[51770] | 1 | /* $Id: asn1-ut-bitstring-decode.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
|
---|
| 2 | /** @file
|
---|
| 3 | * IPRT - ASN.1, BIT STRING Type, Decoding.
|
---|
| 4 | */
|
---|
| 5 |
|
---|
| 6 | /*
|
---|
[98103] | 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
|
---|
[51770] | 8 | *
|
---|
[96407] | 9 | * This file is part of VirtualBox base platform packages, as
|
---|
| 10 | * available from https://www.virtualbox.org.
|
---|
[51770] | 11 | *
|
---|
[96407] | 12 | * This program is free software; you can redistribute it and/or
|
---|
| 13 | * modify it under the terms of the GNU General Public License
|
---|
| 14 | * as published by the Free Software Foundation, in version 3 of the
|
---|
| 15 | * License.
|
---|
| 16 | *
|
---|
| 17 | * This program is distributed in the hope that it will be useful, but
|
---|
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
| 20 | * General Public License for more details.
|
---|
| 21 | *
|
---|
| 22 | * You should have received a copy of the GNU General Public License
|
---|
| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
---|
| 24 | *
|
---|
[51770] | 25 | * The contents of this file may alternatively be used under the terms
|
---|
| 26 | * of the Common Development and Distribution License Version 1.0
|
---|
[96407] | 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
---|
| 28 | * in the VirtualBox distribution, in which case the provisions of the
|
---|
[51770] | 29 | * CDDL are applicable instead of those of the GPL.
|
---|
| 30 | *
|
---|
| 31 | * You may elect to license modified versions of this file under the
|
---|
| 32 | * terms and conditions of either the GPL or the CDDL or both.
|
---|
[96407] | 33 | *
|
---|
| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
---|
[51770] | 35 | */
|
---|
| 36 |
|
---|
[57358] | 37 |
|
---|
| 38 | /*********************************************************************************************************************************
|
---|
| 39 | * Header Files *
|
---|
| 40 | *********************************************************************************************************************************/
|
---|
[51770] | 41 | #include "internal/iprt.h"
|
---|
| 42 | #include <iprt/asn1.h>
|
---|
| 43 |
|
---|
| 44 | #include <iprt/err.h>
|
---|
| 45 | #include <iprt/string.h>
|
---|
| 46 |
|
---|
| 47 | #include <iprt/formats/asn1.h>
|
---|
| 48 |
|
---|
| 49 |
|
---|
| 50 |
|
---|
| 51 | RTDECL(int) RTAsn1BitString_DecodeAsn1Ex(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t cMaxBits, PRTASN1BITSTRING pThis,
|
---|
| 52 | const char *pszErrorTag)
|
---|
| 53 | {
|
---|
| 54 | pThis->cBits = 0;
|
---|
| 55 | pThis->cMaxBits = cMaxBits;
|
---|
| 56 | pThis->uBits.pv = NULL;
|
---|
| 57 | pThis->pEncapsulated = NULL;
|
---|
| 58 | RTAsn1CursorInitAllocation(pCursor, &pThis->EncapsulatedAllocation);
|
---|
| 59 |
|
---|
| 60 | int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
|
---|
| 61 | if (RT_SUCCESS(rc))
|
---|
| 62 | {
|
---|
| 63 | rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, ASN1_TAG_BIT_STRING,
|
---|
| 64 | ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
|
---|
| 65 | fFlags, pszErrorTag, "BIT STRING");
|
---|
| 66 | if (RT_SUCCESS(rc))
|
---|
| 67 | {
|
---|
| 68 | if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
|
---|
| 69 | {
|
---|
| 70 | if ( ( cMaxBits == UINT32_MAX
|
---|
| 71 | || RT_ALIGN(cMaxBits, 8) / 8 + 1 >= pThis->Asn1Core.cb)
|
---|
| 72 | && pThis->Asn1Core.cb > 0)
|
---|
| 73 | {
|
---|
| 74 | uint8_t cUnusedBits = pThis->Asn1Core.cb > 0 ? *pThis->Asn1Core.uData.pu8 : 0;
|
---|
| 75 | if (pThis->Asn1Core.cb < 2)
|
---|
| 76 | {
|
---|
| 77 | /* Not bits present. */
|
---|
| 78 | if (cUnusedBits == 0)
|
---|
| 79 | {
|
---|
| 80 | pThis->cBits = 0;
|
---|
| 81 | pThis->uBits.pv = NULL;
|
---|
| 82 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
|
---|
| 83 | pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
|
---|
| 84 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
|
---|
| 85 | return VINF_SUCCESS;
|
---|
| 86 | }
|
---|
| 87 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
|
---|
| 88 | "%s: Bad unused bit count: %#x (cb=%#x)",
|
---|
| 89 | pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
|
---|
| 90 | }
|
---|
| 91 | else if (cUnusedBits < 8)
|
---|
| 92 | {
|
---|
| 93 | pThis->cBits = (pThis->Asn1Core.cb - 1) * 8;
|
---|
| 94 | pThis->cBits -= cUnusedBits;
|
---|
| 95 | pThis->uBits.pu8 = pThis->Asn1Core.uData.pu8 + 1;
|
---|
| 96 | if ( !(pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER))
|
---|
| 97 | || cUnusedBits == 0
|
---|
| 98 | || !( pThis->uBits.pu8[pThis->Asn1Core.cb - 2] & (((uint8_t)1 << cUnusedBits) - (uint8_t)1) ) )
|
---|
| 99 | {
|
---|
| 100 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
|
---|
| 101 | pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
|
---|
| 102 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
|
---|
| 103 | return VINF_SUCCESS;
|
---|
| 104 | }
|
---|
| 105 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
|
---|
| 106 | "%s: Unused bits shall be zero in DER/CER mode: last byte=%#x cUnused=%#x",
|
---|
| 107 | pszErrorTag, pThis->uBits.pu8[pThis->cBits / 8], cUnusedBits);
|
---|
| 108 | }
|
---|
| 109 | else
|
---|
| 110 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
|
---|
| 111 | "%s: Bad unused bit count: %#x (cb=%#x)",
|
---|
| 112 | pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
|
---|
| 113 | }
|
---|
| 114 | else
|
---|
| 115 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
|
---|
| 116 | "%s: Size mismatch: cb=%#x, expected %#x (cMaxBits=%#x)",
|
---|
| 117 | pszErrorTag, pThis->Asn1Core.cb, RT_ALIGN(cMaxBits, 8) / 8 + 1, cMaxBits);
|
---|
| 118 | }
|
---|
| 119 | else
|
---|
| 120 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
|
---|
| 121 | "%s: Constructed BIT STRING not implemented.", pszErrorTag);
|
---|
| 122 | }
|
---|
| 123 | }
|
---|
| 124 | RT_ZERO(*pThis);
|
---|
| 125 | return rc;
|
---|
| 126 | }
|
---|
| 127 |
|
---|
| 128 |
|
---|
| 129 | RTDECL(int) RTAsn1BitString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1BITSTRING pThis, const char *pszErrorTag)
|
---|
| 130 | {
|
---|
| 131 | return RTAsn1BitString_DecodeAsn1Ex(pCursor, fFlags, UINT32_MAX, pThis, pszErrorTag);
|
---|
| 132 | }
|
---|
| 133 |
|
---|
| 134 |
|
---|
| 135 | /*
|
---|
| 136 | * Generate code for the associated collection types.
|
---|
| 137 | */
|
---|
| 138 | #define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-bitstring-template.h"
|
---|
| 139 | #include <iprt/asn1-generator-internal-header.h>
|
---|
| 140 | #include <iprt/asn1-generator-asn1-decoder.h>
|
---|
| 141 |
|
---|