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ecc-sos: Compatible mode for SOS.

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* g10/build-packet.c (sos_write): Add an argument COMPAT.  When
COMPAT=1, NBITS specifies number of bits when interpreted as MPI,
except the case when the first octet is zero.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2020-05-14 14:28:39 +09:00
parent 58ad686bfe
commit 93cefe9497
1 changed files with 27 additions and 6 deletions
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33
g10/build-packet.c
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@ -355,7 +355,7 @@ gpg_mpi_write (iobuf_t out, gcry_mpi_t a, unsigned int *r_nwritten)
* written, NULL may be passed for OUT.
*/
static gpg_error_t
sos_write (iobuf_t out, gcry_mpi_t a, unsigned int *r_nwritten)
sos_write (iobuf_t out, gcry_mpi_t a, unsigned int *r_nwritten, int compat)
{
gpg_error_t err;
unsigned int nwritten = 0;
@ -370,6 +370,22 @@ sos_write (iobuf_t out, gcry_mpi_t a, unsigned int *r_nwritten)
p = gcry_mpi_get_opaque (a, &nbits);
/* gcry_log_debug (" [%u bit]\n", nbits); */
/* gcry_log_debughex (" ", p, (nbits+7)/8); */
if (p && *p && compat)
{
nbits = ((nbits + 7) / 8) * 8;
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;
}
lenhdr[0] = nbits >> 8;
lenhdr[1] = nbits;
err = out? iobuf_write (out, lenhdr, 2) : 0;
@ -604,12 +620,13 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
for (i=0; i < npkey; i++ )
{
/* FIXME: For newer curve, sos_write should be called with COMPAT=0. */
if ( (pk->pubkey_algo == PUBKEY_ALGO_ECDSA && (i == 0))
|| (pk->pubkey_algo == PUBKEY_ALGO_EDDSA && (i == 0))
|| (pk->pubkey_algo == PUBKEY_ALGO_ECDH && (i == 0 || i == 2)))
err = gpg_mpi_write_nohdr (a, pk->pkey[i]);
else if (pk->pubkey_algo == PUBKEY_ALGO_ECDH)
err = sos_write (a, pk->pkey[i], NULL);
err = sos_write (a, pk->pkey[i], NULL, 1);
else
err = gpg_mpi_write (a, pk->pkey[i], NULL);
if (err)
@ -724,12 +741,13 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
unsigned int n;
int j;
/* FIXME: For newer curve, sos_write should be called with COMPAT=0. */
for (j=i; j < nskey; j++ )
{
if (pk->pubkey_algo == PUBKEY_ALGO_EDDSA
|| pk->pubkey_algo == PUBKEY_ALGO_ECDH)
{
if ((err = sos_write (NULL, pk->pkey[j], &n)))
if ((err = sos_write (NULL, pk->pkey[j], &n, 1)))
goto leave;
}
else
@ -747,7 +765,8 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
if (pk->pubkey_algo == PUBKEY_ALGO_EDDSA
|| pk->pubkey_algo == PUBKEY_ALGO_ECDH)
{
if ( (err = sos_write (a, pk->pkey[i], NULL)))
/* FIXME: For newer curve, sos_write should be called with COMPAT=0. */
if ( (err = sos_write (a, pk->pkey[i], NULL, 1)))
goto leave;
}
else
@ -869,7 +888,8 @@ do_pubkey_enc( IOBUF out, int ctb, PKT_pubkey_enc *enc )
if (enc->pubkey_algo == PUBKEY_ALGO_ECDH && i == 1)
rc = gpg_mpi_write_nohdr (a, enc->data[i]);
else if (enc->pubkey_algo == PUBKEY_ALGO_ECDH)
rc = sos_write (a, enc->data[i], NULL);
/* FIXME: For newer curve, sos_write should be called with COMPAT=0. */
rc = sos_write (a, enc->data[i], NULL, 1);
else
rc = gpg_mpi_write (a, enc->data[i], NULL);
}
@ -1749,9 +1769,10 @@ do_signature( IOBUF out, int ctb, PKT_signature *sig )
n = pubkey_get_nsig( sig->pubkey_algo );
if ( !n )
write_fake_data( a, sig->data[0] );
/* FIXME: For newer curve, sos_write should be called with COMPAT=0. */
if (sig->pubkey_algo == PUBKEY_ALGO_EDDSA)
for (i=0; i < n && !rc ; i++ )
rc = sos_write (a, sig->data[i], NULL);
rc = sos_write (a, sig->data[i], NULL, 1);
else
for (i=0; i < n && !rc ; i++ )
rc = gpg_mpi_write (a, sig->data[i], NULL);