mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-11 10:20:19 +01:00
44b7f056d9
bug1001332, 56b691c003ad, bug1086145, bug1054069, bug1155922, bug991783, bug1125025, bug1162521, bug1162644, bug1132941, bug1164364, bug1166205, bug1166163, bug1166515, bug1138554, bug1167046, bug1167043, bug1169451, bug1172128, bug1170322, bug102794, bug1128184, bug557830, bug1174648, bug1180244, bug1177784, bug1173413, bug1169174, bug1084669, bug951455, bug1183395, bug1177430, bug1183827, bug1160139, bug1154106, bug1142209, bug1185033, bug1193467, bug1182667(with sha512 changes backed out, which breaks VC6 compilation), bug1158489, bug337796
190 lines
4.2 KiB
C
190 lines
4.2 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "secder.h"
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#include "secerr.h"
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static PRUint32
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der_indefinite_length(unsigned char *buf, unsigned char *end)
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{
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PRUint32 len, ret, dataLen;
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unsigned char tag, lenCode;
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int dataLenLen;
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len = 0;
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while ( 1 ) {
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if ((buf + 2) > end) {
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return(0);
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}
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tag = *buf++;
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lenCode = *buf++;
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len += 2;
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if ( ( tag == 0 ) && ( lenCode == 0 ) ) {
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return(len);
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}
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if ( lenCode == 0x80 ) { /* indefinite length */
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ret = der_indefinite_length(buf, end); /* recurse to find length */
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if (ret == 0)
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return 0;
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len += ret;
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buf += ret;
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} else { /* definite length */
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if (lenCode & 0x80) {
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/* Length of data is in multibyte format */
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dataLenLen = lenCode & 0x7f;
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switch (dataLenLen) {
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case 1:
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dataLen = buf[0];
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break;
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case 2:
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dataLen = (buf[0]<<8)|buf[1];
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break;
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case 3:
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dataLen = ((unsigned long)buf[0]<<16)|(buf[1]<<8)|buf[2];
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break;
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case 4:
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dataLen = ((unsigned long)buf[0]<<24)|
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((unsigned long)buf[1]<<16)|(buf[2]<<8)|buf[3];
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break;
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default:
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PORT_SetError(SEC_ERROR_BAD_DER);
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return SECFailure;
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}
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} else {
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/* Length of data is in single byte */
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dataLen = lenCode;
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dataLenLen = 0;
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}
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/* skip this item */
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buf = buf + dataLenLen + dataLen;
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len = len + dataLenLen + dataLen;
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}
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}
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}
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/*
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** Capture the next thing in the buffer.
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** Returns the length of the header and the length of the contents.
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*/
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static SECStatus
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der_capture(unsigned char *buf, unsigned char *end,
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int *header_len_p, PRUint32 *contents_len_p)
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{
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unsigned char *bp;
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unsigned char whole_tag;
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PRUint32 contents_len;
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int tag_number;
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if ((buf + 2) > end) {
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*header_len_p = 0;
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*contents_len_p = 0;
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if (buf == end)
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return SECSuccess;
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return SECFailure;
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}
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bp = buf;
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/* Get tag and verify that it is ok. */
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whole_tag = *bp++;
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tag_number = whole_tag & DER_TAGNUM_MASK;
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/*
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* XXX This code does not (yet) handle the high-tag-number form!
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*/
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if (tag_number == DER_HIGH_TAG_NUMBER) {
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PORT_SetError(SEC_ERROR_BAD_DER);
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return SECFailure;
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}
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if ((whole_tag & DER_CLASS_MASK) == DER_UNIVERSAL) {
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/* Check that the universal tag number is one we implement. */
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switch (tag_number) {
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case DER_BOOLEAN:
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case DER_INTEGER:
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case DER_BIT_STRING:
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case DER_OCTET_STRING:
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case DER_NULL:
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case DER_OBJECT_ID:
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case DER_SEQUENCE:
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case DER_SET:
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case DER_PRINTABLE_STRING:
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case DER_T61_STRING:
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case DER_IA5_STRING:
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case DER_VISIBLE_STRING:
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case DER_UTC_TIME:
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case 0: /* end-of-contents tag */
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break;
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default:
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PORT_SetError(SEC_ERROR_BAD_DER);
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return SECFailure;
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}
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}
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/*
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* Get first byte of length code (might contain entire length, might not).
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*/
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contents_len = *bp++;
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/*
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* If the high bit is set, then the length is in multibyte format,
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* or the thing has an indefinite-length.
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*/
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if (contents_len & 0x80) {
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int bytes_of_encoded_len;
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bytes_of_encoded_len = contents_len & 0x7f;
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contents_len = 0;
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switch (bytes_of_encoded_len) {
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case 4:
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contents_len |= *bp++;
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contents_len <<= 8;
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/* fallthru */
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case 3:
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contents_len |= *bp++;
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contents_len <<= 8;
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/* fallthru */
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case 2:
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contents_len |= *bp++;
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contents_len <<= 8;
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/* fallthru */
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case 1:
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contents_len |= *bp++;
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break;
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case 0:
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contents_len = der_indefinite_length (bp, end);
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if (contents_len)
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break;
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/* fallthru */
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default:
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PORT_SetError(SEC_ERROR_BAD_DER);
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return SECFailure;
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}
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}
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if ((bp + contents_len) > end) {
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/* Ran past end of buffer */
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PORT_SetError(SEC_ERROR_BAD_DER);
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return SECFailure;
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}
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*header_len_p = (int)(bp - buf);
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*contents_len_p = contents_len;
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return SECSuccess;
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}
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SECStatus
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DER_Lengths(SECItem *item, int *header_len_p, PRUint32 *contents_len_p)
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{
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return(der_capture(item->data, &item->data[item->len], header_len_p,
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contents_len_p));
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}
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