Archive for September, 2009

Objective-C SHA1 Function for the iPhone

Friday, September 25th, 2009

Here’s a nice little function that will generate an SHA-1 hash digest that will match what the php sha1() function will generate if you give it the same input:

#import

@implementation SHA1

+(NSString*) digest:(NSString*)input
{
const char *cstr = [input cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:input.length];

uint8_t digest[CC_SHA1_DIGEST_LENGTH];

CC_SHA1(data.bytes, data.length, digest);

NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];

for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)
[output appendFormat:@"%02x", digest[i]];

return output;

}


@end

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