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/* $Id: asn1-ut-bitstring-decode.cpp $ */
/** @file
* IPRT - ASN.1, BIT STRING Type, Decoding.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/asn1.h>
#include <iprt/err.h>
#include <iprt/string.h>
#include <iprt/formats/asn1.h>
RTDECL(int) RTAsn1BitString_DecodeAsn1Ex(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t cMaxBits, PRTASN1BITSTRING pThis,
const char *pszErrorTag)
{
pThis->cBits = 0;
pThis->cMaxBits = cMaxBits;
pThis->uBits.pv = NULL;
pThis->pEncapsulated = NULL;
RTAsn1CursorInitAllocation(pCursor, &pThis->EncapsulatedAllocation);
int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
if (RT_SUCCESS(rc))
{
rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, ASN1_TAG_BIT_STRING,
ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
fFlags, pszErrorTag, "BIT STRING");
if (RT_SUCCESS(rc))
{
if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
{
if ( ( cMaxBits == UINT32_MAX
|| RT_ALIGN(cMaxBits, 8) / 8 + 1 >= pThis->Asn1Core.cb)
&& pThis->Asn1Core.cb > 0)
{
uint8_t cUnusedBits = pThis->Asn1Core.cb > 0 ? *pThis->Asn1Core.uData.pu8 : 0;
if (pThis->Asn1Core.cb < 2)
{
/* Not bits present. */
if (cUnusedBits == 0)
{
pThis->cBits = 0;
pThis->uBits.pv = NULL;
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
return VINF_SUCCESS;
}
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Bad unused bit count: %#x (cb=%#x)",
pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
}
else if (cUnusedBits < 8)
{
pThis->cBits = (pThis->Asn1Core.cb - 1) * 8;
pThis->cBits -= cUnusedBits;
pThis->uBits.pu8 = pThis->Asn1Core.uData.pu8 + 1;
if ( !(pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER))
|| cUnusedBits == 0
|| !( pThis->uBits.pu8[pThis->Asn1Core.cb - 2] & (((uint8_t)1 << cUnusedBits) - (uint8_t)1) ) )
{
RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
return VINF_SUCCESS;
}
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Unused bits shall be zero in DER/CER mode: last byte=%#x cUnused=%#x",
pszErrorTag, pThis->uBits.pu8[pThis->cBits / 8], cUnusedBits);
}
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Bad unused bit count: %#x (cb=%#x)",
pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
}
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
"%s: Size mismatch: cb=%#x, expected %#x (cMaxBits=%#x)",
pszErrorTag, pThis->Asn1Core.cb, RT_ALIGN(cMaxBits, 8) / 8 + 1, cMaxBits);
}
else
rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
"%s: Constructed BIT STRING not implemented.", pszErrorTag);
}
}
RT_ZERO(*pThis);
return rc;
}
RTDECL(int) RTAsn1BitString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1BITSTRING pThis, const char *pszErrorTag)
{
return RTAsn1BitString_DecodeAsn1Ex(pCursor, fFlags, UINT32_MAX, pThis, pszErrorTag);
}
/*
* Generate code for the associated collection types.
*/
#define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-bitstring-template.h"
#include <iprt/asn1-generator-internal-header.h>
#include <iprt/asn1-generator-asn1-decoder.h>
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