessBytes(out2, 0, out2.Length, comparisonBytes, 0);
try
{
bbc.DoFinal(comparisonBytes, length);
}
catch (Exception)
{
this.error.setError("SB012", "AEAD decryption exception");
return("");
}
this.error.cleanError();
// return System.Text.Encoding.UTF8.GetString(comparisonBytes).Trim();
EncodingUtil eu = new EncodingUtil();
this.error = eu.GetError();
return(eu.getString(comparisonBytes));
}
/// <exception cref="IOException"></exception>
public virtual byte[] DecodeCiphertext(long seqNo, byte type, byte[] ciphertext, int offset, int len)
{
if (GetPlaintextLimit(len) < 0)
{
throw new TlsFatalAlert(AlertDescription.decode_error);
}
byte[] nonce = new byte[decryptImplicitNonce.Length + record_iv_length];
switch (nonceMode)
{
case NONCE_RFC5288:
Array.Copy(decryptImplicitNonce, 0, nonce, 0, decryptImplicitNonce.Length);
Array.Copy(ciphertext, offset, nonce, nonce.Length - record_iv_length, record_iv_length);
break;
case NONCE_DRAFT_CHACHA20_POLY1305:
TlsUtilities.WriteUint64(seqNo, nonce, nonce.Length - 8);
for (int i = 0; i < decryptImplicitNonce.Length; ++i)
{
nonce[i] ^= decryptImplicitNonce[i];
}
break;
default:
throw new TlsFatalAlert(AlertDescription.internal_error);
}
int ciphertextOffset = offset + record_iv_length;
int ciphertextLength = len - record_iv_length;
int plaintextLength = decryptCipher.GetOutputSize(ciphertextLength);
byte[] output = new byte[plaintextLength];
int outputPos = 0;
byte[] additionalData = GetAdditionalData(seqNo, type, plaintextLength);
AeadParameters parameters = new AeadParameters(null, 8 * macSize, nonce, additionalData);
try
{
decryptCipher.Init(false, parameters);
outputPos += decryptCipher.ProcessBytes(ciphertext, ciphertextOffset, ciphertextLength, output, outputPos);
outputPos += decryptCipher.DoFinal(output, outputPos);
}
catch (Exception e)
{
throw new TlsFatalAlert(AlertDescription.bad_record_mac, e);
}
if (outputPos != output.Length)
{
// NOTE: Existing AEAD cipher implementations all give exact output lengths
throw new TlsFatalAlert(AlertDescription.internal_error);
}
return(output);
}
public int DoFinal(byte[] output, int outOff)
{
try
{
return(aeadCipher.DoFinal(output, outOff));
}
catch (InvalidCipherTextException e)
{
throw new InvalidOperationException("unable to create MAC tag:" + e.Message, e);
}
}
/// <summary>
/// Decodes the AES-GCM encrypted data according to RFC5288 and RFC5264.
/// (https://tools.ietf.org/html/rfc5288, https://tools.ietf.org/html/rfc5246#page-24).
/// </summary>
public static byte[] DecryptAead(IAeadBlockCipher gcm, Span <byte> writeKeyBytes, Span <byte> nonceBytes, Span <byte> encryptedBytes, Span <byte> additionalData)
{
var writeKey = new KeyParameter(writeKeyBytes.ToArray());
gcm.Init(false, new AeadParameters(writeKey, 128, nonceBytes.ToArray(), additionalData.ToArray()));
var outsize = gcm.GetOutputSize(encryptedBytes.Length);
var plainBytes = new byte[outsize];
var outBytes = gcm.ProcessBytes(encryptedBytes.ToArray(), 0, encryptedBytes.Length, plainBytes, 0);
// finally check MAC:
outBytes += gcm.DoFinal(plainBytes, outBytes);
return(plainBytes);
}
/// <exception cref="IOException"></exception>
public virtual byte[] DecodeCiphertext(long seqNo, byte type, byte[] ciphertext, int offset, int len)
{
if (GetPlaintextLimit(len) < 0)
{
throw new TlsFatalAlert(AlertDescription.decode_error);
}
byte[] nonce = new byte[this.decryptImplicitNonce.Length + 8];
Array.Copy(decryptImplicitNonce, 0, nonce, 0, decryptImplicitNonce.Length);
//Array.Copy(ciphertext, offset, nonce, decryptImplicitNonce.Length, nonce_explicit_length);
if (record_iv_length == 0)
{
TlsUtilities.WriteUint64(seqNo, nonce, decryptImplicitNonce.Length);
}
else
{
Array.Copy(ciphertext, offset, nonce, nonce.Length - record_iv_length, record_iv_length);
}
int ciphertextOffset = offset + record_iv_length;
int ciphertextLength = len - record_iv_length;
int plaintextLength = decryptCipher.GetOutputSize(ciphertextLength);
byte[] output = new byte[plaintextLength];
int outputPos = 0;
byte[] additionalData = GetAdditionalData(seqNo, type, plaintextLength);
AeadParameters parameters = new AeadParameters(null, 8 * macSize, nonce, additionalData);
try
{
decryptCipher.Init(false, parameters);
outputPos += decryptCipher.ProcessBytes(ciphertext, ciphertextOffset, ciphertextLength, output, outputPos);
outputPos += decryptCipher.DoFinal(output, outputPos);
}
catch (Exception e)
{
throw new TlsFatalAlert(AlertDescription.bad_record_mac, e);
}
if (outputPos != output.Length)
{
// NOTE: Existing AEAD cipher implementations all give exact output lengths
throw new TlsFatalAlert(AlertDescription.internal_error);
}
return(output);
}
private Byte[] Decrypt(IAeadBlockCipher cipher, Byte[] data)
{
var size = cipher.GetOutputSize(data.Length);
var outBuffer = new Byte[size];
var off1 = cipher.ProcessBytes(data, 0, data.Length, outBuffer, 0);
//cipher.DoFinal(data, 0, data.Length, outBuffer, 0);
var off2 = cipher.DoFinal(outBuffer, off1);
var result = new Byte[off2];
Array.Copy(outBuffer, 0, result, 0, result.Length);
//String asString = Encoding.ASCII.GetString(result);
//Console.WriteLine(asString);
return(result);
}
private void CheckTestCase(IAeadBlockCipher encCipher, IAeadBlockCipher decCipher, string testName,
int macLengthBytes, byte[] P, byte[] C)
{
byte[] tag = Arrays.CopyOfRange(C, C.Length - macLengthBytes, C.Length);
{
byte[] enc = new byte[encCipher.GetOutputSize(P.Length)];
int len = encCipher.ProcessBytes(P, 0, P.Length, enc, 0);
len += encCipher.DoFinal(enc, len);
if (enc.Length != len)
{
Fail("encryption reported incorrect length: " + testName);
}
if (!AreEqual(C, enc))
{
Fail("incorrect encrypt in: " + testName);
}
if (!AreEqual(tag, encCipher.GetMac()))
{
Fail("getMac() not the same as the appended tag: " + testName);
}
}
{
byte[] dec = new byte[decCipher.GetOutputSize(C.Length)];
int len = decCipher.ProcessBytes(C, 0, C.Length, dec, 0);
len += decCipher.DoFinal(dec, len);
if (dec.Length != len)
{
Fail("decryption reported incorrect length: " + testName);
}
if (!AreEqual(P, dec))
{
Fail("incorrect decrypt in: " + testName);
}
if (!AreEqual(tag, decCipher.GetMac()))
{
Fail("getMac() not the same as the appended tag: " + testName);
}
}
}
/// <exception cref="IOException"></exception>
public virtual byte[] EncodePlaintext(long seqNo, byte type, byte[] plaintext, int offset, int len)
{
byte[] nonce = new byte[this.encryptImplicitNonce.Length + 8];
Array.Copy(encryptImplicitNonce, 0, nonce, 0, encryptImplicitNonce.Length);
/*
* RFC 5288/6655: The nonce_explicit MAY be the 64-bit sequence number.
* draft-zauner-tls-aes-ocb-03: uses the sequence number (not included in message).
*
* (May need review for other AEAD ciphers).
*/
TlsUtilities.WriteUint64(seqNo, nonce, encryptImplicitNonce.Length);
int plaintextOffset = offset;
int plaintextLength = len;
int ciphertextLength = encryptCipher.GetOutputSize(plaintextLength);
byte[] output = new byte[record_iv_length + ciphertextLength];
if (record_iv_length != 0)
{
Array.Copy(nonce, nonce.Length - record_iv_length, output, 0, record_iv_length);
}
int outputPos = record_iv_length;
byte[] additionalData = GetAdditionalData(seqNo, type, plaintextLength);
AeadParameters parameters = new AeadParameters(null, 8 * macSize, nonce, additionalData);
try
{
encryptCipher.Init(true, parameters);
outputPos += encryptCipher.ProcessBytes(plaintext, plaintextOffset, plaintextLength, output, outputPos);
outputPos += encryptCipher.DoFinal(output, outputPos);
}
catch (Exception e)
{
throw new TlsFatalAlert(AlertDescription.internal_error, e);
}
if (outputPos != output.Length)
{
// NOTE: Existing AEAD cipher implementations all give exact output lengths
throw new TlsFatalAlert(AlertDescription.internal_error);
}
return(output);
}
public override byte[] Decrypt(byte[] input, CryptoKey key)
{
byte[] nonce = GetAppendedNonce(input);
IAeadBlockCipher cipher = GetNewAeadBlockCipherInstance();
AeadParameters cipherParameters = GetParameters(key, nonce);
try
{
cipher.Init(false, cipherParameters);
int cipherTextLength = input.Length - nonce.Length;
int outputLen = cipher.GetOutputSize(cipherTextLength);
byte[] output = new byte[outputLen];
int position = cipher.ProcessBytes(input, 0, cipherTextLength, output, 0);
try
{
position += cipher.DoFinal(output, position);
}
catch (Exception e)
{
throw new AppEncryptionException("unexpected error during decrypt cipher finalization", e);
}
if (position != outputLen)
{
if (Debug.On)
#pragma warning disable 162
{
Logger.LogError("position {position} not equal to outputLength {outputLen}", position, outputLen);
}
#pragma warning restore 162
throw new AppEncryptionException("unexpected error during decrypt cipher finalization");
}
return(output);
}
finally
{
ManagedBufferUtils.WipeByteArray(cipherParameters.Key.GetKey());
}
}
private void RunLongerTestCase(int keyLen, int tagLen, string expectedOutputHex)
{
byte[] expectedOutput = Hex.Decode(expectedOutputHex);
byte[] keyBytes = new byte[keyLen / 8];
keyBytes[keyBytes.Length - 1] = (byte)tagLen;
KeyParameter key = new KeyParameter(keyBytes);
IAeadBlockCipher c1 = InitOcbCipher(true, new AeadParameters(key, tagLen, CreateNonce(385)));
IAeadBlockCipher c2 = CreateOcbCipher();
long total = 0;
byte[] S = new byte[128];
uint n = 0;
for (int i = 0; i < 128; ++i)
{
c2.Init(true, new AeadParameters(key, tagLen, CreateNonce(++n)));
total += UpdateCiphers(c1, c2, S, i, true, true);
c2.Init(true, new AeadParameters(key, tagLen, CreateNonce(++n)));
total += UpdateCiphers(c1, c2, S, i, false, true);
c2.Init(true, new AeadParameters(key, tagLen, CreateNonce(++n)));
total += UpdateCiphers(c1, c2, S, i, true, false);
}
long expectedTotal = 16256 + (48 * tagLen);
if (total != expectedTotal)
{
Fail("test generated the wrong amount of input: " + total);
}
byte[] output = new byte[c1.GetOutputSize(0)];
c1.DoFinal(output, 0);
if (!AreEqual(expectedOutput, output))
{
Fail("incorrect encrypt in long-form test");
}
}
/// <summary>
/// Finishes this instance.
/// </summary>
/// <exception cref="InvalidCryptoDataException"></exception>
public override void Finish()
{
try
{
if (!_init && _encrypt)
{
_output.Write(_nonce, 0, _nonce.Length);
_initFunc(_nonce, _cipher, _header, _encrypt);
_init = true;
}
var buffLen = _cipher.GetOutputSize(_inLen) - _outLen;
var buffer = new byte[buffLen];
var writeLen = _cipher.DoFinal(buffer, 0);
_output.Write(buffer, 0, writeLen);
Secure.Clear(buffer);
}
catch (InvalidCipherTextException ex)
{
throw new InvalidCryptoDataException(ex.Message);
}
}
/**
* Process the last block in the buffer.
*
* @param out the array the block currently being held is copied into.
* @param outOff the offset at which the copying starts.
* @return the number of output bytes copied to out.
* @exception DataLengthException if there is insufficient space in out for
* the output, or the input is not block size aligned and should be.
* @exception InvalidOperationException if the underlying cipher is not
* initialised.
* @exception InvalidCipherTextException if padding is expected and not found.
* @exception DataLengthException if the input is not block size
* aligned.
*/
public override int DoFinal(
byte[] output,
int outOff)
{
return(cipher.DoFinal(output, outOff));
}
private void ivParamTest(
int count,
IAeadBlockCipher eax,
byte[] k,
byte[] n)
{
byte[] p = Encoding.ASCII.GetBytes("hello world!!");
eax.Init(true, new ParametersWithIV(new KeyParameter(k), n));
byte[] enc = new byte[p.Length + 8];
int len = eax.ProcessBytes(p, 0, p.Length, enc, 0);
len += eax.DoFinal(enc, len);
eax.Init(false, new ParametersWithIV(new KeyParameter(k), n));
byte[] tmp = new byte[enc.Length];
len = eax.ProcessBytes(enc, 0, enc.Length, tmp, 0);
len += eax.DoFinal(tmp, len);
byte[] dec = new byte[len];
Array.Copy(tmp, 0, dec, 0, len);
if (!AreEqual(p, dec))
{
Fail("decrypted stream fails to match in test " + count);
}
}
/********EXTERNAL OBJECT PUBLIC METHODS - BEGIN ********/
/// <summary>
/// Encrypts the given text with an AEAD encryption algorithm
/// </summary>
/// <param name="symmetricBlockAlgorithm">string SymmetricBlockAlgorithm enum, symmetric block algorithm name</param>
/// <param name="symmetricBlockMode">string SymmetricBlockModes enum, symmetric block mode name</param>
/// <param name="key">string Hexa key for the algorithm excecution</param>
/// <param name="macSize">int macSize in bits for MAC length for AEAD Encryption algorithm</param>
/// <param name="nonce">string Hexa nonce for MAC length for AEAD Encryption algorithm</param>
/// <param name="plainText"> string UTF-8 plain text to encrypt</param>
/// <returns></returns>
public string DoAEADEncrypt(string symmetricBlockAlgorithm, string symmetricBlockMode,
string key, int macSize, string nonce, string plainText)
{
this.error.cleanError();
SymmetricBlockAlgorithm algorithm = SymmetricBlockAlgorithmUtils.getSymmetricBlockAlgorithm(symmetricBlockAlgorithm, this.error);
SymmetricBlockMode mode = SymmetricBlockModeUtils.getSymmetricBlockMode(symmetricBlockMode, this.error);
if (this.error.existsError())
{
return("");
}
IBlockCipher engine = getCipherEngine(algorithm);
IAeadBlockCipher bbc = getAEADCipherMode(engine, mode);
if (this.error.existsError() && !(string.Compare(this.error.Code, "SB016", true) == 0))
{
return("");
}
byte[] nonceBytes = SecurityUtils.GetHexa(nonce, "SB024", this.error);
byte[] keyBytes = SecurityUtils.GetHexa(key, "SB024", this.error);
if (this.HasError())
{
return("");
}
KeyParameter keyParam = new KeyParameter(keyBytes);
AeadParameters AEADparams = new AeadParameters(keyParam, macSize, nonceBytes);
try
{
bbc.Init(true, AEADparams);
}catch (Exception e)
{
this.error.setError("SB029", e.Message);
return("");
}
EncodingUtil eu = new EncodingUtil();
byte[] inputBytes = eu.getBytes(plainText);
if (eu.GetError().existsError())
{
this.error = eu.GetError();
return("");
}
byte[] outputBytes = new byte[bbc.GetOutputSize(inputBytes.Length)];
int length = bbc.ProcessBytes(inputBytes, 0, inputBytes.Length, outputBytes, 0);
try
{
bbc.DoFinal(outputBytes, length);
}
catch (Exception)
{
this.error.setError("SB010", "AEAD encryption exception");
return("");
}
string result = Base64.ToBase64String(outputBytes);
if (result == null || result.Length == 0)
{
this.error.setError("SB011", "Error encoding base64");
return("");
}
this.error.cleanError();
return(result);
}
private void CheckTestCase(IAeadBlockCipher encCipher, IAeadBlockCipher decCipher, string testName,
int macLengthBytes, byte[] P, byte[] C)
{
byte[] tag = Arrays.CopyOfRange(C, C.Length - macLengthBytes, C.Length);
{
byte[] enc = new byte[encCipher.GetOutputSize(P.Length)];
int len = encCipher.ProcessBytes(P, 0, P.Length, enc, 0);
len += encCipher.DoFinal(enc, len);
if (enc.Length != len)
{
Fail("encryption reported incorrect length: " + testName);
}
if (!AreEqual(C, enc))
{
Fail("incorrect encrypt in: " + testName);
}
if (!AreEqual(tag, encCipher.GetMac()))
{
Fail("getMac() not the same as the appended tag: " + testName);
}
}
{
byte[] dec = new byte[decCipher.GetOutputSize(C.Length)];
int len = decCipher.ProcessBytes(C, 0, C.Length, dec, 0);
len += decCipher.DoFinal(dec, len);
if (dec.Length != len)
{
Fail("decryption reported incorrect length: " + testName);
}
if (!AreEqual(P, dec))
{
Fail("incorrect decrypt in: " + testName);
}
if (!AreEqual(tag, decCipher.GetMac()))
{
Fail("getMac() not the same as the appended tag: " + testName);
}
}
}
private int UpdateCiphers(IAeadBlockCipher c1, IAeadBlockCipher c2, byte[] S, int i,
bool includeAAD, bool includePlaintext)
{
int inputLen = includePlaintext ? i : 0;
int outputLen = c2.GetOutputSize(inputLen);
byte[] output = new byte[outputLen];
int len = 0;
if (includeAAD) {
c2.ProcessAadBytes(S, 0, i);
}
if (includePlaintext) {
len += c2.ProcessBytes(S, 0, i, output, len);
}
len += c2.DoFinal(output, len);
c1.ProcessAadBytes(output, 0, len);
return len;
}
private void RandomTest(SecureRandom srng)
{
int kLength = 16 + 8 * (System.Math.Abs(srng.NextInt()) % 3);
byte[] K = new byte[kLength];
srng.NextBytes(K);
int pLength = (int)((uint)srng.NextInt() >> 16);
byte[] P = new byte[pLength];
srng.NextBytes(P);
int aLength = (int)((uint)srng.NextInt() >> 24);
byte[] A = new byte[aLength];
srng.NextBytes(A);
int saLength = (int)((uint)srng.NextInt() >> 24);
byte[] SA = new byte[saLength];
srng.NextBytes(SA);
int ivLength = 1 + NextInt(srng, 15);
byte[] IV = new byte[ivLength];
srng.NextBytes(IV);
AeadParameters parameters = new AeadParameters(new KeyParameter(K), 16 * 8, IV, A);
IAeadBlockCipher cipher = InitOcbCipher(true, parameters);
byte[] C = new byte[cipher.GetOutputSize(P.Length)];
int predicted = cipher.GetUpdateOutputSize(P.Length);
int split = NextInt(srng, SA.Length + 1);
cipher.ProcessAadBytes(SA, 0, split);
int len = cipher.ProcessBytes(P, 0, P.Length, C, 0);
cipher.ProcessAadBytes(SA, split, SA.Length - split);
if (predicted != len)
{
Fail("encryption reported incorrect update length in randomised test");
}
len += cipher.DoFinal(C, len);
if (C.Length != len)
{
Fail("encryption reported incorrect length in randomised test");
}
byte[] encT = cipher.GetMac();
byte[] tail = new byte[C.Length - P.Length];
Array.Copy(C, P.Length, tail, 0, tail.Length);
if (!AreEqual(encT, tail))
{
Fail("stream contained wrong mac in randomised test");
}
cipher.Init(false, parameters);
byte[] decP = new byte[cipher.GetOutputSize(C.Length)];
predicted = cipher.GetUpdateOutputSize(C.Length);
split = NextInt(srng, SA.Length + 1);
cipher.ProcessAadBytes(SA, 0, split);
len = cipher.ProcessBytes(C, 0, C.Length, decP, 0);
cipher.ProcessAadBytes(SA, split, SA.Length - split);
if (predicted != len)
{
Fail("decryption reported incorrect update length in randomised test");
}
len += cipher.DoFinal(decP, len);
if (!AreEqual(P, decP))
{
Fail("incorrect decrypt in randomised test");
}
byte[] decT = cipher.GetMac();
if (!AreEqual(encT, decT))
{
Fail("decryption produced different mac from encryption");
}
//
// key reuse test
//
cipher.Init(false, AeadTestUtilities.ReuseKey(parameters));
decP = new byte[cipher.GetOutputSize(C.Length)];
split = NextInt(srng, SA.Length + 1);
cipher.ProcessAadBytes(SA, 0, split);
len = cipher.ProcessBytes(C, 0, C.Length, decP, 0);
cipher.ProcessAadBytes(SA, split, SA.Length - split);
len += cipher.DoFinal(decP, len);
if (!AreEqual(P, decP))
{
Fail("incorrect decrypt in randomised test");
}
decT = cipher.GetMac();
if (!AreEqual(encT, decT))
{
Fail("decryption produced different mac from encryption");
}
}
