PHP实现RSA加解密算法示例(生成密钥位数为1024位的方法)

RSA非对称加密算法，如果是公钥加密，就得用私钥解密，反过来也一样，私钥加密的就用公钥解密，以下是相关实现函数

/**
* 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;
}