How do I create an MD5 Hash of a string in Cocoa?

Question

I know SHA-1 is preferred, but this project requires I use MD5.

#include 

- (NSString*) MD5Hasher: (NSString*) query {
    NSData* hash         


        

Answer 1

These answers are correct but confusing. I post a working sample, since I had issues with most other answers. The code is tested and works well for Mac OS X 10.12.x and iOS 10.1.x.

YourClass.h

#import 
@interface YourClass : NSObject
+ (NSString *) md5:(NSString *) input;
@end

YourClass.m

#import YourClass.h

+ (NSString *) md5:(NSString *) input
{
    const char *cStr = [input UTF8String];
    unsigned char digest[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cStr, (uint32_t)strlen(cStr), digest);
    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)
        [output appendFormat:@"%02x", digest[i]]; //%02X for capital letters
    return output;
}

Usage (e.g. in some other class):

SomeOtherClass.h

#import "YourClass.h"

SomeOtherClass.m

-(void) Test
{
    //call by [self Test] or use somewhere in your code.
    NSString *password = @"mypassword123";
    NSString *md5 = [YourClass md5:password];
    NSLog(@"%@", password);
    NSLog(@"%@", md5);
}