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ecc-sos,gpg: More fixes for SOS.

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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2020-06-04 18:50:37 +09:00
parent 1e537dd29a
commit 74a79bed4b
4 changed files with 44 additions and 5 deletions
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3
g10/parse-packet.c
View File

@ -2352,7 +2352,8 @@ parse_signature (IOBUF inp, int pkttype, unsigned long pktlen,
for (i = 0; i < ndata; i++) for (i = 0; i < ndata; i++)
{ {
n = pktlen; n = pktlen;
if (sig->pubkey_algo == PUBKEY_ALGO_EDDSA) if (sig->pubkey_algo == PUBKEY_ALGO_ECDSA
|| sig->pubkey_algo == PUBKEY_ALGO_EDDSA)
sig->data[i] = sos_read (inp, &n, 0); sig->data[i] = sos_read (inp, &n, 0);
else else
sig->data[i] = mpi_read (inp, &n, 0); sig->data[i] = mpi_read (inp, &n, 0);

37
g10/pkglue.c
View File

@ -47,6 +47,41 @@ get_mpi_from_sexp (gcry_sexp_t sexp, const char *item, int mpifmt)
} }
gcry_mpi_t
get_sos_from_sexp (gcry_sexp_t sexp, const char *item)
{
gcry_sexp_t list;
size_t buflen;
void *p0;
gcry_mpi_t sos;
unsigned int nbits;
unsigned char *p;
list = gcry_sexp_find_token (sexp, item, 0);
log_assert (list);
p0 = gcry_sexp_nth_buffer (list, 1, &buflen);
log_assert (p0);
nbits = buflen*8;
p = p0;
if (nbits >= 8 && !(*p & 0x80))
if (--nbits >= 7 && !(*p & 0x40))
if (--nbits >= 6 && !(*p & 0x20))
if (--nbits >= 5 && !(*p & 0x10))
if (--nbits >= 4 && !(*p & 0x08))
if (--nbits >= 3 && !(*p & 0x04))
if (--nbits >= 2 && !(*p & 0x02))
if (--nbits >= 1 && !(*p & 0x01))
--nbits;
sos = gcry_mpi_set_opaque (NULL, p0, nbits);
log_assert (sos);
gcry_sexp_release (list);
gcry_mpi_set_flag (sos, GCRYMPI_FLAG_USER2);
return sos;
}
static byte * static byte *
get_data_from_sexp (gcry_sexp_t sexp, const char *item, size_t *r_size) get_data_from_sexp (gcry_sexp_t sexp, const char *item, size_t *r_size)
{ {
@ -360,7 +395,7 @@ pk_encrypt (pubkey_algo_t algo, gcry_mpi_t *resarr, gcry_mpi_t data,
/* Get the shared point and the ephemeral public key. */ /* Get the shared point and the ephemeral public key. */
shared = get_data_from_sexp (s_ciph, "s", &nshared); shared = get_data_from_sexp (s_ciph, "s", &nshared);
public = get_mpi_from_sexp (s_ciph, "e", GCRYMPI_FMT_OPAQUE); public = get_sos_from_sexp (s_ciph, "e");
if (DBG_CRYPTO) if (DBG_CRYPTO)
{ {
log_debug ("ECDH ephemeral key:"); log_debug ("ECDH ephemeral key:");

2
g10/pkglue.h
View File

@ -24,6 +24,8 @@
/*-- pkglue.c --*/ /*-- pkglue.c --*/
gcry_mpi_t get_mpi_from_sexp (gcry_sexp_t sexp, const char *item, int mpifmt); gcry_mpi_t get_mpi_from_sexp (gcry_sexp_t sexp, const char *item, int mpifmt);
gcry_mpi_t get_sos_from_sexp (gcry_sexp_t sexp, const char *item);
int pk_verify (pubkey_algo_t algo, gcry_mpi_t hash, gcry_mpi_t *data, int pk_verify (pubkey_algo_t algo, gcry_mpi_t hash, gcry_mpi_t *data,
gcry_mpi_t *pkey); gcry_mpi_t *pkey);

7
g10/sign.c
View File

@ -505,10 +505,11 @@ do_sign (ctrl_t ctrl, PKT_public_key *pksk, PKT_signature *sig,
else if (pksk->pubkey_algo == GCRY_PK_RSA else if (pksk->pubkey_algo == GCRY_PK_RSA
|| pksk->pubkey_algo == GCRY_PK_RSA_S) || pksk->pubkey_algo == GCRY_PK_RSA_S)
sig->data[0] = get_mpi_from_sexp (s_sigval, "s", GCRYMPI_FMT_USG); sig->data[0] = get_mpi_from_sexp (s_sigval, "s", GCRYMPI_FMT_USG);
else if (openpgp_oid_is_ed25519 (pksk->pkey[0])) else if (pksk->pubkey_algo == PUBKEY_ALGO_ECDSA
|| pksk->pubkey_algo == PUBKEY_ALGO_EDDSA)
{ {
sig->data[0] = get_mpi_from_sexp (s_sigval, "r", GCRYMPI_FMT_OPAQUE); sig->data[0] = get_sos_from_sexp (s_sigval, "r");
sig->data[1] = get_mpi_from_sexp (s_sigval, "s", GCRYMPI_FMT_OPAQUE); sig->data[1] = get_sos_from_sexp (s_sigval, "s");
} }
else else
{ {