public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
{
// inputCount <= InputBlockSize is allowed
ThrowHelper.ValidateTransformBlock(inputBuffer, inputOffset, inputCount);
// Convert.ToBase64CharArray already does padding, so all we have to check is that
// the inputCount wasn't 0
if (inputCount == 0)
{
return(Array.Empty <byte>());
}
else if (inputCount > InputBlockSize)
{
ThrowHelper.ThrowArgumentOutOfRange(ThrowHelper.ExceptionArgument.inputCount);
}
// Again, for now only a block at a time
Span <byte> input = inputBuffer.AsSpan(inputOffset, inputCount);
byte[] output = new byte[OutputBlockSize];
OperationStatus status = Base64.EncodeToUtf8(input, output, out int consumed, out int written, isFinalBlock: true);
if (written != OutputBlockSize)
{
ThrowHelper.ThrowCryptographicException();
}
Debug.Assert(status == OperationStatus.Done);
Debug.Assert(consumed == inputCount);
return(output);
}
public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
// inputCount < InputBlockSize is not allowed
ThrowHelper.ValidateTransformBlock(inputBuffer, inputOffset, inputCount, InputBlockSize);
if (outputBuffer == null)
{
ThrowHelper.ThrowArgumentNull(ThrowHelper.ExceptionArgument.outputBuffer);
}
// For now, only convert 3 bytes to 4
Span <byte> input = inputBuffer.AsSpan(inputOffset, InputBlockSize);
Span <byte> output = outputBuffer.AsSpan(outputOffset, OutputBlockSize);
OperationStatus status = Base64.EncodeToUtf8(input, output, out int consumed, out int written, isFinalBlock: false);
if (written != OutputBlockSize)
{
ThrowHelper.ThrowCryptographicException();
}
Debug.Assert(status == OperationStatus.NeedMoreData);
Debug.Assert(consumed == InputBlockSize);
return(written);
}
