CODEWITHSUNDEEP
objective-cmacosencryptionnsstringpasswords
atomikpanda
atomikpanda

Reputation: 1886

encode password objective-c mac

How can I encode a password string and save it to a file in objective-c on a Mac? something like this:

NSString *myPasswordString = [NSString stringWithFormat:@"mypassword"];

//Encode

//Save to Preferences file

Upvotes: 0

Views: 1233

Answers (3)

Abizern
Abizern

Reputation: 150605

A better way to store passwords would be to use the Keychain.

There are classes that make it easier - such as SSKeyChain on Github

Upvotes: 2

John Carter
John Carter

Reputation: 6985

You can write to a preferences file as follows:

NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[settings setObject : myPasswordString forKey : @"mypassword"];
[settings synchronize];

I'm not sure what you mean by 'encode'. If you mean 'encrypt' there are numerous questions on SO:

Even with the above, you'll still need to think carefully about the security implications. If you're storing a password that was encrypted using a key embedded in your application its possible for that password to be recovered by an attacker.

Upvotes: 0

sunkehappy
sunkehappy

Reputation: 9091

#import <CommonCrypto/CommonDigest.h>
...
const char *cStr = [myPasswordString UTF8String];
unsigned char result[16];
CC_MD5( cStr, strlen(cStr), result ); // This is the md5 call
NSString *passwordAfterEncrypt = [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]];

Upvotes: 1

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