count += len; // update number of bytes
        final int partLen = BLOCK_LENGTH - bufferNdx;
        int i = 0;
        if (len >= partLen) {
            System.arraycopy(input, offset, buffer, bufferNdx, partLen);

            transform(buffer, 0);

            for (i = partLen; i + BLOCK_LENGTH - 1 < len; i += BLOCK_LENGTH) {
                transform(input, offset + i);
            }