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ecc-sos: Add special leading zero octet removal.

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* agent/cvt-openpgp.c (extract_private_key): Remove leading zeros.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2020-05-27 12:06:27 +09:00
parent 6d226ec8bd
commit 1c4291c395
1 changed files with 41 additions and 9 deletions
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50
agent/cvt-openpgp.c
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@ -1247,7 +1247,7 @@ extract_private_key (gcry_sexp_t s_key, int req_private_key_data,
gpg_error_t err;
gcry_sexp_t list, l2;
char *name;
const char *algoname, *format, *elems;
const char *algoname, *format;
int npkey, nskey;
gcry_sexp_t curve = NULL;
gcry_sexp_t flags = NULL;
@ -1292,7 +1292,7 @@ extract_private_key (gcry_sexp_t s_key, int req_private_key_data,
if (!strcmp (name, "rsa"))
{
algoname = "rsa";
format = elems = "ned?p?q?u?";
format = "ned?p?q?u?";
npkey = 2;
nskey = 6;
err = gcry_sexp_extract_param (list, NULL, format,
@ -1302,7 +1302,7 @@ extract_private_key (gcry_sexp_t s_key, int req_private_key_data,
else if (!strcmp (name, "elg"))
{
algoname = "elg";
format = elems = "pgyx?";
format = "pgyx?";
npkey = 3;
nskey = 4;
err = gcry_sexp_extract_param (list, NULL, format,
@ -1312,7 +1312,7 @@ extract_private_key (gcry_sexp_t s_key, int req_private_key_data,
else if (!strcmp (name, "dsa"))
{
algoname = "dsa";
format = elems = "pqgyx?";
format = "pqgyx?";
npkey = 4;
nskey = 5;
err = gcry_sexp_extract_param (list, NULL, format,
@ -1322,14 +1322,46 @@ extract_private_key (gcry_sexp_t s_key, int req_private_key_data,
else if (!strcmp (name, "ecc") || !strcmp (name, "ecdsa"))
{
algoname = "ecc";
format = "/qd?";
elems = "qd?";
format = "qd?";
npkey = 1;
nskey = 2;
curve = gcry_sexp_find_token (list, "curve", 0);
flags = gcry_sexp_find_token (list, "flags", 0);
err = gcry_sexp_extract_param (list, NULL, format,
array+0, array+1, NULL);
l2 = gcry_sexp_find_token (list, "q", 0);
if (l2)
{
err = 0;
array[0] = gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_OPAQUE);
gcry_sexp_release (l2);
array[1] = NULL;
l2 = gcry_sexp_find_token (list, "d", 0);
if (l2)
{
size_t n;
char *p = gcry_sexp_nth_buffer (l2, 1, &n);
if (p)
{
const char *p1 = p;
/* Remove leading zero octet, if any. */
if ((n & 1) && !*p)
{
n--;
p1++;
}
array[1] = gcry_mpi_set_opaque_copy (NULL, p1, n*8);
xfree (p);
}
gcry_sexp_release (l2);
}
}
else
err = gpg_error (GPG_ERR_NO_OBJ);
}
else
{
@ -1347,7 +1379,7 @@ extract_private_key (gcry_sexp_t s_key, int req_private_key_data,
{
*r_algoname = algoname;
if (r_elems)
*r_elems = elems;
*r_elems = format;
*r_npkey = npkey;
if (r_nskey)
*r_nskey = nskey;