下载开源RSA密钥生成工具openssl（通常Linux系统都自带该程序），解压缩至独立的文件夹，进入其中的bin目录，执行以下命令：
a、openssl genrsa -out rsa_private_key.pem 1024
b、openssl pkcs8 -topk8 -inform PEM -in rsa_private_key.pem -outform PEM -nocrypt -out private_key.pem
c、openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
第一条命令生成原始 RSA私钥文件 rsa_private_key.pem
第二条命令将原始 RSA私钥转换为 pkcs8格式
第三条生成RSA公钥 rsa_public_key.pem
上面几个就可以看出：通过私钥能生成对应的公钥
RSA类：
<?php
class Rsa {
/**
* 获取私钥
* @return bool|resource
*/
private static function getPrivateKey()
{
$abs_path = dirname(__FILE__) . '/rsa_private_key.pem';
$content = file_get_contents($abs_path);
return openssl_pkey_get_private($content);
}
/**
* 获取公钥
* @return bool|resource
*/
private static function getPublicKey()
{
$abs_path = dirname(__FILE__) . '/rsa_public_key.pem';
$content = file_get_contents($abs_path);
return openssl_pkey_get_public($content);
}
/**
* 私钥加密
* @param string $data
* @return null|string
*/
public static function privEncrypt($data = '')
{
if (!is_string($data)) {
return null;
}
return openssl_private_encrypt($data,$encrypted,self::getPrivateKey()) ? base64_encode($encrypted) : null;
}
/**
* 公钥加密
* @param string $data
* @return null|string
*/
public static function publicEncrypt($data = '')
{
if (!is_string($data)) {
return null;
}
return openssl_public_encrypt($data,$encrypted,self::getPublicKey()) ? base64_encode($encrypted) : null;
}
/**
* 私钥解密
* @param string $encrypted
* @return null
*/
public static function privDecrypt($encrypted = '')
{
if (!is_string($encrypted)) {
return null;
}
return (openssl_private_decrypt(base64_decode($encrypted), $decrypted, self::getPrivateKey())) ? $decrypted : null;
}
/**
* 公钥解密
* @param string $encrypted
* @return null
*/
public static function publicDecrypt($encrypted = '')
{
if (!is_string($encrypted)) {
return null;
}
return (openssl_public_decrypt(base64_decode($encrypted), $decrypted, self::getPublicKey())) ? $decrypted : null;
}
}
demo:
<?php
require_once "Rsa.php";
$rsa = new Rsa();
$data['name'] = 'Tom';
$data['age'] = '20';
$privEncrypt = $rsa->privEncrypt(json_encode($data));
echo '私钥加密后:'.$privEncrypt.'<br>';
$publicDecrypt = $rsa->publicDecrypt($privEncrypt);
echo '公钥解密后:'.$publicDecrypt.'<br>';
$publicEncrypt = $rsa->publicEncrypt(json_encode($data));
echo '公钥加密后:'.$publicEncrypt.'<br>';
$privDecrypt = $rsa->privDecrypt($publicEncrypt);
echo '私钥解密后:'.$privDecrypt.'<br>';
也有一些网站提供生成rsa公钥私钥的服务：http://www.bm8.com.cn/webtool/rsa/
文章参考：https://www.cnblogs.com/xuweiqiang/p/9784584.html
