SHA1 hash of a string in iPhone Cocoa

Take a look inside . You could add it as a category to NSString.

This snippet of code (based on one of my apps--one that just went out tonight!) uses SHA-256, which works in much the same way as SHA-1. It depends on the CommonCrypto headers.

unsigned char hashedChars[32];
CC_SHA256([inputString UTF8String],
 [inputString lengthOfBytesUsingEncoding:NSUTF8StringEncoding], 
 hashedChars);
NSData * hashedData = [NSData dataWithBytes:hashedChars length:32];

I'm trying to do the same thing, but something's not working right for me.
Trying to simulate encoding the simple "ab". hashedChars for me is size 33.

CC_SHA1([@"ab" UTF8String],
[@"ab" lengthOfBytesUsingEncoding:NSUTF8StringEncoding],
hashedChars);
hashedChars[32] = '\0';
printf("%s\n",hashedChars);

Result:

\332#aNF\232
|{ѽ\253\\234GK

Why am I getting these bogus values? Any ideas?

did you have to go through the export compliance hassle because of your application is using SHA-256?

SHA1 has a 160 bit result which is 20 bytes, SHA256 has a 256 bit result which is 32 bytes. Also the result is 8 bit unsigned chars so you must print them as data.

Hot flash from my wife: "If crypto was easy everyone would be doing it." Well she is wrong! Everyone is doing it--but badly.

Message was edited by: dgrassi, add wife's comment.

How would I convert that to a hex string?