Mercurial > dropbear
annotate libtomcrypt/src/headers/tomcrypt_math.h @ 1459:06d52bcb8094
Pointer parameter could be declared as pointing to const
author | Francois Perrad <francois.perrad@gadz.org> |
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date | Sat, 19 Aug 2017 17:16:13 +0200 |
parents | f849a5ca2efc |
children | 6dba84798cd5 |
rev | line source |
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382
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1 /** math functions **/ |
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2 |
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3 #define LTC_MP_LT -1 |
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4 #define LTC_MP_EQ 0 |
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5 #define LTC_MP_GT 1 |
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6 |
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7 #define LTC_MP_NO 0 |
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8 #define LTC_MP_YES 1 |
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9 |
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10 #ifndef LTC_MECC |
382
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11 typedef void ecc_point; |
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12 #endif |
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13 |
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14 #ifndef LTC_MRSA |
382
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15 typedef void rsa_key; |
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16 #endif |
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17 |
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18 /** math descriptor */ |
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19 typedef struct { |
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20 /** Name of the math provider */ |
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21 char *name; |
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22 |
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23 /** Bits per digit, amount of bits must fit in an unsigned long */ |
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24 int bits_per_digit; |
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25 |
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26 /* ---- init/deinit functions ---- */ |
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27 |
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28 /** initialize a bignum |
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29 @param a The number to initialize |
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30 @return CRYPT_OK on success |
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31 */ |
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32 int (*init)(void **a); |
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33 |
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34 /** init copy |
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35 @param dst The number to initialize and write to |
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36 @param src The number to copy from |
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37 @return CRYPT_OK on success |
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38 */ |
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39 int (*init_copy)(void **dst, void *src); |
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40 |
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41 /** deinit |
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42 @param a The number to free |
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43 @return CRYPT_OK on success |
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44 */ |
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45 void (*deinit)(void *a); |
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46 |
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47 /* ---- data movement ---- */ |
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48 |
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49 /** negate |
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50 @param src The number to negate |
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51 @param dst The destination |
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52 @return CRYPT_OK on success |
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53 */ |
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54 int (*neg)(void *src, void *dst); |
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55 |
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56 /** copy |
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57 @param src The number to copy from |
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58 @param dst The number to write to |
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59 @return CRYPT_OK on success |
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60 */ |
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61 int (*copy)(void *src, void *dst); |
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62 |
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63 /* ---- trivial low level functions ---- */ |
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64 |
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65 /** set small constant |
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66 @param a Number to write to |
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67 @param n Source upto bits_per_digit (actually meant for very small constants) |
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68 @return CRYPT_OK on succcess |
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69 */ |
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70 int (*set_int)(void *a, unsigned long n); |
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71 |
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72 /** get small constant |
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73 @param a Number to read, only fetches upto bits_per_digit from the number |
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74 @return The lower bits_per_digit of the integer (unsigned) |
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75 */ |
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76 unsigned long (*get_int)(void *a); |
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77 |
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78 /** get digit n |
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79 @param a The number to read from |
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80 @param n The number of the digit to fetch |
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81 @return The bits_per_digit sized n'th digit of a |
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82 */ |
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83 unsigned long (*get_digit)(void *a, int n); |
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84 |
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85 /** Get the number of digits that represent the number |
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86 @param a The number to count |
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87 @return The number of digits used to represent the number |
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88 */ |
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89 int (*get_digit_count)(void *a); |
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90 |
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91 /** compare two integers |
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92 @param a The left side integer |
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93 @param b The right side integer |
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94 @return LTC_MP_LT if a < b, LTC_MP_GT if a > b and LTC_MP_EQ otherwise. (signed comparison) |
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95 */ |
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96 int (*compare)(void *a, void *b); |
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97 |
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98 /** compare against int |
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99 @param a The left side integer |
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100 @param b The right side integer (upto bits_per_digit) |
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101 @return LTC_MP_LT if a < b, LTC_MP_GT if a > b and LTC_MP_EQ otherwise. (signed comparison) |
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102 */ |
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103 int (*compare_d)(void *a, unsigned long n); |
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104 |
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105 /** Count the number of bits used to represent the integer |
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106 @param a The integer to count |
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107 @return The number of bits required to represent the integer |
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108 */ |
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109 int (*count_bits)(void * a); |
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110 |
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111 /** Count the number of LSB bits which are zero |
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112 @param a The integer to count |
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113 @return The number of contiguous zero LSB bits |
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114 */ |
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115 int (*count_lsb_bits)(void *a); |
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116 |
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117 /** Compute a power of two |
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118 @param a The integer to store the power in |
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119 @param n The power of two you want to store (a = 2^n) |
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120 @return CRYPT_OK on success |
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121 */ |
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122 int (*twoexpt)(void *a , int n); |
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123 |
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124 /* ---- radix conversions ---- */ |
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125 |
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126 /** read ascii string |
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127 @param a The integer to store into |
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128 @param str The string to read |
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129 @param radix The radix the integer has been represented in (2-64) |
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130 @return CRYPT_OK on success |
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131 */ |
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132 int (*read_radix)(void *a, const char *str, int radix); |
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133 |
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134 /** write number to string |
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135 @param a The integer to store |
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136 @param str The destination for the string |
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137 @param radix The radix the integer is to be represented in (2-64) |
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138 @return CRYPT_OK on success |
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139 */ |
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140 int (*write_radix)(void *a, char *str, int radix); |
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141 |
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142 /** get size as unsigned char string |
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143 @param a The integer to get the size (when stored in array of octets) |
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144 @return The length of the integer |
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145 */ |
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146 unsigned long (*unsigned_size)(void *a); |
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147 |
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148 /** store an integer as an array of octets |
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149 @param src The integer to store |
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150 @param dst The buffer to store the integer in |
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151 @return CRYPT_OK on success |
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152 */ |
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153 int (*unsigned_write)(void *src, unsigned char *dst); |
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154 |
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155 /** read an array of octets and store as integer |
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156 @param dst The integer to load |
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157 @param src The array of octets |
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158 @param len The number of octets |
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159 @return CRYPT_OK on success |
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160 */ |
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161 int (*unsigned_read)(void *dst, unsigned char *src, unsigned long len); |
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162 |
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163 /* ---- basic math ---- */ |
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164 |
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165 /** add two integers |
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166 @param a The first source integer |
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167 @param b The second source integer |
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168 @param c The destination of "a + b" |
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169 @return CRYPT_OK on success |
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170 */ |
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171 int (*add)(void *a, void *b, void *c); |
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172 |
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173 |
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174 /** add two integers |
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175 @param a The first source integer |
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176 @param b The second source integer (single digit of upto bits_per_digit in length) |
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177 @param c The destination of "a + b" |
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178 @return CRYPT_OK on success |
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179 */ |
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180 int (*addi)(void *a, unsigned long b, void *c); |
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181 |
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182 /** subtract two integers |
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183 @param a The first source integer |
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184 @param b The second source integer |
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185 @param c The destination of "a - b" |
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186 @return CRYPT_OK on success |
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187 */ |
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188 int (*sub)(void *a, void *b, void *c); |
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189 |
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190 /** subtract two integers |
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191 @param a The first source integer |
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192 @param b The second source integer (single digit of upto bits_per_digit in length) |
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193 @param c The destination of "a - b" |
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194 @return CRYPT_OK on success |
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195 */ |
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196 int (*subi)(void *a, unsigned long b, void *c); |
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197 |
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198 /** multiply two integers |
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199 @param a The first source integer |
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200 @param b The second source integer (single digit of upto bits_per_digit in length) |
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201 @param c The destination of "a * b" |
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202 @return CRYPT_OK on success |
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203 */ |
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204 int (*mul)(void *a, void *b, void *c); |
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205 |
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206 /** multiply two integers |
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207 @param a The first source integer |
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208 @param b The second source integer (single digit of upto bits_per_digit in length) |
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209 @param c The destination of "a * b" |
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210 @return CRYPT_OK on success |
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211 */ |
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212 int (*muli)(void *a, unsigned long b, void *c); |
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213 |
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214 /** Square an integer |
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215 @param a The integer to square |
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216 @param b The destination |
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217 @return CRYPT_OK on success |
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218 */ |
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219 int (*sqr)(void *a, void *b); |
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220 |
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221 /** Divide an integer |
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222 @param a The dividend |
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223 @param b The divisor |
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224 @param c The quotient (can be NULL to signify don't care) |
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225 @param d The remainder (can be NULL to signify don't care) |
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226 @return CRYPT_OK on success |
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227 */ |
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228 int (*mpdiv)(void *a, void *b, void *c, void *d); |
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229 |
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230 /** divide by two |
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231 @param a The integer to divide (shift right) |
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232 @param b The destination |
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233 @return CRYPT_OK on success |
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234 */ |
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235 int (*div_2)(void *a, void *b); |
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236 |
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237 /** Get remainder (small value) |
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238 @param a The integer to reduce |
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239 @param b The modulus (upto bits_per_digit in length) |
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240 @param c The destination for the residue |
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241 @return CRYPT_OK on success |
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242 */ |
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243 int (*modi)(void *a, unsigned long b, unsigned long *c); |
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244 |
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245 /** gcd |
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246 @param a The first integer |
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247 @param b The second integer |
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248 @param c The destination for (a, b) |
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249 @return CRYPT_OK on success |
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250 */ |
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251 int (*gcd)(void *a, void *b, void *c); |
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252 |
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253 /** lcm |
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254 @param a The first integer |
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255 @param b The second integer |
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256 @param c The destination for [a, b] |
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257 @return CRYPT_OK on success |
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258 */ |
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259 int (*lcm)(void *a, void *b, void *c); |
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260 |
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261 /** Modular multiplication |
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262 @param a The first source |
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263 @param b The second source |
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264 @param c The modulus |
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265 @param d The destination (a*b mod c) |
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266 @return CRYPT_OK on success |
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267 */ |
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268 int (*mulmod)(void *a, void *b, void *c, void *d); |
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269 |
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270 /** Modular squaring |
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271 @param a The first source |
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272 @param b The modulus |
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273 @param c The destination (a*a mod b) |
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274 @return CRYPT_OK on success |
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275 */ |
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276 int (*sqrmod)(void *a, void *b, void *c); |
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277 |
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278 /** Modular inversion |
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279 @param a The value to invert |
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280 @param b The modulus |
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281 @param c The destination (1/a mod b) |
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282 @return CRYPT_OK on success |
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283 */ |
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284 int (*invmod)(void *, void *, void *); |
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285 |
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286 /* ---- reduction ---- */ |
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287 |
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288 /** setup montgomery |
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289 @param a The modulus |
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290 @param b The destination for the reduction digit |
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291 @return CRYPT_OK on success |
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292 */ |
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293 int (*montgomery_setup)(void *a, void **b); |
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294 |
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295 /** get normalization value |
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296 @param a The destination for the normalization value |
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297 @param b The modulus |
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298 @return CRYPT_OK on success |
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299 */ |
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300 int (*montgomery_normalization)(void *a, void *b); |
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301 |
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302 /** reduce a number |
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303 @param a The number [and dest] to reduce |
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304 @param b The modulus |
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305 @param c The value "b" from montgomery_setup() |
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306 @return CRYPT_OK on success |
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307 */ |
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308 int (*montgomery_reduce)(void *a, void *b, void *c); |
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309 |
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310 /** clean up (frees memory) |
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311 @param a The value "b" from montgomery_setup() |
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312 @return CRYPT_OK on success |
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313 */ |
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314 void (*montgomery_deinit)(void *a); |
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315 |
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316 /* ---- exponentiation ---- */ |
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317 |
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318 /** Modular exponentiation |
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319 @param a The base integer |
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320 @param b The power (can be negative) integer |
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321 @param c The modulus integer |
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322 @param d The destination |
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323 @return CRYPT_OK on success |
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324 */ |
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325 int (*exptmod)(void *a, void *b, void *c, void *d); |
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326 |
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327 /** Primality testing |
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328 @param a The integer to test |
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329 @param b The destination of the result (FP_YES if prime) |
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330 @return CRYPT_OK on success |
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331 */ |
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332 int (*isprime)(void *a, int *b); |
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333 |
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334 /* ---- (optional) ecc point math ---- */ |
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335 |
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336 /** ECC GF(p) point multiplication (from the NIST curves) |
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337 @param k The integer to multiply the point by |
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338 @param G The point to multiply |
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339 @param R The destination for kG |
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340 @param modulus The modulus for the field |
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341 @param map Boolean indicated whether to map back to affine or not (can be ignored if you work in affine only) |
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342 @return CRYPT_OK on success |
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343 */ |
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344 int (*ecc_ptmul)(void *k, ecc_point *G, ecc_point *R, void *modulus, int map); |
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345 |
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346 /** ECC GF(p) point addition |
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347 @param P The first point |
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348 @param Q The second point |
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349 @param R The destination of P + Q |
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350 @param modulus The modulus |
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351 @param mp The "b" value from montgomery_setup() |
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352 @return CRYPT_OK on success |
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353 */ |
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354 int (*ecc_ptadd)(ecc_point *P, ecc_point *Q, ecc_point *R, void *modulus, void *mp); |
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355 |
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356 /** ECC GF(p) point double |
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357 @param P The first point |
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358 @param R The destination of 2P |
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359 @param modulus The modulus |
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360 @param mp The "b" value from montgomery_setup() |
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361 @return CRYPT_OK on success |
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362 */ |
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363 int (*ecc_ptdbl)(ecc_point *P, ecc_point *R, void *modulus, void *mp); |
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364 |
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365 /** ECC mapping from projective to affine, currently uses (x,y,z) => (x/z^2, y/z^3, 1) |
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366 @param P The point to map |
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367 @param modulus The modulus |
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368 @param mp The "b" value from montgomery_setup() |
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369 @return CRYPT_OK on success |
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370 @remark The mapping can be different but keep in mind a ecc_point only has three |
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371 integers (x,y,z) so if you use a different mapping you have to make it fit. |
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372 */ |
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373 int (*ecc_map)(ecc_point *P, void *modulus, void *mp); |
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374 |
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375 /** Computes kA*A + kB*B = C using Shamir's Trick |
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376 @param A First point to multiply |
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377 @param kA What to multiple A by |
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378 @param B Second point to multiply |
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379 @param kB What to multiple B by |
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380 @param C [out] Destination point (can overlap with A or B |
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381 @param modulus Modulus for curve |
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382 @return CRYPT_OK on success |
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383 */ |
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384 int (*ecc_mul2add)(ecc_point *A, void *kA, |
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385 ecc_point *B, void *kB, |
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386 ecc_point *C, |
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387 void *modulus); |
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388 |
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389 /* ---- (optional) rsa optimized math (for internal CRT) ---- */ |
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390 |
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391 /** RSA Key Generation |
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392 @param prng An active PRNG state |
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393 @param wprng The index of the PRNG desired |
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394 @param size The size of the modulus (key size) desired (octets) |
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395 @param e The "e" value (public key). e==65537 is a good choice |
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396 @param key [out] Destination of a newly created private key pair |
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397 @return CRYPT_OK if successful, upon error all allocated ram is freed |
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398 */ |
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399 int (*rsa_keygen)(prng_state *prng, int wprng, int size, long e, rsa_key *key); |
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400 |
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401 |
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402 /** RSA exponentiation |
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403 @param in The octet array representing the base |
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Matt Johnston <matt@ucc.asn.au>
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404 @param inlen The length of the input |
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Matt Johnston <matt@ucc.asn.au>
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405 @param out The destination (to be stored in an octet array format) |
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Matt Johnston <matt@ucc.asn.au>
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406 @param outlen The length of the output buffer and the resulting size (zero padded to the size of the modulus) |
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Matt Johnston <matt@ucc.asn.au>
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407 @param which PK_PUBLIC for public RSA and PK_PRIVATE for private RSA |
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408 @param key The RSA key to use |
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409 @return CRYPT_OK on success |
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Matt Johnston <matt@ucc.asn.au>
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410 */ |
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Matt Johnston <matt@ucc.asn.au>
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411 int (*rsa_me)(const unsigned char *in, unsigned long inlen, |
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412 unsigned char *out, unsigned long *outlen, int which, |
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413 rsa_key *key); |
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Matt Johnston <matt@ucc.asn.au>
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414 } ltc_math_descriptor; |
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415 |
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Matt Johnston <matt@ucc.asn.au>
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416 extern ltc_math_descriptor ltc_mp; |
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417 |
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418 int ltc_init_multi(void **a, ...); |
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419 void ltc_deinit_multi(void *a, ...); |
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Matt Johnston <matt@ucc.asn.au>
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420 |
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421 #ifdef LTM_DESC |
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422 extern const ltc_math_descriptor ltm_desc; |
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423 #endif |
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424 |
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425 #ifdef TFM_DESC |
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426 extern const ltc_math_descriptor tfm_desc; |
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427 #endif |
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428 |
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429 #ifdef GMP_DESC |
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430 extern const ltc_math_descriptor gmp_desc; |
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431 #endif |
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432 |
0cbe8f6dbf9e
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433 #if !defined(DESC_DEF_ONLY) && defined(LTC_SOURCE) |
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434 |
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435 #define MP_DIGIT_BIT ltc_mp.bits_per_digit |
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436 |
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Matt Johnston <matt@ucc.asn.au>
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437 /* some handy macros */ |
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438 #define mp_init(a) ltc_mp.init(a) |
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Matt Johnston <matt@ucc.asn.au>
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439 #define mp_init_multi ltc_init_multi |
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Matt Johnston <matt@ucc.asn.au>
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440 #define mp_clear(a) ltc_mp.deinit(a) |
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Matt Johnston <matt@ucc.asn.au>
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441 #define mp_clear_multi ltc_deinit_multi |
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442 #define mp_init_copy(a, b) ltc_mp.init_copy(a, b) |
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443 |
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Matt Johnston <matt@ucc.asn.au>
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444 #define mp_neg(a, b) ltc_mp.neg(a, b) |
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Matt Johnston <matt@ucc.asn.au>
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445 #define mp_copy(a, b) ltc_mp.copy(a, b) |
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446 |
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Matt Johnston <matt@ucc.asn.au>
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447 #define mp_set(a, b) ltc_mp.set_int(a, b) |
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Matt Johnston <matt@ucc.asn.au>
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448 #define mp_set_int(a, b) ltc_mp.set_int(a, b) |
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Matt Johnston <matt@ucc.asn.au>
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449 #define mp_get_int(a) ltc_mp.get_int(a) |
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Matt Johnston <matt@ucc.asn.au>
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450 #define mp_get_digit(a, n) ltc_mp.get_digit(a, n) |
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Matt Johnston <matt@ucc.asn.au>
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451 #define mp_get_digit_count(a) ltc_mp.get_digit_count(a) |
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Matt Johnston <matt@ucc.asn.au>
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452 #define mp_cmp(a, b) ltc_mp.compare(a, b) |
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Matt Johnston <matt@ucc.asn.au>
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453 #define mp_cmp_d(a, b) ltc_mp.compare_d(a, b) |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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454 #define mp_count_bits(a) ltc_mp.count_bits(a) |
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Matt Johnston <matt@ucc.asn.au>
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455 #define mp_cnt_lsb(a) ltc_mp.count_lsb_bits(a) |
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Matt Johnston <matt@ucc.asn.au>
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456 #define mp_2expt(a, b) ltc_mp.twoexpt(a, b) |
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457 |
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Matt Johnston <matt@ucc.asn.au>
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458 #define mp_read_radix(a, b, c) ltc_mp.read_radix(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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459 #define mp_toradix(a, b, c) ltc_mp.write_radix(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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diff
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460 #define mp_unsigned_bin_size(a) ltc_mp.unsigned_size(a) |
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Matt Johnston <matt@ucc.asn.au>
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diff
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461 #define mp_to_unsigned_bin(a, b) ltc_mp.unsigned_write(a, b) |
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Matt Johnston <matt@ucc.asn.au>
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462 #define mp_read_unsigned_bin(a, b, c) ltc_mp.unsigned_read(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
463 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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464 #define mp_add(a, b, c) ltc_mp.add(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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465 #define mp_add_d(a, b, c) ltc_mp.addi(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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466 #define mp_sub(a, b, c) ltc_mp.sub(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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467 #define mp_sub_d(a, b, c) ltc_mp.subi(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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468 #define mp_mul(a, b, c) ltc_mp.mul(a, b, c) |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
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469 #define mp_mul_d(a, b, c) ltc_mp.muli(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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470 #define mp_sqr(a, b) ltc_mp.sqr(a, b) |
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Matt Johnston <matt@ucc.asn.au>
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471 #define mp_div(a, b, c, d) ltc_mp.mpdiv(a, b, c, d) |
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Matt Johnston <matt@ucc.asn.au>
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472 #define mp_div_2(a, b) ltc_mp.div_2(a, b) |
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Matt Johnston <matt@ucc.asn.au>
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473 #define mp_mod(a, b, c) ltc_mp.mpdiv(a, b, NULL, c) |
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Matt Johnston <matt@ucc.asn.au>
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474 #define mp_mod_d(a, b, c) ltc_mp.modi(a, b, c) |
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Matt Johnston <matt@ucc.asn.au>
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475 #define mp_gcd(a, b, c) ltc_mp.gcd(a, b, c) |
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476 #define mp_lcm(a, b, c) ltc_mp.lcm(a, b, c) |
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477 |
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478 #define mp_mulmod(a, b, c, d) ltc_mp.mulmod(a, b, c, d) |
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479 #define mp_sqrmod(a, b, c) ltc_mp.sqrmod(a, b, c) |
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480 #define mp_invmod(a, b, c) ltc_mp.invmod(a, b, c) |
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481 |
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482 #define mp_montgomery_setup(a, b) ltc_mp.montgomery_setup(a, b) |
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483 #define mp_montgomery_normalization(a, b) ltc_mp.montgomery_normalization(a, b) |
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484 #define mp_montgomery_reduce(a, b, c) ltc_mp.montgomery_reduce(a, b, c) |
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485 #define mp_montgomery_free(a) ltc_mp.montgomery_deinit(a) |
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486 |
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487 #define mp_exptmod(a,b,c,d) ltc_mp.exptmod(a,b,c,d) |
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488 #define mp_prime_is_prime(a, b, c) ltc_mp.isprime(a, c) |
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489 |
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490 #define mp_iszero(a) (mp_cmp_d(a, 0) == LTC_MP_EQ ? LTC_MP_YES : LTC_MP_NO) |
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491 #define mp_isodd(a) (mp_get_digit_count(a) > 0 ? (mp_get_digit(a, 0) & 1 ? LTC_MP_YES : LTC_MP_NO) : LTC_MP_NO) |
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492 #define mp_exch(a, b) do { void *ABC__tmp = a; a = b; b = ABC__tmp; } while(0); |
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493 |
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494 #define mp_tohex(a, b) mp_toradix(a, b, 16) |
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495 |
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496 #endif |
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497 |
1435
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498 /* $Source$ */ |
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499 /* $Revision$ */ |
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500 /* $Date$ */ |