需要先了解的openssl系列函数

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• openssl_pkey_get_private 从证书中解析获取私钥，以供使用。成功，返回真实的密钥资源标识符(Resource ID),否则返回false
• openssl_pkey_get_public 从证书中解析获取公钥，以供使用。成功，返回真实的密钥资源标识符(Resource ID),否则返回false
• openssl_private_encrypt($data, $encrypted, $privateKeyResourceID, OPENSSL_PKCS1_PADDING)
• //使用私钥key加密数据data并且将结果保存至变量crypted中
• openssl_public_decrypt(base64_decode($encrypted), $decrypted, $publicKeyResourceID, OPENSSL_PKCS1_PADDING)
• //私钥加密的内容通过公钥可用解密出来

getMessage());
}

加密、解密系列

• 公钥加密 openssl_public_encrypt,私钥解密 openssl_private_decrypt
• 私钥加密 openssl_private_encrypt,公钥解密 openssl_public_decrypt

封装

checkFilePath($publicKeyPath);
        $this->checkFilePath($privatePath);
        $this->publicKeyContent = file_get_contents($publicKeyPath);
        $this->privateKeyContent = file_get_contents($privatePath);
        if (empty($this->publicKeyContent)) throw new \Exception('Public key is empty');
        if (empty($this->privateKeyContent)) throw new \Exception('Private key is empty');

        $this->publicKeyResourceID = !empty($this->publicKeyContent) ? openssl_pkey_get_public($this->getPublicKey()) : false;
        $this->privateKeyresourceID = !empty($this->privateKeyContent) ? openssl_pkey_get_private($this->getPrivatekey()) : false;

        if ($this->publicKeyResourceID === false) throw new \Exception('解析公钥内容失败');
        if ($this->privateKeyresourceID === false) throw new \Exception('解析私钥内容失败');
    }

    /**
     * 校验文件路径
     * @param string $filePath
     * @throws Exception
     */
    public function checkFilePath(string $filePath)
    {
        if (!is_file($filePath)) throw new \Exception($filePath . ' is not a regular file');
        if (!file_exists($filePath)) throw new \Exception($filePath . ' is not exists');
    }

    //获取私有key字符串,重新格式化,为保证任何key都可以识别
    public function getPrivatekey(): string
    {
        $search = [
            "-----BEGIN RSA PRIVATE KEY-----",
            "-----END RSA PRIVATE KEY-----",
            "\n",
            "\r",
            "\r\n"
        ];

        $privateKey = str_replace($search, "", $this->privateKeyContent);
        //打断字符串为指定数量的字串
        return $search[0] . PHP_EOL . wordwrap($privateKey, 64, "\n", true) . PHP_EOL . $search[1];
    }

    /**
     *
     * 获取公共key字符串,重新格式化,为保证任何key都可以识别
     */
    public function getPublicKey()
    {
        $search = [
            "-----BEGIN PUBLIC KEY-----",
            "-----END PUBLIC KEY-----",
            "\n",
            "\r",
            "\r\n"
        ];
        $publicKey = str_replace($search, "", $this->publicKeyContent);
        //打断字符串为指定数量的字串
        return $search[0] . PHP_EOL . wordwrap($publicKey, 64, "\n", true) . PHP_EOL . $search[1];
    }

    public function createKey()
    {
        $result = openssl_pkey_new();// 生成一个新的私钥和公钥对,
        if ($result === false) return false;
        openssl_pkey_export($result, $privateKey);//将key当作PEM编码字符串导出并且将之保存到$privateKey(通过引用传递的)中。
        $publicKey = openssl_pkey_get_details($result);//返回包含密钥详情的数组
        return array('public_key' => $publicKey["key"], 'private_key' => $this->getPrivatekey());
    }

    //使用私钥加密
    public function encryptByPrivateKey(string $data): string
    {
        openssl_private_encrypt($data, $output, $this->privateKeyresourceID);
        return base64_encode($output);
    }

    //使用公钥解密
    public function decryptByPublicKey(string $data): string
    {
        openssl_public_decrypt(base64_decode($data), $output, $this->publicKeyResourceID);
        return $output;
    }

    //使用公钥加密
    public function encryptByPublicKey(string $data): string
    {
        openssl_public_encrypt($data, $output, $this->publicKeyResourceID);
        return base64_encode($output);
    }

    //使用私钥解密
    public function decryptByPrivateKey(string $data): string
    {
        openssl_private_decrypt(base64_decode($data), $output, $this->privateKeyresourceID);
        return $output;
    }

    //生成签名
    public function generateSignature(string $data, int $signType = OPENSSL_ALGO_SHA1): string
    {
        openssl_sign($data, $outSignature, $this->privateKeyresourceID, $signType);//Generate signature
        return base64_encode($outSignature);
    }

    //校验签名 OPENSSL_ALGO_SHA256为RSA2
    public function checkSignature(string $originalData, string $signature, int $signType = OPENSSL_ALGO_SHA1): bool
    {
        //如果签名正确返回 1, 签名错误返回 0, 内部发生错误则返回-1
        $result = openssl_verify($originalData, base64_decode($signature), $this->publicKeyResourceID, $signType);
        return $result == 1;
    }

    public function __destruct()
    {
        openssl_free_key($this->publicKeyResourceID);
        openssl_free_key($this->privateKeyresourceID);
    }
}

$rsaObj = new RSA('/home/zrj/.ssh/rsa_public.key', '/home/zrj/.ssh/rsa_private.key');

$str = 'Hello world';
echo '原始数据:' . $str . PHP_EOL;
echo '公钥加密私钥解密如下:' . PHP_EOL;
$tmpstr = $rsaObj->encryptByPublicKey($str); //用公钥加密
echo '加密后的数据:' . PHP_EOL;
echo $tmpstr . PHP_EOL;
$tmpstr = $rsaObj->decryptByPrivateKey($tmpstr); //用私钥解密
echo '解密结果:' . $tmpstr . PHP_EOL;
echo PHP_EOL;
echo PHP_EOL;
echo '私钥加密公钥解密如下:' . PHP_EOL;
$tmpstr = $rsaObj->encryptByPrivateKey($str); //用私钥加密
echo '私钥加密后的数据:' . PHP_EOL;
echo $tmpstr . PHP_EOL;
$tmpstr = $rsaObj->decryptByPublicKey($tmpstr); //用公钥解密
echo '公钥解密结果:' . $tmpstr . PHP_EOL;

echo PHP_EOL;
echo PHP_EOL;
$signature = $rsaObj->generateSignature($tmpstr);
echo '签名结果为：' . $signature . PHP_EOL;

var_dump($rsaObj->checkSignature($tmpstr, $signature));

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