本文主要向大家介绍了PHP语言 使用非对称加密算法（RSA），通过具体的内容向大家展示，希望对大家学习php语言有所帮助。

公开密钥与私有密钥是一对，如果用公开密钥对数据进行加密，只有用对应的私有密钥才能解密；
如果用私有密钥对数据进行加密，那么只有用对应的公开密钥才能解密。
因为加密和解密使用的是两个不同的密钥，所以这种算法叫作非对称加密算法。

服务端类库

class Rsa {    

    private static $PRIVATE_KEY = '-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----';    

    private static $PUBLIC_KEY = '-----BEGIN PUBLIC KEY-----MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCoZZ8iUBprOIc0kGckr5ax6/Fd9IKKMc/XHayKEAvqpS0oz0b1ojEkpkdZBk0OWNhp73YNV+YLKBwwxOwb3u3hl8nBLoG/RilEbBMdCf55cUzNsfn/XF5CiLr/aci/OHuTe6ULvXs280T5M+nUh3iKdiT6z9XrFbH69C+xFoNInwIDAQAB-----END PUBLIC KEY-----';   

    /**     

     * 获取私钥     

     * @return bool|resource     

     */    

    private static function getPrivateKey()

    {        

        $privKey = self::$PRIVATE_KEY;        

        return openssl_pkey_get_private($privKey);    

    }    

    /**     

     * 获取公钥     

     * @return bool|resource     

     */    

    private static function getPublicKey()

    {        

        $publicKey = self::$PUBLIC_KEY;        

        return openssl_pkey_get_public($publicKey);    

    }    

    /**     

     * 私钥加密     

     * @param string $data     

     * @return null|string     

     */    

    public static function privEncrypt($data = '')    

    {        

        if (!is_string($data)) {            

            return null;       

        }        

        return openssl_private_encrypt($data,$encrypted,self::getPrivateKey()) ? base64_encode($encrypted) : null;    

    }    

    /**     

     * 公钥加密     

     * @param string $data     

     * @return null|string     

     */    

    public static function publicEncrypt($data = '')   

    {        

        if (!is_string($data)) {            

            return null;        

        }        

        return openssl_public_encrypt($data,$encrypted,self::getPublicKey()) ? base64_encode($encrypted) : null;    

    }    

    /**     

     * 私钥解密     

     * @param string $encrypted     

     * @return null     

     */    

    public static function privDecrypt($encrypted = '')    

    {        

        if (!is_string($encrypted)) {            

            return null;        

        }        

        return (openssl_private_decrypt(base64_decode($encrypted), $decrypted, self::getPrivateKey())) ? $decrypted : null;    

    }    

    /**     

     * 公钥解密     

     * @param string $encrypted     

     * @return null     

     */    

    public static function publicDecrypt($encrypted = '')    

    {        

        if (!is_string($encrypted)) {            

            return null;        

        }        

    return (openssl_public_decrypt(base64_decode($encrypted), $decrypted, self::getPublicKey())) ? $decrypted : null;    

    }

}

服务端使用

require_once "Rsa.php";

$rsa = new Rsa();

$data['name'] = 'Tom';

$data['age']  = '20';

$privEncrypt = $rsa->privEncrypt(json_encode($data));echo '私钥加密后:'.$privEncrypt.'<br>';

$publicDecrypt = $rsa->publicDecrypt($privEncrypt);echo '公钥解密后:'.$publicDecrypt.'<br>';

$publicEncrypt = $rsa->publicEncrypt(json_encode($data));echo '公钥加密后:'.$publicEncrypt.'<br>';

$privDecrypt = $rsa->privDecrypt($publicEncrypt);echo '私钥解密后:'.$privDecrypt.'<br>';

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