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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* src/lib/krb5/asn.1/asn1_make.c
*
* Copyright 1994 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "asn1_make.h"
asn1_error_code
asn1_make_etag(asn1buf *buf, asn1_class asn1class, asn1_tagnum tagnum,
unsigned int in_len, unsigned int *retlen)
{
return asn1_make_tag(buf,asn1class,CONSTRUCTED,tagnum,in_len,retlen);
}
asn1_error_code
asn1_make_tag(asn1buf *buf, asn1_class asn1class,
asn1_construction construction, asn1_tagnum tagnum,
unsigned int in_len, unsigned int *retlen)
{
asn1_error_code retval;
unsigned int sumlen=0, length;
if (tagnum > ASN1_TAGNUM_MAX) return ASN1_OVERFLOW;
retval = asn1_make_length(buf,in_len, &length);
if (retval) return retval;
sumlen += length;
retval = asn1_make_id(buf,asn1class,construction,tagnum,&length);
if (retval) return retval;
sumlen += length;
*retlen = sumlen;
return 0;
}
asn1_error_code
asn1_make_length(asn1buf *buf, const unsigned int in_len, unsigned int *retlen)
{
asn1_error_code retval;
if (in_len < 128) {
retval = asn1buf_insert_octet(buf, (asn1_octet)(in_len&0x7F));
if (retval) return retval;
*retlen = 1;
} else {
int in_copy=in_len, length=0;
while (in_copy != 0) {
retval = asn1buf_insert_octet(buf, (asn1_octet)(in_copy&0xFF));
if (retval) return retval;
in_copy = in_copy >> 8;
length++;
}
retval = asn1buf_insert_octet(buf, (asn1_octet) (0x80 | (asn1_octet)(length&0x7F)));
if (retval) return retval;
length++;
*retlen = length;
}
return 0;
}
asn1_error_code
asn1_make_id(asn1buf *buf, asn1_class asn1class,
asn1_construction construction, asn1_tagnum tagnum,
unsigned int *retlen)
{
asn1_error_code retval;
if (tagnum < 31) {
retval = asn1buf_insert_octet(buf, (asn1_octet) (asn1class | construction |
(asn1_octet)tagnum));
if (retval) return retval;
*retlen = 1;
} else {
asn1_tagnum tagcopy = tagnum;
int length = 0;
retval = asn1buf_insert_octet(buf, (asn1_octet)(tagcopy&0x7F));
if (retval) return retval;
tagcopy >>= 7;
length++;
for (; tagcopy != 0; tagcopy >>= 7) {
retval = asn1buf_insert_octet(buf, (asn1_octet) (0x80 | (asn1_octet)(tagcopy&0x7F)));
if (retval) return retval;
length++;
}
retval = asn1buf_insert_octet(buf, (asn1_octet) (asn1class | construction | 0x1F));
if (retval) return retval;
length++;
*retlen = length;
}
return 0;
}
asn1_error_code
asn1_make_sequence(asn1buf *buf, const unsigned int seq_len,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int len, sum=0;
retval = asn1_make_length(buf,seq_len,&len);
if (retval) return retval;
sum += len;
retval = asn1_make_id(buf,UNIVERSAL,CONSTRUCTED,ASN1_SEQUENCE,&len);
if (retval) return retval;
sum += len;
*retlen = sum;
return 0;
}
asn1_error_code
asn1_make_set(asn1buf *buf, const unsigned int set_len, unsigned int *retlen)
{
asn1_error_code retval;
unsigned int len, sum=0;
retval = asn1_make_length(buf,set_len,&len);
if (retval) return retval;
sum += len;
retval = asn1_make_id(buf,UNIVERSAL,CONSTRUCTED,ASN1_SET,&len);
if (retval) return retval;
sum += len;
*retlen = sum;
return 0;
}
asn1_error_code
asn1_make_string(asn1buf *buf, const unsigned int length, const char *string,
int *retlen)
{
asn1_error_code retval;
retval = asn1buf_insert_charstring(buf,length,string);
if (retval) return retval;
*retlen = length;
return 0;
}
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