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主要是要得到加密后的原来的字符创，MD5无法得到原有的，仅仅能用AES+base64

要用GTMBase64这个能够自己去下载，

主要看另外2个类文件。

#import <Foundation/Foundation.h>
@class NSString;
@interface NSData (NSData_AES)- (NSData *)AES128EncryptWithKey:(NSString *)key;   //加密
- (NSData *)AES128DecryptWithKey:(NSString *)key;   //解密@end

#import "NSData+NSData_AES.h"
#import <CommonCrypto/CommonCryptor.h>
#define gIv @"xxxxxxxxxxx" //能够自行定义16位@implementation NSData (NSData_AES)
//(key和iv向量这里是16位的) 这里是CBC加密模式，安全性更高- (NSData *)AES128EncryptWithKey:(NSString *)key//加密
{char keyPtr[kCCKeySizeAES128+1];bzero(keyPtr, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];char ivPtr[kCCKeySizeAES128+1];memset(ivPtr, 0, sizeof(ivPtr));[gIv getCString:ivPtr maxLength:sizeof(ivPtr) 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,ivPtr,[self bytes],dataLength,buffer,bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];}free(buffer);return nil;
}- (NSData *)AES128DecryptWithKey:(NSString *)key//解密
{char keyPtr[kCCKeySizeAES128+1];bzero(keyPtr, sizeof(keyPtr));[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];char ivPtr[kCCKeySizeAES128+1];memset(ivPtr, 0, sizeof(ivPtr));[gIv getCString:ivPtr maxLength:sizeof(ivPtr) 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,ivPtr,[self bytes],dataLength,buffer,bufferSize,&numBytesDecrypted);if (cryptStatus == kCCSuccess) {return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];}free(buffer);return nil;
}@end

#import <Foundation/Foundation.h>@interface SecurityUtil : NSObject #pragma mark - base64
+ (NSString*)encodeBase64String:(NSString *)input;
+ (NSString*)decodeBase64String:(NSString *)input;+ (NSString*)encodeBase64Data:(NSData *)data;
+ (NSString*)decodeBase64Data:(NSData *)data;#pragma mark - AES加密
//将string转成带password的data
+ (NSString*)encryptAESData:(NSString*)string app_key:(NSString*)key ;
//将带password的data转成string
+(NSString*)decryptAESData:(NSData*)data app_key:(NSString*)key ;@end

#import "SecurityUtil.h"
#import "GTMBase64.h"
#import "NSData+AES.h"@implementation SecurityUtil#pragma mark - base64
+ (NSString*)encodeBase64String:(NSString * )input { NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES]; data = [GTMBase64 encodeData:data]; NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]; return base64String;
}+ (NSString*)decodeBase64String:(NSString * )input { NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES]; data = [GTMBase64 decodeData:data]; NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]; return base64String;
} + (NSString*)encodeBase64Data:(NSData *)data {data = [GTMBase64 encodeData:data]; NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];return base64String;
}+ (NSString*)decodeBase64Data:(NSData *)data {data = [GTMBase64 decodeData:data]; NSString *base64String = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];return base64String;
}#pragma mark - AES加密
//将string转成带password的data
+(NSString*)encryptAESData:(NSString*)string app_key:(NSString*)key
{//将nsstring转化为nsdataNSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];//使用password对nsdata进行加密NSData *encryptedData = [data AES128EncryptWithKey:key];NSLog(@"加密后的字符串 :%@",[encryptedData base64Encoding]);return [encryptedData base64Encoding];
}#pragma mark - AES解密
//将带password的data转成string
+(NSString*)decryptAESData:(NSData*)data  app_key:(NSString*)key
{//使用password对data进行解密NSData *decryData = [data AES128DecryptWithKey:key];//将解了password的nsdata转化为nsstringNSString *str = [[NSString alloc] initWithData:decryData encoding:NSUTF8StringEncoding];NSLog(@"解密后的字符串 :%@",str);return [str autorelease];
}@end

详细的用法例如以下：

加密：

[SecurityUtilencryptAESData:@"XXXXXX" app_key:KEY]; 这里的是能够自己设置一个16位的字符串

解密：

NSData *EncryptData1 = [GTMBase64decodeString:[SecurityUtil encryptAESData:@"XXXXXX" app_key:KEY]];//解密前进行GTMBase64编码

NSString * string1 = [SecurityUtildecryptAESData:EncryptData1app_key:KEY];