IOS AES 128 ECB PKCS7Padding 16进制加密解密

 //////////////AES加密方式： AES 128 ECB PKCS7Padding 16进制加密解密  //////////////
     NSString *originalStr=@"AES";

     //加密
     NSString *encryStr = [AES128Util AES128Encrypt:originalStr key:AES_KEY];
     //解密
     NSString *decryStr = [AES128Util AES128Decrypt:encryStr key:AES_KEY];

     NSLog(@"\n加密前：%@\n加密后：%@ \n解密后：%@",originalStr,encryStr,decryStr);

 //
 //  AES128Util.h
 //  ASE128Demo
 //
 //  Created by zhenghaishu on 11/11/13.
 //  Copyright (c) 2013 Youku.com inc. All rights reserved.
 //

 #import

 @interface AES128Util : NSObject

 +(NSString *)AES128Encrypt:(NSString *)plainText key:(NSString *)key;

 +(NSString *)AES128Decrypt:(NSString *)encryptText key:(NSString *)key;

 @end

 //
 //  AES128Util.m
 //  ASE128Demo
 //
 //  Created by zhenghaishu on 11/11/13.
 //  Copyright (c) 2013 Youku.com inc. All rights reserved.
 //

 #import "AES128Util.h"
 #import
 #import "GTMBase64.h"

 @implementation AES128Util

 +(NSString *)AES128Encrypt:(NSString *)plainText key:(NSString *)key
 {
     char keyPtr[kCCKeySizeAES128+1];
     memset(keyPtr, 0, sizeof(keyPtr));
     [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

     NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];
     NSUInteger dataLength = [data length];

     size_t bufferSize = dataLength + kCCBlockSizeAES128;
     voidvoid *buffer = malloc(bufferSize);
     size_t numBytesEncrypted = 0;
     CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                           kCCAlgorithmAES128,
                                           kCCOptionPKCS7Padding|kCCOptionECBMode,
                                           keyPtr,
                                           kCCBlockSizeAES128,
                                           NULL,
                                           [data bytes],
                                           dataLength,
                                           buffer,
                                           bufferSize,
                                           &numBytesEncrypted);
     if (cryptStatus == kCCSuccess) {
         NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
         //return [GTMBase64 stringByEncodingData:resultData];
         return [self hexStringFromData:resultData];

     }
     free(buffer);
     return nil;
 }


 +(NSString *)AES128Decrypt:(NSString *)encryptText key:(NSString *)key
 {
     char keyPtr[kCCKeySizeAES128 + 1];
     memset(keyPtr, 0, sizeof(keyPtr));
     [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

     //NSData *data = [GTMBase64 decodeData:[encryptText dataUsingEncoding:NSUTF8StringEncoding]];

     NSData *data=[self dataForHexString:encryptText];

     NSUInteger dataLength = [data length];
     size_t bufferSize = dataLength + kCCBlockSizeAES128;
     voidvoid *buffer = malloc(bufferSize);

     size_t numBytesCrypted = 0;
     CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                           kCCAlgorithmAES128,
                                           kCCOptionPKCS7Padding|kCCOptionECBMode,
                                           keyPtr,
                                           kCCBlockSizeAES128,
                                           NULL,
                                           [data bytes],
                                           dataLength,
                                           buffer,
                                           bufferSize,
                                           &numBytesCrypted);
     if (cryptStatus == kCCSuccess) {
         NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesCrypted];
         return [[[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding] autorelease];
     }
     free(buffer);
     return nil;
 }

 // 普通字符串转换为十六进
 + (NSString *)hexStringFromData:(NSData *)data {
     Byte *bytes = (Byte *)[data bytes];
     // 下面是Byte 转换为16进制。
     NSString *hexStr = @"";
     for(int i=0; i<[data length]; i++) {
         NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i] & 0xff]; //16进制数
         newHexStr = [newHexStr uppercaseString];

         if([newHexStr length] == 1) {
             newHexStr = [NSString stringWithFormat:@"0%@",newHexStr];
         }

         hexStr = [hexStr stringByAppendingString:newHexStr];

     }
     return hexStr;
 }

 //参考：http://blog.csdn.net/linux_zkf/article/details/17124577
 //十六进制转Data
 + (NSData*)dataForHexString:(NSString*)hexString
 {
     if (hexString == nil) {

         return nil;
     }

     const char* ch = [[hexString lowercaseString] cStringUsingEncoding:NSUTF8StringEncoding];
     NSMutableData* data = [NSMutableData data];
     while (*ch) {
         if (*ch == ' ') {
             continue;
         }
         char byte = 0;
         if ('0' <= *ch && *ch <= '9') {

             byte = *ch - '0';
         }else if ('a' <= *ch && *ch <= 'f') {

             byte = *ch - 'a' + 10;
         }else if ('A' <= *ch && *ch <= 'F') {

             byte = *ch - 'A' + 10;

         }

         ch++;

         byte = byte << 4;

         if (*ch) {

             if ('0' <= *ch && *ch <= '9') {

                 byte += *ch - '0';

             } else if ('a' <= *ch && *ch <= 'f') {

                 byte += *ch - 'a' + 10;

             }else if('A' <= *ch && *ch <= 'F'){

                 byte += *ch - 'A' + 10;

             }

             ch++;

         }

         [data appendBytes:&byte length:1];

     }

     return data;
 }

 @end

AES在线加密工具

http://www.seacha.com/tools/aes.html?src=wenhan123455678888050i33i206279278&mode=ECB&keylen=128&key=1234567890123456&iv=1234567890123456&bpkcs=pkcs7padding&session=FH4xlZr0LlqsJVtwfbVw&aes=ac518f9f8429369bf129da6d6633cbb2&encoding=hex&type=0

参考工程：https://github.com/zhenghaishu/AES128-for-iOS

http://pan.baidu.com/s/1jHmo9Pc