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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
*/
#include <stdarg.h>
#include "mycrypt.h"
/* store multiple mp_ints in DER INTEGER format to the dst, will not
* overflow the length you give it [outlen] and store the number of
* bytes used in [outlen]
*/
int der_put_multi_integer(unsigned char *dst, unsigned long *outlen,
mp_int *num, ...)
{
va_list args;
mp_int *next;
unsigned long wrote, len;
int err;
_ARGCHK(dst != NULL);
_ARGCHK(outlen != NULL);
/* setup va list */
next = num;
len = *outlen;
wrote = 0;
va_start(args, num);
while (next != NULL) {
if ((err = der_encode_integer(next, dst, outlen)) != CRYPT_OK) {
va_end(args);
return err;
}
wrote += *outlen;
dst += *outlen;
len -= *outlen;
*outlen = len;
next = va_arg(args, mp_int*);
}
va_end(args);
*outlen = wrote;
return CRYPT_OK;
}
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