1 | /*
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2 | * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | /* ====================================================================
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11 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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12 | * Portions of this software developed by SUN MICROSYSTEMS, INC.,
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13 | * and contributed to the OpenSSL project.
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14 | */
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15 |
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16 | #include <openssl/err.h>
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17 |
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18 | #include "ec_lcl.h"
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19 |
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20 | const EC_METHOD *EC_GFp_mont_method(void)
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21 | {
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22 | static const EC_METHOD ret = {
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23 | EC_FLAGS_DEFAULT_OCT,
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24 | NID_X9_62_prime_field,
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25 | ec_GFp_mont_group_init,
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26 | ec_GFp_mont_group_finish,
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27 | ec_GFp_mont_group_clear_finish,
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28 | ec_GFp_mont_group_copy,
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29 | ec_GFp_mont_group_set_curve,
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30 | ec_GFp_simple_group_get_curve,
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31 | ec_GFp_simple_group_get_degree,
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32 | ec_group_simple_order_bits,
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33 | ec_GFp_simple_group_check_discriminant,
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34 | ec_GFp_simple_point_init,
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35 | ec_GFp_simple_point_finish,
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36 | ec_GFp_simple_point_clear_finish,
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37 | ec_GFp_simple_point_copy,
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38 | ec_GFp_simple_point_set_to_infinity,
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39 | ec_GFp_simple_set_Jprojective_coordinates_GFp,
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40 | ec_GFp_simple_get_Jprojective_coordinates_GFp,
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41 | ec_GFp_simple_point_set_affine_coordinates,
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42 | ec_GFp_simple_point_get_affine_coordinates,
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43 | 0, 0, 0,
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44 | ec_GFp_simple_add,
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45 | ec_GFp_simple_dbl,
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46 | ec_GFp_simple_invert,
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47 | ec_GFp_simple_is_at_infinity,
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48 | ec_GFp_simple_is_on_curve,
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49 | ec_GFp_simple_cmp,
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50 | ec_GFp_simple_make_affine,
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51 | ec_GFp_simple_points_make_affine,
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52 | 0 /* mul */ ,
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53 | 0 /* precompute_mult */ ,
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54 | 0 /* have_precompute_mult */ ,
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55 | ec_GFp_mont_field_mul,
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56 | ec_GFp_mont_field_sqr,
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57 | 0 /* field_div */ ,
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58 | ec_GFp_mont_field_encode,
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59 | ec_GFp_mont_field_decode,
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60 | ec_GFp_mont_field_set_to_one,
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61 | ec_key_simple_priv2oct,
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62 | ec_key_simple_oct2priv,
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63 | 0, /* set private */
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64 | ec_key_simple_generate_key,
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65 | ec_key_simple_check_key,
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66 | ec_key_simple_generate_public_key,
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67 | 0, /* keycopy */
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68 | 0, /* keyfinish */
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69 | ecdh_simple_compute_key
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70 | };
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71 |
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72 | return &ret;
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73 | }
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74 |
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75 | int ec_GFp_mont_group_init(EC_GROUP *group)
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76 | {
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77 | int ok;
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78 |
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79 | ok = ec_GFp_simple_group_init(group);
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80 | group->field_data1 = NULL;
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81 | group->field_data2 = NULL;
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82 | return ok;
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83 | }
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84 |
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85 | void ec_GFp_mont_group_finish(EC_GROUP *group)
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86 | {
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87 | BN_MONT_CTX_free(group->field_data1);
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88 | group->field_data1 = NULL;
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89 | BN_free(group->field_data2);
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90 | group->field_data2 = NULL;
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91 | ec_GFp_simple_group_finish(group);
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92 | }
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93 |
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94 | void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
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95 | {
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96 | BN_MONT_CTX_free(group->field_data1);
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97 | group->field_data1 = NULL;
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98 | BN_clear_free(group->field_data2);
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99 | group->field_data2 = NULL;
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100 | ec_GFp_simple_group_clear_finish(group);
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101 | }
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102 |
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103 | int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
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104 | {
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105 | BN_MONT_CTX_free(dest->field_data1);
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106 | dest->field_data1 = NULL;
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107 | BN_clear_free(dest->field_data2);
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108 | dest->field_data2 = NULL;
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109 |
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110 | if (!ec_GFp_simple_group_copy(dest, src))
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111 | return 0;
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112 |
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113 | if (src->field_data1 != NULL) {
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114 | dest->field_data1 = BN_MONT_CTX_new();
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115 | if (dest->field_data1 == NULL)
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116 | return 0;
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117 | if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1))
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118 | goto err;
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119 | }
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120 | if (src->field_data2 != NULL) {
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121 | dest->field_data2 = BN_dup(src->field_data2);
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122 | if (dest->field_data2 == NULL)
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123 | goto err;
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124 | }
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125 |
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126 | return 1;
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127 |
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128 | err:
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129 | BN_MONT_CTX_free(dest->field_data1);
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130 | dest->field_data1 = NULL;
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131 | return 0;
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132 | }
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133 |
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134 | int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p,
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135 | const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
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136 | {
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137 | BN_CTX *new_ctx = NULL;
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138 | BN_MONT_CTX *mont = NULL;
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139 | BIGNUM *one = NULL;
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140 | int ret = 0;
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141 |
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142 | BN_MONT_CTX_free(group->field_data1);
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143 | group->field_data1 = NULL;
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144 | BN_free(group->field_data2);
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145 | group->field_data2 = NULL;
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146 |
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147 | if (ctx == NULL) {
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148 | ctx = new_ctx = BN_CTX_new();
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149 | if (ctx == NULL)
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150 | return 0;
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151 | }
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152 |
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153 | mont = BN_MONT_CTX_new();
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154 | if (mont == NULL)
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155 | goto err;
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156 | if (!BN_MONT_CTX_set(mont, p, ctx)) {
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157 | ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
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158 | goto err;
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159 | }
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160 | one = BN_new();
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161 | if (one == NULL)
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162 | goto err;
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163 | if (!BN_to_montgomery(one, BN_value_one(), mont, ctx))
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164 | goto err;
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165 |
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166 | group->field_data1 = mont;
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167 | mont = NULL;
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168 | group->field_data2 = one;
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169 | one = NULL;
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170 |
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171 | ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
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172 |
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173 | if (!ret) {
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174 | BN_MONT_CTX_free(group->field_data1);
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175 | group->field_data1 = NULL;
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176 | BN_free(group->field_data2);
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177 | group->field_data2 = NULL;
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178 | }
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179 |
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180 | err:
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181 | BN_free(one);
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182 | BN_CTX_free(new_ctx);
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183 | BN_MONT_CTX_free(mont);
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184 | return ret;
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185 | }
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186 |
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187 | int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
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188 | const BIGNUM *b, BN_CTX *ctx)
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189 | {
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190 | if (group->field_data1 == NULL) {
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191 | ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
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192 | return 0;
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193 | }
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194 |
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195 | return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
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196 | }
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197 |
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198 | int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
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199 | BN_CTX *ctx)
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200 | {
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201 | if (group->field_data1 == NULL) {
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202 | ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
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203 | return 0;
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204 | }
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205 |
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206 | return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
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207 | }
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208 |
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209 | int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r,
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210 | const BIGNUM *a, BN_CTX *ctx)
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211 | {
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212 | if (group->field_data1 == NULL) {
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213 | ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
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214 | return 0;
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215 | }
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216 |
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217 | return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
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218 | }
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219 |
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220 | int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r,
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221 | const BIGNUM *a, BN_CTX *ctx)
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222 | {
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223 | if (group->field_data1 == NULL) {
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224 | ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
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225 | return 0;
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226 | }
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227 |
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228 | return BN_from_montgomery(r, a, group->field_data1, ctx);
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229 | }
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230 |
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231 | int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r,
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232 | BN_CTX *ctx)
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233 | {
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234 | if (group->field_data2 == NULL) {
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235 | ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
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236 | return 0;
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237 | }
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238 |
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239 | if (!BN_copy(r, group->field_data2))
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240 | return 0;
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241 | return 1;
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242 | }
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