


Detailed explanation of php pki encryption technology (openssl)_PHP tutorial
//pki encryption
/ /Using pki encryption requires opening the openssl extension
//php.ini extension = php_openssl.dll extension
/*pki mode is
* Public key encryption, private key decryption;
* Private key encryption, Public key decryption;
*/
//Private key encryption, public key decryption
//Client
//$data data
$data = 'abcd';
/ /Get the private key $priv_key_id
$priv_key_id = openssl_get_privatekey(file_get_contents('99bill-rsa.pem', r));
//Get the public key $pub_key_id
$pub_key_id = openssl_get_publickey(file_get_contents('99bill -rsa.cer', r));
//$data is first encrypted by SHA1 hash, and then encrypted by $priv_key_id private key to generate signature $signature
//$signature is the encrypted signature
//openssl_sign() encryption function, I don’t know its decryption method? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
openssl_sign($data, $signature, $priv_key_id, OPENSSL_ALGO_SHA1);
//There are also two encryption functions, and these two encryption functions have decryption methods, know
//First Type: private key encryption, public key decryption
//$data is the data to be encrypted, $crypted is the data generated by encryption, $decrypted is the data generated by decryption; $data and $decrypted have the same value
//Encrypt by $priv_key_id private key to generate $crypted;
openssl_private_encrypt($data, $crypted, $priv_key_id);
echo $crypted;
//Decrypt by $pub_key_id public key to generate $decrypted
openssl_public_decrypt($crypted, $decrypted, $pub_key_id);
//Second type: public key encryption, private key decryption
//$data The data to be encrypted, $ crypted is the data generated by encryption, $decrypted is the data generated by decryption; $data and $decrypted have the same value
//Encrypted by the $pub_key_id public key to generate $crypted;
openssl_public_encrypt($data, $crypted, $ pub_key_id);
//Decrypt through the $priv_key_id private key to generate $decrypted
openssl_private_decrypt($crypted, $decrypted, $priv_key_id);
//Note, I get the public key and private key here The key files are not corresponding
// Normally, there is a one-to-one correspondence between the public key and the private key files. Here I use Kuaiqian.
//Kuaiqian gave me the private key generation file, and the corresponding public key generation file is over there.
//Kuaiqian gave me the public key generation file, and the corresponding private key generation file is over there.
//That is, a public key generation file and a private key generation file are missing
//I have never found a one-to-one corresponding private key and public key generation file. If you find one, send me one. Thank you.
// The openssl_verify() method verifies whether the signature is correct (the data generated by private key encryption is returned and verified with the corresponding public key). This is the only case.
// $signature public key encryption generated data, $data original data, returns 1 if successful, 0 on failure, -1 on error
// $pub_key_id public key
openssl_verify($data, $signature , $pub_key_id);
//Release the private key or public key from memory
openssl_free_key($priv_key_id);
openssl_free_key($pub_key_id);
Generate private and public keys
genrsa -out private-rsa.pem
rsa -in private-rsa.pem -pubout -out public-rsa.cer

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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