1#pragma ident	"%Z%%M%	%I%	%E% SMI"
2
3/*
4 * src/lib/krb5/asn.1/asn1_make.c
5 *
6 * Copyright 1994 by the Massachusetts Institute of Technology.
7 * All Rights Reserved.
8 *
9 * Export of this software from the United States of America may
10 *   require a specific license from the United States Government.
11 *   It is the responsibility of any person or organization contemplating
12 *   export to obtain such a license before exporting.
13 *
14 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
15 * distribute this software and its documentation for any purpose and
16 * without fee is hereby granted, provided that the above copyright
17 * notice appear in all copies and that both that copyright notice and
18 * this permission notice appear in supporting documentation, and that
19 * the name of M.I.T. not be used in advertising or publicity pertaining
20 * to distribution of the software without specific, written prior
21 * permission.  Furthermore if you modify this software you must label
22 * your software as modified software and not distribute it in such a
23 * fashion that it might be confused with the original M.I.T. software.
24 * M.I.T. makes no representations about the suitability of
25 * this software for any purpose.  It is provided "as is" without express
26 * or implied warranty.
27 */
28
29#include "asn1_make.h"
30
31asn1_error_code asn1_make_etag(asn1buf *buf, asn1_class asn1class,
32			       asn1_tagnum tagnum, unsigned int in_len,
33			       unsigned int *retlen)
34{
35  return asn1_make_tag(buf,asn1class,CONSTRUCTED,tagnum,in_len,retlen);
36}
37
38
39asn1_error_code asn1_make_tag(asn1buf *buf, asn1_class asn1class,
40			      asn1_construction construction,
41			      asn1_tagnum tagnum, unsigned int in_len,
42			      unsigned int *retlen)
43{
44  asn1_error_code retval;
45  unsigned int sumlen=0, length;
46
47  if(tagnum > ASN1_TAGNUM_MAX) return ASN1_OVERFLOW;
48
49  retval = asn1_make_length(buf,in_len, &length);
50  if(retval) return retval;
51  sumlen += length;
52  retval = asn1_make_id(buf,asn1class,construction,tagnum,&length);
53  if(retval) return retval;
54  sumlen += length;
55
56  *retlen = sumlen;
57  return 0;
58}
59
60asn1_error_code asn1_make_length(asn1buf *buf, const unsigned int in_len, unsigned int *retlen)
61{
62  asn1_error_code retval;
63
64  if(in_len < 128){
65    retval = asn1buf_insert_octet(buf, (asn1_octet)(in_len&0x7F));
66    if(retval) return retval;
67    *retlen = 1;
68  }else{
69    int in_copy=in_len, length=0;
70
71    while(in_copy != 0){
72      retval = asn1buf_insert_octet(buf, (asn1_octet)(in_copy&0xFF));
73      if(retval) return retval;
74      in_copy = in_copy >> 8;
75      length++;
76    }
77    retval = asn1buf_insert_octet(buf, (asn1_octet) (0x80 | (asn1_octet)(length&0x7F)));
78    if(retval) return retval;
79    length++;
80    *retlen = length;
81  }
82
83  return 0;
84}
85
86asn1_error_code asn1_make_id(asn1buf *buf, asn1_class asn1class,
87			     asn1_construction construction,
88			     asn1_tagnum tagnum, unsigned int *retlen)
89{
90  asn1_error_code retval;
91
92  if(tagnum < 31) {
93    retval = asn1buf_insert_octet(buf, (asn1_octet) (asn1class | construction |
94						     (asn1_octet)tagnum));
95    if(retval) return retval;
96    *retlen = 1;
97  }else{
98    asn1_tagnum tagcopy = tagnum;
99    int length = 0;
100
101    retval = asn1buf_insert_octet(buf, (asn1_octet)(tagcopy&0x7F));
102    if(retval) return retval;
103    tagcopy >>= 7;
104    length++;
105
106    for(; tagcopy != 0; tagcopy >>= 7){
107      retval = asn1buf_insert_octet(buf, (asn1_octet) (0x80 | (asn1_octet)(tagcopy&0x7F)));
108      if(retval) return retval;
109      length++;
110    }
111
112    retval = asn1buf_insert_octet(buf, (asn1_octet) (asn1class | construction | 0x1F));
113    if(retval) return retval;
114    length++;
115    *retlen = length;
116  }
117
118  return 0;
119}
120
121asn1_error_code asn1_make_sequence(asn1buf *buf, const unsigned int seq_len, unsigned int *retlen)
122{
123  asn1_error_code retval;
124  unsigned int len, sum=0;
125
126  retval = asn1_make_length(buf,seq_len,&len);
127  if(retval) return retval;
128  sum += len;
129  retval = asn1_make_id(buf,UNIVERSAL,CONSTRUCTED,ASN1_SEQUENCE,&len);
130  if(retval) return retval;
131  sum += len;
132
133  *retlen = sum;
134  return 0;
135}
136
137asn1_error_code asn1_make_set(asn1buf *buf, const unsigned int set_len, unsigned int *retlen)
138{
139  asn1_error_code retval;
140  unsigned int len, sum=0;
141
142  retval = asn1_make_length(buf,set_len,&len);
143  if(retval) return retval;
144  sum += len;
145  retval = asn1_make_id(buf,UNIVERSAL,CONSTRUCTED,ASN1_SET,&len);
146  if(retval) return retval;
147  sum += len;
148
149  *retlen = sum;
150  return 0;
151}
152
153asn1_error_code asn1_make_string(asn1buf *buf, const unsigned int length, const char *string, int *retlen)
154{
155  asn1_error_code retval;
156
157  retval = asn1buf_insert_charstring(buf,length,string);
158  if(retval) return retval;
159
160  *retlen = length;
161  return 0;
162}
163