diff options
Diffstat (limited to 'src/VBox/Runtime/common/asn1/asn1-ut-bitstring-decode.cpp')
| -rw-r--r-- | src/VBox/Runtime/common/asn1/asn1-ut-bitstring-decode.cpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/asn1/asn1-ut-bitstring-decode.cpp b/src/VBox/Runtime/common/asn1/asn1-ut-bitstring-decode.cpp new file mode 100644 index 00000000..d4abc2c0 --- /dev/null +++ b/src/VBox/Runtime/common/asn1/asn1-ut-bitstring-decode.cpp @@ -0,0 +1,131 @@ +/* $Id: asn1-ut-bitstring-decode.cpp $ */ +/** @file + * IPRT - ASN.1, BIT STRING Type, Decoding. + */ + +/* + * Copyright (C) 2006-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + + +/********************************************************************************************************************************* +* 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> + |