/// <summary>
/// Performs a measurement for the number of hashes pr second for the given algorithm and implementation
/// </summary>
/// <returns>The number of hashes pr second.</returns>
/// <param name="algorithm">The algorithm to test with.</param>
/// <param name="implementation">The implementation to test.</param>
/// <param name="blocksize">The size of the blocks being hashed.</param>
/// <param name="hashesprround">The number of hashes between each time check.</param>
/// <param name="measureseconds">The number of seconds to measure.</param>
/// <param name="bufferoffset">The number of bytes to offset the buffer for measuring non-aligned performance</param>
public static long TestHashesPrSecond(string algorithm = "SHA256", HashImplementation implementation = HashImplementation.Any, int blocksize = 102400, int hashesprround = 1000, float measureseconds = 2f, int bufferoffset = 0)
{
using (var alg = Create(algorithm, false, implementation))
{
if (alg == null)
{
return(0);
}
var st = DateTime.Now;
var target = st.Ticks + TimeSpan.FromSeconds(measureseconds).Ticks;
var buffer = new byte[blocksize + bufferoffset];
var performed = 0L;
alg.Initialize();
while (DateTime.Now.Ticks < target)
{
for (var i = 0; i < hashesprround; i++)
{
alg.TransformBlock(buffer, bufferoffset, blocksize, buffer, bufferoffset);
}
performed++;
}
alg.TransformFinalBlock(buffer, 0, 0);
var elapsed = DateTime.Now - st;
return((long)((performed * hashesprround * (blocksize / 64)) / elapsed.TotalSeconds));
}
}
/// <summary>
/// Returns a value indicating if the specific implementation is supported on this system
/// </summary>
/// <returns><c>true</c>, if implementation was supportsed, <c>false</c> otherwise.</returns>
/// <param name="implementation">The implementation to test for.</param>
public static bool SupportsImplementation(HashImplementation implementation)
{
switch (implementation)
{
case HashImplementation.OpenSSL10:
return(OpenSSL10Version != null);
case HashImplementation.OpenSSL11:
return(OpenSSL11Version != null);
case HashImplementation.AppleCommonCrypto:
return(AppleCommonCryptoHashAlgorithm.IsSupported);
case HashImplementation.CNG:
case HashImplementation.Managed:
case HashImplementation.Any:
return(true);
}
return(false);
}
public Hasher(HashImplementation hashImplementation)
{
_hashImplementation = hashImplementation;
}
/// <summary>
/// Create the specified hashing algorithm.
/// </summary>
/// <returns>The created algorithm.</returns>
/// <param name="algorithm">The name of the hash algorithm to create.</param>
/// <param name="allowfallback">If set to <c>true</c>, the `<seealso cref="System.Security.Cryptography.HashAlgorithm.Create()"/> method is called if not implementation could be loaded</param>
/// <param name="implementation">The hash implementation toy use</param>
public static HashAlgorithm Create(string algorithm, bool allowfallback = true, HashImplementation implementation = HashImplementation.Any)
{
HashAlgorithm result = null;
// If we are not asked for a particular version, pick the best we found
if (implementation == HashImplementation.Any)
{
implementation = PreferedImplementation;
}
switch (implementation)
{
case HashImplementation.OpenSSL10:
result = OpenSSL10HashAlgorithm.Create(algorithm);
break;
case HashImplementation.OpenSSL11:
result = OpenSSL11HashAlgorithm.Create(algorithm);
break;
case HashImplementation.CNG:
result = CNGHashAlgorithm.Create(algorithm, false);
break;
case HashImplementation.AppleCommonCrypto:
result = AppleCommonCryptoHashAlgorithm.Create(algorithm);
break;
case HashImplementation.Managed:
result = HashAlgorithm.Create(algorithm);
break;
}
if (allowfallback)
{
result = result ?? HashAlgorithm.Create(algorithm);
}
return(result);
}
