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1 /* x_bignum.c */ |
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2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL |
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3 * project 2000. |
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4 */ |
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5 /* ==================================================================== |
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6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved. |
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7 * |
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8 * Redistribution and use in source and binary forms, with or without |
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9 * modification, are permitted provided that the following conditions |
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10 * are met: |
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11 * |
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12 * 1. Redistributions of source code must retain the above copyright |
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13 * notice, this list of conditions and the following disclaimer. |
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14 * |
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15 * 2. Redistributions in binary form must reproduce the above copyright |
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16 * notice, this list of conditions and the following disclaimer in |
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17 * the documentation and/or other materials provided with the |
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18 * distribution. |
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19 * |
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20 * 3. All advertising materials mentioning features or use of this |
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21 * software must display the following acknowledgment: |
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22 * "This product includes software developed by the OpenSSL Project |
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23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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24 * |
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25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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26 * endorse or promote products derived from this software without |
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27 * prior written permission. For written permission, please contact |
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28 * licensing@OpenSSL.org. |
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29 * |
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30 * 5. Products derived from this software may not be called "OpenSSL" |
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31 * nor may "OpenSSL" appear in their names without prior written |
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32 * permission of the OpenSSL Project. |
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33 * |
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34 * 6. Redistributions of any form whatsoever must retain the following |
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35 * acknowledgment: |
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36 * "This product includes software developed by the OpenSSL Project |
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37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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38 * |
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39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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50 * OF THE POSSIBILITY OF SUCH DAMAGE. |
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51 * ==================================================================== |
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52 * |
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53 * This product includes cryptographic software written by Eric Young |
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54 * (eay@cryptsoft.com). This product includes software written by Tim |
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55 * Hudson (tjh@cryptsoft.com). |
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56 * |
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57 */ |
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58 /* |
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59 © Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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60 */ |
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61 |
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62 |
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63 #include <stdio.h> |
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64 #include "cryptlib.h" |
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65 #include <openssl/asn1t.h> |
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66 #include <openssl/bn.h> |
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67 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__))) |
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68 #include "libcrypto_wsd_macros.h" |
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69 #include "libcrypto_wsd.h" |
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70 #endif |
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71 |
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72 /* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a |
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73 * BIGNUM directly. Currently it ignores the sign which isn't a problem since all |
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74 * BIGNUMs used are non negative and anything that looks negative is normally due |
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75 * to an encoding error. |
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76 */ |
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77 |
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78 #define BN_SENSITIVE 1 |
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79 |
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80 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it); |
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81 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it); |
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82 |
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83 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); |
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84 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); |
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85 |
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86 #ifndef EMULATOR |
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87 static ASN1_PRIMITIVE_FUNCS bignum_pf = { |
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88 NULL, 0, |
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89 bn_new, |
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90 bn_free, |
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91 0, |
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92 bn_c2i, |
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93 bn_i2c |
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94 }; |
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95 #else |
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96 static const ASN1_PRIMITIVE_FUNCS bignum_pf = { |
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97 NULL, 0, |
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98 bn_new, |
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99 bn_free, |
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100 0, |
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101 bn_c2i, |
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102 bn_i2c |
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103 }; |
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104 #endif |
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105 |
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106 |
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107 ASN1_ITEM_start(BIGNUM) |
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108 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM" |
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109 ASN1_ITEM_end(BIGNUM) |
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110 |
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111 ASN1_ITEM_start(CBIGNUM) |
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112 ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM" |
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113 ASN1_ITEM_end(CBIGNUM) |
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114 |
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115 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it) |
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116 { |
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117 *pval = (ASN1_VALUE *)BN_new(); |
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118 if(*pval) return 1; |
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119 else return 0; |
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120 } |
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121 |
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122 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it) |
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123 { |
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124 if(!*pval) return; |
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125 if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval); |
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126 else BN_free((BIGNUM *)*pval); |
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127 *pval = NULL; |
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128 } |
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129 |
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130 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it) |
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131 { |
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132 BIGNUM *bn; |
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133 int pad; |
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134 if(!*pval) return -1; |
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135 bn = (BIGNUM *)*pval; |
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136 /* If MSB set in an octet we need a padding byte */ |
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137 if(BN_num_bits(bn) & 0x7) pad = 0; |
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138 else pad = 1; |
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139 if(cont) { |
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140 if(pad) *cont++ = 0; |
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141 BN_bn2bin(bn, cont); |
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142 } |
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143 return pad + BN_num_bytes(bn); |
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144 } |
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145 |
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146 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, |
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147 int utype, char *free_cont, const ASN1_ITEM *it) |
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148 { |
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149 BIGNUM *bn; |
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150 if(!*pval) bn_new(pval, it); |
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151 bn = (BIGNUM *)*pval; |
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152 if(!BN_bin2bn(cont, len, bn)) { |
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153 bn_free(pval, it); |
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154 return 0; |
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155 } |
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156 return 1; |
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157 } |
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158 |
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159 |