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annotate libtommath/tommath_private.h @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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2 /* SPDX-License-Identifier: Unlicense */
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3
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4 #ifndef TOMMATH_PRIV_H_
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5 #define TOMMATH_PRIV_H_
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6
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7 #include "tommath.h"
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8 #include "tommath_class.h"
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9
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10 /*
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11 * Private symbols
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12 * ---------------
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13 *
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14 * On Unix symbols can be marked as hidden if libtommath is compiled
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15 * as a shared object. By default, symbols are visible.
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16 * As of now, this feature is opt-in via the MP_PRIVATE_SYMBOLS define.
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17 *
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18 * On Win32 a .def file must be used to specify the exported symbols.
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19 */
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20 #if defined (MP_PRIVATE_SYMBOLS) && defined(__GNUC__) && __GNUC__ >= 4
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21 # define MP_PRIVATE __attribute__ ((visibility ("hidden")))
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22 #else
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23 # define MP_PRIVATE
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24 #endif
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25
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26 /* Hardening libtommath
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27 * --------------------
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28 *
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29 * By default memory is zeroed before calling
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30 * MP_FREE to avoid leaking data. This is good
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31 * practice in cryptographical applications.
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32 *
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33 * Note however that memory allocators used
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34 * in cryptographical applications can often
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35 * be configured by itself to clear memory,
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36 * rendering the clearing in tommath unnecessary.
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37 * See for example https://github.com/GrapheneOS/hardened_malloc
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38 * and the option CONFIG_ZERO_ON_FREE.
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39 *
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40 * Furthermore there are applications which
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41 * value performance more and want this
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42 * feature to be disabled. For such applications
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43 * define MP_NO_ZERO_ON_FREE during compilation.
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44 */
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45 #ifdef MP_NO_ZERO_ON_FREE
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46 # define MP_FREE_BUFFER(mem, size) MP_FREE((mem), (size))
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47 # define MP_FREE_DIGITS(mem, digits) MP_FREE((mem), sizeof (mp_digit) * (size_t)(digits))
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48 #else
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49 # define MP_FREE_BUFFER(mem, size) \
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50 do { \
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51 size_t fs_ = (size); \
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52 void* fm_ = (mem); \
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53 if (fm_ != NULL) { \
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54 MP_ZERO_BUFFER(fm_, fs_); \
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55 MP_FREE(fm_, fs_); \
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56 } \
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57 } while (0)
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58 # define MP_FREE_DIGITS(mem, digits) \
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59 do { \
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60 int fd_ = (digits); \
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61 void* fm_ = (mem); \
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62 if (fm_ != NULL) { \
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63 size_t fs_ = sizeof (mp_digit) * (size_t)fd_; \
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64 MP_ZERO_BUFFER(fm_, fs_); \
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65 MP_FREE(fm_, fs_); \
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66 } \
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67 } while (0)
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68 #endif
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69
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70 #ifdef MP_USE_MEMSET
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71 # include <string.h>
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72 # define MP_ZERO_BUFFER(mem, size) memset((mem), 0, (size))
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73 # define MP_ZERO_DIGITS(mem, digits) \
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74 do { \
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75 int zd_ = (digits); \
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76 if (zd_ > 0) { \
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77 memset((mem), 0, sizeof(mp_digit) * (size_t)zd_); \
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78 } \
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79 } while (0)
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80 #else
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81 # define MP_ZERO_BUFFER(mem, size) \
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82 do { \
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83 size_t zs_ = (size); \
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84 char* zm_ = (char*)(mem); \
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85 while (zs_-- > 0u) { \
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86 *zm_++ = '\0'; \
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87 } \
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88 } while (0)
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89 # define MP_ZERO_DIGITS(mem, digits) \
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90 do { \
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91 int zd_ = (digits); \
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92 mp_digit* zm_ = (mem); \
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93 while (zd_-- > 0) { \
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94 *zm_++ = 0; \
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95 } \
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96 } while (0)
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97 #endif
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98
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99 /* Tunable cutoffs
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100 * ---------------
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101 *
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102 * - In the default settings, a cutoff X can be modified at runtime
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103 * by adjusting the corresponding X_CUTOFF variable.
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104 *
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105 * - Tunability of the library can be disabled at compile time
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106 * by defining the MP_FIXED_CUTOFFS macro.
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107 *
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108 * - There is an additional file tommath_cutoffs.h, which defines
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109 * the default cutoffs. These can be adjusted manually or by the
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110 * autotuner.
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111 *
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112 */
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113
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114 #ifdef MP_FIXED_CUTOFFS
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115 # include "tommath_cutoffs.h"
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116 # define MP_KARATSUBA_MUL_CUTOFF MP_DEFAULT_KARATSUBA_MUL_CUTOFF
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117 # define MP_KARATSUBA_SQR_CUTOFF MP_DEFAULT_KARATSUBA_SQR_CUTOFF
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118 # define MP_TOOM_MUL_CUTOFF MP_DEFAULT_TOOM_MUL_CUTOFF
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119 # define MP_TOOM_SQR_CUTOFF MP_DEFAULT_TOOM_SQR_CUTOFF
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120 #else
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121 # define MP_KARATSUBA_MUL_CUTOFF KARATSUBA_MUL_CUTOFF
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122 # define MP_KARATSUBA_SQR_CUTOFF KARATSUBA_SQR_CUTOFF
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123 # define MP_TOOM_MUL_CUTOFF TOOM_MUL_CUTOFF
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124 # define MP_TOOM_SQR_CUTOFF TOOM_SQR_CUTOFF
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125 #endif
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126
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127 /* define heap macros */
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128 #ifndef MP_MALLOC
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129 /* default to libc stuff */
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130 # include <stdlib.h>
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131 # define MP_MALLOC(size) malloc(size)
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132 # define MP_REALLOC(mem, oldsize, newsize) realloc((mem), (newsize))
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133 # define MP_CALLOC(nmemb, size) calloc((nmemb), (size))
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134 # define MP_FREE(mem, size) free(mem)
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135 #else
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136 /* prototypes for our heap functions */
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137 extern void *MP_MALLOC(size_t size);
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138 extern void *MP_REALLOC(void *mem, size_t oldsize, size_t newsize);
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139 extern void *MP_CALLOC(size_t nmemb, size_t size);
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140 extern void MP_FREE(void *mem, size_t size);
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141 #endif
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142
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143 /* feature detection macro */
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144 #ifdef _MSC_VER
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145 /* Prevent false positive: not enough arguments for function-like macro invocation */
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146 #pragma warning(disable: 4003)
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147 #endif
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148 #define MP_STRINGIZE(x) MP__STRINGIZE(x)
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149 #define MP__STRINGIZE(x) ""#x""
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150 #define MP_HAS(x) (sizeof(MP_STRINGIZE(BN_##x##_C)) == 1u)
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151
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152 /* TODO: Remove private_mp_word as soon as deprecated mp_word is removed from tommath. */
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153 #undef mp_word
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154 typedef private_mp_word mp_word;
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155
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156 #define MP_MIN(x, y) (((x) < (y)) ? (x) : (y))
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157 #define MP_MAX(x, y) (((x) > (y)) ? (x) : (y))
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158
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159 /* Static assertion */
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160 #define MP_STATIC_ASSERT(msg, cond) typedef char mp_static_assert_##msg[(cond) ? 1 : -1];
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161
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162 /* ---> Basic Manipulations <--- */
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163 #define MP_IS_ZERO(a) ((a)->used == 0)
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164 #define MP_IS_EVEN(a) (((a)->used == 0) || (((a)->dp[0] & 1u) == 0u))
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165 #define MP_IS_ODD(a) (((a)->used > 0) && (((a)->dp[0] & 1u) == 1u))
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166
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167 #define MP_SIZEOF_BITS(type) ((size_t)CHAR_BIT * sizeof(type))
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168 #define MP_MAXFAST (int)(1uL << (MP_SIZEOF_BITS(mp_word) - (2u * (size_t)MP_DIGIT_BIT)))
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169
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170 /* TODO: Remove PRIVATE_MP_WARRAY as soon as deprecated MP_WARRAY is removed from tommath.h */
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171 #undef MP_WARRAY
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172 #define MP_WARRAY PRIVATE_MP_WARRAY
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173
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174 /* TODO: Remove PRIVATE_MP_PREC as soon as deprecated MP_PREC is removed from tommath.h */
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175 #ifdef PRIVATE_MP_PREC
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176 # undef MP_PREC
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177 # define MP_PREC PRIVATE_MP_PREC
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178 #endif
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179
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180 /* Minimum number of available digits in mp_int, MP_PREC >= MP_MIN_PREC */
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181 #define MP_MIN_PREC ((((int)MP_SIZEOF_BITS(long long) + MP_DIGIT_BIT) - 1) / MP_DIGIT_BIT)
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182
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183 MP_STATIC_ASSERT(prec_geq_min_prec, MP_PREC >= MP_MIN_PREC)
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184
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185 /* random number source */
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186 extern MP_PRIVATE mp_err(*s_mp_rand_source)(void *out, size_t size);
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187
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188 /* lowlevel functions, do not call! */
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189 MP_PRIVATE mp_bool s_mp_get_bit(const mp_int *a, unsigned int b);
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190 MP_PRIVATE mp_err s_mp_add(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
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191 MP_PRIVATE mp_err s_mp_sub(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
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192 MP_PRIVATE mp_err s_mp_mul_digs_fast(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
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193 MP_PRIVATE mp_err s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
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194 MP_PRIVATE mp_err s_mp_mul_high_digs_fast(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
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195 MP_PRIVATE mp_err s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs) MP_WUR;
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196 MP_PRIVATE mp_err s_mp_sqr_fast(const mp_int *a, mp_int *b) MP_WUR;
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197 MP_PRIVATE mp_err s_mp_sqr(const mp_int *a, mp_int *b) MP_WUR;
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198 MP_PRIVATE mp_err s_mp_balance_mul(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
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199 MP_PRIVATE mp_err s_mp_karatsuba_mul(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
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200 MP_PRIVATE mp_err s_mp_toom_mul(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
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201 MP_PRIVATE mp_err s_mp_karatsuba_sqr(const mp_int *a, mp_int *b) MP_WUR;
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202 MP_PRIVATE mp_err s_mp_toom_sqr(const mp_int *a, mp_int *b) MP_WUR;
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203 MP_PRIVATE mp_err s_mp_invmod_fast(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
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204 MP_PRIVATE mp_err s_mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c) MP_WUR;
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205 MP_PRIVATE mp_err s_mp_montgomery_reduce_fast(mp_int *x, const mp_int *n, mp_digit rho) MP_WUR;
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206 MP_PRIVATE mp_err s_mp_exptmod_fast(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode) MP_WUR;
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207 MP_PRIVATE mp_err s_mp_exptmod(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode) MP_WUR;
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208 MP_PRIVATE mp_err s_mp_rand_platform(void *p, size_t n) MP_WUR;
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209 MP_PRIVATE mp_err s_mp_prime_random_ex(mp_int *a, int t, int size, int flags, private_mp_prime_callback cb, void *dat);
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210 MP_PRIVATE void s_mp_reverse(unsigned char *s, size_t len);
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211 MP_PRIVATE mp_err s_mp_prime_is_divisible(const mp_int *a, mp_bool *result);
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212
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213 /* TODO: jenkins prng is not thread safe as of now */
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214 MP_PRIVATE mp_err s_mp_rand_jenkins(void *p, size_t n) MP_WUR;
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215 MP_PRIVATE void s_mp_rand_jenkins_init(uint64_t seed);
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216
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217 extern MP_PRIVATE const char *const mp_s_rmap;
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218 extern MP_PRIVATE const uint8_t mp_s_rmap_reverse[];
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219 extern MP_PRIVATE const size_t mp_s_rmap_reverse_sz;
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220 extern MP_PRIVATE const mp_digit *s_mp_prime_tab;
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221
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222 /* deprecated functions */
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223 MP_DEPRECATED(s_mp_invmod_fast) mp_err fast_mp_invmod(const mp_int *a, const mp_int *b, mp_int *c);
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224 MP_DEPRECATED(s_mp_montgomery_reduce_fast) mp_err fast_mp_montgomery_reduce(mp_int *x, const mp_int *n,
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225 mp_digit rho);
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226 MP_DEPRECATED(s_mp_mul_digs_fast) mp_err fast_s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c,
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227 int digs);
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228 MP_DEPRECATED(s_mp_mul_high_digs_fast) mp_err fast_s_mp_mul_high_digs(const mp_int *a, const mp_int *b,
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229 mp_int *c,
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230 int digs);
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231 MP_DEPRECATED(s_mp_sqr_fast) mp_err fast_s_mp_sqr(const mp_int *a, mp_int *b);
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232 MP_DEPRECATED(s_mp_balance_mul) mp_err mp_balance_mul(const mp_int *a, const mp_int *b, mp_int *c);
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233 MP_DEPRECATED(s_mp_exptmod_fast) mp_err mp_exptmod_fast(const mp_int *G, const mp_int *X, const mp_int *P,
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234 mp_int *Y,
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235 int redmode);
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236 MP_DEPRECATED(s_mp_invmod_slow) mp_err mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c);
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237 MP_DEPRECATED(s_mp_karatsuba_mul) mp_err mp_karatsuba_mul(const mp_int *a, const mp_int *b, mp_int *c);
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238 MP_DEPRECATED(s_mp_karatsuba_sqr) mp_err mp_karatsuba_sqr(const mp_int *a, mp_int *b);
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239 MP_DEPRECATED(s_mp_toom_mul) mp_err mp_toom_mul(const mp_int *a, const mp_int *b, mp_int *c);
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240 MP_DEPRECATED(s_mp_toom_sqr) mp_err mp_toom_sqr(const mp_int *a, mp_int *b);
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241 MP_DEPRECATED(s_mp_reverse) void bn_reverse(unsigned char *s, int len);
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242
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243 #define MP_GET_ENDIANNESS(x) \
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244 do{\
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245 int16_t n = 0x1; \
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246 char *p = (char *)&n; \
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247 x = (p[0] == '\x01') ? MP_LITTLE_ENDIAN : MP_BIG_ENDIAN; \
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248 } while (0)
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249
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250 /* code-generating macros */
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251 #define MP_SET_UNSIGNED(name, type) \
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252 void name(mp_int * a, type b) \
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253 { \
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254 int i = 0; \
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255 while (b != 0u) { \
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256 a->dp[i++] = ((mp_digit)b & MP_MASK); \
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257 if (MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) { break; } \
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258 b >>= ((MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) ? 0 : MP_DIGIT_BIT); \
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259 } \
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260 a->used = i; \
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261 a->sign = MP_ZPOS; \
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262 MP_ZERO_DIGITS(a->dp + a->used, a->alloc - a->used); \
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263 }
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264
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265 #define MP_SET_SIGNED(name, uname, type, utype) \
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266 void name(mp_int * a, type b) \
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267 { \
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268 uname(a, (b < 0) ? -(utype)b : (utype)b); \
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269 if (b < 0) { a->sign = MP_NEG; } \
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270 }
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271
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272 #define MP_INIT_INT(name , set, type) \
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273 mp_err name(mp_int * a, type b) \
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274 { \
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275 mp_err err; \
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276 if ((err = mp_init(a)) != MP_OKAY) { \
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277 return err; \
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278 } \
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279 set(a, b); \
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280 return MP_OKAY; \
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281 }
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282
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283 #define MP_GET_MAG(name, type) \
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284 type name(const mp_int* a) \
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285 { \
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286 unsigned i = MP_MIN((unsigned)a->used, (unsigned)((MP_SIZEOF_BITS(type) + MP_DIGIT_BIT - 1) / MP_DIGIT_BIT)); \
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287 type res = 0u; \
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288 while (i --> 0u) { \
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289 res <<= ((MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) ? 0 : MP_DIGIT_BIT); \
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290 res |= (type)a->dp[i]; \
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291 if (MP_SIZEOF_BITS(type) <= MP_DIGIT_BIT) { break; } \
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292 } \
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293 return res; \
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294 }
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295
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296 #define MP_GET_SIGNED(name, mag, type, utype) \
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297 type name(const mp_int* a) \
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298 { \
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299 utype res = mag(a); \
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300 return (a->sign == MP_NEG) ? (type)-res : (type)res; \
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301 }
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302
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303 #endif