final int securityBufferLength = SMBUtil.readInt2(buffer, bufferIndex + 2);
        bufferIndex += 4;

        final int pad = bufferIndex - (getHeaderStart() + securityBufferOffset);
        this.blob = new byte[securityBufferLength];
        System.arraycopy(buffer, getHeaderStart() + securityBufferOffset, this.blob, 0, securityBufferLength);
        bufferIndex += pad;

        final int securityBufferLength = SMBUtil.readInt2(buffer, bufferIndex + 2);
        bufferIndex += 4;

        final int negotiateContextOffset = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;

        // Validate security buffer parameters
        if (securityBufferLength < 0 || securityBufferLength > 65536) { // 64KB max for security buffer