1 | /* crypto/bn/bn_ctx.c */
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2 | /* Written by Ulf Moeller for the OpenSSL project. */
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3 | /* ====================================================================
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4 | * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
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5 | *
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6 | * Redistribution and use in source and binary forms, with or without
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7 | * modification, are permitted provided that the following conditions
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8 | * are met:
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9 | *
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10 | * 1. Redistributions of source code must retain the above copyright
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11 | * notice, this list of conditions and the following disclaimer.
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12 | *
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13 | * 2. Redistributions in binary form must reproduce the above copyright
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14 | * notice, this list of conditions and the following disclaimer in
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15 | * the documentation and/or other materials provided with the
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16 | * distribution.
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17 | *
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18 | * 3. All advertising materials mentioning features or use of this
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19 | * software must display the following acknowledgment:
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20 | * "This product includes software developed by the OpenSSL Project
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21 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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22 | *
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23 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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24 | * endorse or promote products derived from this software without
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25 | * prior written permission. For written permission, please contact
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26 | * openssl-core@openssl.org.
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27 | *
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28 | * 5. Products derived from this software may not be called "OpenSSL"
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29 | * nor may "OpenSSL" appear in their names without prior written
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30 | * permission of the OpenSSL Project.
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31 | *
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32 | * 6. Redistributions of any form whatsoever must retain the following
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33 | * acknowledgment:
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34 | * "This product includes software developed by the OpenSSL Project
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35 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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36 | *
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37 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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38 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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39 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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40 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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41 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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42 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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43 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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44 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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45 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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46 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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47 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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48 | * OF THE POSSIBILITY OF SUCH DAMAGE.
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49 | * ====================================================================
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50 | *
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51 | * This product includes cryptographic software written by Eric Young
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52 | * (eay@cryptsoft.com). This product includes software written by Tim
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53 | * Hudson (tjh@cryptsoft.com).
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54 | *
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55 | */
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56 |
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57 | #ifndef BN_CTX_DEBUG
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58 | # undef NDEBUG /* avoid conflicting definitions */
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59 | # define NDEBUG
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60 | #endif
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61 |
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62 | #include <stdio.h>
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63 | #include <assert.h>
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64 | #include "bn.h"
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65 | #include "openssl_mods.h"
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66 |
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67 | BN_CTX *BN_CTX_new(void)
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68 | {
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69 | BN_CTX *ret;
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70 |
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71 | ret=(BN_CTX *)OPENSSL_malloc(sizeof(BN_CTX));
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72 | if (ret == NULL)
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73 | {
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74 | return(NULL);
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75 | }
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76 |
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77 | BN_CTX_init(ret);
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78 | ret->flags=BN_FLG_MALLOCED;
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79 | return(ret);
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80 | }
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81 |
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82 | void BN_CTX_init(BN_CTX *ctx)
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83 | {
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84 | int i;
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85 | ctx->tos = 0;
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86 | ctx->flags = 0;
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87 | ctx->depth = 0;
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88 | ctx->too_many = 0;
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89 | for (i = 0; i < BN_CTX_NUM; i++)
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90 | BN_init(&(ctx->bn[i]));
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91 | }
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92 |
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93 | void BN_CTX_free(BN_CTX *ctx)
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94 | {
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95 | int i;
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96 |
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97 | if (ctx == NULL) return;
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98 | assert(ctx->depth == 0);
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99 |
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100 | for (i=0; i < BN_CTX_NUM; i++)
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101 | BN_clear_free(&(ctx->bn[i]));
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102 | if (ctx->flags & BN_FLG_MALLOCED)
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103 | OPENSSL_free(ctx);
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104 | }
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105 |
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106 | void BN_CTX_start(BN_CTX *ctx)
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107 | {
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108 | if (ctx->depth < BN_CTX_NUM_POS)
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109 | ctx->pos[ctx->depth] = ctx->tos;
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110 | ctx->depth++;
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111 | }
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112 |
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113 | BIGNUM *BN_CTX_get(BN_CTX *ctx)
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114 | {
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115 | if (ctx->depth > BN_CTX_NUM_POS || ctx->tos >= BN_CTX_NUM)
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116 | {
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117 | if (!ctx->too_many)
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118 | {
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119 | /* disable error code until BN_CTX_end is called: */
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120 | ctx->too_many = 1;
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121 | }
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122 | return NULL;
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123 | }
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124 | return (&(ctx->bn[ctx->tos++]));
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125 | }
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126 |
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127 | void BN_CTX_end(BN_CTX *ctx)
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128 | {
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129 | if (ctx == NULL) return;
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130 | assert(ctx->depth > 0);
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131 | if (ctx->depth == 0)
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132 | /* should never happen, but we can tolerate it if not in
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133 | * debug mode (could be a 'goto err' in the calling function
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134 | * before BN_CTX_start was reached) */
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135 | BN_CTX_start(ctx);
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136 |
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137 | ctx->too_many = 0;
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138 | ctx->depth--;
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139 | if (ctx->depth < BN_CTX_NUM_POS)
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140 | ctx->tos = ctx->pos[ctx->depth];
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141 | }
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