Example of RSA encryption class implemented in php
This article mainly introduces the implementation of RSA encryption class in php. The example analyzes the techniques of php custom RSA class to implement encryption and decryption, which is very useful. Practical value, friends in need can refer to it
The example in this article describes the implementation of RSA encryption class in PHP. Share it with everyone for your reference. The specific analysis is as follows:
Signature, signature verification, and asymmetric encryption and decryption implemented through openssl need to be used with x.509 certificate (such as crt and pem) files.
Due to various reasons, this class is not very complete, and various tests are welcome!
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/** * RSA algorithm class * Signature and ciphertext encoding: base64 string/hex string/binary string stream * Padding method: PKCS1Padding (encryption and decryption)/NOPadding (decryption) * * Notice:Only accepts a single block. Block size is equal to the RSA key size! * If the key length is 1024 bit, the data during encryption must be less than 128 bytes, plus the 11 bytes of PKCS1Padding itself, so the plaintext must be less than 117 bytes * * @author: linvo * @version: 1.0.0 * @date: 2013/1/23 */ class RSA{ private $pubKey = null; private $priKey = null; /** * Custom error handling */ private function _error($msg){ die('RSA Error:' . $msg); //TODO } /** * Constructor * * @param string public key file (passed in during signature verification and encryption) * @param string private key file (passed in when signing and decrypting) */ public function __construct($public_key_file = '', $private_key_file = ''){ if ($public_key_file){ $this->_getPublicKey($public_key_file); } if ($private_key_file){ $this->_getPrivateKey($private_key_file); } } /** * Generate signature * * @param string signature material * @param string signature encoding (base64/hex/bin) * @return signature value */ public function sign($data, $code = 'base64'){ $ret = false; if (openssl_sign($data, $ret, $this->priKey)){ $ret = $this->_encode($ret, $code); } return $ret; } /** * Verify signature * * @param string signature material * @param string signature value * @param string signature encoding (base64/hex/bin) * @return bool */ public function verify($data, $sign, $code = 'base64'){ $ret = false; $sign = $this->_decode($sign, $code); if ($sign !== false) { switch (openssl_verify($data, $sign, $this->pubKey)){ case 1: $ret = true; break; case 0: case -1: default: $ret = false; } } return $ret; } /** * Encryption * * @param string plain text * @param string ciphertext encoding (base64/hex/bin) * @param int filling method (it seems that PHP has a bug, so it currently only supports OPENSSL_PKCS1_PADDING) * @return string ciphertext */ public function encrypt($data, $code = 'base64', $padding = OPENSSL_PKCS1_PADDING){ $ret = false; if (!$this->_checkPadding($padding, 'en')) $this->_error('padding error'); if (openssl_public_encrypt($data, $result, $this->pubKey, $padding)){ $ret = $this->_encode($result, $code); } return $ret; } /** * Decryption * * @param string ciphertext * @param string ciphertext encoding (base64/hex/bin) * @param int padding method (OPENSSL_PKCS1_PADDING / OPENSSL_NO_PADDING) * @param bool Whether to flip the plaintext (When passing Microsoft CryptoAPI-generated RSA cyphertext, revert the bytes in the block) * @return string plain text */ public function decrypt($data, $code = 'base64', $padding = OPENSSL_PKCS1_PADDING, $rev = false){ $ret = false; $data = $this->_decode($data, $code); if (!$this->_checkPadding($padding, 'de')) $this->_error('padding error'); if ($data !== false){ if (openssl_private_decrypt($data, $result, $this->priKey, $padding)){ $ret = $rev ? rtrim(strrev($result), " |

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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