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How to implement asymmetric encryption in php: First create a PHP sample file; then use openssl to implement asymmetric encryption; finally test it through "$rsa = new Rsa('ssl-key');" .
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PHP implements asymmetric encryption
#As for what asymmetric encryption is, I won’t go into it here, just Google it. What is explained here is that I have recently been working on an external recharge encryption service, so when it comes to the encryption processing, I encountered a few small problems in the process, so I recorded it for my convenience to check next time.
Detailed code
<?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 $rsaPri = openssl_pkey_get_details($rsa); $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); } } ?>
Test
$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;
Important issues
Special attention should be paid here to specify the file address of openssl.cnf in the configuration, or Just set the OPENSSL_CONF global variable.
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