使用原因：

因為在項目中，需要在與客戶端(IOS,Android)交互的時候，保存一些私有信息，不被別人看到，所以，使用了比較流行的可以反向加解密的AES。

PHP 源碼

<?php$aes = new aes; echo $aes->aes128cbcEncrypt("11122222"); echo "\n"; echo $aes->aes128cbcEncrypt("中文aes演示"); echo "\n"; class aes{const KEY="625202f9149e061d";const IV ="5efd3f6060e20330";/*** pkcs7補碼* @param string $string 明文* @param int $blocksize Blocksize , 以 byte 為單位* @return String*/ private function addPkcs7Padding($string, $blocksize = 32) {$len = strlen($string); //取得字符串長度$pad = $blocksize - ($len % $blocksize); //取得補碼的長度$string .= str_repeat(chr($pad), $pad); //用ASCII碼為補碼長度的字符， 補足最后一段return $string;}/*** 加密然后base64轉碼* * @param String 明文* @param 加密的初始向量（IV的長度必須和Blocksize一樣， 且加密和解密一定要用相同的IV）* @param $key 密鑰*/function aes256cbcEncrypt($str, $iv, $key ) { return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $this->addPkcs7Padding($str) , MCRYPT_MODE_CBC, $iv));}/*** 除去pkcs7 padding* * @param String 解密后的結果* * @return String*/private function stripPkcs7Padding($string){$slast = ord(substr($string, -1));$slastc = chr($slast);$pcheck = substr($string, -$slast);if(preg_match("/$slastc{".$slast."}/", $string)){$string = substr($string, 0, strlen($string)-$slast);return $string;} else {return false;}}/*** 解密* * @param String $encryptedText 二進制的密文 * @param String $iv 加密時候的IV* @param String $key 密鑰* @return String*/function aes256cbcDecrypt($encryptedText, $iv, $key) {$encryptedText =base64_decode($encryptedText);return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $encryptedText, MCRYPT_MODE_CBC, $iv));}function aes128cbcDecrypt($encryptedText, $iv=self::IV, $key=self::KEY) {$encryptedText =base64_decode($encryptedText);return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encryptedText, MCRYPT_MODE_CBC, $iv));}function hexToStr($hex)//十六進制轉字符串{ $string=""; for($i=0;$i<strlen($hex)-1;$i+=2)$string.=chr(hexdec($hex[$i].$hex[$i+1]));return $string;}function strToHex($string)//字符串轉十六進制{ $hex="";$tmp="";for($i=0;$i<strlen($string);$i++){$tmp = dechex(ord($string[$i]));$hex.= strlen($tmp) == 1 ? "0".$tmp : $tmp;}$hex=strtoupper($hex);return $hex;}function aes128cbcHexDecrypt($encryptedText, $iv=self::IV, $key=self::KEY) {$str = $this->hexToStr($encryptedText);return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_CBC, $iv));}function aes128cbcEncrypt($str, $iv=self::IV, $key=self::KEY ) { // $this->addPkcs7Padding($str,16)$base = (mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key,$this->addPkcs7Padding($str,16) , MCRYPT_MODE_CBC, $iv));return $this->strToHex($base);} }

運行結果

在線驗證加解密結果

驗證地址
http://www.seacha.com/tools/aes.html

IOS 源碼

@implementation NSString (AES256) -(NSString *) aes256_encrypt:(NSString *)key {const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];NSData *data = [NSData dataWithBytes:cstr length:self.length];//對數據進行加密NSData *result = [data aes256_encrypt:key];//轉換為2進制字符串if (result && result.length > 0) {Byte *datas = (Byte*)[result bytes];NSMutableString *output = [NSMutableString stringWithCapacity:result.length * 2];for(int i = 0; i < result.length; i++){[output appendFormat:@"%02x", datas[i]];}return output;}return nil; }-(NSString *) aes256_decrypt:(NSString *)key {//轉換為2進制DataNSMutableData *data = [NSMutableData dataWithCapacity:self.length / 2];unsigned char whole_byte;char byte_chars[3] = {'\0','\0','\0'};int i;for (i=0; i < [self length] / 2; i++) {byte_chars[0] = [self characterAtIndex:i*2];byte_chars[1] = [self characterAtIndex:i*2+1];whole_byte = strtol(byte_chars, NULL, 16);[data appendBytes:&whole_byte length:1];}//對數據進行解密NSData* result = [data aes256_decrypt:key];if (result && result.length > 0) {return [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];}return nil; } @end@implementation NSData (AES256)- (NSData *)aes256_encrypt:(NSString *)key //加密 {char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength = [self length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesEncrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding ,keyPtr, kCCBlockSizeAES128,[AES_IV UTF8String],[self bytes], dataLength,buffer, bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];}free(buffer);return nil; }- (NSData *)aes256_decrypt:(NSString *)key //解密 {char keyPtr[kCCKeySizeAES256+1];bzero(keyPtr, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];NSUInteger dataLength = [self length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesDecrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,kCCOptionPKCS7Padding ,keyPtr, kCCBlockSizeAES128,[AES_IV UTF8String],[self bytes], dataLength,buffer, bufferSize,&numBytesDecrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];}free(buffer);return nil; }@end

Android

package com.example.aes;import java.io.UnsupportedEncodingException;import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec;/*** AES加密解密算法*/ public class AesEncryptionUtil { /** 算法/模式/填充 **/ private static final String CipherMode = "AES/CBC/PKCS5Padding"; /** 創建密鑰 **/ private static SecretKeySpec createKey(String key) { byte[] data = null; if (key == null) { key = ""; } StringBuffer sb = new StringBuffer(16); sb.append(key); while (sb.length() < 16) { sb.append("0"); } if (sb.length() > 16) { sb.setLength(16); } try { data = sb.toString().getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new SecretKeySpec(data, "AES"); } private static IvParameterSpec createIV(String password) { byte[] data = null; if (password == null) { password = ""; } StringBuffer sb = new StringBuffer(16); sb.append(password); while (sb.length() < 16) { sb.append("0"); } if (sb.length() > 16) { sb.setLength(16); } try { data = sb.toString().getBytes("UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new IvParameterSpec(data); } /** 加密字節數據 **/ public static byte[] encrypt(byte[] content, String password, String iv) { try { SecretKeySpec key = createKey(password); Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.ENCRYPT_MODE, key, createIV(iv)); byte[] result = cipher.doFinal(content); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** 加密(結果為16進制字符串) **/ public static String encrypt(String content, String password, String iv) { byte[] data = null; try { data = content.getBytes("UTF-8"); } catch (Exception e) { e.printStackTrace(); } data = encrypt(data, password, iv); String result = byte2hex(data); return result; } /** 解密字節數組 **/ public static byte[] decrypt(byte[] content, String password, String iv) { try { SecretKeySpec key = createKey(password); Cipher cipher = Cipher.getInstance(CipherMode); cipher.init(Cipher.DECRYPT_MODE, key, createIV(iv)); byte[] result = cipher.doFinal(content); return result; } catch (Exception e) { e.printStackTrace(); } return null; } /** 解密(輸出結果為字符串) **/ public static String decrypt(String content, String password, String iv) { byte[] data = null; try { data = hex2byte(content); } catch (Exception e) { e.printStackTrace(); } data = decrypt(data, password, iv); if (data == null) return null; String result = null; try { result = new String(data, "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return result; } /** 字節數組轉成16進制字符串 **/ public static String byte2hex(byte[] b) { // 一個字節的數， StringBuffer sb = new StringBuffer(b.length * 2); String tmp = ""; for (int n = 0; n < b.length; n++) { // 整數轉成十六進制表示 tmp = (java.lang.Integer.toHexString(b[n] & 0XFF)); if (tmp.length() == 1) { sb.append("0"); } sb.append(tmp); } return sb.toString().toUpperCase(); // 轉成大寫 } /** 將hex字符串轉換成字節數組 **/ private static byte[] hex2byte(String inputString) { if (inputString == null || inputString.length() < 2) { return new byte[0]; } inputString = inputString.toLowerCase(); int l = inputString.length() / 2; byte[] result = new byte[l]; for (int i = 0; i < l; ++i) { String tmp = inputString.substring(2 * i, 2 * i + 2); result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF); } return result; } }

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