OpenWrt – Blame information for rev 1
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Rev | Author | Line No. | Line |
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1 | office | 1 | /* crypto/bn/bn_ctx.c */ |
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 | |||
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 | |||
62 | #include <stdio.h> |
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63 | #include <stdlib.h> |
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64 | #include <assert.h> |
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65 | #include <bn.h> |
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66 | |||
67 | |||
68 | BN_CTX *BN_CTX_new(void) |
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69 | { |
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70 | BN_CTX *ret; |
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71 | |||
72 | ret=(BN_CTX *)malloc(sizeof(BN_CTX)); |
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73 | if (ret == NULL) |
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74 | { |
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75 | return(NULL); |
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76 | } |
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77 | |||
78 | BN_CTX_init(ret); |
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79 | ret->flags=BN_FLG_MALLOCED; |
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80 | return(ret); |
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81 | } |
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82 | |||
83 | void BN_CTX_init(BN_CTX *ctx) |
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84 | { |
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85 | int i; |
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86 | ctx->tos = 0; |
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87 | ctx->flags = 0; |
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88 | ctx->depth = 0; |
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89 | ctx->too_many = 0; |
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90 | for (i = 0; i < BN_CTX_NUM; i++) |
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91 | BN_init(&(ctx->bn[i])); |
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92 | } |
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93 | |||
94 | void BN_CTX_free(BN_CTX *ctx) |
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95 | { |
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96 | int i; |
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97 | |||
98 | if (ctx == NULL) return; |
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99 | assert(ctx->depth == 0); |
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100 | |||
101 | for (i=0; i < BN_CTX_NUM; i++) |
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102 | BN_clear_free(&(ctx->bn[i])); |
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103 | if (ctx->flags & BN_FLG_MALLOCED) |
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104 | free(ctx); |
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105 | } |
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106 | |||
107 | void BN_CTX_start(BN_CTX *ctx) |
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108 | { |
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109 | if (ctx->depth < BN_CTX_NUM_POS) |
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110 | ctx->pos[ctx->depth] = ctx->tos; |
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111 | ctx->depth++; |
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112 | } |
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113 | |||
114 | BIGNUM *BN_CTX_get(BN_CTX *ctx) |
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115 | { |
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116 | if (ctx->depth > BN_CTX_NUM_POS || ctx->tos >= BN_CTX_NUM) |
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117 | { |
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118 | if (!ctx->too_many) |
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119 | { |
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120 | /* disable error code until BN_CTX_end is called: */ |
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121 | ctx->too_many = 1; |
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122 | } |
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123 | return NULL; |
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124 | } |
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125 | return (&(ctx->bn[ctx->tos++])); |
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126 | } |
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127 | |||
128 | void BN_CTX_end(BN_CTX *ctx) |
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129 | { |
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130 | if (ctx == NULL) return; |
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131 | assert(ctx->depth > 0); |
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132 | if (ctx->depth == 0) |
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133 | /* should never happen, but we can tolerate it if not in |
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134 | * debug mode (could be a 'goto err' in the calling function |
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135 | * before BN_CTX_start was reached) */ |
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136 | BN_CTX_start(ctx); |
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137 | |||
138 | ctx->too_many = 0; |
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139 | ctx->depth--; |
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140 | if (ctx->depth < BN_CTX_NUM_POS) |
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141 | ctx->tos = ctx->pos[ctx->depth]; |
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142 | } |