Detailed explanation of the steps for PHP+RSA to generate a key with 1024 bits

This time I will bring you a detailed explanation of the steps for generating a key with a 1024-bit key for PHP RSA. What are the precautions for PHP RSA to generate a key with a 1024-bit key? The following is a practical case. Get up and take a look.

RSA asymmetric encryption algorithm, if it is public key encryption, you must 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 other related articles on the php Chinese website!

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The above is the detailed content of Detailed explanation of the steps for PHP+RSA to generate a key with 1024 bits. For more information, please follow other related articles on the PHP Chinese website!