这个网上的资料真实浩如烟海，但是真正有价值的屈指可数
自己尝试了一天多，终于还是搞定了。
再次要感谢网上的前辈么。
比如下面这个关于php和java端的实现：
关于php和java端的实现。
再比如下面这个关于ios端的实现：
为何要采用 no padding 这种形式：
AES加密如果原输入数据不够16字节的整数位，就要补齐，如果采用
pkcs7或者pkcs5这种加密方式，末端添加的数据可能是0x1,0x2,0x3，不固定，，
在解码后需要把末端多余的字符去掉，就显得比较棘手。
如果不管补齐多少位，末端都是’\0′,去掉的话比较容易操作。
好了，再次确认一下，这里使用的是 AES128 CBC no padding加密解密方式。
先上ios端的代码：
<pre class="objc" name="code">//// AES128.m// login//// Created by wangdan on 15-3-3.// Copyright (c) 2015年 wangdan. All rights reserved.//#import "AES128.h"#import <CommonCrypto/CommonCryptor.h>#import "GTMBase64.h"@implementation AES128+(NSString *)AES128Encrypt:(NSString *)plainText withKey:(NSString *)key{if( ![self validKey:key] ){return nil;}char keyPtr[kCCKeySizeAES128+1];memset(keyPtr, 0, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];char ivPtr[kCCBlockSizeAES128+1];memset(ivPtr, 0, sizeof(ivPtr));[key getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];NSUInteger dataLength = [data length];int diff = kCCKeySizeAES128 – (dataLength % kCCKeySizeAES128);unsigned long newSize = 0;if(diff > 0){newSize = dataLength + diff;NSLog(@"diff is %d",diff);}char dataPtr[newSize];memcpy(dataPtr, [data bytes], [data length]);for(int i = 0; i < diff; i++){dataPtr[i + dataLength] =0x0000;}size_t bufferSize = newSize + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);memset(buffer, 0, bufferSize);size_t numBytesCrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,kCCAlgorithmAES128,0x0000,[key UTF8String],kCCKeySizeAES128,[key UTF8String],dataPtr,sizeof(dataPtr),buffer,bufferSize,&numBytesCrypted);if (cryptStatus == kCCSuccess) {NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesCrypted];return [GTMBase64 stringByEncodingData:resultData];}free(buffer);return nil;}+(NSString *)processDecodedString:(NSString *)decoded{if( decoded==nil || decoded.length==0 ){return nil;}const char *tmpStr=[decoded UTF8String];int i=0;while( tmpStr[i]!='\0' ){i++;}NSString *final=[[NSString alloc]initWithBytes:tmpStr length:i encoding:NSUTF8StringEncoding];return final;}+(NSString *)AES128Decrypt:(NSString *)encryptText withKey:(NSString *)key{if( ![self validKey:key] ){return nil;}char keyPtr[kCCKeySizeAES128 + 1];memset(keyPtr, 0, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];char ivPtr[kCCBlockSizeAES128 + 1];memset(ivPtr, 0, sizeof(ivPtr));[key getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];NSData *data = [GTMBase64 decodeData:[encryptText dataUsingEncoding:NSUTF8StringEncoding]];NSUInteger dataLength = [data length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesCrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,kCCAlgorithmAES128,0x0000,[key UTF8String],kCCBlockSizeAES128,[key UTF8String],[data bytes],dataLength,buffer,bufferSize,&numBytesCrypted);if (cryptStatus == kCCSuccess) {NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesCrypted];NSString *decoded=[[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];return [self processDecodedString:decoded];}free(buffer);return nil;}+(BOOL)validKey:(NSString*)key{if( key==nil || key.length !=16 ){return NO;}return YES;}-(NSString *)processDecodedString:(NSString *)decoded{if( decoded==nil || decoded.length==0 ){return nil;}const char *tmpStr=[decoded UTF8String];int i=0;while( tmpStr[i]!='\0' ){i++;}NSString *final=[[NSString alloc]initWithBytes:tmpStr length:i encoding:NSUTF8StringEncoding];return final;}@end
上述代码需要说明的是，进行AES编码时，输入编码必须是16字节的整数倍，不然调用ios 的系统api会报错 -4003
补齐的字节数全部填充为0
另外 processDecodedString这个函数为了把解码后的字符串，末尾去掉’\0′
下面是PHP端的代码，这个代码是大神些写的啊，经过实际实验是能使用的：
<?php$privateKey = "1234567812345678";$iv= "1234567812345678";$data = "Test String"; //加密$encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $privateKey, $data, MCRYPT_MODE_CBC, $iv);echo(base64_encode($encrypted));echo '<br/>'; //解密$encryptedData = base64_decode("2fbwW9+8vPId2/foafZq6Q==");$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $privateKey, $encryptedData, MCRYPT_MODE_CBC, $iv);echo($decrypted);?>
接受失败也等于给了自己从零开始的机会，接受失败更是一种智者的宣言和呐喊;
