Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/util/derdec.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4
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5 #include "secder.h"
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6 #include "secerr.h"
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7
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8 static PRUint32
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9 der_indefinite_length(unsigned char *buf, unsigned char *end)
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10 {
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11 PRUint32 len, ret, dataLen;
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12 unsigned char tag, lenCode;
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13 int dataLenLen;
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14
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15 len = 0;
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16 while ( 1 ) {
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17 if ((buf + 2) > end) {
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18 return(0);
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19 }
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20
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21 tag = *buf++;
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22 lenCode = *buf++;
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23 len += 2;
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24
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25 if ( ( tag == 0 ) && ( lenCode == 0 ) ) {
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26 return(len);
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27 }
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28
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29 if ( lenCode == 0x80 ) { /* indefinite length */
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30 ret = der_indefinite_length(buf, end); /* recurse to find length */
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31 if (ret == 0)
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32 return 0;
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33 len += ret;
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34 buf += ret;
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35 } else { /* definite length */
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36 if (lenCode & 0x80) {
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37 /* Length of data is in multibyte format */
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38 dataLenLen = lenCode & 0x7f;
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39 switch (dataLenLen) {
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40 case 1:
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41 dataLen = buf[0];
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42 break;
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43 case 2:
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44 dataLen = (buf[0]<<8)|buf[1];
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45 break;
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46 case 3:
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47 dataLen = ((unsigned long)buf[0]<<16)|(buf[1]<<8)|buf[2];
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48 break;
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49 case 4:
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50 dataLen = ((unsigned long)buf[0]<<24)|
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51 ((unsigned long)buf[1]<<16)|(buf[2]<<8)|buf[3];
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52 break;
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53 default:
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54 PORT_SetError(SEC_ERROR_BAD_DER);
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55 return SECFailure;
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56 }
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57 } else {
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58 /* Length of data is in single byte */
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59 dataLen = lenCode;
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60 dataLenLen = 0;
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61 }
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62
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63 /* skip this item */
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64 buf = buf + dataLenLen + dataLen;
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65 len = len + dataLenLen + dataLen;
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66 }
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67 }
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68 }
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69
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70 /*
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71 ** Capture the next thing in the buffer.
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72 ** Returns the length of the header and the length of the contents.
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73 */
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74 static SECStatus
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75 der_capture(unsigned char *buf, unsigned char *end,
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76 int *header_len_p, PRUint32 *contents_len_p)
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77 {
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78 unsigned char *bp;
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79 unsigned char whole_tag;
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80 PRUint32 contents_len;
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81 int tag_number;
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82
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83 if ((buf + 2) > end) {
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84 *header_len_p = 0;
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85 *contents_len_p = 0;
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86 if (buf == end)
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87 return SECSuccess;
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88 return SECFailure;
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89 }
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90
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91 bp = buf;
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92
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93 /* Get tag and verify that it is ok. */
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94 whole_tag = *bp++;
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95 tag_number = whole_tag & DER_TAGNUM_MASK;
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96
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97 /*
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98 * XXX This code does not (yet) handle the high-tag-number form!
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99 */
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100 if (tag_number == DER_HIGH_TAG_NUMBER) {
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101 PORT_SetError(SEC_ERROR_BAD_DER);
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102 return SECFailure;
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103 }
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104
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105 if ((whole_tag & DER_CLASS_MASK) == DER_UNIVERSAL) {
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106 /* Check that the universal tag number is one we implement. */
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107 switch (tag_number) {
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108 case DER_BOOLEAN:
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109 case DER_INTEGER:
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110 case DER_BIT_STRING:
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111 case DER_OCTET_STRING:
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112 case DER_NULL:
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113 case DER_OBJECT_ID:
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114 case DER_SEQUENCE:
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115 case DER_SET:
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116 case DER_PRINTABLE_STRING:
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117 case DER_T61_STRING:
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118 case DER_IA5_STRING:
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119 case DER_VISIBLE_STRING:
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120 case DER_UTC_TIME:
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121 case 0: /* end-of-contents tag */
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122 break;
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123 default:
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124 PORT_SetError(SEC_ERROR_BAD_DER);
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125 return SECFailure;
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126 }
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127 }
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128
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129 /*
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130 * Get first byte of length code (might contain entire length, might not).
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131 */
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132 contents_len = *bp++;
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133
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134 /*
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135 * If the high bit is set, then the length is in multibyte format,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
136 * or the thing has an indefinite-length.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
137 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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138 if (contents_len & 0x80) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
139 int bytes_of_encoded_len;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
140
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
141 bytes_of_encoded_len = contents_len & 0x7f;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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142 contents_len = 0;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
143
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
144 switch (bytes_of_encoded_len) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
145 case 4:
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
146 contents_len |= *bp++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
147 contents_len <<= 8;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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148 /* fallthru */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
149 case 3:
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
150 contents_len |= *bp++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
151 contents_len <<= 8;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
152 /* fallthru */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
153 case 2:
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
154 contents_len |= *bp++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
155 contents_len <<= 8;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
156 /* fallthru */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
157 case 1:
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
158 contents_len |= *bp++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
159 break;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
160
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
161 case 0:
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
162 contents_len = der_indefinite_length (bp, end);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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163 if (contents_len)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
164 break;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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165 /* fallthru */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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166 default:
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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167 PORT_SetError(SEC_ERROR_BAD_DER);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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168 return SECFailure;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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169 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
170 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
171
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
172 if ((bp + contents_len) > end) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
173 /* Ran past end of buffer */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
174 PORT_SetError(SEC_ERROR_BAD_DER);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
175 return SECFailure;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
176 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
177
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
178 *header_len_p = bp - buf;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
179 *contents_len_p = contents_len;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
180
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
181 return SECSuccess;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
182 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
183
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
184 SECStatus
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
185 DER_Lengths(SECItem *item, int *header_len_p, PRUint32 *contents_len_p)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
186 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
187 return(der_capture(item->data, &item->data[item->len], header_len_p,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
188 contents_len_p));
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
189 }
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