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380
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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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 #include "tomcrypt.h" |
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12 #include <stdarg.h> |
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13 |
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14 |
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15 /** |
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16 @file der_decode_sequence_ex.c |
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17 ASN.1 DER, decode a SEQUENCE, Tom St Denis |
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18 */ |
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19 |
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20 #ifdef LTC_DER |
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21 |
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22 /** |
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23 Decode a SEQUENCE |
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24 @param in The DER encoded input |
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25 @param inlen The size of the input |
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26 @param list The list of items to decode |
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27 @param outlen The number of items in the list |
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28 @param ordered Search an unordeded or ordered list |
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29 @return CRYPT_OK on success |
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30 */ |
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31 int der_decode_sequence_ex(const unsigned char *in, unsigned long inlen, |
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32 ltc_asn1_list *list, unsigned long outlen, int ordered) |
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33 { |
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34 int err, type; |
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35 unsigned long size, x, y, z, i, blksize; |
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36 void *data; |
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37 |
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38 LTC_ARGCHK(in != NULL); |
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39 LTC_ARGCHK(list != NULL); |
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40 |
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41 /* get blk size */ |
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42 if (inlen < 2) { |
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43 return CRYPT_INVALID_PACKET; |
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44 } |
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45 |
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46 /* sequence type? We allow 0x30 SEQUENCE and 0x31 SET since fundamentally they're the same structure */ |
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47 x = 0; |
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48 if (in[x] != 0x30 && in[x] != 0x31) { |
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49 return CRYPT_INVALID_PACKET; |
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50 } |
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51 ++x; |
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52 |
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53 if (in[x] < 128) { |
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54 blksize = in[x++]; |
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55 } else if (in[x] & 0x80) { |
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56 if (in[x] < 0x81 || in[x] > 0x83) { |
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57 return CRYPT_INVALID_PACKET; |
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58 } |
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59 y = in[x++] & 0x7F; |
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60 |
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61 /* would reading the len bytes overrun? */ |
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62 if (x + y > inlen) { |
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63 return CRYPT_INVALID_PACKET; |
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64 } |
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65 |
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66 /* read len */ |
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67 blksize = 0; |
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68 while (y--) { |
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69 blksize = (blksize << 8) | (unsigned long)in[x++]; |
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70 } |
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71 } |
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72 |
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73 /* would this blksize overflow? */ |
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74 if (x + blksize > inlen) { |
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75 return CRYPT_INVALID_PACKET; |
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76 } |
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77 |
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78 /* mark all as unused */ |
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79 for (i = 0; i < outlen; i++) { |
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80 list[i].used = 0; |
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81 } |
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82 |
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83 /* ok read data */ |
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84 inlen = blksize; |
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85 for (i = 0; i < outlen; i++) { |
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86 z = 0; |
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87 type = list[i].type; |
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88 size = list[i].size; |
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89 data = list[i].data; |
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90 if (!ordered && list[i].used == 1) { continue; } |
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91 |
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92 if (type == LTC_ASN1_EOL) { |
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93 break; |
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94 } |
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95 |
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96 switch (type) { |
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97 case LTC_ASN1_BOOLEAN: |
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98 z = inlen; |
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99 if ((err = der_decode_boolean(in + x, z, ((int *)data))) != CRYPT_OK) { |
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100 goto LBL_ERR; |
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101 } |
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102 if ((err = der_length_boolean(&z)) != CRYPT_OK) { |
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103 goto LBL_ERR; |
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104 } |
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105 break; |
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106 |
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107 case LTC_ASN1_INTEGER: |
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108 z = inlen; |
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109 if ((err = der_decode_integer(in + x, z, data)) != CRYPT_OK) { |
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110 if (!ordered) { continue; } |
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111 goto LBL_ERR; |
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112 } |
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113 if ((err = der_length_integer(data, &z)) != CRYPT_OK) { |
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114 goto LBL_ERR; |
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115 } |
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116 break; |
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117 |
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118 case LTC_ASN1_SHORT_INTEGER: |
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119 z = inlen; |
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120 if ((err = der_decode_short_integer(in + x, z, data)) != CRYPT_OK) { |
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121 if (!ordered) { continue; } |
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122 goto LBL_ERR; |
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123 } |
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124 if ((err = der_length_short_integer(((unsigned long*)data)[0], &z)) != CRYPT_OK) { |
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125 goto LBL_ERR; |
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126 } |
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127 |
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128 break; |
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129 |
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130 case LTC_ASN1_BIT_STRING: |
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131 z = inlen; |
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132 if ((err = der_decode_bit_string(in + x, z, data, &size)) != CRYPT_OK) { |
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133 if (!ordered) { continue; } |
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134 goto LBL_ERR; |
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135 } |
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136 list[i].size = size; |
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137 if ((err = der_length_bit_string(size, &z)) != CRYPT_OK) { |
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138 goto LBL_ERR; |
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139 } |
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140 break; |
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141 |
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142 case LTC_ASN1_OCTET_STRING: |
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143 z = inlen; |
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144 if ((err = der_decode_octet_string(in + x, z, data, &size)) != CRYPT_OK) { |
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145 if (!ordered) { continue; } |
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146 goto LBL_ERR; |
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147 } |
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148 list[i].size = size; |
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149 if ((err = der_length_octet_string(size, &z)) != CRYPT_OK) { |
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150 goto LBL_ERR; |
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151 } |
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152 break; |
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153 |
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154 case LTC_ASN1_NULL: |
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155 if (inlen < 2 || in[x] != 0x05 || in[x+1] != 0x00) { |
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156 if (!ordered) { continue; } |
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157 err = CRYPT_INVALID_PACKET; |
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158 goto LBL_ERR; |
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159 } |
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160 z = 2; |
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161 break; |
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162 |
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163 case LTC_ASN1_OBJECT_IDENTIFIER: |
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164 z = inlen; |
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165 if ((err = der_decode_object_identifier(in + x, z, data, &size)) != CRYPT_OK) { |
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166 if (!ordered) { continue; } |
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167 goto LBL_ERR; |
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168 } |
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169 list[i].size = size; |
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170 if ((err = der_length_object_identifier(data, size, &z)) != CRYPT_OK) { |
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171 goto LBL_ERR; |
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172 } |
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173 break; |
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174 |
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175 case LTC_ASN1_IA5_STRING: |
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176 z = inlen; |
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177 if ((err = der_decode_ia5_string(in + x, z, data, &size)) != CRYPT_OK) { |
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178 if (!ordered) { continue; } |
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179 goto LBL_ERR; |
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180 } |
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181 list[i].size = size; |
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182 if ((err = der_length_ia5_string(data, size, &z)) != CRYPT_OK) { |
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183 goto LBL_ERR; |
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184 } |
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185 break; |
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186 |
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187 |
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188 case LTC_ASN1_PRINTABLE_STRING: |
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189 z = inlen; |
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190 if ((err = der_decode_printable_string(in + x, z, data, &size)) != CRYPT_OK) { |
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191 if (!ordered) { continue; } |
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192 goto LBL_ERR; |
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193 } |
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194 list[i].size = size; |
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195 if ((err = der_length_printable_string(data, size, &z)) != CRYPT_OK) { |
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196 goto LBL_ERR; |
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197 } |
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198 break; |
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199 |
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200 case LTC_ASN1_UTF8_STRING: |
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201 z = inlen; |
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202 if ((err = der_decode_utf8_string(in + x, z, data, &size)) != CRYPT_OK) { |
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203 if (!ordered) { continue; } |
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204 goto LBL_ERR; |
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205 } |
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206 list[i].size = size; |
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207 if ((err = der_length_utf8_string(data, size, &z)) != CRYPT_OK) { |
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208 goto LBL_ERR; |
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209 } |
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210 break; |
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211 |
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212 case LTC_ASN1_UTCTIME: |
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213 z = inlen; |
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214 if ((err = der_decode_utctime(in + x, &z, data)) != CRYPT_OK) { |
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215 if (!ordered) { continue; } |
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216 goto LBL_ERR; |
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217 } |
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218 break; |
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219 |
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220 case LTC_ASN1_SET: |
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221 z = inlen; |
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222 if ((err = der_decode_set(in + x, z, data, size)) != CRYPT_OK) { |
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223 if (!ordered) { continue; } |
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224 goto LBL_ERR; |
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225 } |
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226 if ((err = der_length_sequence(data, size, &z)) != CRYPT_OK) { |
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227 goto LBL_ERR; |
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228 } |
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229 break; |
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230 |
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231 case LTC_ASN1_SETOF: |
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232 case LTC_ASN1_SEQUENCE: |
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233 /* detect if we have the right type */ |
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234 if ((type == LTC_ASN1_SETOF && (in[x] & 0x3F) != 0x31) || (type == LTC_ASN1_SEQUENCE && (in[x] & 0x3F) != 0x30)) { |
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235 err = CRYPT_INVALID_PACKET; |
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236 goto LBL_ERR; |
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237 } |
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238 |
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239 z = inlen; |
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240 if ((err = der_decode_sequence(in + x, z, data, size)) != CRYPT_OK) { |
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241 if (!ordered) { continue; } |
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242 goto LBL_ERR; |
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243 } |
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244 if ((err = der_length_sequence(data, size, &z)) != CRYPT_OK) { |
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245 goto LBL_ERR; |
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246 } |
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247 break; |
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248 |
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249 |
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250 case LTC_ASN1_CHOICE: |
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251 z = inlen; |
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252 if ((err = der_decode_choice(in + x, &z, data, size)) != CRYPT_OK) { |
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253 if (!ordered) { continue; } |
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254 goto LBL_ERR; |
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255 } |
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256 break; |
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257 |
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258 default: |
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259 err = CRYPT_INVALID_ARG; |
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260 goto LBL_ERR; |
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261 } |
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262 x += z; |
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263 inlen -= z; |
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264 list[i].used = 1; |
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265 if (!ordered) { |
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266 /* restart the decoder */ |
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267 i = -1; |
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268 } |
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269 } |
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270 |
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271 for (i = 0; i < outlen; i++) { |
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272 if (list[i].used == 0) { |
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273 err = CRYPT_INVALID_PACKET; |
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274 goto LBL_ERR; |
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275 } |
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276 } |
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277 err = CRYPT_OK; |
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278 |
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279 LBL_ERR: |
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280 return err; |
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281 } |
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282 |
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283 #endif |
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284 |
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285 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_ex.c,v $ */ |
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286 /* $Revision: 1.15 $ */ |
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287 /* $Date: 2006/11/26 02:25:18 $ */ |
