public void Ctor_Buffer_Success()
{
// Arrange
var input = new byte[] { 0x20, 0x30, 0x40 };
// Act
var secret = new Secret(input);
input[1] = 0xFF; // mutate original array - secret shouldn't be modified
// Assert - length
Assert.Equal(3, secret.Length);
// Assert - managed buffer
var outputSegment = new ArraySegment<byte>(new byte[7], 2, 3);
secret.WriteSecretIntoBuffer(outputSegment);
Assert.Equal(new byte[] { 0x20, 0x30, 0x40 }, outputSegment.AsStandaloneArray());
// Assert - unmanaged buffer
var outputBuffer = new byte[3];
fixed (byte* pOutputBuffer = outputBuffer)
{
secret.WriteSecretIntoBuffer(pOutputBuffer, 3);
}
Assert.Equal(new byte[] { 0x20, 0x30, 0x40 }, outputBuffer);
}
public void Ctor_Buffer_Success()
{
// Arrange
var input = new byte[] { 0x20, 0x30, 0x40 };
// Act
var secret = new Secret(input);
input[1] = 0xFF; // mutate original array - secret shouldn't be modified
// Assert - length
Assert.Equal(3, secret.Length);
// Assert - managed buffer
var outputSegment = new ArraySegment <byte>(new byte[7], 2, 3);
secret.WriteSecretIntoBuffer(outputSegment);
Assert.Equal(new byte[] { 0x20, 0x30, 0x40 }, outputSegment.AsStandaloneArray());
// Assert - unmanaged buffer
var outputBuffer = new byte[3];
fixed(byte *pOutputBuffer = outputBuffer)
{
secret.WriteSecretIntoBuffer(pOutputBuffer, 3);
}
Assert.Equal(new byte[] { 0x20, 0x30, 0x40 }, outputBuffer);
}
private static void TestManagedKeyDerivation(byte[] kdk, byte[] label, byte[] contextHeader, byte[] context, int numDerivedBytes, string expectedDerivedSubkeyAsBase64)
{
var labelSegment = new ArraySegment <byte>(new byte[label.Length + 10], 3, label.Length);
Buffer.BlockCopy(label, 0, labelSegment.Array, labelSegment.Offset, labelSegment.Count);
var contextSegment = new ArraySegment <byte>(new byte[context.Length + 10], 5, context.Length);
Buffer.BlockCopy(context, 0, contextSegment.Array, contextSegment.Offset, contextSegment.Count);
var derivedSubkeySegment = new ArraySegment <byte>(new byte[numDerivedBytes + 10], 4, numDerivedBytes);
ManagedSP800_108_CTR_HMACSHA512.DeriveKeysWithContextHeader(kdk, labelSegment, contextHeader, contextSegment,
bytes => new HMACSHA512(bytes), derivedSubkeySegment);
Assert.Equal(expectedDerivedSubkeyAsBase64, Convert.ToBase64String(derivedSubkeySegment.AsStandaloneArray()));
}
private static void TestManagedKeyDerivation(byte[] kdk, byte[] label, byte[] contextHeader, byte[] context, int numDerivedBytes, string expectedDerivedSubkeyAsBase64)
{
var labelSegment = new ArraySegment<byte>(new byte[label.Length + 10], 3, label.Length);
Buffer.BlockCopy(label, 0, labelSegment.Array, labelSegment.Offset, labelSegment.Count);
var contextSegment = new ArraySegment<byte>(new byte[context.Length + 10], 5, context.Length);
Buffer.BlockCopy(context, 0, contextSegment.Array, contextSegment.Offset, contextSegment.Count);
var derivedSubkeySegment = new ArraySegment<byte>(new byte[numDerivedBytes + 10], 4, numDerivedBytes);
ManagedSP800_108_CTR_HMACSHA512.DeriveKeysWithContextHeader(kdk, labelSegment, contextHeader, contextSegment,
bytes => new HMACSHA512(bytes), derivedSubkeySegment);
Assert.Equal(expectedDerivedSubkeyAsBase64, Convert.ToBase64String(derivedSubkeySegment.AsStandaloneArray()));
}
