填充字节[]到16字节倍数用于AES加密-Padbyte[]to16-bytemultipleforAESEncryption

I currently have a function [C#] which takes a byte[] and an alignment to set it to, but during encryption, an error is thrown every once in awhile.

我目前有一个函数[C#],它接受一个byte []和一个对齐来设置它,但在加密过程中,每隔一段时间就抛出一个错误。

    private byte[] AlignByteArray(byte[] content, int alignto)
    {
        long thelength = content.Length - 1;
        long remainder = 1;

        while (remainder != 0)
        {
            thelength += 1;
            remainder = thelength % alignto;
        }
        Array.Resize(ref content, (int)thelength);
        return content;
    }

Does anyone see any issues with the function? I'm getting errors that the content size is not valid during AES encryption, suggesting that it is not padding right.

有没有人看到该功能有任何问题?我收到的错误是AES加密期间内容大小无效,表明它没有正确填充。

2 个解决方案

private static void PadToMultipleOf(ref byte[] src, int pad)
{
    int len = (src.Length + pad - 1) / pad * pad;
    Array.Resize(ref src, len);
}

int length = 16 * ((content.Length + 15) / 16);
Array.Resize(ref content, length);

int length = alignment * ((content.Length + alignment - 1) / alignment);
Array.Resize(ref content, length);