private byte[]? ChangeKeyImpl(ReadOnlySpan <byte> key)
{
byte[]? modifiedKey = null;
// If _blockSize is -1 the key isn't going to be extractable by the object holder,
// so there's no point in recalculating it in managed code.
if (key.Length > _blockSize && _blockSize > 0)
{
// Perform RFC 2104, section 2 key adjustment.
if (_lazyHashProvider == null)
{
_lazyHashProvider = HashProviderDispenser.CreateHashProvider(_hashAlgorithmId);
}
_lazyHashProvider.AppendHashData(key);
modifiedKey = _lazyHashProvider.FinalizeHashAndReset();
}
HashProvider?oldHashProvider = _hMacProvider;
_hMacProvider = null !;
oldHashProvider?.Dispose(true);
_hMacProvider = HashProviderDispenser.CreateMacProvider(_hashAlgorithmId, key);
return(modifiedKey);
}
public void ChangeKey(byte[] key)
{
// If _blockSize is -1 the key isn't going to be extractable by the object holder,
// so there's no point in recalculating it in managed code.
if (key.Length > _blockSize && _blockSize > 0)
{
// Perform RFC 2104, section 2 key adjustment.
if (_lazyHashProvider == null)
{
_lazyHashProvider = HashProviderDispenser.CreateHashProvider(_hashAlgorithmId);
}
_lazyHashProvider.AppendHashData(key, 0, key.Length);
key = _lazyHashProvider.FinalizeHashAndReset();
}
HashProvider oldHashProvider = _hMacProvider;
_hMacProvider = null;
if (oldHashProvider != null)
{
oldHashProvider.Dispose(true);
}
_hMacProvider = HashProviderDispenser.CreateMacProvider(_hashAlgorithmId, key);
ActualKey = key;
}
public static int HashData(string hashAlgorithmId, ReadOnlySpan <byte> source, Span <byte> destination)
{
HashProvider provider = HashProviderDispenser.CreateHashProvider(hashAlgorithmId);
provider.AppendHashData(source);
return(provider.FinalizeHashAndReset(destination));
}