1 | /* $Id: asn1-ut-integer.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - ASN.1, INTEGER Type.
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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/bignum.h>
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35 | #include <iprt/err.h>
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36 | #include <iprt/string.h>
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37 |
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38 | #include <iprt/formats/asn1.h>
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39 |
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40 |
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41 | /*********************************************************************************************************************************
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42 | * Global Variables *
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43 | *********************************************************************************************************************************/
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44 | /** Fixed on-byte constants for small numbers.
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45 | * Good for structure version values and such. */
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46 | static const uint8_t g_abSmall[] =
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47 | {
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48 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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49 | 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
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50 | };
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51 |
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52 |
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53 |
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54 | /*
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55 | * ASN.1 INTEGER - Special Methods.
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56 | */
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57 |
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58 |
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59 | /**
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60 | * Updates the native value we keep in RTASN1INTEGER::uValue.
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61 | *
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62 | * @param pThis The integer.
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63 | */
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64 | static void rtAsn1Integer_UpdateNativeValue(PRTASN1INTEGER pThis)
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65 | {
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66 | uint32_t offLast = pThis->Asn1Core.cb - 1;
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67 | switch (pThis->Asn1Core.cb)
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68 | {
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69 | default:
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70 | case 8: pThis->uValue.u |= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 7] << 56; RT_FALL_THRU();
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71 | case 7: pThis->uValue.u |= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 6] << 48; RT_FALL_THRU();
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72 | case 6: pThis->uValue.u |= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 5] << 40; RT_FALL_THRU();
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73 | case 5: pThis->uValue.u |= (uint64_t)pThis->Asn1Core.uData.pu8[offLast - 4] << 32; RT_FALL_THRU();
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74 | case 4: pThis->uValue.u |= (uint32_t)pThis->Asn1Core.uData.pu8[offLast - 3] << 24; RT_FALL_THRU();
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75 | case 3: pThis->uValue.u |= (uint32_t)pThis->Asn1Core.uData.pu8[offLast - 2] << 16; RT_FALL_THRU();
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76 | case 2: pThis->uValue.u |= (uint16_t)pThis->Asn1Core.uData.pu8[offLast - 1] << 8; RT_FALL_THRU();
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77 | case 1: pThis->uValue.u |= pThis->Asn1Core.uData.pu8[offLast];
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78 | }
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79 | }
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80 |
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81 |
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82 | RTDECL(int) RTAsn1Integer_InitU64(PRTASN1INTEGER pThis, uint64_t uValue, PCRTASN1ALLOCATORVTABLE pAllocator)
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83 | {
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84 | /*
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85 | * Initialize the core and the native value.
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86 | */
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87 | RTAsn1Core_InitEx(&pThis->Asn1Core,
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88 | ASN1_TAG_INTEGER,
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89 | ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
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90 | &g_RTAsn1Integer_Vtable,
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91 | RTASN1CORE_F_PRESENT | RTASN1CORE_F_PRIMITE_TAG_STRUCT);
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92 | pThis->uValue.u = uValue;
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93 |
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94 | /*
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95 | * Use one of the constants if possible.
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96 | */
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97 | if (uValue < RT_ELEMENTS(g_abSmall))
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98 | {
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99 | pThis->Asn1Core.cb = 1;
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100 | pThis->Asn1Core.uData.pv = (void *)&g_abSmall[0];
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101 | }
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102 | else
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103 | {
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104 | /*
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105 | * Need to turn uValue into a big endian number without any
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106 | * unnecessary leading zero bytes.
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107 | */
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108 | /* Figure the size. */
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109 | uint32_t cb = 0;
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110 | if (uValue <= UINT32_MAX)
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111 | {
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112 | if (uValue <= UINT16_MAX)
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113 | {
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114 | if (uValue <= UINT8_MAX)
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115 | cb = 1;
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116 | else
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117 | cb = 2;
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118 | }
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119 | else
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120 | {
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121 | if (uValue <= UINT32_C(0xffffff))
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122 | cb = 3;
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123 | else
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124 | cb = 4;
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125 | }
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126 | }
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127 | else
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128 | {
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129 | if (uValue <= UINT64_C(0x0000FfffFfffFfff))
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130 | {
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131 | if (uValue <= UINT64_C(0x000000ffFfffFfff))
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132 | cb = 5;
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133 | else
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134 | cb = 6;
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135 | }
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136 | else
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137 | {
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138 | if (uValue <= UINT64_C(0x00ffFfffFfffFfff))
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139 | cb = 7;
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140 | else
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141 | cb = 8;
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142 | }
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143 | }
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144 |
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145 | /* Allocate space. */
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146 | int rc = RTAsn1ContentAllocZ(&pThis->Asn1Core, cb, pAllocator);
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147 | if (RT_FAILURE(rc))
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148 | {
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149 | RT_ZERO(*pThis);
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150 | return rc;
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151 | }
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152 |
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153 | /* Serialize the number in MSB order. */
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154 | uint8_t *pb = (uint8_t *)pThis->Asn1Core.uData.pu8;
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155 | while (cb-- > 0)
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156 | {
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157 | pb[cb] = (uint8_t)uValue;
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158 | uValue >>= 8;
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159 | }
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160 | Assert(uValue == 0);
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161 | }
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162 | return VINF_SUCCESS;
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163 | }
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164 |
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165 |
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166 | RTDECL(int) RTAsn1Integer_InitDefault(PRTASN1INTEGER pThis, uint64_t uValue, PCRTASN1ALLOCATORVTABLE pAllocator)
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167 | {
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168 | int rc = RTAsn1Integer_InitU64(pThis, uValue, pAllocator);
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169 | if (RT_SUCCESS(rc))
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170 | {
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171 | pThis->Asn1Core.fFlags &= ~RTASN1CORE_F_PRESENT;
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172 | pThis->Asn1Core.fFlags |= RTASN1CORE_F_DEFAULT;
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173 | }
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174 | return rc;
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175 | }
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176 |
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177 |
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178 | RTDECL(int32_t) RTAsn1Integer_UnsignedLastBit(PCRTASN1INTEGER pThis)
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179 | {
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180 | AssertReturn(pThis->Asn1Core.fFlags, -1);
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181 | uint8_t const *pb = pThis->Asn1Core.uData.pu8;
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182 | AssertReturn(pb, -1);
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183 | uint32_t cb = pThis->Asn1Core.cb;
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184 | AssertReturn(pThis->Asn1Core.cb < (uint32_t)INT32_MAX / 8, -1);
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185 |
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186 | while (cb-- > 0)
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187 | {
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188 | uint8_t b = *pb++;
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189 | if (b)
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190 | {
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191 | int32_t iRet = cb * 8;
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192 | if (b & 0x80) iRet += 7;
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193 | else if (b & 0x40) iRet += 6;
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194 | else if (b & 0x20) iRet += 5;
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195 | else if (b & 0x10) iRet += 4;
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196 | else if (b & 0x08) iRet += 3;
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197 | else if (b & 0x04) iRet += 2;
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198 | else if (b & 0x02) iRet += 1;
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199 | else Assert(b == 0x01);
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200 | return iRet;
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201 | }
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202 | }
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203 | return -1;
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204 | }
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205 |
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206 |
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207 | RTDECL(int) RTAsn1Integer_UnsignedCompare(PCRTASN1INTEGER pLeft, PCRTASN1INTEGER pRight)
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208 | {
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209 | Assert(pLeft && (!RTAsn1Integer_IsPresent(pLeft) || pLeft->Asn1Core.pOps == &g_RTAsn1Integer_Vtable));
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210 | Assert(pRight && (!RTAsn1Integer_IsPresent(pRight) || pRight->Asn1Core.pOps == &g_RTAsn1Integer_Vtable));
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211 |
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212 | int iDiff;
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213 | if (RTAsn1Integer_IsPresent(pLeft))
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214 | {
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215 | if (RTAsn1Integer_IsPresent(pRight))
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216 | {
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217 | if ( pLeft->Asn1Core.cb > 8
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218 | || pRight->Asn1Core.cb > 8)
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219 | {
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220 | uint32_t iLeft = RTAsn1Integer_UnsignedLastBit(pLeft);
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221 | uint32_t iRight = RTAsn1Integer_UnsignedLastBit(pRight);
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222 | if (iLeft != iRight)
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223 | return iLeft < iRight ? -1 : 1;
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224 |
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225 | uint32_t i = iLeft / 8;
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226 | if (i > 8)
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227 | {
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228 | uint8_t const *pbLeft = &pLeft->Asn1Core.uData.pu8[pLeft->Asn1Core.cb - i - 1];
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229 | uint8_t const *pbRight = &pRight->Asn1Core.uData.pu8[pRight->Asn1Core.cb - i - 1];
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230 | for (;;)
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231 | {
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232 | if (*pbLeft != *pbRight)
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233 | return *pbLeft < *pbRight ? -1 : 1;
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234 | if (--i <= 8)
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235 | break;
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236 | pbLeft++;
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237 | pbRight++;
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238 | }
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239 | }
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240 | }
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241 |
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242 | if (pLeft->uValue.u == pRight->uValue.u)
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243 | iDiff = 0;
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244 | else
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245 | iDiff = pLeft->uValue.u < pRight->uValue.u ? -1 : 1;
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246 | }
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247 | else
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248 | iDiff = -1;
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249 | }
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250 | else
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251 | iDiff = 0 - (int)RTAsn1Integer_IsPresent(pRight);
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252 | return iDiff;
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253 | }
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254 |
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255 |
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256 | RTDECL(int) RTAsn1Integer_UnsignedCompareWithU64(PCRTASN1INTEGER pThis, uint64_t u64Const)
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257 | {
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258 | int iDiff;
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259 | if (RTAsn1Integer_IsPresent(pThis))
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260 | {
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261 | if (pThis->Asn1Core.cb > 8)
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262 | {
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263 | int32_t iLast = RTAsn1Integer_UnsignedLastBit(pThis);
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264 | if (iLast >= 64)
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265 | return 1;
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266 | }
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267 |
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268 | if (pThis->uValue.u == u64Const)
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269 | iDiff = 0;
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270 | else
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271 | iDiff = pThis->uValue.u < u64Const ? -1 : 1;
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272 | }
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273 | else
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274 | iDiff = 1;
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275 | return iDiff;
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276 | }
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277 |
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278 |
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279 | RTDECL(int) RTAsn1Integer_UnsignedCompareWithU32(PCRTASN1INTEGER pThis, uint32_t u32Const)
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280 | {
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281 | int iDiff;
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282 | if (RTAsn1Integer_IsPresent(pThis))
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283 | {
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284 | if (pThis->Asn1Core.cb > 8)
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285 | {
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286 | int32_t iLast = RTAsn1Integer_UnsignedLastBit(pThis);
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287 | if (iLast >= 32)
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288 | return 1;
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289 | }
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290 |
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291 | if (pThis->uValue.u == u32Const)
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292 | iDiff = 0;
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293 | else
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294 | iDiff = pThis->uValue.u < u32Const ? -1 : 1;
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295 | }
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296 | else
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297 | iDiff = 1;
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298 | return iDiff;
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299 | }
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300 |
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301 |
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302 | RTDECL(int) RTAsn1Integer_ToBigNum(PCRTASN1INTEGER pThis, PRTBIGNUM pBigNum, uint32_t fBigNumInit)
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303 | {
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304 | AssertReturn(!(fBigNumInit & ~( RTBIGNUMINIT_F_SENSITIVE | RTBIGNUMINIT_F_UNSIGNED | RTBIGNUMINIT_F_SIGNED
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305 | | RTBIGNUMINIT_F_ENDIAN_LITTLE | RTBIGNUMINIT_F_ENDIAN_BIG)),
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306 | VERR_INVALID_PARAMETER);
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307 | AssertReturn(RTAsn1Integer_IsPresent(pThis), VERR_INVALID_PARAMETER);
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308 |
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309 | if (!(fBigNumInit & (RTBIGNUMINIT_F_UNSIGNED | RTBIGNUMINIT_F_SIGNED)))
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310 | fBigNumInit |= RTBIGNUMINIT_F_SIGNED;
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311 |
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312 | if (!(fBigNumInit & (RTBIGNUMINIT_F_ENDIAN_BIG | RTBIGNUMINIT_F_ENDIAN_LITTLE)))
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313 | fBigNumInit |= RTBIGNUMINIT_F_ENDIAN_BIG;
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314 |
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315 | return RTBigNumInit(pBigNum, fBigNumInit, pThis->Asn1Core.uData.pv, pThis->Asn1Core.cb);
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316 | }
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317 |
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318 |
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319 | RTDECL(int) RTAsn1Integer_FromBigNum(PRTASN1INTEGER pThis, PCRTBIGNUM pBigNum, PCRTASN1ALLOCATORVTABLE pAllocator)
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320 | {
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321 | AssertPtr(pThis); AssertPtr(pBigNum); AssertPtr(pAllocator);
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322 |
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323 | /* Be nice and auto init the object. */
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324 | if (!RTAsn1Integer_IsPresent(pThis))
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325 | RTAsn1Integer_Init(pThis, NULL);
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326 |
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327 | uint32_t cb = RTBigNumByteWidth(pBigNum); Assert(cb > 0);
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328 | int rc = RTAsn1ContentReallocZ(&pThis->Asn1Core, cb, pAllocator);
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329 | if (RT_SUCCESS(rc))
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330 | {
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331 | Assert(cb == pThis->Asn1Core.cb);
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332 | rc = RTBigNumToBytesBigEndian(pBigNum, (void *)pThis->Asn1Core.uData.pv, cb);
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333 | if (RT_SUCCESS(rc))
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334 | rtAsn1Integer_UpdateNativeValue(pThis);
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335 | }
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336 | return rc;
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337 | }
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338 |
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339 |
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340 | RTDECL(int) RTAsn1Integer_ToString(PRTASN1INTEGER pThis, char *pszBuf, size_t cbBuf, uint32_t fFlags, size_t *pcbActual)
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341 | {
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342 | AssertReturn(RTAsn1Integer_IsPresent(pThis), VERR_INVALID_PARAMETER);
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343 | AssertReturn(fFlags == 0, VERR_INVALID_FLAGS);
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344 |
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345 | /*
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346 | * We only do hex conversions via this API.
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347 | * Currently we consider all numbers to be unsigned.
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348 | */
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349 | /** @todo Signed ASN.1 INTEGER. */
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350 | int rc;
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351 | size_t cbActual;
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352 | if (pThis->Asn1Core.cb <= 8)
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353 | {
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354 | cbActual = 2 + pThis->Asn1Core.cb*2 + 1;
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355 | if (cbActual <= cbBuf)
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356 | {
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357 | ssize_t cchFormat = RTStrFormatU64(pszBuf, cbBuf, pThis->uValue.u, 16, (int)cbActual - 1 /*cchWidth*/, 0,
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358 | RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD);
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359 | rc = VINF_SUCCESS;
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360 | AssertStmt(cchFormat == (ssize_t)cbActual - 1, rc = VERR_INTERNAL_ERROR_3);
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361 | }
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362 | else
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363 | rc = VERR_BUFFER_OVERFLOW;
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364 | }
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365 | else
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366 | {
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367 | cbActual = pThis->Asn1Core.cb * 3 - 1 /* save one separator */ + 1 /* terminator */;
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368 | if (cbActual <= cbBuf)
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369 | {
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370 | rc = RTStrPrintHexBytes(pszBuf, cbBuf, pThis->Asn1Core.uData.pv, pThis->Asn1Core.cb, RTSTRPRINTHEXBYTES_F_SEP_SPACE);
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371 | Assert(rc == VINF_SUCCESS);
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372 | }
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373 | else
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374 | rc = VERR_BUFFER_OVERFLOW;
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375 | }
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376 | if (pcbActual)
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377 | *pcbActual = cbActual;
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378 | return rc;
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379 | }
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380 |
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381 |
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382 | /*
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383 | * ASN.1 INTEGER - Standard Methods.
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384 | */
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385 |
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386 | RT_DECL_DATA_CONST(RTASN1COREVTABLE const) g_RTAsn1Integer_Vtable =
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387 | {
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388 | "RTAsn1Integer",
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389 | sizeof(RTASN1INTEGER),
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390 | ASN1_TAG_INTEGER,
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391 | ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
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392 | 0,
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393 | (PFNRTASN1COREVTDTOR)RTAsn1Integer_Delete,
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394 | NULL,
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395 | (PFNRTASN1COREVTCLONE)RTAsn1Integer_Clone,
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396 | (PFNRTASN1COREVTCOMPARE)RTAsn1Integer_Compare,
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397 | (PFNRTASN1COREVTCHECKSANITY)RTAsn1Integer_CheckSanity,
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398 | NULL,
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399 | NULL
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400 | };
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401 |
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402 |
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403 | RTDECL(int) RTAsn1Integer_Init(PRTASN1INTEGER pThis, PCRTASN1ALLOCATORVTABLE pAllocator)
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404 | {
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405 | RT_NOREF_PV(pAllocator);
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406 | RTAsn1Core_InitEx(&pThis->Asn1Core,
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407 | ASN1_TAG_INTEGER,
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408 | ASN1_TAGCLASS_UNIVERSAL | ASN1_TAGFLAG_PRIMITIVE,
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409 | &g_RTAsn1Integer_Vtable,
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410 | RTASN1CORE_F_PRESENT | RTASN1CORE_F_PRIMITE_TAG_STRUCT);
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411 | pThis->uValue.u = 1;
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412 | pThis->Asn1Core.cb = 1;
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413 | pThis->Asn1Core.uData.pv = (void *)&g_abSmall[0];
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414 | return VINF_SUCCESS;
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415 | }
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416 |
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417 |
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418 | RTDECL(int) RTAsn1Integer_Clone(PRTASN1INTEGER pThis, PCRTASN1INTEGER pSrc, PCRTASN1ALLOCATORVTABLE pAllocator)
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419 | {
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420 | AssertPtr(pSrc); AssertPtr(pThis); AssertPtr(pAllocator);
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421 | RT_ZERO(*pThis);
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422 | if (RTAsn1Integer_IsPresent(pSrc))
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423 | {
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424 | AssertReturn(pSrc->Asn1Core.pOps == &g_RTAsn1Integer_Vtable, VERR_INTERNAL_ERROR_3);
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425 |
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426 | int rc;
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427 | if ( pSrc->Asn1Core.cb != 1
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428 | || pSrc->uValue.u >= RT_ELEMENTS(g_abSmall))
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429 | {
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430 | /* Value is too large, copy it. */
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431 | rc = RTAsn1Core_CloneContent(&pThis->Asn1Core, &pSrc->Asn1Core, pAllocator);
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432 | if (RT_FAILURE(rc))
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433 | return rc;
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434 | }
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435 | else
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436 | {
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437 | /* Use one of the const values. */
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438 | rc = RTAsn1Core_CloneNoContent(&pThis->Asn1Core, &pSrc->Asn1Core);
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439 | if (RT_FAILURE(rc))
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440 | return rc;
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441 | Assert(g_abSmall[pSrc->uValue.u] == pSrc->uValue.u);
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442 | pThis->Asn1Core.uData.pv = (void *)&g_abSmall[pSrc->uValue.u];
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443 | }
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444 | pThis->uValue.u = pSrc->uValue.u;
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445 | }
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446 | return VINF_SUCCESS;
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447 | }
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448 |
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449 |
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450 | RTDECL(void) RTAsn1Integer_Delete(PRTASN1INTEGER pThis)
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451 | {
|
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452 | if ( pThis
|
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453 | && RTAsn1Integer_IsPresent(pThis))
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454 | {
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455 | Assert(pThis->Asn1Core.pOps == &g_RTAsn1Integer_Vtable);
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456 |
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457 | RTAsn1ContentFree(&pThis->Asn1Core);
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458 | RT_ZERO(*pThis);
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459 | }
|
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460 | }
|
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461 |
|
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462 |
|
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463 | RTDECL(int) RTAsn1Integer_Enum(PRTASN1INTEGER pThis, PFNRTASN1ENUMCALLBACK pfnCallback, uint32_t uDepth, void *pvUser)
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464 | {
|
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465 | RT_NOREF_PV(pThis); RT_NOREF_PV(pfnCallback); RT_NOREF_PV(uDepth); RT_NOREF_PV(pvUser);
|
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466 | Assert(pThis && (!RTAsn1Integer_IsPresent(pThis) || pThis->Asn1Core.pOps == &g_RTAsn1Integer_Vtable));
|
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467 |
|
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468 | /* No children to enumerate. */
|
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469 | return VINF_SUCCESS;
|
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470 | }
|
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471 |
|
---|
472 |
|
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473 | RTDECL(int) RTAsn1Integer_Compare(PCRTASN1INTEGER pLeft, PCRTASN1INTEGER pRight)
|
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474 | {
|
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475 | return RTAsn1Integer_UnsignedCompare(pLeft, pRight);
|
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476 | }
|
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477 |
|
---|
478 |
|
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479 | RTDECL(int) RTAsn1Integer_CheckSanity(PCRTASN1INTEGER pThis, uint32_t fFlags, PRTERRINFO pErrInfo, const char *pszErrorTag)
|
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480 | {
|
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481 | RT_NOREF_PV(fFlags);
|
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482 | if (RT_UNLIKELY(!RTAsn1Integer_IsPresent(pThis)))
|
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483 | return RTErrInfoSetF(pErrInfo, VERR_ASN1_NOT_PRESENT, "%s: Missing (INTEGER).", pszErrorTag);
|
---|
484 | return VINF_SUCCESS;
|
---|
485 | }
|
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486 |
|
---|
487 |
|
---|
488 | /*
|
---|
489 | * Generate code for the associated collection types.
|
---|
490 | */
|
---|
491 | #define RTASN1TMPL_TEMPLATE_FILE "../common/asn1/asn1-ut-integer-template.h"
|
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492 | #include <iprt/asn1-generator-internal-header.h>
|
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493 | #include <iprt/asn1-generator-core.h>
|
---|
494 | #include <iprt/asn1-generator-init.h>
|
---|
495 | #include <iprt/asn1-generator-sanity.h>
|
---|
496 |
|
---|