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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_encode_sequence_ex.c |
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17 ASN.1 DER, encode 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 Encode a SEQUENCE |
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24 @param list The list of items to encode |
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25 @param inlen The number of items in the list |
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26 @param out [out] The destination |
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27 @param outlen [in/out] The size of the output |
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28 @param type_of LTC_ASN1_SEQUENCE or LTC_ASN1_SET/LTC_ASN1_SETOF |
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29 @return CRYPT_OK on success |
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30 */ |
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31 int der_encode_sequence_ex(ltc_asn1_list *list, unsigned long inlen, |
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32 unsigned char *out, unsigned long *outlen, int type_of) |
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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; |
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36 void *data; |
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37 |
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38 LTC_ARGCHK(list != NULL); |
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39 LTC_ARGCHK(out != NULL); |
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40 LTC_ARGCHK(outlen != NULL); |
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41 |
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42 /* get size of output that will be required */ |
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43 y = 0; |
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44 for (i = 0; i < inlen; i++) { |
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45 type = list[i].type; |
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46 size = list[i].size; |
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47 data = list[i].data; |
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48 |
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49 if (type == LTC_ASN1_EOL) { |
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50 break; |
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51 } |
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52 |
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53 switch (type) { |
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54 case LTC_ASN1_BOOLEAN: |
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55 if ((err = der_length_boolean(&x)) != CRYPT_OK) { |
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56 goto LBL_ERR; |
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57 } |
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58 y += x; |
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59 break; |
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60 |
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61 case LTC_ASN1_INTEGER: |
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62 if ((err = der_length_integer(data, &x)) != CRYPT_OK) { |
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63 goto LBL_ERR; |
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64 } |
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65 y += x; |
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66 break; |
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67 |
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68 case LTC_ASN1_SHORT_INTEGER: |
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69 if ((err = der_length_short_integer(*((unsigned long*)data), &x)) != CRYPT_OK) { |
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70 goto LBL_ERR; |
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71 } |
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72 y += x; |
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73 break; |
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74 |
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75 case LTC_ASN1_BIT_STRING: |
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76 if ((err = der_length_bit_string(size, &x)) != CRYPT_OK) { |
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77 goto LBL_ERR; |
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78 } |
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79 y += x; |
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80 break; |
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81 |
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82 case LTC_ASN1_OCTET_STRING: |
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83 if ((err = der_length_octet_string(size, &x)) != CRYPT_OK) { |
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84 goto LBL_ERR; |
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85 } |
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86 y += x; |
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87 break; |
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88 |
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89 case LTC_ASN1_NULL: |
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90 y += 2; |
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91 break; |
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92 |
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93 case LTC_ASN1_OBJECT_IDENTIFIER: |
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94 if ((err = der_length_object_identifier(data, size, &x)) != CRYPT_OK) { |
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95 goto LBL_ERR; |
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96 } |
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97 y += x; |
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98 break; |
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99 |
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100 case LTC_ASN1_IA5_STRING: |
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101 if ((err = der_length_ia5_string(data, size, &x)) != CRYPT_OK) { |
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102 goto LBL_ERR; |
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103 } |
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104 y += x; |
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105 break; |
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106 |
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107 case LTC_ASN1_PRINTABLE_STRING: |
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108 if ((err = der_length_printable_string(data, size, &x)) != CRYPT_OK) { |
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109 goto LBL_ERR; |
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110 } |
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111 y += x; |
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112 break; |
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113 |
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114 case LTC_ASN1_UTF8_STRING: |
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115 if ((err = der_length_utf8_string(data, size, &x)) != CRYPT_OK) { |
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116 goto LBL_ERR; |
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117 } |
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118 y += x; |
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119 break; |
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120 |
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121 case LTC_ASN1_UTCTIME: |
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122 if ((err = der_length_utctime(data, &x)) != CRYPT_OK) { |
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123 goto LBL_ERR; |
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124 } |
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125 y += x; |
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126 break; |
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127 |
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128 case LTC_ASN1_SET: |
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129 case LTC_ASN1_SETOF: |
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130 case LTC_ASN1_SEQUENCE: |
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131 if ((err = der_length_sequence(data, size, &x)) != CRYPT_OK) { |
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132 goto LBL_ERR; |
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133 } |
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134 y += x; |
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135 break; |
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136 |
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137 default: |
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138 err = CRYPT_INVALID_ARG; |
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139 goto LBL_ERR; |
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140 } |
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141 } |
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142 |
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143 /* calc header size */ |
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144 z = y; |
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145 if (y < 128) { |
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146 y += 2; |
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147 } else if (y < 256) { |
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148 /* 0x30 0x81 LL */ |
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149 y += 3; |
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150 } else if (y < 65536UL) { |
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151 /* 0x30 0x82 LL LL */ |
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152 y += 4; |
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153 } else if (y < 16777216UL) { |
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154 /* 0x30 0x83 LL LL LL */ |
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155 y += 5; |
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156 } else { |
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157 err = CRYPT_INVALID_ARG; |
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158 goto LBL_ERR; |
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159 } |
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160 |
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161 /* too big ? */ |
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162 if (*outlen < y) { |
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163 *outlen = y; |
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164 err = CRYPT_BUFFER_OVERFLOW; |
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165 goto LBL_ERR; |
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166 } |
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167 |
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168 /* store header */ |
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169 x = 0; |
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170 out[x++] = (type_of == LTC_ASN1_SEQUENCE) ? 0x30 : 0x31; |
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171 |
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172 if (z < 128) { |
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173 out[x++] = (unsigned char)z; |
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174 } else if (z < 256) { |
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175 out[x++] = 0x81; |
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176 out[x++] = (unsigned char)z; |
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177 } else if (z < 65536UL) { |
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178 out[x++] = 0x82; |
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179 out[x++] = (unsigned char)((z>>8UL)&255); |
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180 out[x++] = (unsigned char)(z&255); |
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181 } else if (z < 16777216UL) { |
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182 out[x++] = 0x83; |
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183 out[x++] = (unsigned char)((z>>16UL)&255); |
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184 out[x++] = (unsigned char)((z>>8UL)&255); |
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185 out[x++] = (unsigned char)(z&255); |
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186 } |
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187 |
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188 /* store data */ |
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189 *outlen -= x; |
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190 for (i = 0; i < inlen; i++) { |
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191 type = list[i].type; |
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192 size = list[i].size; |
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193 data = list[i].data; |
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194 |
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195 if (type == LTC_ASN1_EOL) { |
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196 break; |
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197 } |
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198 |
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199 switch (type) { |
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200 case LTC_ASN1_BOOLEAN: |
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201 z = *outlen; |
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202 if ((err = der_encode_boolean(*((int *)data), out + x, &z)) != CRYPT_OK) { |
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203 goto LBL_ERR; |
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204 } |
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205 x += z; |
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206 *outlen -= z; |
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207 break; |
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208 |
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209 case LTC_ASN1_INTEGER: |
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210 z = *outlen; |
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211 if ((err = der_encode_integer(data, out + x, &z)) != CRYPT_OK) { |
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212 goto LBL_ERR; |
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213 } |
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214 x += z; |
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215 *outlen -= z; |
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216 break; |
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217 |
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218 case LTC_ASN1_SHORT_INTEGER: |
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219 z = *outlen; |
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220 if ((err = der_encode_short_integer(*((unsigned long*)data), out + x, &z)) != CRYPT_OK) { |
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221 goto LBL_ERR; |
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222 } |
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223 x += z; |
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224 *outlen -= z; |
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225 break; |
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226 |
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227 case LTC_ASN1_BIT_STRING: |
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228 z = *outlen; |
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229 if ((err = der_encode_bit_string(data, size, out + x, &z)) != CRYPT_OK) { |
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230 goto LBL_ERR; |
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231 } |
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232 x += z; |
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233 *outlen -= z; |
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234 break; |
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235 |
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236 case LTC_ASN1_OCTET_STRING: |
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237 z = *outlen; |
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238 if ((err = der_encode_octet_string(data, size, out + x, &z)) != CRYPT_OK) { |
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239 goto LBL_ERR; |
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240 } |
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241 x += z; |
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242 *outlen -= z; |
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243 break; |
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244 |
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245 case LTC_ASN1_NULL: |
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246 out[x++] = 0x05; |
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247 out[x++] = 0x00; |
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248 *outlen -= 2; |
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249 break; |
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250 |
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251 case LTC_ASN1_OBJECT_IDENTIFIER: |
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252 z = *outlen; |
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253 if ((err = der_encode_object_identifier(data, size, out + x, &z)) != CRYPT_OK) { |
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254 goto LBL_ERR; |
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255 } |
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256 x += z; |
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257 *outlen -= z; |
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258 break; |
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259 |
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260 case LTC_ASN1_IA5_STRING: |
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261 z = *outlen; |
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262 if ((err = der_encode_ia5_string(data, size, out + x, &z)) != CRYPT_OK) { |
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263 goto LBL_ERR; |
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264 } |
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265 x += z; |
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266 *outlen -= z; |
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267 break; |
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268 |
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269 case LTC_ASN1_PRINTABLE_STRING: |
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270 z = *outlen; |
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271 if ((err = der_encode_printable_string(data, size, out + x, &z)) != CRYPT_OK) { |
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272 goto LBL_ERR; |
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273 } |
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274 x += z; |
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275 *outlen -= z; |
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276 break; |
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277 |
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278 case LTC_ASN1_UTF8_STRING: |
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279 z = *outlen; |
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280 if ((err = der_encode_utf8_string(data, size, out + x, &z)) != CRYPT_OK) { |
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281 goto LBL_ERR; |
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282 } |
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283 x += z; |
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284 *outlen -= z; |
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285 break; |
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286 |
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287 case LTC_ASN1_UTCTIME: |
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288 z = *outlen; |
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289 if ((err = der_encode_utctime(data, out + x, &z)) != CRYPT_OK) { |
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290 goto LBL_ERR; |
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291 } |
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292 x += z; |
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293 *outlen -= z; |
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294 break; |
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295 |
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296 case LTC_ASN1_SET: |
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297 z = *outlen; |
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298 if ((err = der_encode_set(data, size, out + x, &z)) != CRYPT_OK) { |
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299 goto LBL_ERR; |
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300 } |
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301 x += z; |
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302 *outlen -= z; |
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303 break; |
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304 |
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305 case LTC_ASN1_SETOF: |
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306 z = *outlen; |
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307 if ((err = der_encode_setof(data, size, out + x, &z)) != CRYPT_OK) { |
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308 goto LBL_ERR; |
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309 } |
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310 x += z; |
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311 *outlen -= z; |
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312 break; |
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313 |
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314 case LTC_ASN1_SEQUENCE: |
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315 z = *outlen; |
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316 if ((err = der_encode_sequence_ex(data, size, out + x, &z, type)) != CRYPT_OK) { |
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317 goto LBL_ERR; |
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318 } |
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319 x += z; |
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320 *outlen -= z; |
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321 break; |
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322 |
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323 default: |
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324 err = CRYPT_INVALID_ARG; |
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325 goto LBL_ERR; |
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326 } |
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327 } |
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328 *outlen = x; |
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329 err = CRYPT_OK; |
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330 |
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331 LBL_ERR: |
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332 return err; |
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333 } |
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334 |
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335 #endif |
