java的非对称ItfRsa.encryptByRSA加密转换成php的openssl RSA加密

java的非对称ItfRsa.encryptByRSA加密转换成php的openssl RSA加密，之前整理了php的openssl加密扩展实现，现在项目用到了RSA加解密，在JAVA与PHP系统之间进行交互，RSA在不同语言的密钥格式不一样，所以过程中主要还是密钥转换问题，经过不断地尝试研究终于搞定了在Java、PHP的转换，可以参考。

参考：https://www.cnblogs.com/jaamy/p/6118814.html

参考：https://www.copylian.com/technology/520.html

JAVA加密代码：

// 时间

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String sys_time = df.format(new Date());

String system_id = "xxxxxxx";

String sign_info = "time:"+sys_time+"@system_id:"+system_id;

byte[] sign_info_byte =  sign_info.getBytes("UTF-8");

//平台企业sign_key

String sign_key = "xxxxxxxx"; // 16进制key

byte[] sign_key_byte=ItfRsa.toByteArray(sign_key);

//获取sign

byte[] sign_encrypt = ItfRsa.encryptByRSA(sign_key_byte, sign_info_byte);

String sign = ItfRsa.toHexString(sign_encrypt); //转成16进制

public static byte[] encryptByRSA(byte[] pubKeyInByte, byte[] data) {

        try {

                KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");

                X509EncodedKeySpec pub_spec = new X509EncodedKeySpec(pubKeyInByte);

                PublicKey pubKey = mykeyFactory.generatePublic(pub_spec); //转成公钥：-----BEGIN PUBLIC KEY-----xxx-----END PUBLIC KEY----

                Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");

                cipher.init(1, pubKey);

                return cipher.doFinal(data);

        } catch (Exception var6) {

                return null;

        }

}

PHP代码：

/**

* 获取签名

* @param $reqData

* @return string

*/

protected function getSign(){

        //加密信息

        $sign_info = "time:".date("Y-m-d H:i:s")."@system_id:".$this->system_id;

        //公钥：16进制的key转成2进制，然后将进行base64_encode加密

        $pubKey = "-----BEGIN PUBLIC KEY-----\n".base64_encode(hex2bin($this->sign_key))."\n-----END PUBLIC KEY-----";

        //加密

        openssl_public_encrypt($sign_info, $ciphertext, $pubKey, OPENSSL_PKCS1_PADDING);

        //返回

        return bin2hex($ciphertext);

}