iOS des加密转码16进制字符串

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转载自:https://yq.aliyun.com/articles/31342#comment

NSString+DES.h

////  NSString+DES.h//  haochang////  Created by Administrator on 14-4-15.//  Copyright (c) 2014年 Administrator. All rights reserved.//#import <Foundation/Foundation.h>@interface NSString (DES)//加密+(NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key;//解密+(NSString *) decryptUseDES:(NSString *)plainText key:(NSString *)key;@end

NSString+DES.m

////  NSString+DES.m//  haochang////  Created by Administrator on 14-4-15.//  Copyright (c) 2014年 Administrator. All rights reserved.//#import "NSString+DES.h"#import <CommonCrypto/CommonCrypto.h>@implementation NSString (DES)//加密+(NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key;{    NSString *ciphertext = nil;    const char *textBytes = [plainText UTF8String];    NSUInteger dataLength = [plainText length];    unsigned char buffer[1024];    memset(buffer, 0, sizeof(char));    size_t numBytesEncrypted = 0;    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,                                          kCCOptionPKCS7Padding,                                          [key UTF8String], kCCKeySizeDES,                                          NULL,                                          textBytes, dataLength,                                          buffer, 1024,                                          &numBytesEncrypted);    if (cryptStatus == kCCSuccess) {        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];        ciphertext = [self dataTohexString:data];    }        return ciphertext;}//解密+(NSString *) decryptUseDES:(NSString *)plainText key:(NSString *)key{    NSString *cleartext = nil;    NSData *textData = [self hexStringToData:plainText];    NSUInteger dataLength = [textData length];    unsigned char buffer[1024];    memset(buffer, 0, sizeof(char));    size_t numBytesEncrypted = 0;        CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES,kCCOptionPKCS7Padding,                                          [key UTF8String], kCCKeySizeDES,                                          NULL,                                          [textData bytes]  , dataLength,                                          buffer, 1024,                                          &numBytesEncrypted);    if (cryptStatus == kCCSuccess) {        //NSLog(@"DES解密成功");        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];        cleartext = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];    }else{        //NSLog(@"DES解密失败");    }    return cleartext;}+ (NSString *)dataTohexString:(NSData*)data{    Byte *bytes = (Byte *)[data bytes];    NSString *hexStr=@"";    for(int i=0;i<[data length];i++)    {        NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];//16进制数        if([newHexStr length]==1)            hexStr = [NSString  stringWithFormat:@"%@0%@",hexStr,newHexStr];        else            hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];    }    return hexStr;}+ (NSData*)hexStringToData:(NSString*)hexString{    //NSString *hexString = @"3e435fab9c34891f"; //16进制字符串    int j=0;    Byte bytes[hexString.length];  ///3ds key的Byte 数组， 128位    for(int i=0;i<[hexString length];i++)    {        int int_ch;  /// 两位16进制数转化后的10进制数                unichar hex_char1 = [hexString characterAtIndex:i]; ////两位16进制数中的第一位(高位*16)        int int_ch1;        if(hex_char1 >= '0' && hex_char1 <='9')            int_ch1 = (hex_char1-48)*16;   //// 0 的Ascll - 48        else if(hex_char1 >= 'A' && hex_char1 <='F')            int_ch1 = (hex_char1-55)*16; //// A 的Ascll - 65        else            int_ch1 = (hex_char1-87)*16; //// a 的Ascll - 97        i++;                unichar hex_char2 = [hexString characterAtIndex:i]; ///两位16进制数中的第二位(低位)        int int_ch2;        if(hex_char2 >= '0' && hex_char2 <='9')            int_ch2 = (hex_char2-48); //// 0 的Ascll - 48        else if(hex_char1 >= 'A' && hex_char1 <='F')            int_ch2 = hex_char2-55; //// A 的Ascll - 65        else            int_ch2 = hex_char2-87; //// a 的Ascll - 97                int_ch = int_ch1+int_ch2;        //NSLog(@"int_ch=%x",int_ch);        bytes[j] = int_ch;  ///将转化后的数放入Byte数组里        j++;    }    //    NSData *newData = [[NSData alloc] initWithBytes:bytes length:j];    NSData *newData = [[NSData alloc] initWithBytes:bytes length:j];    //NSLog(@"newData=%@",newData);    return newData;}@end

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