Drupal and Objective C Base 64 mismatch - ios

Question

I have this sequence of bytes (printed from an HTML, so apologizes for the ugly format)
193<br/>250<br/>194<br/>129<br/>62<br/>60<br/>12<br/>171<br/>199<br/>96<br/>13<br/>125<br/>166<br/>175<br/>80<br/>85<br/>137<br/>29<br/>15<br/>189<br/>33<br/>231<br/>237<br/>98<br/>165<br/>35<br/>75<br/>250<br/>181<br/>150<br/>35<br/>175<br/>129<br/>174<br/>13<br/>13<br/>121<br/>229<br/>30<br/>173<br/>112<br/>210<br/>2<br/>165<br/>110<br/>113<br/>141<br/>166<br/>102<br/>105<br/>33<br/>82<br/>220<br/>233<br/>118<br/>36<br/>73<br/>88<br/>196<br/>152<br/>15<br/>231<br/>164<br/>119<br/>
When I use the Drupal function: [_password_base64_encode][1] I get the following base64 string:
/fjk/u1DAgulUpETay8IJZM5DoP6briMZCmGuLfZXwOUiqE1tJi5h0bo0IePlpcdaZK6GlRuqFGGMFAaDQCdr/
But when I use this sequence of bytes in my iOS application with the code:
NSString *base64Encoded = [hash base64EncodedStringWithOptions:0];
I get:
wfrCgT48DKvHYA19pq9QVYkdD70h5+1ipSNL
Why this behavior?
Thanks

Answer 1

Ported the function _password_base64_encode to iOS:
- (NSString*)drupalBase64PasswordEncode:(NSData*)data {
NSUInteger count = [data length];
int i = 0;
NSString *itTo64String = #"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
const char *itTo64 = [itTo64String cStringUsingEncoding:NSUTF8StringEncoding];
char *input = [data bytes];
NSMutableString *output = [[NSMutableString alloc] init];
do {
unsigned char value = (unsigned char)input[i++];
int value2;
unsigned char toInsert = itTo64[value & 0x3f];
[output appendString:[NSString stringWithFormat:#"%c" , toInsert]];
if (i < count) {
value2 = value | ((unsigned char)input[i] << 8);
}
toInsert = itTo64[(value2 >> 6) & 0x3f];
[output appendString:[NSString stringWithFormat:#"%c" , toInsert]];
if (i++ >= count) {
break;
}
if (i < count) {
value2 = value2 | ((unsigned char)input[i] << 16);
}
toInsert = itTo64[(value2 >> 12) & 0x3F];
[output appendString:[NSString stringWithFormat:#"%c" , toInsert]];
if (i++ >= count) {
break;
}
toInsert = itTo64[(value2 >> 18) & 0x3F];
[output appendString:[NSString stringWithFormat:#"%c" , toInsert]];
}while(i < count);
return output;
}

Answer 2

The most likely explanation is that you're encoding junk along with your intended string - can you dump the actual string that gets encoded, such as
$string = ' ... ';
var_dump($string);
$base64_string = _password_base64_encode($string);
var_dump($string);
It is most likely that you are including different characters ( breaks, newlines in different format, etc ) than you intended when encoding.
In addition, you might want to compare the output with PHP's native base64_encode function, and compare results.