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buffer.c: Support 'F' for padded bignums

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Signed-off-by: Simon Josefsson <simon@josefsson.org>
Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Sahana Prasad <sahana@redhat.com>
This commit is contained in:
Simon Josefsson
2023-08-20 21:23:32 +02:00
committed by Jakub Jelen
parent 16fd55b4b2
commit fbf02d5936
1 changed files with 18 additions and 2 deletions
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20
src/buffer.c
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@@ -872,13 +872,20 @@ static int ssh_buffer_pack_allocate_va(struct ssh_buffer_struct *buffer,
va_arg(ap, void *);
count++; /* increase argument count */
break;
case 'F':
case 'B':
va_arg(ap, bignum);
/*
* Use a fixed size for a bignum
* (they should normally be around 32)
*/
needed_size += 64;
if (*p == 'F') {
len = va_arg(ap, size_t);
count++; /* increase argument count */
needed_size += sizeof(uint32_t) + len;
} else {
needed_size += 64;
}
break;
case 't':
cstring = va_arg(ap, char *);
@@ -1008,9 +1015,16 @@ ssh_buffer_pack_va(struct ssh_buffer_struct *buffer,
rc = ssh_buffer_add_data(buffer, o.data, (uint32_t)len);
o.data = NULL;
break;
case 'F':
case 'B':
b = va_arg(ap, bignum);
o.string = ssh_make_bignum_string(b);
if (*p == 'F') {
len = va_arg(ap, size_t);
count++; /* increase argument count */
o.string = ssh_make_padded_bignum_string(b, len);
} else {
o.string = ssh_make_bignum_string(b);
}
if(o.string == NULL){
rc = SSH_ERROR;
break;
@@ -1066,6 +1080,8 @@ ssh_buffer_pack_va(struct ssh_buffer_struct *buffer,
* 'P': size_t, void * (len of data, pointer to data)
* only pushes data.
* 'B': bignum (pushed as SSH string)
* 'F': bignum, size_t (bignum, padded to fixed length,
* pushed as SSH string)
* @returns SSH_OK on success
* SSH_ERROR on error
* @warning when using 'P' with a constant size (e.g. 8), do not