MD5

#import "MD5Hex.h"

#import <CommonCrypto/CommonDigest.h>

@implementation MD5Hex (CCCryptUtil)

//MD5只能稱爲一種不可逆的消息摘要算法，只能用做一些檢驗過程，不能恢復其原文

+ (NSString *)md5HexDigest:(NSString*)input

{

    const char* str = [input UTF8String];

    unsigned char result[CC_MD5_DIGEST_LENGTH];

    CC_MD5(str, strlen(str), result);

    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH];

    

    for(int i = 0; i<CC_MD5_DIGEST_LENGTH; i++) {

        [ret appendFormat:@"%02X",result[i]];

    }

    return ret;

}

@end