public void TestVector(BlockHashAlgorithm hasher, byte[] key, byte[] input, byte[] expectedOutput)
{
Hmac hmac = new Hmac(hasher, key);
byte[] result = hmac.ComputeHash(input);
CustomAssert.AreEqual(
expectedOutput,
result,
string.Format("{0}({1}) on {2} should have produced {3} but instead got {4}", hmac, Conversions.ByteToHexadecimal(key), Conversions.ByteToHexadecimal(input), Conversions.ByteToHexadecimal(expectedOutput), Conversions.ByteToHexadecimal(result))
);
}
/// <summary>Initializes a new instance of the HMAC class.</summary>
/// <param name="hashAlgorithm">The base hash algorithm to use.</param>
/// <param name="key">The key to use for the HMAC.</param>
/// <exception cref="ArgumentNullException">When the specified HashAlgorithm is null.</exception>
/// <remarks>If the specified key is null, a random key will be generated and used.</remarks>
public Hmac(BlockHashAlgorithm hashAlgorithm, byte[] key)
{
lock (syncLock) {
if (hashAlgorithm == null)
{
throw new ArgumentNullException("hashAlgorithm", Properties.Resources.hashCantBeNull);
}
this.hashAlgorithm = hashAlgorithm;
if (key == null)
{
Random r = new Random((int)System.DateTime.Now.Ticks);
byte[] temp = new byte[HashAlgorithm.BlockSize];
r.NextBytes(temp);
InitializeKey(temp);
}
else
{
InitializeKey(key);
}
}
}
public void HashSizeTest(BlockHashAlgorithm hasher)
{
Hmac hmac = new Hmac(hasher);
Assert.AreEqual(hasher.HashSize, hmac.HashSize);
}
/// <summary>Initializes a new instance of the HMAC class.</summary>
/// <param name="hashAlgorithm">The base hash algorithm to use.</param>
/// <remarks>A random key will be generated.</remarks>
public Hmac(BlockHashAlgorithm hashAlgorithm) : this(hashAlgorithm, null)
{
}
