[求助帖] C#写的 RC4 加密算法和 PHP 写的 RC4 得出的结果不一样，求大佬支援

C# 代码如下：

public string EncryptRC4wq(string ckey, string str)
        {
            int[] s = new int[256];
            for (int i = 0; i < 256; i++)
            {
                s[i] = i;
            }
            //密钥转数组
            char[] keys = ckey.ToCharArray();//密钥转字符数组
            int[] key = new int[keys.Length];
            for (int i = 0; i < keys.Length; i++)
            {
                key[i] = keys[i];
            }
            //明文转数组
            char[] datas = str.ToCharArray();
            int[] mingwen = new int[datas.Length];
            for (int i = 0; i < datas.Length; i++)
            {
                mingwen[i] = datas[i];
            }

            //通过循环得到 256 位的数组(密钥)
            int j = 0;
            int key_len = key.Length;
            for (int i = 0; i < 256; i++)
            {
                j = (j + s[i] + key[i% key_len])%256;
                //swap
                int temp = s[i];
                s[i] = s[j];
                s[j] = temp;
            }
            //根据上面的 256 的密钥数组 和 明文得到密文数组
            int x = 0, y = 0, c;
            int data_len = mingwen.Length;
            int[] miwen = new int[data_len];
            string ret = "";
            for (int i = 0; i < data_len; i++)
            {
                x = (x + 1) % 256;
                y = (y + s[x]) % 256;

                //swap
                int temp = s[x];
                s[x] = s[y];
                s[y] = temp;

                c = s[x]+s[y];
                c = c % 256;
                miwen[i] = mingwen[i] ^ s[c];
                ret +=(char)miwen[i];
            }
           
            return  ret;
        }

PHP 代码如下

// RC4 加密方法
	// $key 为 加密密匙
	// $pt 为 加密字符串
	// 加密内容再次加密则为解密
	public function RC4($key, $pt){
		$s = array();    
		for ($i=0; $i<256; $i++) {
			$s[$i] = $i;    
		}
		$j = 0;
		$key_len = strlen($key);
		for ($i=0; $i<256; $i++) {
			$j = ($j + $s[$i] + ord($key[$i % $key_len])) % 256;
			//swap
			$x = $s[$i];
			$s[$i] = $s[$j];
			$s[$j] = $x;
		}
		$i = 0;
		$j = 0;
		$ct = '';
		$data_len = strlen($pt);
		for ($y=0; $y< $data_len; $y++) {
			$i = ($i + 1) % 256;
			$j = ($j + $s[$i]) % 256;
			//swap
			$x = $s[$i];
			$s[$i] = $s[$j];
			$s[$j] = $x;
			$ct .= $pt[$y] ^ chr($s[($s[$i] + $s[$j]) % 256]);
		}
		return $ct;
	}

loqixh

2019-10-18 16:52:20 +08:00

public static void Encrypt(byte[] key, byte[] data, int startIndex, int count)
{
int i, j, n, t;
byte c;
byte[] s = new byte[256]; //S-box
byte[] k = new byte[256];

for (i = 0; i < 256; i++)
{
s[i] = (byte)i;
}

//把 key 循环放进 K
j = 0;
for (i = 0; i < 256; i++)
{
k[i] = key[j % key.Length];
j++;
}

j = 0;
for (i = 0; i < 256; i++)
{
j = (j + s[i] + k[i]) % 256;
c = s[i];
s[i] = s[j];
s[j] = c;
}

i = 0;
j = 0;
for (n = startIndex; n < startIndex + count; n++)
{
i = (i + 1) % 256;
j = (j + s[i]) % 256;

//交换 S[i]和 S[j]
c = s[i];
s[i] = s[j];
s[j] = c;

t = (int)((s[i] + s[j]) % 256);
c = s[t];
data[n] = (byte)(data[n] ^ c); //异或加密

}