IOS MD5

#import "NSString+XXMD5.h"

#import

@implementation NSString (XXMD5)

- (NSString *)xx_md5

{

    if (!self ||self.length ==0) {

        return nil;

    }

    

    const char *cStr = [selfUTF8String];

    unsigned char result[16];

    CC_MD5(cStr, (unsignedint)strlen(cStr), result);// This is the md5 call

    return [NSStringstringWithFormat:

            @"%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]

            ];

}

简化版

+ (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
        [ret appendFormat:@"%02X",result];
    }    
    return ret;
}