/* =================================================================================================================
* Twofish and Threefish are out-of-scope for MVP-01.
* =================================================================================================================
* [TestMethod]
* public void Encrypt_ShouldReproduceTestVector_ForTwofish128Ecb()
* {
* // Arrange.
* var algorithm = SymmetricAlgorithmSpecification.Twofish128Ecb;
* var blockLengthInBits = 128;
* var cipherMode = CipherMode.ECB;
* var key = new Byte[] { 0x9f, 0x58, 0x9f, 0x5c, 0xf6, 0x12, 0x2c, 0x32, 0xb6, 0xbf, 0xec, 0x2f, 0x2a, 0xe8, 0xc3, 0x5a };
* var initializationVector = (Byte[])null;
* var plaintext = new Byte[] { 0xd4, 0x91, 0xdB, 0x16, 0xe7, 0xb1, 0xc3, 0x9e, 0x86, 0xcb, 0x08, 0x6b, 0x78, 0x9f, 0x54, 0x19 };
* var ciphertext = new Byte[] { 0x01, 0x9f, 0x98, 0x09, 0xde, 0x17, 0x11, 0x85, 0x8f, 0xaa, 0xc3, 0xa3, 0xba, 0x20, 0xfb, 0xc3 };
*
* // Assert.
* Encrypt_ShouldReproduceTestVector(algorithm, blockLengthInBits, cipherMode, key, initializationVector, plaintext, ciphertext);
* }*/
private static void Encrypt_ShouldReproduceTestVector(SymmetricAlgorithmSpecification algorithm, Int32 blockLengthInBits, CipherMode cipherMode, Byte[] key, Byte[] initializationVector, Byte[] plaintext, Byte[] ciphertext)
{
using (var randomnessProvider = RandomNumberGenerator.Create())
{
using (var secureKey = new SecureBuffer(key.Length))
{
// Arrange.
var blockLengthInBytes = (blockLengthInBits / 8);
var target = new SymmetricBinaryProcessor(randomnessProvider);
secureKey.Access(keyBuffer =>
{
Array.Copy(key, keyBuffer, key.Length);
});
// Act.
var encryptResult = target.Encrypt(plaintext, secureKey, algorithm, initializationVector);
// Assert.
encryptResult.Should().NotBeNullOrEmpty();
// Arrange.
var processedEncryptResult = cipherMode == CipherMode.CBC ? encryptResult.Skip(blockLengthInBytes).Take(ciphertext.Length).ToArray() : encryptResult.Take(ciphertext.Length).ToArray();
// Assert.
processedEncryptResult.Length.Should().Be(ciphertext.Length);
for (var i = 0; i < ciphertext.Length; i++)
{
// Assert.
processedEncryptResult[i].Should().Be(ciphertext[i]);
}
}
}
}
public void FunctionalLifeSpanTest_ShouldProduceDesiredResults()
{
// Arrange.
var length = 17;
var bufferReference = (Byte[])null;
var bufferSubsegment = new Byte[3];
using (var target = new SecureBuffer(length))
{
// Act.
target.Access(buffer =>
{
// Assert.
buffer.Length.Should().Be(length);
buffer.Should().OnlyContain(value => value == 0x00);
for (var i = 0; i < length; i++)
{
buffer[i] = (Byte)i;
}
// Arrange.
bufferReference = buffer;
Array.Copy(buffer, 1, bufferSubsegment, 0, 3);
});
// Act.
target.Access(buffer =>
{
// Assert.
buffer.Length.Should().Be(length);
buffer[0].Should().Be(0x00);
buffer[4].Should().Be(0x04);
buffer[8].Should().Be(0x08);
});
}
// Assert.
bufferReference.Length.Should().Be(length);
bufferReference.Should().OnlyContain(value => value == 0x00);
bufferSubsegment[0].Should().Be(0x01);
bufferSubsegment[1].Should().Be(0x02);
bufferSubsegment[2].Should().Be(0x03);
}
/// <summary>
/// Converts the value of the current <see cref="CascadingSymmetricKey" /> to its equivalent binary representation.
/// </summary>
/// <returns>
/// A binary representation of the current <see cref="CascadingSymmetricKey" />.
/// </returns>
public SecureBuffer ToBuffer()
{
var result = new SecureBuffer(SerializedLength);
try
{
using (var controlToken = StateControl.Enter())
{
result.Access(pinnedResultBuffer =>
{
var keyLength = SecureSymmetricKey.SerializedLength;
for (var i = 0; i < MaximumDepth; i++)
{
if (i < Depth)
{
using (var keyBuffer = Keys[i].ToBuffer())
{
keyBuffer.Access(pinnedKeyBuffer =>
{
// Copy the key buffers out to the result buffer.
Array.Copy(pinnedKeyBuffer, 0, pinnedResultBuffer, (keyLength * i), keyLength);
});
}
continue;
}
// Fill the unused segments with random bytes.
var randomBytes = new Byte[keyLength];
HardenedRandomNumberGenerator.Instance.GetBytes(randomBytes);
Array.Copy(randomBytes, 0, pinnedResultBuffer, (keyLength * i), keyLength);
}
// Append the depth as a 16-bit integer.
Buffer.BlockCopy(BitConverter.GetBytes(Convert.ToUInt16(Depth)), 0, pinnedResultBuffer, (SerializedLength - sizeof(UInt16)), sizeof(UInt16));
});
return(result);
}
}
catch
{
result.Dispose();
throw new SecurityException("Key serialization failed.");
}
}
/// <summary>
/// Encrypts the specified plaintext object.
/// </summary>
/// <param name="plaintextObject">
/// The plaintext object to encrypt.
/// </param>
/// <param name="key">
/// The key derivation bits used to transform the object.
/// </param>
/// <param name="algorithm">
/// The algorithm specification used to transform the object.
/// </param>
/// <param name="initializationVector">
/// An initialization vector with length greater than or equal to the block size for the specified cipher (extra bytes are
/// ignored), or <see langword="null" /> to generate a random initialization vector.
/// </param>
/// <returns>
/// The resulting ciphertext.
/// </returns>
/// <exception cref="SecurityException">
/// An exception was raised during encryption or serialization.
/// </exception>
public Byte[] Encrypt(T plaintextObject, SecureBuffer key, SymmetricAlgorithmSpecification algorithm, Byte[] initializationVector)
{
try
{
var ciphertext = (Byte[])null;
key.Access(keyBuffer =>
{
ciphertext = Encrypt(plaintextObject, keyBuffer, algorithm, initializationVector);
});
return(ciphertext);
}
catch
{
throw new SecurityException("The encryption operation failed.");
}
}
/// <summary>
/// Decrypts the specified ciphertext.
/// </summary>
/// <param name="ciphertext">
/// The ciphertext to decrypt.
/// </param>
/// <param name="key">
/// The key derivation bits used to transform the ciphertext.
/// </param>
/// <param name="algorithm">
/// The algorithm specification used to transform the ciphertext.
/// </param>
/// <returns>
/// The resulting plaintext object.
/// </returns>
/// <exception cref="SecurityException">
/// An exception was raised during decryption or deserialization.
/// </exception>
public T Decrypt(Byte[] ciphertext, SecureBuffer key, SymmetricAlgorithmSpecification algorithm)
{
try
{
var plaintext = default(T);
key.Access(keyBuffer =>
{
plaintext = Decrypt(ciphertext, keyBuffer, algorithm);
});
return(plaintext);
}
catch
{
throw new SecurityException("The decryption operation failed.");
}
}
private SecureSymmetricKey(SymmetricAlgorithmSpecification algorithm, SecureSymmetricKeyDerivationMode derivationMode, PinnedBuffer keySource)
: base(ConcurrencyControlMode.SingleThreadLock)
{
Algorithm = algorithm.RejectIf().IsEqualToValue(SymmetricAlgorithmSpecification.Unspecified, nameof(algorithm));
DerivationMode = derivationMode.RejectIf().IsEqualToValue(SecureSymmetricKeyDerivationMode.Unspecified, nameof(derivationMode));
KeySource = new SecureBuffer(KeySourceLengthInBytes);
LazyPbkdf2Provider = new Lazy <Rfc2898DeriveBytes>(InitializePbkdf2Algorithm, LazyThreadSafetyMode.ExecutionAndPublication);
// Gather information about the derived key.
var keyBitLength = algorithm.ToKeyBitLength();
DerivedKeyLength = (keyBitLength / 8);
BlockWordCount = (keyBitLength / 32);
BlockCount = (KeySourceWordCount / BlockWordCount);
// Copy in the key source bits.
KeySource.Access(buffer => Array.Copy(keySource, buffer, buffer.Length));
}
/// <summary>
/// Converts the value of the current <see cref="SecureSymmetricKey" /> to its equivalent binary representation.
/// </summary>
/// <returns>
/// A binary representation of the current <see cref="SecureSymmetricKey" />.
/// </returns>
public SecureBuffer ToBuffer()
{
var resultBuffer = new SecureBuffer(SerializedLength);
try
{
using (var controlToken = StateControl.Enter())
{
using (var plaintextBuffer = new PinnedBuffer(SerializedPlaintextLength, true))
{
KeySource.Access(pinnedKeySourceBuffer =>
{
Array.Copy(pinnedKeySourceBuffer, 0, plaintextBuffer, KeySourceBufferIndex, KeySourceLengthInBytes);
});
plaintextBuffer[AlgorithmBufferIndex] = (Byte)Algorithm;
plaintextBuffer[DerivationModeBufferIndex] = (Byte)DerivationMode;
using (var cipher = BufferEncryptionAlgorithm.ToCipher(RandomnessProvider))
{
using (var initializationVector = new PinnedBuffer(cipher.BlockSizeInBytes, true))
{
RandomnessProvider.GetBytes(initializationVector);
resultBuffer.Access(pinnedResultBuffer =>
{
using (var ciphertext = cipher.Encrypt(plaintextBuffer, BufferEncryptionKey, initializationVector))
{
Array.Copy(ciphertext, 0, pinnedResultBuffer, 0, SerializedLength);
}
});
}
}
}
}
return(resultBuffer);
}
catch
{
resultBuffer.Dispose();
throw new SecurityException("Key serialization failed.");
}
}
/// <summary>
/// Creates a new instance of a <see cref="CascadingSymmetricKey" /> using the specified buffer.
/// </summary>
/// <param name="buffer">
/// A binary representation of a <see cref="CascadingSymmetricKey" />.
/// </param>
/// <returns>
/// A new instance of a <see cref="CascadingSymmetricKey" />.
/// </returns>
/// <exception cref="ArgumentException">
/// <paramref name="buffer" /> is invalid.
/// </exception>
/// <exception cref="ArgumentNullException">
/// <paramref name="buffer" /> is <see langword="null" />.
/// </exception>
public static CascadingSymmetricKey FromBuffer(SecureBuffer buffer)
{
buffer.RejectIf().IsNull(nameof(buffer)).OrIf(argument => argument.Length != SerializedLength, nameof(buffer), "The specified buffer is invalid.");
try
{
var keys = (SecureSymmetricKey[])null;
buffer.Access(pinnedBuffer =>
{
// Interrogate the final 16 bits to determine the depth.
var keyLength = SecureSymmetricKey.SerializedLength;
var depth = BitConverter.ToUInt16(pinnedBuffer, (SerializedLength - sizeof(UInt16)));
keys = new SecureSymmetricKey[depth];
for (var i = 0; i < depth; i++)
{
using (var secureBuffer = new SecureBuffer(keyLength))
{
secureBuffer.Access(keyBuffer =>
{
// Copy out the key buffers.
Array.Copy(pinnedBuffer, (keyLength * i), keyBuffer, 0, keyLength);
});
keys[i] = SecureSymmetricKey.FromBuffer(secureBuffer);
}
}
});
return(new CascadingSymmetricKey(keys));
}
catch
{
throw new ArgumentException("The specified buffer is invalid.", nameof(buffer));
}
}
/// <summary>
/// Creates a new instance of a <see cref="SecureSymmetricKey" /> using the specified buffer.
/// </summary>
/// <param name="buffer">
/// A binary representation of a <see cref="SecureSymmetricKey" />.
/// </param>
/// <returns>
/// A new instance of a <see cref="SecureSymmetricKey" />.
/// </returns>
/// <exception cref="ArgumentException">
/// <paramref name="buffer" /> is invalid.
/// </exception>
/// <exception cref="ArgumentNullException">
/// <paramref name="buffer" /> is <see langword="null" />.
/// </exception>
public static SecureSymmetricKey FromBuffer(SecureBuffer buffer)
{
buffer.RejectIf().IsNull(nameof(buffer)).OrIf(argument => argument.Length != SerializedLength, nameof(buffer), "The specified buffer is invalid.");
try
{
var result = (SecureSymmetricKey)null;
buffer.Access(pinnedCiphertext =>
{
using (var plaintextBuffer = new PinnedBuffer(SerializedPlaintextLength, true))
{
using (var cipher = BufferEncryptionAlgorithm.ToCipher(RandomnessProvider))
{
using (var plaintext = cipher.Decrypt(pinnedCiphertext, BufferEncryptionKey))
{
Array.Copy(plaintext, 0, plaintextBuffer, 0, SerializedPlaintextLength);
}
}
using (var keySource = new PinnedBuffer(KeySourceLengthInBytes, true))
{
Array.Copy(plaintextBuffer, KeySourceBufferIndex, keySource, 0, KeySourceLengthInBytes);
var algorithm = (SymmetricAlgorithmSpecification)plaintextBuffer[AlgorithmBufferIndex];
var derivationMode = (SecureSymmetricKeyDerivationMode)plaintextBuffer[DerivationModeBufferIndex];
result = new SecureSymmetricKey(algorithm, derivationMode, keySource);
}
}
});
return(result);
}
catch
{
throw new ArgumentException("The specified buffer is invalid.", nameof(buffer));
}
}