【IOS】dataToHexString与hexStringToData

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////  NSData+DataToHexString.h//  TestDES////  Created by coooliang on 15/12/28.//  Copyright © 2015年 coooliang. All rights reserved.//#import <Foundation/Foundation.h>@interface NSData (DataToHexString)-(NSString *)dataToHexString;@end

////  NSData+DataToHexString.m//  TestDES////  Created by coooliang on 15/12/28.//  Copyright © 2015年 coooliang. All rights reserved.//#import "NSData+DataToHexString.h"@implementation NSData (DataToHexString)-(NSString *)dataToHexString{    NSUInteger len = [self length];    char *chars = (char *)[self bytes];    NSMutableString *hexString = [[NSMutableString alloc]init];    for (NSUInteger i=0; i<len; i++) {        [hexString appendString:[NSString stringWithFormat:@"%0.2hhx",chars[i]]];    }    return hexString;}@end

hexString to NSData

+(NSData *)hexStringToData:(NSString *)hexString{    const char *chars = [hexString UTF8String];    int i = 0;    int len = (int)hexString.length;    NSMutableData *data = [NSMutableData dataWithCapacity:len/2];    char byteChars[3] = {'\0','\0','\0'};    unsigned long wholeByte;        while (i<len) {        byteChars[0] = chars[i++];        byteChars[1] = chars[i++];        wholeByte = strtoul(byteChars, NULL, 16);        [data appendBytes:&wholeByte length:1];    }    return data;}

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