ObjXMPP  Diff

		uOld = [self XMPP_HMACWithKey: str
					 data: salty];

		for (j = 0; j < digestSize; j++)
			result[j] ^= uOld[j];

		for (j = 0; j < i - 1; j++) {
			tmp = [OFDataArray dataArray];
			tmp = [OFDataArray new];
			[tmp addItems: uOld
				count: digestSize];

			[pool releaseObjects]; // releases uOld and previous tmp
			[tmp autorelease];

			u = [self XMPP_HMACWithKey: str
					      data: tmp];

			for (k = 0; k < digestSize; k++)
				result[k] ^= u[k];

			uOld = u;

			[pool releaseObjects];
		}

		ret = [OFDataArray dataArray];
		[ret addItems: result
			count: digestSize];
	} @finally {
		[self freeMemory: result];