PHP非对称加密（公钥加密私钥解密）：RSA (RSA/ECB/PKCS1Padding)+base64_encode/bin2hex加密_php rsa

所谓非对称，就是使用公钥/私钥加密，然后用对应的私钥/公钥解密

 1.配对的公钥，私钥：

//公钥（注意包括头（-----BEGIN PUBLIC KEY-----）尾（-----END PUBLIC KEY-----）标志）
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbdq5NjtUEkAQ6wucPuhC0aRvSMsaX3GrhkwsLLdWZnVNVpkJRw
yPFq9HJNuntRw7P9Sb3TkwrpN60x62kZ6qV8h1GoG4jIfofuVWPv1VzudAV6kWJWMl3sc
+DtV5q1dy1KQLb6e90cuOynzxVT3j+Fx7ZOzovmdTkEcoRiYWV1QIDAQAB
-----END PUBLIC KEY-----
 
 
//私钥（注意包括头（-----BEGIN RSA PRIVATE KEY-----）尾（-----END RSA PRIVATE KEY-----）标志）
-----BEGIN RSA PRIVATE KEY-----
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
-----END RSA PRIVATE KEY-----

 2.判断openssl扩展是否安装

 extension_loaded('openssl') or die('PHP加密需要openssl扩展支持');

3.判断公钥和私钥是否可用 

//私钥文件路径   
$this->privateKey = file_get_contents(dirname(__FILE__) .'libraries/YCPAY/account/rsa_private_key.pem');
 
//公钥文件路径   
$this->publicKey = file_get_contents(dirname(__FILE__) . 'libraries/YCPAY/account/rsa_public_key.pem');  
 
/**
* 生成Resource类型的密钥，如果密钥文件内容被破坏，openssl_pkey_get_private函数返回false
*/
$privateKey = openssl_pkey_get_private($this->privateKey);
 
 
/**
* 生成Resource类型的公钥，如果公钥文件内容被破坏，openssl_pkey_get_public函数返回false
*/
$publicKey = openssl_pkey_get_public($this->publicKey);
 
($privateKey) or die('密钥不可用');
($publicKey) or die('公钥不可用');

4.公钥加密

由于openssl_public_encrypt()加密对加密串有字符限制(117字节)，所有需要分段加密(每段32个字符，加密后拼接起来)

    define("BAOFOO_ENCRYPT_LEN", 32);    
    // 公钥加密
    function encryptedByPublicKey($data_content)
    {
        $publicKey = openssl_pkey_get_public($this->publicKey);
        $encrypted = "";
        $totalLen = strlen($data_content);