public static uint Verify(OmniHashcash hashcash, ReadOnlySequence <byte> sequence, ReadOnlyMemory <byte> key)
{
if (hashcash is null)
{
throw new ArgumentNullException(nameof(hashcash));
}
if (hashcash.AlgorithmType == OmniHashcashAlgorithmType.Sha2_256)
{
var target = Hmac_Sha2_256.ComputeHash(sequence, key.Span);
return(MinerHelper.Verify_Simple_Sha2_256(hashcash.Key.Span, target));
}
return(0);
}
public static async ValueTask <OmniHashcash> Create(ReadOnlySequence <byte> sequence, ReadOnlyMemory <byte> key, OmniHashcashAlgorithmType hashcashAlgorithmType, int limit, TimeSpan timeout, CancellationToken cancellationToken)
{
if (!EnumHelper.IsValid(hashcashAlgorithmType))
{
throw new ArgumentException(nameof(OmniHashcashAlgorithmType));
}
await Task.Delay(1, cancellationToken).ConfigureAwait(false);
if (hashcashAlgorithmType == OmniHashcashAlgorithmType.Sha2_256)
{
var target = Hmac_Sha2_256.ComputeHash(sequence, key.Span);
var hashcashKey = MinerHelper.Compute_Simple_Sha2_256(target, limit, timeout, cancellationToken);
return(new OmniHashcash(OmniHashcashAlgorithmType.Sha2_256, hashcashKey));
}
throw new NotSupportedException(nameof(hashcashAlgorithmType));
}