rsa加密解密方法

       rsa算法介绍

      验证签名的几个算法

define ('OPENSSL_ALGO_SHA1', 1);
define ('OPENSSL_ALGO_MD5', 2);
define ('OPENSSL_ALGO_MD4', 3);
define ('OPENSSL_ALGO_MD2', 4);
define ('OPENSSL_ALGO_DSS1', 5);
define ('OPENSSL_ALGO_SHA224', 6);
define ('OPENSSL_ALGO_SHA256', 7);
define ('OPENSSL_ALGO_SHA384', 8);
define ('OPENSSL_ALGO_SHA512', 9);
define ('OPENSSL_ALGO_RMD160', 10);

    Alipay支付接口的rsa加密解密函数：

    protected function getSignContent($params) {
        ksort($params);

        $stringToBeSigned = "";
        $i = 0;
        foreach ($params as $k => $v) {
            if (false === $this->checkEmpty($v) && "@" != substr($v, 0, 1)) {

                // 转换成目标字符集
                $v = $this->characet($v, $this->postCharset);

                if ($i == 0) {
                    $stringToBeSigned .= "$k" . "=" . "$v";
                } else {
                    $stringToBeSigned .= "&" . "$k" . "=" . "$v";
                }
                $i++;
            }
        }

        unset ($k, $v);
        return $stringToBeSigned;
    }

    /**
     * 读取密钥，并生成rsa签名
     * @param $data     签名数据
     * @return string
     * @throws AuthException
     */
    protected function sign($data) {
        if(isEmpty($this->rsaPrivateKeyFilePath)){
            $priKey = $this->rsaPrivateKey;
            $result = "-----BEGIN RSA PRIVATE KEY-----\n" .
                wordwrap($priKey, 64, "\n", true) .
                "\n-----END RSA PRIVATE KEY-----";
        }else {
            $priKey = file_get_contents($this->rsaPrivateKeyFilePath);
            $result = openssl_get_privatekey($priKey);
        }

        if(!$result){
            throw new AuthException(false, "您使用的私钥格式错误，请检查RSA私钥配置");
        }

        openssl_sign($data, $sign, $result);

        if(!isEmpty($this->rsaPrivateKeyFilePath)){
            openssl_free_key($result);
        }

        $sign = base64_encode($sign);

        return $sign;
    }

    /*公钥验签操作*/
    function verify($data, $sign, $rsaPublicKeyFilePath) {
        if(isEmpty($this->alipayPublicKey)){

            $pubKey= $this->alipayrsaPublicKey;
            $res = "-----BEGIN PUBLIC KEY-----\n" .
                wordwrap($pubKey, 64, "\n", true) .
                "\n-----END PUBLIC KEY-----";
        }else {
            //读取公钥文件
            $pubKey = file_get_contents($rsaPublicKeyFilePath);
            //转换为openssl格式密钥
            $res = openssl_get_publickey($pubKey);
        }

        ($res) or die('支付宝RSA公钥错误。请检查公钥文件格式是否正确');


        $result = (bool)openssl_verify($data, base64_decode($sign), $res);


        if(!isEmpty($this->alipayPublicKey)) {
            //释放资源
            openssl_free_key($res);
        }

        return $result;
    }

    public function rsaEncrypt($data, $rsaPublicKeyPem, $charset) {
        //读取公钥文件
        $pubKey = file_get_contents($rsaPublicKeyPem);
        //转换为openssl格式密钥
        $res = openssl_get_publickey($pubKey);
        $blocks = $this->splitCN($data, 0, 30, $charset);
        $chrtext  = null;
        $encodes  = array();
        foreach ($blocks as $n => $block) {
            if (!openssl_public_encrypt($block, $chrtext , $res)) {
                echo "
" . openssl_error_string() . "
";
            }
            $encodes[] = $chrtext ;
        }
        $chrtext = implode(",", $encodes);

        return $chrtext;
    }

    public function rsaDecrypt($data, $rsaPrivateKeyPem) {
        //读取私钥文件
        $priKey = file_get_contents($rsaPrivateKeyPem);
        //转换为openssl格式密钥
        $res = openssl_get_privatekey($priKey);
        $decodes = explode(',', $data);
        $strnull = "";
        $dcyCOnt= "";
        foreach ($decodes as $n => $decode) {
            if (!openssl_private_decrypt($decode, $dcyCont, $res)) {
                echo "
" . openssl_error_string() . "
";
            }
            $strnull .= $dcyCont;
        }
        return $strnull;
    }

PHP版本的AES加密实现

/**
 * AES加密解密类
 * Class Encripty
 */
class AES{
    /**
     * 加密方法
     * @param string $str
     * @return string
     */
    public function encrypt($str,$screct_key){
        //AES, 128 模式加密数据 CBC
        $screct_key = base64_decode($screct_key);
        $str = trim($str);
        $str = $this->addPKCS7Padding($str);
        $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_CBC),1);
        $encrypt_str =  mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_CBC);
        return base64_encode($encrypt_str);
    }

    /**
     * 解密方法
     * @param string $str
     * @return string
     */
    public function decrypt($str,$screct_key){
        //AES, 128 模式加密数据 CBC
        $str = base64_decode($str);
        $screct_key = base64_decode($screct_key);
        $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,MCRYPT_MODE_CBC),1);
        $encrypt_str =  mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $screct_key, $str, MCRYPT_MODE_CBC);
        $encrypt_str = trim($encrypt_str);

        $encrypt_str = $this->stripPKSC7Padding($encrypt_str);
        return $encrypt_str;
    }

    /**
     * 填充算法
     * @param string $source
     * @return string
     */
    public function addPKCS7Padding($source){
        $source = trim($source);
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);

        $pad = $block - (strlen($source) % $block);
        if ($pad <= $block) {
            $char = chr($pad);
            $source .= str_repeat($char, $pad);
        }
        return $source;
    }

    /**
     * 移去填充算法
     * @param string $source
     * @return string
     */
    public function stripPKSC7Padding($source){
        $source = trim($source);
        $char = substr($source, -1);
        $num = ord($char);
        if($num==62)return $source;
        $source = substr($source,0,-$num);
        return $source;
    }
}