PHP SM4加密的实现

蔷薇雨 發表於 2026-5-3 17:27:25

<p>sm4基类</p>
<div class="jb51code"><pre class="brush:php;">class Sm4
{
private $ck = [
   0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
   0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
   0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
   0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
   0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
   0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
   0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
   0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
];

private $Sbox = [
   0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
   0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
   0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
   0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
   0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
   0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
   0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
   0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
   0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
   0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
   0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
   0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
   0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
   0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
   0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
   0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
];

private $fk = ;

private $rk = [];

private $b = '';

private $len = 16;

/**
* Sm4 constructor.
* @param string $key 秘钥长度16位
* @param string $b 不是16的倍数需要的补码
* @throws \Exception
*/
public function __construct($key, $b = ' ')
{
   $this->ck16($key);
   $this->crk($key);
}

private function dd(&$data)
{
   $n = strlen($data) % $this->len;
   $data = $data . str_repeat($this->b, $n);
}

private function ck16($str)
{
   if (strlen($str) !== $this->len) {
         throw new \Exception('秘钥长度为16位');
   }
}

private function add($v)
{
   $arr = unpack('N*', $v);
   $max = 0xffffffff;
   $j = 1;
   for ($i = 4; $i > 0; $i--) {
         if ($arr[$i] > $max - $j) {
            $j    = 1;
            $arr[$i] = 0;
         } else {
            $arr[$i] += $j;
            break;
         }
   }
   return pack('N*', ...$arr);
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function deDataCtr($str, $iv)
{
   return $this->enDataCtr($str, $iv);
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function enDataCtr($str, $iv)
{
   $this->ck16($iv);
   $r = '';
   $this->dd($str);
   $l = strlen($str) / $this->len;
   for ($i = 0; $i < $l; $i++) {
         $s= substr($str, $i * $this->len, $this->len);
         $tr = [];
         $this->encode(array_values(unpack('N*', $iv)), $tr);
         $s1 = pack('N*', ...$tr);
         $s1 = $s1 ^ $s;
         $iv = $this->add($iv);
         $r.= $s1;
   }
   return $r;
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function enDataOfb($str, $iv)
{
   $this->ck16($iv);
   $r = '';
   $this->dd($str);
   $l = strlen($str) / $this->len;
   for ($i = 0; $i < $l; $i++) {
         $s= substr($str, $i * $this->len, $this->len);
         $tr = [];
         $this->encode(array_values(unpack('N*', $iv)), $tr);
         $iv = pack('N*', ...$tr);
         $s1 = $s ^ $iv;
         $r.= $s1;
   }
   return $r;
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function deDataOfb($str, $iv)
{
   return $this->enDataOfb($str, $iv);
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function deDataCfb($str, $iv)
{
   $this->ck16($iv);
   $r = '';
   $this->dd($str);
   $l = strlen($str) / $this->len;
   for ($i = 0; $i < $l; $i++) {
         $s= substr($str, $i * $this->len, $this->len);
         $tr = [];
         $this->encode(array_values(unpack('N*', $iv)), $tr);
         $s1 = pack('N*', ...$tr);
         $s1 = $s ^ $s1;
         $iv = $s;
         $r.= $s1;
   }
   return $r;
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function enDataCfb($str, $iv)
{
   $this->ck16($iv);
   $r = '';
   $this->dd($str);
   $l = strlen($str) / $this->len;
   for ($i = 0; $i < $l; $i++) {
         $s= substr($str, $i * $this->len, $this->len);
         $tr = [];
         $this->encode(array_values(unpack('N*', $iv)), $tr);
         $s1 = pack('N*', ...$tr);
         $iv = $s ^ $s1;
         $r.= $iv;
   }
   return $r;
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function enDataCbc($str, $iv)
{
   $this->ck16($iv);
   $r = '';
   $this->dd($str);
   $l = strlen($str) / $this->len;
   for ($i = 0; $i < $l; $i++) {
         $s= substr($str, $i * $this->len, $this->len);
         $s= $iv ^ $s;
         $tr = [];
         $this->encode(array_values(unpack('N*', $s)), $tr);
         $iv = pack('N*', ...$tr);
         $r.= $iv;
   }
   return $r;
}

/**
* @param string $str 加密字符串
* @param string $iv 初始化字符串16位
* @return string
* @throws \Exception
*/
public function deDataCbc($str, $iv)
{
   $this->ck16($iv);
   $r = '';
   $this->dd($str);
   $l = strlen($str) / $this->len;
   for ($i = 0; $i < $l; $i++) {
         $s= substr($str, $i * $this->len, $this->len);
         $tr = [];
         $this->decode(array_values(unpack('N*', $s)), $tr);
         $s1 = pack('N*', ...$tr);
         $s1 = $iv ^ $s1;
         $iv = $s;
         $r.= $s1;
   }
   return $r;
}

/**
* @param string $str 加密字符串
* @return string
*/
public function enDataEcb($str)
{
   $r = [];
   $this->dd($str);
   $ar = unpack('N*', $str);
   do {
         $this->encode(, $r);
   } while (next($ar));
   return pack('N*', ...$r);
}

/**
* @param string $str 解密字符串
* @return string
*/
public function deDataEcb($str)
{
   $r = [];
   $this->dd($str);
   $ar = unpack('N*', $str);
   do {
         $this->decode(, $r);
   } while (next($ar));
   return pack('N*', ...$r);
}

private function encode($ar, &$r)
{
   for ($i = 0; $i < 32; $i++) {
         $ar[$i + 4] = $this->f($ar[$i], $ar[$i + 1], $ar[$i + 2], $ar[$i + 3], $this->rk[$i]);
   }
   $r[] = $ar;
   $r[] = $ar;
   $r[] = $ar;
   $r[] = $ar;
}

private function decode($ar, &$r)
{
   for ($i = 0; $i < 32; $i++) {
         $ar[$i + 4] = $this->f($ar[$i], $ar[$i + 1], $ar[$i + 2], $ar[$i + 3], $this->rk);
   }
   $r[] = $ar;
   $r[] = $ar;
   $r[] = $ar;
   $r[] = $ar;
}

private function crk($key)
{
   $keys = array_values(unpack('N*', $key));
   $keys = [
         $keys ^ $this->fk,
         $keys ^ $this->fk,
         $keys ^ $this->fk,
         $keys ^ $this->fk
   ];
   for ($i = 0; $i < 32; $i++) {
         $this->rk[] = $keys[] = $keys[$i] ^ $this->t1($keys[$i + 1] ^ $keys[$i + 2] ^ $keys[$i + 3] ^ $this->ck[$i]);
   }
}

private function lm($a, $n)
{
   return ($a >> (32 - $n) | (($a << $n) & 0xffffffff));
}

private function f($x0, $x1, $x2, $x3, $r)
{
   return $x0 ^ $this->t($x1 ^ $x2 ^ $x3 ^ $r);
}

private function s($n)
{
   return $this->Sbox[($n & 0xff)] | $this->Sbox[(($n >> 8) & 0xff)] << 8 | $this->Sbox[(($n >> 16) & 0xff)] << 16 | $this->Sbox[(($n >> 24) & 0xff)] << 24;
}

private function t($n)
{
   $b = $this->s($n);
   return $b ^ $this->lm($b, 2) ^ $this->lm($b, 10) ^ $this->lm($b, 18) ^ $this->lm($b, 24);
}

private function t1($n)
{
   $b = $this->s($n);
   return $b ^ $this->lm($b, 13) ^ $this->lm($b, 23);
}

}
</pre></div>
<p>调用类</p>
<div class="jb51code"><pre class="brush:php;">class RtSm4
{
protected $sm4;
protected $keyLen = 16;
protected $ivLen= 16;

function __construct($key)
{
   $this->sm4 = new Sm4($key);
}

public function encrypt($data, $type = 'sm4', $iv = '', $formatOut = 'hex')
{

   if ($type != 'sm4-ecb') {
         $this->check_iv($iv);
   }
   $ret = '';
   switch ($type) {
         case 'sm4':
         case 'sm4-cbc':
            $data = $this->mystr_pad($data, $this->keyLen); //需要补齐
            $ret= $this->sm4->enDataCbc($data, $iv);
            break;
         case 'sm4-ecb':
            $data = $this->mystr_pad($data, $this->keyLen); //需要补齐
            $ret= $this->sm4->enDataEcb($data);
            break;
         case 'sm4-ctr':
            $ret = $this->sm4->enDataCtr($data, $iv);
            break;
         case 'sm4-ofb':
            $ret = $this->sm4->enDataOfb($data, $iv);
            break;
         case 'sm4-cfb':
            $ret = $this->sm4->enDataCfb($data, $iv);
            break;
         default:
            throw new Exception('bad type');
   }
   if ($formatOut == 'hex') {
         return bin2hex($ret);
   } else if ($formatOut == 'base64') {
         return base64_encode($ret);
   }
   return $ret;
}

public function decrypt($data, $type = 'sm4', $iv = '', $formatInput = 'hex')
{
   if ($type != 'sm4-ecb') {
         $this->check_iv($iv);
   }
   if ($formatInput == 'hex') {
         $data = hex2bin($data);
   } else if ($formatInput == 'base64') {
         $data = base64_decode($data);
   }
   //elseis raw
   switch ($type) {
         case 'sm4':
         case 'sm4-cbc':
            $ret = $this->sm4->deDataCbc($data, $iv);
            $ret = $this->mystr_unpad($ret);
            break;
         case 'sm4-ecb':
            $ret = $this->sm4->deDataEcb($data);
            $ret = $this->mystr_unpad($ret);
            break;
         case 'sm4-ctr':
            $ret = $this->sm4->deDataCtr($data, $iv);
            break;
         case 'sm4-ofb':
            $ret = $this->sm4->deDataOfb($data, $iv);
            break;
         case 'sm4-cfb':
            $ret = $this->sm4->deDataCfb($data, $iv);
            break;
         default:
            throw new Exception('bad type');
   }
   return $ret;
}

//加密前补齐，特定后缀不适用全部的对接方
protected function mystr_pad($data, $len = 16)
{
   $n       = $len - strlen($data) % $len;
   $tmpString = $this->strToHex($data) . "80";
   $tmpString .= str_repeat("00", $n - 1);
   return $this->hexToStr($tmpString);
}

// 解密后去掉补齐，特定后缀不适用全部的对接方
protected function mystr_unpad($data)
{
   $tmp    = $this->strToHex($data);
   $lastIndex = strrpos($tmp, '80');
   if ($lastIndex !== false) {
         $tmp = substr($tmp, 0, $lastIndex);
   }
   return $this->hexToStr($tmp);
}

//加密前补齐，通用代码，无特定需求可用这个
protected function mystr_pad_bak($data, $len = 16)
{
   $n = $len - strlen($data) % $len;
   return $data . str_repeat(chr($n), $n);
}
// 解密后去掉补齐通用的代码，无特定需求可用这个
protected function mystr_unpad_bak($data)
{
   $n = ord(substr($data, -1));
   return substr($data, 0, -$n);
}
protected function check_iv($iv)
{
   if (strlen($iv) != $this->ivLen) {
         throw new Exception('bad iv');
   }
}

protected function strToHex($string)
{
   $hex = unpack('H*', $string);
   return $hex;
}

protected function hexToStr($hex)
{
   $string = pack('H*', $hex);
   return $string;
}
}
</pre></div>
<p>调用</p>
<div class="jb51code"><pre class="brush:php;">$key    = hex2bin('660e5d5xxxxxxx714f346e');
$iv       = hex2bin('abcd0863xxxxxf67');
$sm4    = new RtSm4($key);
$string = 'xxxx';
$encodeText = $sm4->encrypt($string, 'sm4-cbc', $iv);
echo $encodeText . PHP_EOL;
echo $sm4->decrypt($encodeText, 'sm4-cbc', $iv). PHP_EOL;</pre></div>

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PHP SM4加密的实现