AES 加解密

//
//  NSData+AES.h
//  Smile
//
//  Created by 蒲晓涛 on 12-11-24.
//  Copyright (c) 2012年 BOX. All rights reserved.
//

// 版权属于原作者
// http://code4app.com (cn) http://code4app.net (en)
// 发布代码于最专业的源码分享网站: Code4App.com

#import <Foundation/Foundation.h>

@class NSString;

@interface NSData (Encryption)

- (NSData *)AES128EncryptWithKey:(NSString *)key;   //加密
- (NSData *)AES128DecryptWithKey:(NSString *)key;   //解密

@end

//
//  NSData+AES.h
//  Smile
//
//  Created by 蒲晓涛 on 12-11-24.
//  Copyright (c) 2012年 BOX. All rights reserved.
//

// 版权属于原作者
// http://code4app.com (cn) http://code4app.net (en)
// 发布代码于最专业的源码分享网站: Code4App.com

#import "NSData+AES.h"
#import <CommonCrypto/CommonCryptor.h>

#define gIv          @"205681D89D731A8F" //可以自行修改

@implementation NSData (Encryption)

//(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+];
    bzero(keyPtr, sizeof(keyPtr));
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    char ivPtr[kCCKeySizeAES128+];
    memset(ivPtr, , 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 = ;

    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+];
    bzero(keyPtr, sizeof(keyPtr));
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    char ivPtr[kCCKeySizeAES128+];
    memset(ivPtr, , 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 = ;
    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

//
//  SecurityUtil.h
//  Smile
//
//  Created by 蒲晓涛 on 12-11-24.
//  Copyright (c) 2012年 BOX. All rights reserved.
//

// 版权属于原作者
// http://code4app.com (cn) http://code4app.net (en)
// 发布代码于最专业的源码分享网站: Code4App.com

#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转成带密码的data
//加密后16进制输出
+(NSString*)encryptAESDataToHexString:(NSString*)string app_key:(NSString*)key ;

//加密后base64输出
+(NSString*)encryptAESDataToBase64:(NSString*)string app_key:(NSString*)key;

//将带密码的data转成string
//解密base64
+(NSString*)decryptAESStringFromBase64:(NSString *)string  app_key:(NSString*)key;

//解密16进制
+(NSString*)decryptAESStringFromHexString:(NSString *)string  app_key:(NSString*)key;

@end

//
//  SecurityUtil.h
//  Smile
//
//  Created by 蒲晓涛 on 12-11-24.
//  Copyright (c) 2012年 BOX. All rights reserved.
//

// 版权属于原作者
// http://code4app.com (cn) http://code4app.net (en)
// 发布代码于最专业的源码分享网站: Code4App.com

#import "SecurityUtil.h"
#import "GTMBase64.h"
#import "NSData+AES.h"

#define C2I(c) ((c >= '0' && c<='9') ? (c-'0') : ((c >= 'a' && c <= 'z') ? (c - 'a' + 10): ((c >= 'A' && c <= 'Z')?(c - 'A' + 10):(-1))))
@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];
    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];
    return base64String;
} 

+ (NSString*)encodeBase64Data:(NSData *)data {
    data = [GTMBase64 encodeData:data];
    NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    return base64String;
}

+ (NSString*)decodeBase64Data:(NSData *)data {
    data = [GTMBase64 decodeData:data];
    NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    return base64String;
}

#pragma mark - AES加密
//将string转成带密码的data
+(NSString*)encryptAESDataToHexString:(NSString*)string app_key:(NSString*)key
{
    //将nsstring转化为nsdata
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    NSData *encryptedData = [data AES128EncryptWithKey:key];
    Byte *bytes = (Byte *)[encryptedData bytes];
    NSLog(@"%@", encryptedData);
    //下面是Byte 转换为16进制。
    NSString *hexStr=@"";
    for(int i=;i<[encryptedData length];i++)

    {
        NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数

        if([newHexStr length]==)

            hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];

        else

            hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
    }
    NSLog(@"%@", hexStr);
    NSLog(@"%@", hexStr.uppercaseString);
    return hexStr.uppercaseString;
}

+(NSString*)encryptAESDataToBase64:(NSString*)string app_key:(NSString*)key
{
    //将nsstring转化为nsdata
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    NSData *encryptedData = [data AES128EncryptWithKey:key];
    Byte *bytes = (Byte *)[encryptedData bytes];
    NSLog(@"%@", encryptedData);
    NSLog(@"加密后的字符串 :%@",[encryptedData base64Encoding]);

    return [encryptedData base64Encoding];
}

#pragma mark - 转16进制
-(NSString *)hexStringFromData:(NSData *)data{
    Byte *bytes = (Byte *)[data bytes];
    //下面是Byte 转换为16进制。
    NSString *hexStr=@"";
    for(int i=;i<[data length];i++)

    {
        NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数

        if([newHexStr length]==)

            hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];

        else

            hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
    }
    return hexStr;
}

#pragma mark - 16进制转data
-(NSData *)convert:(NSString *)str

{

    const char* cs = str.UTF8String;

    int count = strlen(cs);

    int8_t bytes[count / ];

    for(int i = ; i<count; i+=)
    {
        char c1 = *(cs + i);
        char c2 = *(cs + i + );
        if(C2I(c1) >=  && C2I(c2) >= ){
            bytes[i / ] = C2I(c1) *  + C2I(c2);
        }else{
            return nil;
        }
    }
    return [NSData dataWithBytes:bytes length:count / ];
}

#pragma mark - AES解密
//将带密码的data转成string
+(NSString*)decryptAESStringFromBase64:(NSString *)string  app_key:(NSString*)key
{
    NSData *EncryptData = [GTMBase64 decodeString:string]; //解密前进行GTMBase64编码
    //使用密码对data进行解密
    NSData *decryData = [EncryptData AES128DecryptWithKey:key];
    //将解了密码的nsdata转化为nsstring
    NSString *str = [[NSString alloc] initWithData:decryData encoding:NSUTF8StringEncoding];
    return str;
}
//--------------------------------------------------------
+(NSString*)decryptAESStringFromHexString:(NSString *)string  app_key:(NSString*)key
{
    //16进制转data
    const char* cs = string.UTF8String;

    int count = strlen(cs);

    int8_t bytes[count / ];

    for(int i = ; i<count; i+=)
    {
        char c1 = *(cs + i);
        char c2 = *(cs + i + );
        if(C2I(c1) >=  && C2I(c2) >= ){
            bytes[i / ] = C2I(c1) *  + C2I(c2);
        }else{
            return nil;
        }
    }
    NSData * newData = [NSData dataWithBytes:bytes length:count / ];
    NSLog(@"%@", newData);
    //NSData *EncryptData = [GTMBase64 decodeString:string]; //解密前进行GTMBase64编码
    //使用密码对data进行解密
    NSData *decryData = [newData AES128DecryptWithKey:key];
    //将解了密码的nsdata转化为nsstring
    NSString *str = [[NSString alloc] initWithData:decryData encoding:NSUTF8StringEncoding];
    return str;
}

@end