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/*
* src/lib/krb5/asn.1/asn1_encode.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.
*/
/* ASN.1 primitive encoders */
#include "asn1_encode.h"
#include "asn1_make.h"
static asn1_error_code asn1_encode_integer_internal(asn1buf *buf, long val,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length = 0;
long valcopy;
int digit;
valcopy = val;
do {
digit = (int) (valcopy&0xFF);
retval = asn1buf_insert_octet(buf,(asn1_octet) digit);
if(retval) return retval;
length++;
valcopy = valcopy >> 8;
} while (valcopy != 0 && valcopy != ~0);
if((val > 0) && ((digit&0x80) == 0x80)) { /* make sure the high bit is */
retval = asn1buf_insert_octet(buf,0); /* of the proper signed-ness */
if(retval) return retval;
length++;
}else if((val < 0) && ((digit&0x80) != 0x80)){
retval = asn1buf_insert_octet(buf,0xFF);
if(retval) return retval;
length++;
}
*retlen = length;
return 0;
}
asn1_error_code asn1_encode_integer(asn1buf * buf, long val,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length = 0;
unsigned int partlen;
retval = asn1_encode_integer_internal(buf, val, &partlen);
if (retval) return retval;
length = partlen;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_INTEGER,length, &partlen);
if(retval) return retval;
length += partlen;
*retlen = length;
return 0;
}
asn1_error_code
asn1_encode_enumerated(asn1buf * buf, const long val,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length = 0;
unsigned int partlen;
retval = asn1_encode_integer_internal(buf, val, &partlen);
if (retval) return retval;
length = partlen;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_ENUMERATED,length, &partlen);
if(retval) return retval;
length += partlen;
*retlen = length;
return 0;
}
asn1_error_code asn1_encode_unsigned_integer(asn1buf *buf, unsigned long val,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length = 0;
unsigned int partlen;
unsigned long valcopy;
int digit;
valcopy = val;
do {
digit = (int) (valcopy&0xFF);
retval = asn1buf_insert_octet(buf,(asn1_octet) digit);
if(retval) return retval;
length++;
valcopy = valcopy >> 8;
} while (valcopy != 0 && valcopy != ~0);
if(digit&0x80) { /* make sure the high bit is */
retval = asn1buf_insert_octet(buf,0); /* of the proper signed-ness */
if(retval) return retval;
length++;
}
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_INTEGER,length, &partlen);
if(retval) return retval;
length += partlen;
*retlen = length;
return 0;
}
asn1_error_code asn1_encode_oid(asn1buf *buf, unsigned int len,
const asn1_octet *val,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length;
retval = asn1buf_insert_octetstring(buf, len, val);
if (retval) return retval;
retval = asn1_make_tag(buf, UNIVERSAL, PRIMITIVE, ASN1_OBJECTIDENTIFIER,
len, &length);
if (retval) return retval;
*retlen = len + length;
return 0;
}
asn1_error_code asn1_encode_octetstring(asn1buf *buf, unsigned int len,
const asn1_octet *val,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length;
retval = asn1buf_insert_octetstring(buf,len,val);
if(retval) return retval;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_OCTETSTRING,len,&length);
if(retval) return retval;
*retlen = len + length;
return 0;
}
asn1_error_code asn1_encode_charstring(asn1buf *buf, unsigned int len,
const char *val, unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length;
retval = asn1buf_insert_charstring(buf,len,val);
if(retval) return retval;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_OCTETSTRING,len,&length);
if(retval) return retval;
*retlen = len + length;
return 0;
}
asn1_error_code asn1_encode_null(asn1buf *buf, int *retlen)
{
asn1_error_code retval;
retval = asn1buf_insert_octet(buf,0x00);
if(retval) return retval;
retval = asn1buf_insert_octet(buf,0x05);
if(retval) return retval;
*retlen = 2;
return 0;
}
asn1_error_code asn1_encode_printablestring(asn1buf *buf, unsigned int len,
const char *val, int *retlen)
{
asn1_error_code retval;
unsigned int length;
retval = asn1buf_insert_charstring(buf,len,val);
if(retval) return retval;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_PRINTABLESTRING,len, &length);
if(retval) return retval;
*retlen = len + length;
return 0;
}
asn1_error_code asn1_encode_ia5string(asn1buf *buf, unsigned int len,
const char *val, int *retlen)
{
asn1_error_code retval;
unsigned int length;
retval = asn1buf_insert_charstring(buf,len,val);
if(retval) return retval;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_IA5STRING,len, &length);
if(retval) return retval;
*retlen = len + length;
return 0;
}
asn1_error_code asn1_encode_generaltime(asn1buf *buf, time_t val,
unsigned int *retlen)
{
asn1_error_code retval;
struct tm *gtime;
char s[16];
unsigned int length, sum=0;
time_t gmt_time = val;
gtime = gmtime(&gmt_time);
/*
* Time encoding: YYYYMMDDhhmmssZ
*
* Sanity check this just to be paranoid, as gmtime can return NULL,
* and some bogus implementations might overrun on the sprintf.
*/
if (gtime == NULL ||
gtime->tm_year > 8099 || gtime->tm_mon > 11 ||
gtime->tm_mday > 31 || gtime->tm_hour > 23 ||
gtime->tm_min > 59 || gtime->tm_sec > 59)
return ASN1_BAD_GMTIME;
sprintf(s, "%04d%02d%02d%02d%02d%02dZ",
1900+gtime->tm_year, gtime->tm_mon+1, gtime->tm_mday,
gtime->tm_hour, gtime->tm_min, gtime->tm_sec);
retval = asn1buf_insert_charstring(buf,15,s);
if(retval) return retval;
sum = 15;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_GENERALTIME,sum,&length);
if(retval) return retval;
sum += length;
*retlen = sum;
return 0;
}
asn1_error_code asn1_encode_generalstring(asn1buf *buf, unsigned int len,
const char *val,
unsigned int *retlen)
{
asn1_error_code retval;
unsigned int length;
retval = asn1buf_insert_charstring(buf,len,val);
if(retval) return retval;
retval = asn1_make_tag(buf,UNIVERSAL,PRIMITIVE,ASN1_GENERALSTRING,len,
&length);
if(retval) return retval;
*retlen = len + length;
return 0;
}
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