Implementation of RSA encryption and decryption algorithm functions

This time I will bring you the implementation of the RSA encryption and decryption algorithm function. What are the precautions for the implementation of the RSA encryption and decryption algorithm function. The following is a practical case, let's take a look.

You can first go to the website http://web.chacuo.net/netrsakeypair to generate public and private keys online

RSA asymmetric encryption algorithm, if it is public key encryption, just You have to use the private key to decrypt, and vice versa. If the private key is encrypted, use the public key to decrypt. The following are the relevant implementation functions

/**
 * RSA私钥加密
 * @param string $private_key 私钥
 * @param string $data 要加密的字符串
 * @return string $encrypted 返回加密后的字符串
 * @author mosishu
 */
function privateEncrypt($private_key,$data){
 $encrypted = '';
 $pi_key = openssl_pkey_get_private($private_key);//这个函数可用来判断私钥是否是可用的，可用返回资源id Resource id
 //最大允许加密长度为117，得分段加密
 $plainData = str_split($data, 100);//生成密钥位数 1024 bit key
 foreach($plainData as $chunk){
  $partialEncrypted = '';
  $encryptionOk = openssl_private_encrypt($chunk,$partialEncrypted,$pi_key);//私钥加密
  if($encryptionOk === false){
   return false;
  }
  $encrypted .= $partialEncrypted;
 }

 $encrypted = base64_encode($encrypted);//加密后的内容通常含有特殊字符，需要编码转换下，在网络间通过url传输时要注意base64编码是否是url安全的
 return $encrypted;
}

/**
 * RSA公钥解密(私钥加密的内容通过公钥可以解密出来)
 * @param string $public_key 公钥
 * @param string $data 私钥加密后的字符串
 * @return string $decrypted 返回解密后的字符串
 * @author mosishu
 */
function publicDecrypt($public_key,$data){
 $decrypted = '';
 $pu_key = openssl_pkey_get_public($public_key);//这个函数可用来判断公钥是否是可用的
 $plainData = str_split(base64_decode($data), 128);//生成密钥位数 1024 bit key
 foreach($plainData as $chunk){
  $str = '';
  $decryptionOk = openssl_public_decrypt($chunk,$str,$pu_key);//公钥解密
  if($decryptionOk === false){
   return false;
  }
  $decrypted .= $str;
 }
 return $decrypted;
}

//RSA公钥加密
function publicEncrypt($public_key,$data){
 $encrypted = '';
 $pu_key = openssl_pkey_get_public($public_key);
 $plainData = str_split($data, 100);
 foreach($plainData as $chunk){
  $partialEncrypted = '';
  $encryptionOk = openssl_public_encrypt($chunk,$partialEncrypted,$pu_key);//公钥加密
  if($encryptionOk === false){
   return false;
  }
  $encrypted .= $partialEncrypted;
 }
 $encrypted = base64_encode($encrypted);
 return $encrypted;
}

//RSA私钥解密
function privateDecrypt($private_key,$data){
 $decrypted = '';
 $pi_key = openssl_pkey_get_private($private_key);
 $plainData = str_split(base64_decode($data), 128);
 foreach($plainData as $chunk){
  $str = '';
  $decryptionOk = openssl_private_decrypt($chunk,$str,$pi_key);//私钥解密
  if($decryptionOk === false){
   return false;
  }
  $decrypted .= $str;
 }
 return $decrypted;
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to php Other related articles on the Chinese website!

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