CFDataRef vs NSData file hashing

Question

I want to hash a file (using SHA1 at the moment). Here is the function:

static inline __attribute__((always_inline)) NSString *SHA1String(NSData *data) {
    uint8_t digest[CC_SHA1_DIGEST_LENGTH];
    CC_SHA1(data.bytes, (CC_LONG)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;
}

And here are the two different methods of loading the data:

CFURLRef filePath = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, CFSTR("/path/to/file"), kCFURLPOSIXPathStyle, false);
CFDataRef cfFileData = CFURLCreateData(kCFAllocatorDefault, filePath, kCFStringEncodingUTF8, false);
NSString *cfFileHash = SHA1String((__bridge NSData *)cfFileData);

NSData *fileData = [NSData dataWithContentsOfURL:[NSURL fileURLWithPath:@"/path/to/file"]];
NSString *fileHash = SHA1String((__bridge NSData *)fileData);

NSLog(@"Hashes: %@ - %@", cfFileHash, fileHash);

The hashes differ and I wonder what is causing this. I'd like to use the CoreFoundation API, but if the file hash differs, that'd be bad. I use another file manager to view the sha1 of the file and it matches the one from NSData.

Any insights appreciated.