一、RSA加密
RSA只说PHP中的应用，详细的算法原理解释，请自行百度，或者参考（RSA加密算法-详细解释以及公钥加密为什么每次都不一样）
总结：公钥加密、私钥解密、私钥签名、公钥验签。
注意：
1、加密方式：公钥加密、私钥解密、私钥签名、公钥验签。
2、明文超出长度，请分段加密，解密也一样
<?php class Rsa { const CHAR_SET = "UTF-8"; const BASE_64_FORMAT = "UrlSafeNoPadding"; const RSA_ALGORITHM_KEY_TYPE = OPENSSL_KEYTYPE_RSA; const RSA_ALGORITHM_SIGN = OPENSSL_ALGO_SHA256; protected $public_key; protected $private_key; protected $key_len; public function __construct($pub_key, $pri_key = null) { $this->public_key = $pub_key; $this->private_key = $pri_key; $pub_id = openssl_get_publickey($this->public_key); $this->key_len = openssl_pkey_get_details($pub_id)['bits']; } /* * 创建密钥对 */ public static function createKeys($key_size = 2048) { $config = array( "private_key_bits" => $key_size, "private_key_type" => self::RSA_ALGORITHM_KEY_TYPE, ); $res = openssl_pkey_new($config); openssl_pkey_export($res, $private_key); $public_key_detail = openssl_pkey_get_details($res); $public_key = $public_key_detail["key"]; return [ "public_key" => $public_key, "private_key" => $private_key, ]; } /* * 公钥加密 */ public function publicEncrypt($data) { $encrypted = ''; $part_len = $this->key_len / 8 - 11; $parts = str_split($data, $part_len); foreach ($parts as $part) { $encrypted_temp = ''; openssl_public_encrypt($part, $encrypted_temp, $this->public_key); $encrypted .= $encrypted_temp; } return $this->url_safe_base64_encode($encrypted); } /* * 私钥解密 */ public function privateDecrypt($encrypted) { $decrypted = ""; $part_len = $this->key_len / 8; $base64_decoded = url_safe_base64_decode($encrypted); $parts = str_split($base64_decoded, $part_len); foreach ($parts as $part) { $decrypted_temp = ''; openssl_private_decrypt($part, $decrypted_temp,$this->private_key); $decrypted .= $decrypted_temp; } return $decrypted; } /* * 私钥加密 */ public function privateEncrypt($data) { $encrypted = ''; $part_len = $this->key_len / 8 - 11; $parts = str_split($data, $part_len); foreach ($parts as $part) { $encrypted_temp = ''; openssl_private_encrypt($part, $encrypted_temp, $this->private_key); $encrypted .= $encrypted_temp; } return $this->url_safe_base64_encode($encrypted); } /* * 公钥解密 */ public function publicDecrypt($encrypted) { $decrypted = ""; $part_len = $this->key_len / 8; $base64_decoded = url_safe_base64_decode($encrypted); $parts = str_split($base64_decoded, $part_len); foreach ($parts as $part) { $decrypted_temp = ''; openssl_public_decrypt($part, $decrypted_temp,$this->public_key); $decrypted .= $decrypted_temp; } return $decrypted; } /* * 数据签名 */ public function sign($data) { openssl_sign($data, $sign, $this->private_key, self::RSA_ALGORITHM_SIGN); return $this->url_safe_base64_encode($sign); } /* * 数据签名验证 */ public function verify($data, $sign) { $pub_id = openssl_get_publickey($this->public_key);
//如果$data没有进行base64,请进行 base64后再验证 $res = openssl_verify($data, $this->url_safe_base64_decode($sign), $pub_id, self::RSA_ALGORITHM_SIGN); return $res; } /* * base64_encode处理特殊字符（也有可能不需要替换，直接base64） */ public function url_safe_base64_encode ($data) { return str_replace(array('+','/', '='),array('-','_', ''), base64_encode($data)); } /* * base64_decode处理特殊字符(也有可能不需要，直接base64) */ public function url_safe_base64_decode ($data) { $base_64 = str_replace(array('-','_'),array('+','/'), $data); return base64_decode($base_64); } } ?>
二、AES加密
AES加密算法原理自行百度或者：参考链接
mcrypt模块也可以实现：参考链接
php的openssl模块实现aes加密，比较简单
<?php
/*
* AES加密 */ class Aes { /** *var string $method 加解密方法，可通过openssl_get_cipher_methods()获得
*/
private $method; /** * var string $secret_key 加解密的密钥 */ private $secret_key; /** * var string $iv 密初始化向量,加解密的向量，有些方法需要设置 */ private $iv; /** * var string $options false-原始数据；true-base64后的数据 */ private $options; /** * 构造函数 * * @param string $key 密钥 * @param string $method 加密方式 * @param string $iv iv向量 * @param mixed $options false-原始数据；true-base64后的数据 * */ public function __construct() { $this->secret_key = 'xxxxxxxxxx'; //自己的秘钥 $this->method = 'AES-128-CBC'; $this->iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($this->method)); $this->options = false; } /** * 加密方法，对数据进行加密，返回加密后的数据 * * @param string $data 要加密的数据 * * @return string * */ public function encrypt($data) { $encrypted = openssl_encrypt($data, $this->method, $this->secret_key, $this->options, $this->iv); return base64_encode($encrypted . '::' . $this->iv); } /** * 解密方法，对数据进行解密，返回解密后的数据 * * @param string $data 要解密的数据 * * @return string * */ public function decrypt($data) { $arr = explode('::', base64_decode($data)); $encrypted_data = $arr[0]; $iv = $arr[1]; return openssl_decrypt($encrypted_data, $this->method, $this->secret_key, $this->options, $iv); } }