//

//  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