1 | /* $Id: asn1-ut-bitstring-decode.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - ASN.1, BIT STRING Type, Decoding.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2017 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include "internal/iprt.h"
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32 | #include <iprt/asn1.h>
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33 |
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34 | #include <iprt/err.h>
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35 | #include <iprt/string.h>
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36 |
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37 | #include <iprt/formats/asn1.h>
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38 |
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39 |
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40 |
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41 | RTDECL(int) RTAsn1BitString_DecodeAsn1Ex(PRTASN1CURSOR pCursor, uint32_t fFlags, uint32_t cMaxBits, PRTASN1BITSTRING pThis,
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42 | const char *pszErrorTag)
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43 | {
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44 | pThis->cBits = 0;
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45 | pThis->cMaxBits = cMaxBits;
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46 | pThis->uBits.pv = NULL;
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47 | pThis->pEncapsulated = NULL;
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48 | RTAsn1CursorInitAllocation(pCursor, &pThis->EncapsulatedAllocation);
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49 |
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50 | int rc = RTAsn1CursorReadHdr(pCursor, &pThis->Asn1Core, pszErrorTag);
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51 | if (RT_SUCCESS(rc))
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52 | {
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53 | rc = RTAsn1CursorMatchTagClassFlagsString(pCursor, &pThis->Asn1Core, ASN1_TAG_BIT_STRING,
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54 | ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
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55 | fFlags, pszErrorTag, "BIT STRING");
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56 | if (RT_SUCCESS(rc))
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57 | {
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58 | if (!(pThis->Asn1Core.fClass & ASN1_TAGFLAG_CONSTRUCTED))
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59 | {
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60 | if ( ( cMaxBits == UINT32_MAX
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61 | || RT_ALIGN(cMaxBits, 8) / 8 + 1 >= pThis->Asn1Core.cb)
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62 | && pThis->Asn1Core.cb > 0)
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63 | {
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64 | uint8_t cUnusedBits = pThis->Asn1Core.cb > 0 ? *pThis->Asn1Core.uData.pu8 : 0;
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65 | if (pThis->Asn1Core.cb < 2)
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66 | {
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67 | /* Not bits present. */
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68 | if (cUnusedBits == 0)
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69 | {
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70 | pThis->cBits = 0;
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71 | pThis->uBits.pv = NULL;
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72 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
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73 | pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
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74 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
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75 | return VINF_SUCCESS;
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76 | }
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77 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
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78 | "%s: Bad unused bit count: %#x (cb=%#x)",
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79 | pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
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80 | }
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81 | else if (cUnusedBits < 8)
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82 | {
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83 | pThis->cBits = (pThis->Asn1Core.cb - 1) * 8;
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84 | pThis->cBits -= cUnusedBits;
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85 | pThis->uBits.pu8 = pThis->Asn1Core.uData.pu8 + 1;
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86 | if ( !(pCursor->fFlags & (RTASN1CURSOR_FLAGS_DER | RTASN1CURSOR_FLAGS_CER))
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87 | || cUnusedBits == 0
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88 | || !( pThis->uBits.pu8[pThis->Asn1Core.cb - 2] & (((uint8_t)1 << cUnusedBits) - (uint8_t)1) ) )
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89 | {
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90 | RTAsn1CursorSkip(pCursor, pThis->Asn1Core.cb);
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91 | pThis->Asn1Core.pOps = &g_RTAsn1BitString_Vtable;
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92 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_PRIMITE_TAG_STRUCT;
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93 | return VINF_SUCCESS;
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94 | }
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95 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
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96 | "%s: Unused bits shall be zero in DER/CER mode: last byte=%#x cUnused=%#x",
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97 | pszErrorTag, pThis->uBits.pu8[pThis->cBits / 8], cUnusedBits);
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98 | }
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99 | else
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100 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
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101 | "%s: Bad unused bit count: %#x (cb=%#x)",
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102 | pszErrorTag, cUnusedBits, pThis->Asn1Core.cb);
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103 | }
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104 | else
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105 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_INVALID_BITSTRING_ENCODING,
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106 | "%s: Size mismatch: cb=%#x, expected %#x (cMaxBits=%#x)",
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107 | pszErrorTag, pThis->Asn1Core.cb, RT_ALIGN(cMaxBits, 8) / 8 + 1, cMaxBits);
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108 | }
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109 | else
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110 | rc = RTAsn1CursorSetInfo(pCursor, VERR_ASN1_CONSTRUCTED_STRING_NOT_IMPL,
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111 | "%s: Constructed BIT STRING not implemented.", pszErrorTag);
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112 | }
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113 | }
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114 | RT_ZERO(*pThis);
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115 | return rc;
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116 | }
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117 |
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118 |
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119 | RTDECL(int) RTAsn1BitString_DecodeAsn1(PRTASN1CURSOR pCursor, uint32_t fFlags, PRTASN1BITSTRING pThis, const char *pszErrorTag)
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120 | {
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121 | return RTAsn1BitString_DecodeAsn1Ex(pCursor, fFlags, UINT32_MAX, pThis, pszErrorTag);
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122 | }
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123 |
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124 |
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125 | /*
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126 | * Generate code for the associated collection types.
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127 | */
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128 | #define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-bitstring-template.h"
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129 | #include <iprt/asn1-generator-internal-header.h>
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130 | #include <iprt/asn1-generator-asn1-decoder.h>
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131 |
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