/// <summary>
/// Returns the upper and lower base hash values from which the k hashes are
/// derived using the given hash bytes directly. The result will be the
/// same regardless of the endianness of the architecture. Used by a unit
/// test to confirm the calculation is compatible with the HashKernel from
/// https://github.com/tylertreat/BoomFilters running in Go.
/// </summary>
/// <param name="hashBytes">The hash bytes.</param>
/// <returns>A HashKernel</returns>
public static HashKernelReturnValue HashKernelFromHashBytes(byte[] hashBytes)
{
return(HashKernelReturnValue.Create(
HashBytesToUInt32(hashBytes, 0),
HashBytesToUInt32(hashBytes, 4)
));
}
/// <summary>
/// Returns the upper and lower base hash values from which the k hashes are
/// derived.
/// </summary>
/// <param name="data">The data bytes to hash.</param>
/// <param name="algorithm">The hashing algorithm to use.</param>
/// <returns>A HashKernel</returns>
public static HashKernelReturnValue HashKernel(byte[] data, HashAlgorithm algorithm)
{
var hash = new Hash(algorithm);
hash.ComputeHash(data);
var sum = hash.Sum();
return(HashKernelReturnValue.Create(
ToBigEndianUInt32(sum.Skip(4).Take(4).ToArray()),
ToBigEndianUInt32(sum.Take(4).ToArray())
));
}
