public static void TripleDESDefaults()
{
using (TripleDES des = TripleDESFactory.Create())
{
Assert.Equal(192, des.KeySize);
Assert.Equal(64, des.BlockSize);
}
}
public static void TripleDESInvalidKeySizes()
{
using (TripleDES des = TripleDESFactory.Create())
{
Assert.Throws <CryptographicException>(() => des.KeySize = 128 - des.BlockSize);
Assert.Throws <CryptographicException>(() => des.KeySize = 192 + des.BlockSize);
}
}
private static void TestTripleDESTransformDirectKey(
CipherMode cipherMode,
PaddingMode paddingMode,
byte[] key,
byte[] iv,
byte[] plainBytes,
byte[] cipherBytes,
int?feedbackSize = default)
{
byte[] liveEncryptBytes;
byte[] liveDecryptBytes;
byte[] liveOneShotDecryptBytes = null;
byte[] liveOneShotEncryptBytes = null;
using (TripleDES tdes = TripleDESFactory.Create())
{
tdes.Mode = cipherMode;
tdes.Padding = paddingMode;
tdes.Key = key;
if (feedbackSize.HasValue)
{
tdes.FeedbackSize = feedbackSize.Value;
}
liveEncryptBytes = TripleDESEncryptDirectKey(tdes, key, iv, plainBytes);
liveDecryptBytes = TripleDESDecryptDirectKey(tdes, key, iv, cipherBytes);
if (cipherMode == CipherMode.ECB)
{
liveOneShotDecryptBytes = tdes.DecryptEcb(cipherBytes, paddingMode);
liveOneShotEncryptBytes = tdes.EncryptEcb(plainBytes, paddingMode);
}
else if (cipherMode == CipherMode.CBC)
{
liveOneShotDecryptBytes = tdes.DecryptCbc(cipherBytes, iv, paddingMode);
liveOneShotEncryptBytes = tdes.EncryptCbc(plainBytes, iv, paddingMode);
}
else if (cipherMode == CipherMode.CFB)
{
liveOneShotDecryptBytes = tdes.DecryptCfb(cipherBytes, iv, paddingMode, feedbackSizeInBits: feedbackSize.Value);
liveOneShotEncryptBytes = tdes.EncryptCfb(plainBytes, iv, paddingMode, feedbackSizeInBits: feedbackSize.Value);
}
if (liveOneShotDecryptBytes is not null)
{
Assert.Equal(plainBytes, liveOneShotDecryptBytes);
}
if (liveOneShotEncryptBytes is not null)
{
Assert.Equal(cipherBytes, liveOneShotEncryptBytes);
}
}
Assert.Equal(cipherBytes, liveEncryptBytes);
Assert.Equal(plainBytes, liveDecryptBytes);
}
public static void TripleDESGenerate128Key()
{
using (TripleDES des = TripleDESFactory.Create())
{
des.KeySize = 128;
byte[] key = des.Key;
Assert.Equal(128, key.Length * 8);
}
}
public static void Windows7DoesNotSupportCFB64()
{
using (TripleDES tdes = TripleDESFactory.Create())
{
tdes.GenerateKey();
tdes.Mode = CipherMode.CFB;
tdes.FeedbackSize = 64;
Assert.ThrowsAny <CryptographicException>(() => tdes.CreateDecryptor());
Assert.ThrowsAny <CryptographicException>(() => tdes.CreateEncryptor());
}
}
public static void ValidCFBFeedbackSizes(int feedbackSize)
{
using (TripleDES tdes = TripleDESFactory.Create())
{
tdes.GenerateKey();
tdes.Mode = CipherMode.CFB;
tdes.FeedbackSize = feedbackSize;
using var decryptor = tdes.CreateDecryptor();
using var encryptor = tdes.CreateEncryptor();
Assert.NotNull(decryptor);
Assert.NotNull(encryptor);
}
}
public static void Cfb8ModeCanDepadCfb64Padding()
{
using (TripleDES tdes = TripleDESFactory.Create())
{
// 1, 2, 3, 4, 5 encrypted with CFB8 but padded with block-size padding.
byte[] ciphertext = "97F1CE6A6D869A85".HexToByteArray();
tdes.Key = "3D1ECCEE6C99B029950ED23688AA229AF85177421609F7BF".HexToByteArray();
tdes.IV = new byte[8];
tdes.Padding = PaddingMode.PKCS7;
tdes.Mode = CipherMode.CFB;
tdes.FeedbackSize = 8;
using ICryptoTransform transform = tdes.CreateDecryptor();
byte[] decrypted = transform.TransformFinalBlock(ciphertext, 0, ciphertext.Length);
Assert.Equal(new byte[] { 1, 2, 3, 4, 5 }, decrypted);
}
}
public static void EcbRoundtrip(byte[] plaintext, byte[] ciphertext, PaddingMode padding)
{
using (TripleDES tdes = TripleDESFactory.Create())
{
tdes.Key = s_tdes192OneShotKey;
// Even though we have set the instance to use CFB, the Ecb one shots should
// always be done in ECB.
tdes.FeedbackSize = 8;
tdes.Mode = CipherMode.CFB;
tdes.Padding = padding == PaddingMode.None ? PaddingMode.PKCS7 : PaddingMode.None;
byte[] encrypted = tdes.EncryptEcb(plaintext, padding);
byte[] decrypted = tdes.DecryptEcb(encrypted, padding);
if (padding == PaddingMode.Zeros)
{
Assert.Equal(plaintext, decrypted[..plaintext.Length]);
public static void VerifyNetFxCompat_CFB8_PKCS7Padding()
{
// .NET Framework would always pad to the nearest block
// with CFB8 and PKCS7 padding even though the shortest possible
// padding is always 1 byte. This ensures we can continue to decrypt
// .NET Framework encrypted data with the excessive padding.
byte[] key = "531bd715cbf785c10169b6e4926562b8e1e5c4c8884ed791".HexToByteArray();
byte[] iv = "dbeba40532a5304a".HexToByteArray();
byte[] plaintext = "70656e6e79".HexToByteArray();
byte[] ciphertext = "8798c2da055c9ea0".HexToByteArray();
using TripleDES tdes = TripleDESFactory.Create();
tdes.Mode = CipherMode.CFB;
tdes.Padding = PaddingMode.PKCS7;
tdes.FeedbackSize = 8;
byte[] decrypted = TripleDESDecryptDirectKey(tdes, key, iv, ciphertext);
Assert.Equal(plaintext, decrypted);
}
public static void TripleDESRoundTrip192BitsPKCS7ECB()
{
byte[] key = "155425f12109cd89378795a4ca337b3264689dca497ba2fa".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.Padding = PaddingMode.PKCS7;
alg.Mode = CipherMode.ECB;
byte[] plainText = "5bd3c4e16a723a17ac60dd0efdb158e269cddfd0fa".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = "7b8d982ee0c14821daf1b8cf4e407c2eb328627b696ac36e".HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "5bd3c4e16a723a17ac60dd0efdb158e269cddfd0fa".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTrip192BitsISO10126ECB()
{
byte[] key = "9da5b265179d65f634dfc95513f25094411e51bb3be877ef".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.Padding = PaddingMode.ISO10126;
alg.Mode = CipherMode.ECB;
byte[] plainText = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
// the padding data for ISO10126 is made up of random bytes, so we cannot actually test
// the full encrypted text. We need to strip the padding and then compare
byte[] decrypted = alg.Decrypt(cipher);
Assert.Equal <byte>(plainText, decrypted);
}
}
public static void TripleDESRoundTrip192BitsZerosECB()
{
byte[] key = "9da5b265179d65f634dfc95513f25094411e51bb3be877ef".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.Padding = PaddingMode.Zeros;
alg.Mode = CipherMode.ECB;
byte[] plainText = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = "149ec32f558b27c7e4151e340d8184f18b4e25d2518f69d9".HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8000000".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTrip192BitsNoneECB()
{
byte[] key = "c5629363d957054eba793093b83739bb78711db221a82379".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.Padding = PaddingMode.None;
alg.Mode = CipherMode.ECB;
byte[] plainText = "de7d2dddea96b691e979e647dc9d3ca27d7f1ad673ca9570".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = "e56f72478c7479d169d54c0548b744af5b53efb1cdd26037".HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "de7d2dddea96b691e979e647dc9d3ca27d7f1ad673ca9570".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void ValidCFBFeedbackSizes(int feedbackSize)
{
// Windows 7 only supports CFB8.
if (feedbackSize != 8 && PlatformDetection.IsWindows7)
{
return;
}
using (TripleDES tdes = TripleDESFactory.Create())
{
tdes.GenerateKey();
tdes.Mode = CipherMode.CFB;
tdes.FeedbackSize = feedbackSize;
using var decryptor = tdes.CreateDecryptor();
using var encryptor = tdes.CreateEncryptor();
Assert.NotNull(decryptor);
Assert.NotNull(encryptor);
}
}
public static void TripleDESRoundTrip192BitsNoneCBC()
{
byte[] key = "b43eaf0260813fb47c87ae073a146006d359ad04061eb0e6".HexToByteArray();
byte[] iv = "5fbc5bc21b8597d8".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.IV = iv;
alg.Padding = PaddingMode.None;
alg.Mode = CipherMode.CBC;
byte[] plainText = "79a86903608e133e020e1dc68c9835250c2f17b0ebeed91b".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = "dea36279600f19c602b6ed9bf3ffdac5ebf25c1c470eb61c".HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "79a86903608e133e020e1dc68c9835250c2f17b0ebeed91b".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTrip192BitsZerosCBC()
{
byte[] key = "5e970c0d2323d53b28fa3de507d6d20f9f0cd97123398b4d".HexToByteArray();
byte[] iv = "95498b5bf570f4c8".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.IV = iv;
alg.Padding = PaddingMode.Zeros;
alg.Mode = CipherMode.CBC;
byte[] plainText = "f9e9a1385bf3bd056d6a06eac662736891bd3e6837".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = "65f3dc211876a9daad238aa7d0c7ed7a3662296faf77dff9".HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "f9e9a1385bf3bd056d6a06eac662736891bd3e6837000000".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTrip192BitsPKCS7CBC()
{
byte[] key = "6b42da08f93e819fbd26fce0785b0eec3d0cb6bfa053c505".HexToByteArray();
byte[] iv = "8fc67ce5e7f28cde".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.IV = iv;
alg.Padding = PaddingMode.PKCS7;
alg.Mode = CipherMode.CBC;
byte[] plainText = "e867f915e275eab27d6951165d26dec6dd0acafcfc".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = "446f57875e107702afde16b57eaf250b87b8110bef29af89".HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "e867f915e275eab27d6951165d26dec6dd0acafcfc".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESReuseEncryptorDecryptor()
{
byte[] key = "6b42da08f93e819fbd26fce0785b0eec3d0cb6bfa053c505".HexToByteArray();
byte[] iv = "8fc67ce5e7f28cde".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.IV = iv;
alg.Padding = PaddingMode.PKCS7;
alg.Mode = CipherMode.CBC;
using (ICryptoTransform encryptor = alg.CreateEncryptor())
using (ICryptoTransform decryptor = alg.CreateDecryptor())
{
for (int i = 0; i < 2; i++)
{
byte[] plainText1 = "e867f915e275eab27d6951165d26dec6dd0acafcfc".HexToByteArray();
byte[] cipher1 = encryptor.Transform(plainText1);
byte[] expectedCipher1 = "446f57875e107702afde16b57eaf250b87b8110bef29af89".HexToByteArray();
Assert.Equal <byte>(expectedCipher1, cipher1);
byte[] decrypted1 = decryptor.Transform(cipher1);
byte[] expectedDecrypted1 = "e867f915e275eab27d6951165d26dec6dd0acafcfc".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted1, decrypted1);
byte[] plainText2 = "54686973206973206120736563726574206d657373616765".HexToByteArray();
byte[] cipher2 = encryptor.Transform(plainText2);
byte[] expectedCipher2 = "da6af8adc5d934c24943176db82eef34aa027c93e9dbe52dc5f1fa64fef4061c".HexToByteArray();
Assert.Equal <byte>(expectedCipher2, cipher2);
byte[] decrypted2 = decryptor.Transform(cipher2);
byte[] expectedDecrypted2 = "54686973206973206120736563726574206d657373616765".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted2, decrypted2);
}
}
}
}
public static void TripleDESRoundTripISO10126ECB(int keySize, string keyHex)
{
byte[] key = keyHex.HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
Assert.Equal(keySize, alg.KeySize);
alg.Padding = PaddingMode.ISO10126;
alg.Mode = CipherMode.ECB;
byte[] plainText = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
// the padding data for ISO10126 is made up of random bytes, so we cannot actually test
// the full encrypted text. We need to strip the padding and then compare
byte[] decrypted = alg.Decrypt(cipher);
Assert.Equal <byte>(plainText, decrypted);
}
}
public static void TripleDESRoundTripNoneECB(int keySize, string expectedCipherHex, string keyHex)
{
byte[] key = keyHex.HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
Assert.Equal(keySize, alg.KeySize);
alg.Padding = PaddingMode.None;
alg.Mode = CipherMode.ECB;
byte[] plainText = "de7d2dddea96b691e979e647dc9d3ca27d7f1ad673ca9570".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = expectedCipherHex.HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "de7d2dddea96b691e979e647dc9d3ca27d7f1ad673ca9570".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTripPKCS7ECB(int keySize, string expectedCipherHex, string keyHex)
{
byte[] key = keyHex.HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
Assert.Equal(keySize, alg.KeySize);
alg.Padding = PaddingMode.PKCS7;
alg.Mode = CipherMode.ECB;
byte[] plainText = "5bd3c4e16a723a17ac60dd0efdb158e269cddfd0fa".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = expectedCipherHex.HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "5bd3c4e16a723a17ac60dd0efdb158e269cddfd0fa".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTripZerosECB(int keySize, string expectedCipherHex, string keyHex)
{
byte[] key = keyHex.HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
Assert.Equal(keySize, alg.KeySize);
alg.Padding = PaddingMode.Zeros;
alg.Mode = CipherMode.ECB;
byte[] plainText = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = expectedCipherHex.HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8000000".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void EncryptWithLargeOutputBuffer(bool blockAlignedOutput)
{
using (TripleDES alg = TripleDESFactory.Create())
using (ICryptoTransform xform = alg.CreateEncryptor())
{
// 8 blocks, plus maybe three bytes
int outputPadding = blockAlignedOutput ? 0 : 3;
byte[] output = new byte[alg.BlockSize + outputPadding];
// 2 blocks of 0x00
byte[] input = new byte[alg.BlockSize / 4];
int outputOffset = 0;
outputOffset += xform.TransformBlock(input, 0, input.Length, output, outputOffset);
byte[] overflow = xform.TransformFinalBlock(Array.Empty <byte>(), 0, 0);
Buffer.BlockCopy(overflow, 0, output, outputOffset, overflow.Length);
outputOffset += overflow.Length;
Assert.Equal(3 * (alg.BlockSize / 8), outputOffset);
string outputAsHex = output.ByteArrayToHex();
Assert.NotEqual(new string('0', outputOffset * 2), outputAsHex.Substring(0, outputOffset * 2));
Assert.Equal(new string('0', (output.Length - outputOffset) * 2), outputAsHex.Substring(outputOffset * 2));
}
}
public static void TripleDESRoundTripNoneCBC(int keySize, string expectedCipherHex, string keyHex)
{
byte[] key = keyHex.HexToByteArray();
byte[] iv = "5fbc5bc21b8597d8".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
Assert.Equal(keySize, alg.KeySize);
alg.IV = iv;
alg.Padding = PaddingMode.None;
alg.Mode = CipherMode.CBC;
byte[] plainText = "79a86903608e133e020e1dc68c9835250c2f17b0ebeed91b".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = expectedCipherHex.HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "79a86903608e133e020e1dc68c9835250c2f17b0ebeed91b".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTripPKCS7CBC(int keySize, string expectedCipherHex, string keyHex)
{
byte[] key = keyHex.HexToByteArray();
byte[] iv = "8fc67ce5e7f28cde".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
Assert.Equal(keySize, alg.KeySize);
alg.IV = iv;
alg.Padding = PaddingMode.PKCS7;
alg.Mode = CipherMode.CBC;
byte[] plainText = "e867f915e275eab27d6951165d26dec6dd0acafcfc".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = expectedCipherHex.HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "e867f915e275eab27d6951165d26dec6dd0acafcfc".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDESRoundTripZerosCBC(int keySize, string expectedCipherHex, string keyHex)
{
byte[] key = keyHex.HexToByteArray();
byte[] iv = "95498b5bf570f4c8".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
Assert.Equal(keySize, alg.KeySize);
alg.IV = iv;
alg.Padding = PaddingMode.Zeros;
alg.Mode = CipherMode.CBC;
byte[] plainText = "f9e9a1385bf3bd056d6a06eac662736891bd3e6837".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = expectedCipherHex.HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "f9e9a1385bf3bd056d6a06eac662736891bd3e6837000000".HexToByteArray();
Assert.Equal <byte>(expectedDecrypted, decrypted);
}
}
public static void TripleDES_FailureToRoundTrip192Bits_DifferentPadding_ANSIX923_ZerosECB()
{
byte[] key = "9da5b265179d65f634dfc95513f25094411e51bb3be877ef".HexToByteArray();
using (TripleDES alg = TripleDESFactory.Create())
{
alg.Key = key;
alg.Padding = PaddingMode.ANSIX923;
alg.Mode = CipherMode.ECB;
byte[] plainText = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8".HexToByteArray();
byte[] cipher = alg.Encrypt(plainText);
byte[] expectedCipher = "149ec32f558b27c7e4151e340d8184f1c90f0a499e20fda9".HexToByteArray();
Assert.Equal <byte>(expectedCipher, cipher);
alg.Padding = PaddingMode.Zeros;
byte[] decrypted = alg.Decrypt(cipher);
byte[] expectedDecrypted = "77a8b2efb45addb38d7ef3aa9e6ab5d71957445ab8".HexToByteArray();
// They should not decrypt to the same value
Assert.NotEqual <byte>(plainText, decrypted);
}
}
public static void EncryptorReuse_LeadsToSameResults(CipherMode cipherMode, int feedbackSize)
{
// AppleCCCryptor does not allow calling Reset on CFB cipher.
// this test validates that the behavior is taken into consideration.
var input = "b72606c98d8e4fabf08839abf7a0ac61".HexToByteArray();
using (TripleDES tdes = TripleDESFactory.Create())
{
tdes.Mode = cipherMode;
if (feedbackSize > 0)
{
tdes.FeedbackSize = feedbackSize;
}
using (ICryptoTransform transform = tdes.CreateEncryptor())
{
byte[] output1 = transform.TransformFinalBlock(input, 0, input.Length);
byte[] output2 = transform.TransformFinalBlock(input, 0, input.Length);
Assert.Equal(output1, output2);
}
}
}
protected override SymmetricAlgorithm CreateAlgorithm() => TripleDESFactory.Create();