Objective-C MD5加密字符串

NSString.h

#define USE_APPLICATION_UNIT_TEST 1

#import <UIKit/UIKit.h>

@interface NSString (NSStringDM5)

+ (NSString *) md5:(NSString *)str;

@end

NSString.m

#import "NSString.h"
#import <CommonCrypto/CommonDigest.h>

@implementation NSString (NSStringDM5)

+ (NSString *) md5:(NSString *)str {
    const char *cStr = [str UTF8String];
    unsigned char result[16];
    CC_MD5( cStr, strlen(cStr), result );
    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