php RSA和AES加密算法

一、RSA加密

RSA只说PHP中的应用，详细的算法原理解释，请自行百度，或者参考（RSA加密算法-详细解释以及公钥加密为什么每次都不一样）

总结：公钥加密、私钥解密、私钥签名、公钥验签。

注意：

1、加密方式：公钥加密、私钥解密、私钥签名、公钥验签。

2、明文超出长度，请分段加密，解密也一样

<?php

class Rsa
{
    const CHAR_SET = "UTF-8";
    const BASE_64_FORMAT = "UrlSafeNoPadding";
    const RSA_ALGORITHM_KEY_TYPE = OPENSSL_KEYTYPE_RSA;
    const RSA_ALGORITHM_SIGN = OPENSSL_ALGO_SHA256;

    protected $public_key;
    protected $private_key;
    protected $key_len;

    public function __construct($pub_key, $pri_key = null)
    {
        $this->public_key  = $pub_key;
        $this->private_key = $pri_key;

        $pub_id = openssl_get_publickey($this->public_key);
        $this->key_len = openssl_pkey_get_details($pub_id)['bits'];
    }

    /*
     * 创建密钥对
     */
    public static function createKeys($key_size = 2048)
    {
        $config = array(
            "private_key_bits" => $key_size,
            "private_key_type" => self::RSA_ALGORITHM_KEY_TYPE,
        );
        $res = openssl_pkey_new($config);
        openssl_pkey_export($res, $private_key);
        $public_key_detail = openssl_pkey_get_details($res);
        $public_key = $public_key_detail["key"];

        return [
            "public_key" => $public_key,
            "private_key" => $private_key,
        ];
    }

    /*
     * 公钥加密
     */
    public function publicEncrypt($data)
    {
        $encrypted = '';
        $part_len = $this->key_len / 8 - 11;
        $parts = str_split($data, $part_len);

        foreach ($parts as $part) {
            $encrypted_temp = '';
            openssl_public_encrypt($part, $encrypted_temp, $this->public_key);
            $encrypted .= $encrypted_temp;
        }

        return $this->url_safe_base64_encode($encrypted);
    }

    /*
     * 私钥解密
     */
    public function privateDecrypt($encrypted)
    {
        $decrypted = "";
        $part_len = $this->key_len / 8;
        $base64_decoded = url_safe_base64_decode($encrypted);
        $parts = str_split($base64_decoded, $part_len);

        foreach ($parts as $part) {
            $decrypted_temp = '';
            openssl_private_decrypt($part, $decrypted_temp,$this->private_key);
            $decrypted .= $decrypted_temp;
        }
        return $decrypted;
    }

    /*
     * 私钥加密
     */
    public function privateEncrypt($data)
    {
        $encrypted = '';
        $part_len = $this->key_len / 8 - 11;
        $parts = str_split($data, $part_len);

        foreach ($parts as $part) {
            $encrypted_temp = '';
            openssl_private_encrypt($part, $encrypted_temp, $this->private_key);
            $encrypted .= $encrypted_temp;
        }

        return $this->url_safe_base64_encode($encrypted);
    }

    /*
     * 公钥解密
     */
    public function publicDecrypt($encrypted)
    {
        $decrypted = "";
        $part_len = $this->key_len / 8;
        $base64_decoded = url_safe_base64_decode($encrypted);
        $parts = str_split($base64_decoded, $part_len);

        foreach ($parts as $part) {
            $decrypted_temp = '';
            openssl_public_decrypt($part, $decrypted_temp,$this->public_key);
            $decrypted .= $decrypted_temp;
        }
        return $decrypted;
    }

    /*
     * 数据签名
     */
    public function sign($data)
    {
        openssl_sign($data, $sign, $this->private_key, self::RSA_ALGORITHM_SIGN);

        return $this->url_safe_base64_encode($sign);
    }

    /*
     * 数据签名验证
     */
    public function verify($data, $sign)
    {
        $pub_id = openssl_get_publickey($this->public_key);
　　     //如果$data没有进行base64,请进行 base64后再验证
        $res = openssl_verify($data, $this->url_safe_base64_decode($sign), $pub_id, self::RSA_ALGORITHM_SIGN);
        return $res;
    }

    /*
     * base64_encode处理特殊字符（也有可能不需要替换，直接base64）
     */
    public function url_safe_base64_encode ($data) {
        return str_replace(array('+','/', '='),array('-','_', ''), base64_encode($data));
    }

    /*
     * base64_decode处理特殊字符(也有可能不需要，直接base64)
     */
    public function url_safe_base64_decode ($data) {
        $base_64 = str_replace(array('-','_'),array('+','/'), $data);
        return base64_decode($base_64);
    }

}

?>

二、AES加密

AES加密算法原理自行百度或者：参考链接

mcrypt模块也可以实现：参考链接

php的openssl模块实现aes加密，比较简单

<?php

/* 
 * AES加密
 */
class Aes
{
    /**
     *var string $method 加解密方法，可通过openssl_get_cipher_methods()获得
　　  */
    private $method;

    /**
     * var string $secret_key 加解密的密钥
     */
    private $secret_key;

    /**
     * var string $iv 密初始化向量,加解密的向量，有些方法需要设置
     */
    private $iv;

    /**
     * var string $options false-原始数据；true-base64后的数据
     */
    private $options;

    /**
     * 构造函数
     *
     * @param string $key 密钥
     * @param string $method 加密方式
     * @param string $iv iv向量
     * @param mixed $options false-原始数据；true-base64后的数据
     *
     */
    public function __construct()
    {
        $this->secret_key   = 'xxxxxxxxxx'; //自己的秘钥
        $this->method       = 'AES-128-CBC';
        $this->iv           = openssl_random_pseudo_bytes(openssl_cipher_iv_length($this->method));
        $this->options      = false;
    }

    /**
     * 加密方法，对数据进行加密，返回加密后的数据
     *
     * @param string $data 要加密的数据
     *
     * @return string
     *
     */
    public function encrypt($data)
    {
        $encrypted = openssl_encrypt($data, $this->method, $this->secret_key, $this->options, $this->iv);
        return base64_encode($encrypted . '::' . $this->iv);
    }

    /**
     * 解密方法，对数据进行解密，返回解密后的数据
     *
     * @param string $data 要解密的数据
     *
     * @return string
     *
     */
    public function decrypt($data)
    {
        $arr = explode('::', base64_decode($data));
        $encrypted_data = $arr[0];
        $iv             = $arr[1];
        return openssl_decrypt($encrypted_data, $this->method, $this->secret_key, $this->options, $iv);
    }

}