前言：

最近在用PHP开发一个财务管理系统，里面涉及一些核心的机密数据需要使用到加密解密功能，现在我把这个项目中有用到加密解密算法整理了一下，如果你们刚好也在项目中需要用到这些加密解密算法可以参考一下。这边汇总的加密算法主要有MD5加密，RSA加密算法，异或加密算法，支付宝的RSA加密等方式，具体代码如下：

md5

function encryptMd5($param='', $key=''){
    if(is_array($param)){
        ksort($param);
        reset($param);
        $list = array();
        foreach ($param as $k => $v) {
            $list[] = $k . '=' .$v;
        }
        $md5Str = implode('&', $list);
    }else{
        $md5Str = $param;
    }
    $md5 = md5($md5Str . $key);
    return '' === $param ? 'false' : $md5;
}

$private_key = file_get_contents('rsa_private_key.pem');
$public_key = file_get_contents('rsa_public_key.pem');
 
$pi_key =  openssl_pkey_get_private($private_key);// 可用返回资源id
$pu_key = openssl_pkey_get_public($public_key);
 
// 加密数据
$data = array(
    'id' => '1234567890',
    'name' => '小明',
    'mobile' => '123456',
);
$data = json_encode($data);
 
$encrypted = '';
$decrypted = '';
 
// openssl_public_encrypt($data, $encrypted, $pu_key);//公钥加密
// $encrypted = base64_encode($encrypted);// base64传输
// openssl_private_decrypt(base64_decode($encrypted), $decrypted, $pi_key);//私钥解密
// echo $decrypted,"<br/>";
 
openssl_private_encrypt($data, $encrypted, $pi_key);//私钥加密
$encrypted = base64_encode($encrypted);
openssl_public_decrypt(base64_decode($encrypted), $decrypted, $pu_key);//公钥解密
echo $decrypted,"<br/>";

openssl genrsa -out rsa_private_key.pem 1024
openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem

function xor_encrypt($str,$key){
    $key = md5($key);
    $k = md5(rand(0,100));//相当于动态密钥
    $k = substr($k,0,3);
    $tmp = '';
    for($i=0;$i<strlen($str);$i++){
        $tmp .= substr($str,$i,1) ^ substr($key,$i,1);
    }
    return base64_encode($k.$tmp);
}

function xor_decrypt($str,$key){
    $len = strlen($str);
    $key = md5($key);
    $str = base64_decode($str);
    $str = substr($str,3,$len-3);
    $tmp = '';
    for($i=0;$i<strlen($str);$i++){
        $tmp .=substr($str,$i,1) ^ substr($key,$i,1);
    }
    return $tmp;
}

function rsa_sign($data, $private_key_path){
    //读取私钥文件
    $priKey = file_get_contents($private_key_path);//私钥文件路径
    //转换为openssl密钥，必须是没有经过pkcs8转换的私钥
    $res = openssl_get_privatekey($priKey);
    //$res = openssl_pkey_get_private($priKey);
    //调用openssl内置签名方法，生成签名$sign
    openssl_sign($data, $sign, $res);
    //释放资源
    openssl_free_key($res);
    //base64编码
    $sign = base64_encode($sign);
    return $sign;
}

function rsa_verify($data, $sign, $public_key_path) {
    // 堆代码 duidaima.com
    // 读取公钥文件
    $pubKey = file_get_contents($public_key_path);//公钥文件路径
    // 转换为openssl格式密钥
    $res = openssl_get_publickey($pubKey);
    // 调用openssl内置方法验签，返回bool值
    $result = (bool) openssl_verify ( $data, base64_decode ( $sign ), $res );
    // 释放资源
    openssl_free_key($res);
    return $result;
}

xxtea (+pecl)

function xxtea_long2str($v, $w) {
    $len = count($v);
    $n = ($len - 1) << 2;
    if ($w) {
        $m = $v[$len - 1];
        if (($m < $n - 3) || ($m > $n)) return FALSE;
        $n = $m;
    }
    $s = array();
    for ($i = 0; $i < $len; $i++) {
        $s[$i] = pack("V", $v[$i]);
    }
    if ($w) {
        return substr(join('', $s), 0, $n);
    }
    else {
        return join('', $s);
    }
}
function xxtea_str2long($s, $w) {
    $v = unpack("V*", $s. str_repeat("\0", (4 - strlen($s) % 4) & 3));
    $v = array_values($v);
    if ($w) {
        $v[count($v)] = strlen($s);
    }
    return $v;
}
function xxtea_int32($n) {
    while ($n >= 2147483648) $n -= 4294967296;
    while ($n <= -2147483649) $n += 4294967296;
    return (int)$n;
}
function xxtea_encrypt($str, $key) {
    if($str == '') return '';
    $v = xxtea_str2long($str, TRUE);
    $k = xxtea_str2long($key, FALSE);
    if (count($k) < 4) {
        for ($i = count($k); $i < 4; $i++) {
            $k[$i] = 0;
        }
    }
    $n = count($v) - 1;
 
    $z = $v[$n];
    $y = $v[0];
    $delta = 0x9E3779B9;
    $q = floor(6 + 52 / ($n + 1));
    $sum = 0;
    while (0 < $q--) {
        $sum = xxtea_int32($sum + $delta);
        $e = $sum >> 2 & 3;
        for ($p = 0; $p < $n; $p++) {
            $y = $v[$p + 1];
            $mx = xxtea_int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ xxtea_int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
            $z = $v[$p] = xxtea_int32($v[$p] + $mx);
        }
        $y = $v[0];
        $mx = xxtea_int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ xxtea_int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
        $z = $v[$n] = xxtea_int32($v[$n] + $mx);
    }
    return base64_encode(xxtea_long2str($v, FALSE));
}
function xxtea_decrypt($str, $key) {
    $str = base64_decode($str);
    if($str == '') return '';
    $v = xxtea_str2long($str, FALSE);
    $k = xxtea_str2long($key, FALSE);
    if(count($k) < 4) {
        for ($i = count($k); $i < 4; $i++) {
            $k[$i] = 0;
        }
    }
    $n = count($v) - 1;
 
    $z = $v[$n];
    $y = $v[0];
    $delta = 0x9E3779B9;
    $q = floor(6 + 52 / ($n + 1));
    $sum = xxtea_int32($q * $delta);
    while ($sum != 0) {
        $e = $sum >> 2 & 3;
        for ($p = $n; $p > 0; $p--) {
            $z = $v[$p - 1];
            $mx = xxtea_int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ xxtea_int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
            $y = $v[$p] = xxtea_int32($v[$p] - $mx);
        }
        $z = $v[$n];
        $mx = xxtea_int32((($z >> 5 & 0x07ffffff) ^ $y << 2) + (($y >> 3 & 0x1fffffff) ^ $z << 4)) ^ xxtea_int32(($sum ^ $y) + ($k[$p & 3 ^ $e] ^ $z));
        $y = $v[0] = xxtea_int32($v[0] - $mx);
        $sum = xxtea_int32($sum - $delta);
    }
    return xxtea_long2str($v, TRUE);
}

以上就是我总结的在开发这个财务系统时用到的加密解密算法，大家可以参考一下实现方式。如果项目中有需要用到加密等功能，上面的代码也是可以直接在项目中使用的。如果大家还有其它更好的加密解密算法，欢迎大家在评论区留言讨论，谢谢大家。