public static void InvalidCFBFeedbackSizes(int feedbackSize, bool discoverableInSetter)
{
using (RC2 rc2 = RC2Factory.Create())
{
rc2.GenerateKey();
rc2.Mode = CipherMode.CFB;
if (discoverableInSetter)
{
// there are some key sizes that are invalid for any of the modes,
// so the exception is thrown in the setter
Assert.Throws <CryptographicException>(() =>
{
rc2.FeedbackSize = feedbackSize;
});
}
else
{
rc2.FeedbackSize = feedbackSize;
// however, for CFB only few sizes are valid. Those should throw in the
// actual RC2 instantiation.
Assert.Throws <CryptographicException>(() => rc2.CreateDecryptor());
Assert.Throws <CryptographicException>(() => rc2.CreateEncryptor());
}
}
}
public static void DecryptorReuse_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 = "896072ab28e5fdfc".HexToByteArray();
var key = "3000000000000000".HexToByteArray();
var iv = "3000000000000000".HexToByteArray();
using (RC2 rc2 = RC2Factory.Create())
{
rc2.Mode = cipherMode;
rc2.Key = key;
rc2.IV = iv;
rc2.Padding = PaddingMode.None;
if (feedbackSize > 0)
{
rc2.FeedbackSize = feedbackSize;
}
using (ICryptoTransform transform = rc2.CreateDecryptor())
{
byte[] output1 = transform.TransformFinalBlock(input, 0, input.Length);
byte[] output2 = transform.TransformFinalBlock(input, 0, input.Length);
Assert.Equal(output1, output2);
}
}
}
public static void MultipleBlockDecryptTransform(bool blockAlignedOutput)
{
const string ExpectedOutput = "This is a test";
int outputPadding = blockAlignedOutput ? 0 : 3;
byte[] key = "0123456789ABCDEF".HexToByteArray();
byte[] iv = "0123456789ABCDEF".HexToByteArray();
byte[] outputBytes = new byte[iv.Length * 2 + outputPadding];
byte[] input = "DB5400368C7E67FF5F9E1FA99641EB69".HexToByteArray();
int outputOffset = 0;
using (RC2 alg = RC2Factory.Create())
using (ICryptoTransform xform = alg.CreateDecryptor(key, iv))
{
Assert.Equal(2 * alg.BlockSize, (outputBytes.Length - outputPadding) * 8);
outputOffset += xform.TransformBlock(input, 0, input.Length, outputBytes, outputOffset);
byte[] overflow = xform.TransformFinalBlock(Array.Empty <byte>(), 0, 0);
Buffer.BlockCopy(overflow, 0, outputBytes, outputOffset, overflow.Length);
outputOffset += overflow.Length;
}
string decrypted = Encoding.ASCII.GetString(outputBytes, 0, outputOffset);
Assert.Equal(ExpectedOutput, decrypted);
}
public static void RC2DefaultCtor()
{
using (RC2 rc2 = RC2Factory.Create())
{
Assert.Equal(128, rc2.KeySize);
Assert.Equal(64, rc2.BlockSize);
Assert.Equal(CipherMode.CBC, rc2.Mode);
Assert.Equal(PaddingMode.PKCS7, rc2.Padding);
}
}
public static void RC2Blockize()
{
using (RC2 rc2 = RC2Factory.Create())
{
rc2.BlockSize = 64;
Assert.Equal(64, rc2.BlockSize);
Assert.Throws <CryptographicException>(() => rc2.BlockSize = 64 - 1);
Assert.Throws <CryptographicException>(() => rc2.BlockSize = 64 + 1);
}
}
public static void EcbRoundtrip(byte[] plaintext, byte[] ciphertext, PaddingMode padding)
{
using (RC2 rc2 = RC2Factory.Create())
{
rc2.Key = s_rc2OneShotKey;
byte[] encrypted = rc2.EncryptEcb(plaintext, padding);
byte[] decrypted = rc2.DecryptEcb(encrypted, padding);
if (padding == PaddingMode.Zeros)
{
Assert.Equal(plaintext, decrypted[..plaintext.Length]);
public static void RC2EffectiveKeySize()
{
using (RC2 rc2 = RC2Factory.Create())
{
rc2.KeySize = 40;
Assert.Equal(40, rc2.EffectiveKeySize);
rc2.EffectiveKeySize = 40;
// KeySize must equal EffectiveKeySize
rc2.KeySize = 48;
Assert.Throws <CryptographicUnexpectedOperationException>(() => rc2.EffectiveKeySize = 48 + 8);
Assert.Throws <CryptographicUnexpectedOperationException>(() => rc2.EffectiveKeySize = 48 - 8);
Assert.Throws <CryptographicUnexpectedOperationException>(() => rc2.EffectiveKeySize = 0);
}
}
public static void RC2ExplicitEncryptorDecryptor_NoIV()
{
using (RC2 alg = RC2Factory.Create())
{
alg.Padding = PaddingMode.PKCS7;
alg.Mode = CipherMode.ECB;
using (ICryptoTransform encryptor = alg.CreateEncryptor(s_randomKey_64.HexToByteArray(), null))
{
byte[] plainText1 = s_multiBlockString.HexToByteArray();
byte[] cipher1 = encryptor.Transform(plainText1);
byte[] expectedCipher1 = (
"F6DF2E83811D6CB0C8A5830069D16F6A51C985D7003852539051FABC3C6EA7CF46BD3DBD5527003A789B76CBE4D40A73" +
"620F04ED9F0AA1AEC7FEC90E7934F69E0568F6DF1F38B2198821D0A771D68A3F8220C8822E387721AEB21E183555CE07").HexToByteArray();
Assert.Equal <byte>(expectedCipher1, cipher1);
}
}
}
public static void RC2ExplicitEncryptorDecryptor_WithIV()
{
using (RC2 alg = RC2Factory.Create())
{
alg.Padding = PaddingMode.PKCS7;
alg.Mode = CipherMode.CBC;
using (ICryptoTransform encryptor = alg.CreateEncryptor(s_randomKey_64.HexToByteArray(), s_randomIv_64.HexToByteArray()))
{
byte[] plainText1 = s_multiBlockString.HexToByteArray();
byte[] cipher1 = encryptor.Transform(plainText1);
byte[] expectedCipher1 = (
"85B5D998F35ECD98DB886798170F64BA2DBA4FE902791CDE900EEB0B35728FEE35FB6CADC41DF67FBB691B45D92B876A" +
"13FD18229E5ACB797D21D7B257520910360E00FEECDE3433FDC6F15233AE6B5CAC01289AC8B57A9A6B5DA734C2E7E733").HexToByteArray();
Assert.Equal <byte>(expectedCipher1, cipher1);
}
}
}
public static void TransformWithTooShortOutputBuffer(bool encrypt, bool blockAlignedOutput)
{
using (RC2 alg = RC2Factory.Create())
using (ICryptoTransform xform = encrypt ? alg.CreateEncryptor() : alg.CreateDecryptor())
{
// 1 block, plus maybe three bytes
int outputPadding = blockAlignedOutput ? 0 : 3;
byte[] output = new byte[alg.BlockSize / 8 + outputPadding];
// 3 blocks of 0x00
byte[] input = new byte[3 * (alg.BlockSize / 8)];
Assert.Throws <ArgumentOutOfRangeException>(
() => xform.TransformBlock(input, 0, input.Length, output, 0));
Assert.Equal(new byte[output.Length], output);
}
}
public static void RC2RoundTrip(CipherMode cipherMode, PaddingMode paddingMode, string key, string iv, string textHex, string expectedDecrypted, string expectedEncrypted)
{
byte[] expectedDecryptedBytes = expectedDecrypted == null?textHex.HexToByteArray() : expectedDecrypted.HexToByteArray();
byte[] expectedEncryptedBytes = expectedEncrypted.HexToByteArray();
byte[] keyBytes = key.HexToByteArray();
using (RC2 alg = RC2Factory.Create())
{
alg.Key = keyBytes;
alg.Padding = paddingMode;
alg.Mode = cipherMode;
if (iv != null)
{
alg.IV = iv.HexToByteArray();
}
byte[] cipher = alg.Encrypt(textHex.HexToByteArray());
Assert.Equal <byte>(expectedEncryptedBytes, cipher);
byte[] decrypted = alg.Decrypt(cipher);
Assert.Equal <byte>(expectedDecryptedBytes, decrypted);
if (RC2Factory.OneShotSupported)
{
byte[] oneShotEncrypt = cipherMode switch
{
CipherMode.ECB => alg.EncryptEcb(textHex.HexToByteArray(), paddingMode),
CipherMode.CBC => alg.EncryptCbc(textHex.HexToByteArray(), iv.HexToByteArray(), paddingMode),
_ => throw new NotImplementedException(),
};
Assert.Equal(expectedEncryptedBytes, oneShotEncrypt);
byte[] oneShotDecrypt = cipherMode switch
{
CipherMode.ECB => alg.DecryptEcb(cipher, paddingMode),
CipherMode.CBC => alg.DecryptCbc(cipher, iv.HexToByteArray(), paddingMode),
_ => throw new NotImplementedException(),
};
Assert.Equal(expectedDecryptedBytes, oneShotDecrypt);
}
}
}
public static void RC2ReuseEncryptorDecryptor()
{
using (RC2 alg = RC2Factory.Create())
{
alg.Key = s_randomKey_64.HexToByteArray();
alg.IV = s_randomIv_64.HexToByteArray();
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 = s_multiBlockString.HexToByteArray();
byte[] cipher1 = encryptor.Transform(plainText1);
byte[] expectedCipher1 = (
"85B5D998F35ECD98DB886798170F64BA2DBA4FE902791CDE900EEB0B35728FEE35FB6CADC41DF67FBB691B45D92B876A" +
"13FD18229E5ACB797D21D7B257520910360E00FEECDE3433FDC6F15233AE6B5CAC01289AC8B57A9A6B5DA734C2E7E733").HexToByteArray();
Assert.Equal <byte>(expectedCipher1, cipher1);
byte[] decrypted1 = decryptor.Transform(cipher1);
byte[] expectedDecrypted1 = s_multiBlockString.HexToByteArray();
Assert.Equal <byte>(expectedDecrypted1, decrypted1);
byte[] plainText2 = s_multiBlockString_8.HexToByteArray();
byte[] cipher2 = encryptor.Transform(plainText2);
byte[] expectedCipher2 = (
"85B5D998F35ECD98DB886798170F64BA2DBA4FE902791CDE900EEB0B35728FEE35FB6CADC41DF67F6056044F15B5C7ED" +
"4FAB086053D7DC458C206145AE9655F1590C590FBDE76365FA488CADBCDA67B325A35E7CCBC1B9A15E5EBE2879C7AEC2").HexToByteArray();
Assert.Equal <byte>(expectedCipher2, cipher2);
byte[] decrypted2 = decryptor.Transform(cipher2);
byte[] expectedDecrypted2 = s_multiBlockString_8.HexToByteArray();
Assert.Equal <byte>(expectedDecrypted2, decrypted2);
}
}
}
}
public static void EncryptWithLargeOutputBuffer(bool blockAlignedOutput)
{
using (RC2 alg = RC2Factory.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 RC2RoundTrip(CipherMode cipherMode, PaddingMode paddingMode, string key, string iv, string textHex, string expectedDecrypted, string expectedEncrypted)
{
byte[] expectedDecryptedBytes = expectedDecrypted == null?textHex.HexToByteArray() : expectedDecrypted.HexToByteArray();
byte[] expectedEncryptedBytes = expectedEncrypted.HexToByteArray();
byte[] keyBytes = key.HexToByteArray();
using (RC2 alg = RC2Factory.Create())
{
alg.Key = keyBytes;
alg.Padding = paddingMode;
alg.Mode = cipherMode;
if (iv != null)
{
alg.IV = iv.HexToByteArray();
}
byte[] cipher = alg.Encrypt(textHex.HexToByteArray());
Assert.Equal <byte>(expectedEncryptedBytes, cipher);
byte[] decrypted = alg.Decrypt(cipher);
Assert.Equal <byte>(expectedDecryptedBytes, 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 (RC2 rc2 = RC2Factory.Create())
{
rc2.Mode = cipherMode;
if (feedbackSize > 0)
{
rc2.FeedbackSize = feedbackSize;
}
using (ICryptoTransform transform = rc2.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() => RC2Factory.Create();
