解决PHP中sm4加密算法与JAVA中sm4加密后的值不一致的问题

重点：在PHP中，需要使7及以上版本才行

两种方式如下：

第一种：使用系统自带方法做sm4加密，代码如下：

// 使用PHP系统方法，对字符串做sm4加密处理
// 要加密的明文
$plaintext = 'QCzqMc5n';

// 双方约定好的密钥，转换16进制的密钥为二进制格式后，参与加密
$key = hex2bin('这里是十六进制的字符串');

$ciphertext = openssl_encrypt($plaintext, 'sm4-ecb', $key, OPENSSL_RAW_DATA);

// 加密后的字符串，一定要将二进制的转成十六进制的，才与java加密后的一制
$str = bin2hex($ciphertext);

echo $str;
exit;

第二种：使用自定义类做sm4加密

sM4KeySchedule($key);

        $bytes = $this->pad($data, $this->_block_size);

        $chunks = array_chunk($bytes, $this->_block_size);

        $ciphertext = "";

        foreach ($chunks as $chunk) {

            $ciphertext .= $this->sM4Encrypt($chunk);

        }
        return base64_encode($ciphertext);

    }

    public function decrypt($key, $data)
    {

        $data = base64_decode($data);

        if (strlen($data) _block_size != 0) {

            return false;

        }

        $this->sM4KeySchedule($key);

        $bytes = unpack("C*", $data);

        $chunks = array_chunk($bytes, $this->_block_size);

        $plaintext = "";

        foreach ($chunks as $chunk) {

            $plaintext .= substr($this->sM4Decrypt($chunk), 0, 16);

        }

        $plaintext = $this->un_pad($plaintext);

        return $plaintext;

    }

    private function sM4Decrypt($cipherText)
    {

        $x = [];

        for ($j = 0; $j < 4; $j++) {

            $x[$j] = ($cipherText[$j * 4] << 24) | ($cipherText[$j * 4 + 1] << 16) | ($cipherText[$j * 4 + 2] << 8) | ($cipherText[$j * 4 + 3]);

        }

        for ($i = 0; $i _rk[31 - $i];

            $buf = (self::SM4_SBOX[($tmp >> 24) & 0xFF]) <> 16) & 0xFF]) <> 8) & 0xFF]) <sm4Rotl32(($buf), 2) ^ $this->sm4Rotl32(($buf), 10) ^ $this->sm4Rotl32(($buf), 18) ^ $this->sm4Rotl32(($buf), 24));

        }

        $plainText = [];

        for ($k = 0; $k > 24) & 0xFF;

            $plainText[4 * $k + 1] = ($x[35 - $k] >> 16) & 0xFF;

            $plainText[4 * $k + 2] = ($x[35 - $k] >> 8) & 0xFF;

            $plainText[4 * $k + 3] = ($x[35 - $k]) & 0xFF;

        }

        return $this->bytesToString($plainText);

    }

    private function sM4Encrypt($plainText)
    {

        $x = [];

        for ($j = 0; $j < 4; $j++) {

            $x[$j] = ($plainText[$j * 4] << 24) | ($plainText[$j * 4 + 1] << 16) | ($plainText[$j * 4 + 2] << 8) | ($plainText[$j * 4 + 3]);

        }

        for ($i = 0; $i _rk[$i];

            $buf = (self::SM4_SBOX[($tmp >> 24) & 0xFF]) <> 16) & 0xFF]) <> 8) & 0xFF]) <sm4Rotl32(($buf), 2) ^ $this->sm4Rotl32(($buf), 10) ^ $this->sm4Rotl32(($buf), 18) ^ $this->sm4Rotl32(($buf), 24));

        }

        $cipherText = [];

        for ($k = 0; $k > 24) & 0xFF;

            $cipherText[4 * $k + 1] = ($x[35 - $k] >> 16) & 0xFF;

            $cipherText[4 * $k + 2] = ($x[35 - $k] >> 8) & 0xFF;

            $cipherText[4 * $k + 3] = ($x[35 - $k]) & 0xFF;

        }

        return $this->bytesToString($cipherText);

    }

    private function stringToBytes($string)
    {

        return unpack('C*', $string);

    }

    private function bytesToString($bytes)
    {

        return vsprintf(str_repeat('%c', count($bytes)), $bytes);

    }

    private function pad($data)
    {

        $bytes = $this->stringToBytes($data);

        $rem = $this->_block_size - count($bytes) % $this->_block_size;

        for ($i = 0; $i stringToBytes($data);

        $rem = isset($bytes[count($bytes)]) ? $bytes[count($bytes)] : '';

        $bytes = array_slice($bytes, 0, count($bytes) - $rem);

        return $this->bytesToString($bytes);

    }

    private function sm4Rotl32($buf, $n)
    {

        return (($buf <> (32 - $n));

    }

    private function sM4KeySchedule($key)
    {

        $this->_rk = [];

        $key = array_values(unpack("C*", $key));

        $k = [];

        for ($i = 0; $i < 4; $i++) {
			$a = isset($key[4 * $i]) ? $key[4 * $i] : '';
			$b = isset($key[4 * $i + 1]) ? $key[4 * $i + 1] : '';
			$c = isset($key[4 * $i + 2]) ? $key[4 * $i + 2] : '';
			$d = isset($key[4 * $i + 3]) ? $key[4 * $i + 3] : '';
            $k[$i] = self::SM4_FK[$i] ^ (($a << 24) | ($b << 16) | ($c << 8) | $d);
        }

        for ($j = 0; $j > 24) & 0xFF]) <> 16) & 0xFF]) <> 8) & 0xFF]) <sm4Rotl32(($buf), 13)) ^ ($this->sm4Rotl32(($buf), 23)));

            $this->_rk[$j] = $k[$j + 4];

        }

    }

}

// 参与加密的密钥，最终为二进制的
$key = hex2bin('这里是双方约定好的十六进制的密钥');
// 需要加密的明文
$data = 'QCzqMc5n';

$sm4 = new SM4();
echo "加密key：" . $key . "
";
echo "明文：" . $data . "
";
 
$a = $sm4->encrypt($key, $data);
// 得到的结果得先反转义base64编码，得到二进制，再转十六进制，才会与java的sm4加密后一制
echo "加密结果：" . bin2hex(base64_decode($a)) . "
";
 
$b = $sm4->decrypt($key, $a);
echo "解密结果：" . $b . "
";
?>