UncheckedTransformFinalBlock() [6/6]

unsafe override int Internal.Cryptography.UniversalCryptoDecryptor.UncheckedTransformFinalBlock ( ReadOnlySpan< byte > inputBuffer, Span< byte > outputBuffer )

inlineprotected

Definition at line 59 of file UniversalCryptoDecryptor.cs.

    {
        if (inputBuffer.Length % base.PaddingSizeBytes != 0)
        {
            throw new CryptographicException(System.SR.Cryptography_PartialBlock);
        }
        byte[] array = null;
        int num = 0;
        try
        {
            Span<byte> span;
            ReadOnlySpan<byte> input;
            if (_heldoverCipher == null)
            {
                num = inputBuffer.Length;
                array = System.Security.Cryptography.CryptoPool.Rent(inputBuffer.Length);
                span = array.AsSpan(0, inputBuffer.Length);
                input = inputBuffer;
            }
            else
            {
                num = _heldoverCipher.Length + inputBuffer.Length;
                array = System.Security.Cryptography.CryptoPool.Rent(num);
                span = array.AsSpan(0, num);
                _heldoverCipher.AsSpan().CopyTo(span);
                inputBuffer.CopyTo(span.Slice(_heldoverCipher.Length));
                input = span;
            }
            int num2 = 0;
            fixed (byte* ptr = span)
            {
                Span<byte> span2 = span[..base.BasicSymmetricCipher.TransformFinal(input, span)];
                if (span2.Length > 0)
                {
                    num2 = GetPaddingLength(span2);
                    span2.Slice(0, num2).CopyTo(outputBuffer);
                }
            }
            Reset();
            return num2;
        }
        finally
        {
            if (array != null)
            {
                System.Security.Cryptography.CryptoPool.Return(array, num);
            }
        }
    }

References Internal.Cryptography.UniversalCryptoDecryptor._heldoverCipher, System.array, System.ReadOnlySpan< T >.CopyTo(), System.SR.Cryptography_PartialBlock, Internal.Cryptography.UniversalCryptoDecryptor.GetPaddingLength(), System.input, System.ReadOnlySpan< T >.Length, System.Span< T >.Length, System.Security.Cryptography.CryptoPool.Rent(), Internal.Cryptography.UniversalCryptoDecryptor.Reset(), System.Security.Cryptography.CryptoPool.Return(), and System.Span< T >.Slice().