新增一个NSString的分类Category
.h代码如下:
#import <Foundation/Foundation.h>
@interface NSString (MD5)
/**
* md5加密的字符串
*
* @param str
*
* @return
*/
+ (NSString *)md5:(NSString *) str;
@end
.m文件代码如下:
#import "NSString+MD5.h"
#import <CommonCrypto/CommonDigest.h>
@implementation NSString (MD5)
+ (NSString *)md5:(NSString *) str
{
const char *cStr = [str UTF8String];
unsigned char result[16];
CC_MD5(cStr, strlen(cStr), result); // This is the md5 call
return [NSString stringWithFormat:
@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
result[0], result[1], result[2], result[3],
result[4], result[5], result[6], result[7],
result[8], result[9], result[10], result[11],
result[12], result[13], result[14], result[15]
];
}
@end