非对称加密

至于什么是非对称加密，这里就不说啦，大家谷歌去吧。这里说明的是，最近在做一个对外的充值加密服务，那么涉及到这个加密的处理，中间遇到几个小问题，所以记录下，方便自己下次查阅。

详细代码

<?php /** * 使用openssl实现非对称加密 * * @since 2015-11-10 */ class Rsa { /** * 私钥 * */ private $_privKey; /** * 公钥 * */ private $_pubKey; /** * 保存文件地址 */ private $_keyPath; /** * 指定密钥文件地址 * */ public function __construct($path) { if (empty($path) || !is_dir($path)) { throw new Exception('请指定密钥文件地址目录'); } $this->_keyPath = $path; } /** * 创建公钥和私钥 * */ public function createKey() { $config = [ "config" => 'D:\wamp\bin\apache\apache2.4.9\conf\openssl.cnf', "digest_alg" => "sha512", "private_key_bits" => 4096, "private_key_type" => OPENSSL_KEYTYPE_RSA, ]; // 生成私钥 $rsa = openssl_pkey_new($config); openssl_pkey_export($rsa, $privKey, NULL, $config); file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'priv.key', $privKey); $this->_privKey = openssl_pkey_get_public($privKey); // 生成公钥 $rsaPri = openssl_pkey_get_details($r); $pubKey = $rsaPri['key']; file_put_contents($this->_keyPath . DIRECTORY_SEPARATOR . 'pub.key', $pubKey); $this->_pubKey = openssl_pkey_get_public($pubKey); } /** * 设置私钥 * */ public function setupPrivKey() { if (is_resource($this->_privKey)) { return true; } $file = $this->_keyPath . DIRECTORY_SEPARATOR . 'priv.key'; $privKey = file_get_contents($file); $this->_privKey = openssl_pkey_get_private($privKey); return true; } /** * 设置公钥 * */ public function setupPubKey() { if (is_resource($this->_pubKey)) { return true; } $file = $this->_keyPath . DIRECTORY_SEPARATOR . 'pub.key'; $pubKey = file_get_contents($file); $this->_pubKey = openssl_pkey_get_public($pubKey); return true; } /** * 用私钥加密 * */ public function privEncrypt($data) { if (!is_string($data)) { return null; } $this->setupPrivKey(); $result = openssl_private_encrypt($data, $encrypted, $this->_privKey); if ($result) { return base64_encode($encrypted); } return null; } /** * 私钥解密 * */ public function privDecrypt($encrypted) { if (!is_string($encrypted)) { return null; } $this->setupPrivKey(); $encrypted = base64_decode($encrypted); $result = openssl_private_decrypt($encrypted, $decrypted, $this->_privKey); if ($result) { return $decrypted; } return null; } /** * 公钥加密 * */ public function pubEncrypt($data) { if (!is_string($data)) { return null; } $this->setupPubKey(); $result = openssl_public_encrypt($data, $encrypted, $this->_pubKey); if ($result) { return base64_encode($encrypted); } return null; } /** * 公钥解密 * */ public function pubDecrypt($crypted) { if (!is_string($crypted)) { return null; } $this->setupPubKey(); $crypted = base64_decode($crypted); $result = openssl_public_decrypt($crypted, $decrypted, $this->_pubKey); if ($result) { return $decrypted; } return null; } /** * __destruct * */ public function __destruct() { @fclose($this->_privKey); @fclose($this->_pubKey); } } ?>

测试

$rsa = new Rsa('ssl-key'); //私钥加密，公钥解密 echo "待加密数据：segmentfault.com\n"; $pre = $rsa->privEncrypt("segmentfault.com"); echo "加密后的密文:\n" . $pre . "\n"; $pud = $rsa->pubDecrypt($pre); echo "解密后数据:" . $pud . "\n"; //公钥加密，私钥解密 echo "待加密数据：segmentfault.com\n"; $pue = $rsa->pubEncrypt("segmentfault.com"); echo "加密后的密文:\n" . $pue . "\n"; $prd = $rsa->privDecrypt($pue); echo "解密后数据:" . $prd;

重要问题

这里特别要注意的是在配置中要指定openssl.cnf的文件地址，或者设置个OPENSSL_CONF全局变量就可以了。