Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/set/der_encode_setof.c @ 1854:cba37fe1ddc8
Fix accidentally committed debug message
Was added Oct 18 2021
"Only redirect stderr after the session login."
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 22 Jan 2022 12:46:08 +0800 |
parents | 6dba84798cd5 |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file der_encode_setof.c |
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13 ASN.1 DER, Encode SET OF, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_DER |
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17 |
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18 struct edge { |
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19 unsigned char *start; |
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20 unsigned long size; |
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21 }; |
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22 |
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23 static int _qsort_helper(const void *a, const void *b) |
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24 { |
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25 struct edge *A = (struct edge *)a, *B = (struct edge *)b; |
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26 int r; |
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27 unsigned long x; |
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28 |
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29 /* compare min length */ |
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30 r = XMEMCMP(A->start, B->start, MIN(A->size, B->size)); |
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31 |
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32 if (r == 0 && A->size != B->size) { |
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33 if (A->size > B->size) { |
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34 for (x = B->size; x < A->size; x++) { |
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35 if (A->start[x]) { |
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36 return 1; |
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37 } |
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38 } |
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39 } else { |
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40 for (x = A->size; x < B->size; x++) { |
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41 if (B->start[x]) { |
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42 return -1; |
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43 } |
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44 } |
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45 } |
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46 } |
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47 |
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48 return r; |
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49 } |
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50 |
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51 /** |
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52 Encode a SETOF stucture |
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53 @param list The list of items to encode |
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54 @param inlen The number of items in the list |
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55 @param out [out] The destination |
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56 @param outlen [in/out] The size of the output |
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57 @return CRYPT_OK on success |
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58 */ |
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59 int der_encode_setof(ltc_asn1_list *list, unsigned long inlen, |
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60 unsigned char *out, unsigned long *outlen) |
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61 { |
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62 unsigned long x, y, z; |
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63 ptrdiff_t hdrlen; |
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64 int err; |
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65 struct edge *edges; |
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66 unsigned char *ptr, *buf; |
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67 |
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68 /* check that they're all the same type */ |
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69 for (x = 1; x < inlen; x++) { |
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70 if (list[x].type != list[x-1].type) { |
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71 return CRYPT_INVALID_ARG; |
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72 } |
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73 } |
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74 |
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75 /* alloc buffer to store copy of output */ |
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76 buf = XCALLOC(1, *outlen); |
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77 if (buf == NULL) { |
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78 return CRYPT_MEM; |
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79 } |
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80 |
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81 /* encode list */ |
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82 if ((err = der_encode_sequence_ex(list, inlen, buf, outlen, LTC_ASN1_SETOF)) != CRYPT_OK) { |
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83 XFREE(buf); |
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84 return err; |
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85 } |
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86 |
382
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87 /* allocate edges */ |
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88 edges = XCALLOC(inlen, sizeof(*edges)); |
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89 if (edges == NULL) { |
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90 XFREE(buf); |
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91 return CRYPT_MEM; |
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92 } |
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93 |
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94 /* skip header */ |
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95 ptr = buf + 1; |
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96 |
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97 /* now skip length data */ |
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98 x = *ptr++; |
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99 if (x >= 0x80) { |
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100 ptr += (x & 0x7F); |
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101 } |
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102 |
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103 /* get the size of the static header */ |
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104 hdrlen = ptr - buf; |
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105 |
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106 |
382
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107 /* scan for edges */ |
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108 x = 0; |
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109 while (ptr < (buf + *outlen)) { |
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110 /* store start */ |
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111 edges[x].start = ptr; |
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112 |
382
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113 /* skip type */ |
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114 z = 1; |
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115 |
382
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116 /* parse length */ |
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117 y = ptr[z++]; |
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118 if (y < 128) { |
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119 edges[x].size = y; |
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120 } else { |
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121 y &= 0x7F; |
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122 edges[x].size = 0; |
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123 while (y--) { |
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124 edges[x].size = (edges[x].size << 8) | ((unsigned long)ptr[z++]); |
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125 } |
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126 } |
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127 |
382
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128 /* skip content */ |
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129 edges[x].size += z; |
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130 ptr += edges[x].size; |
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131 ++x; |
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132 } |
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133 |
382
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134 /* sort based on contents (using edges) */ |
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135 XQSORT(edges, inlen, sizeof(*edges), &_qsort_helper); |
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136 |
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137 /* copy static header */ |
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138 XMEMCPY(out, buf, hdrlen); |
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139 |
382
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140 /* copy+sort using edges+indecies to output from buffer */ |
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141 for (y = (unsigned long)hdrlen, x = 0; x < inlen; x++) { |
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142 XMEMCPY(out+y, edges[x].start, edges[x].size); |
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143 y += edges[x].size; |
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144 } |
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145 |
382
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146 #ifdef LTC_CLEAN_STACK |
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147 zeromem(buf, *outlen); |
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148 #endif |
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149 |
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150 /* free buffers */ |
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151 XFREE(edges); |
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152 XFREE(buf); |
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153 |
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154 return CRYPT_OK; |
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155 } |
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156 |
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157 #endif |
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158 |
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159 /* ref: $Format:%D$ */ |
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160 /* git commit: $Format:%H$ */ |
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161 /* commit time: $Format:%ai$ */ |