sha1.mm

@implementation NSString (JPCSHA1)

- (NSString *)jpc_SHA1String
{
    unsigned char md[CC_SHA1_DIGEST_LENGTH];
    NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
    CC_SHA1([data bytes], [data length], md);
    NSMutableString *result = [NSMutableString string];
    for (int ii = 0; ii < CC_SHA1_DIGEST_LENGTH; ii++) {
        [result appendFormat:@"%02x", md[ii]];
    }
    return result;
}

@end

// usage [@"testsha1" jpc_SHA1String] => outputs "1dee4b1affb249bc74c20379e60166366b71394f"