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gpg: Introduce SOS (Simply Octet String) support.

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* g10/build-packet.c (gpg_sos_write): New.
(do_key): Use gpg_sos_write.
(do_signature): Use gpg_sos_write for EdDSA.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2019-11-15 16:24:33 +09:00
parent 5da6925a33
commit 2096965c53
2 changed files with 59 additions and 6 deletions
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60
g10/build-packet.c
View File

@ -364,7 +364,55 @@ gpg_mpi_write (iobuf_t out, gcry_mpi_t a, unsigned int *r_nwritten)
/*
* Write an opaque MPI to the output stream without length info.
* Write the mpi A to the output stream OUT as "SOS" (Simply Octet
* String). If R_NWRITTEN is not NULL the number of bytes written is
* stored there. To only get the number of bytes which would be
* written, NULL may be passed for OUT.
*/
gpg_error_t
gpg_sos_write (iobuf_t out, gcry_mpi_t a, unsigned int *r_nwritten)
{
gpg_error_t err;
unsigned int nwritten = 0;
if (gcry_mpi_get_flag (a, GCRYMPI_FLAG_OPAQUE))
{
unsigned int nbits;
const unsigned char *p;
unsigned char lenhdr[2];
/* gcry_log_debugmpi ("a", a); */
p = gcry_mpi_get_opaque (a, &nbits);
/* gcry_log_debug (" [%u bit]\n", nbits); */
/* gcry_log_debughex (" ", p, (nbits+7)/8); */
lenhdr[0] = nbits >> 8;
lenhdr[1] = nbits;
err = out? iobuf_write (out, lenhdr, 2) : 0;
if (!err)
{
nwritten += 2;
if (p)
{
err = out? iobuf_write (out, p, (nbits+7)/8) : 0;
if (!err)
nwritten += (nbits+7)/8;
}
}
}
else
{
log_info ("non-opaque MPI (%u bits) for SOS\n", gcry_mpi_get_nbits (a));
err = gpg_error (GPG_ERR_INV_DATA);
}
if (r_nwritten)
*r_nwritten = nwritten;
return err;
}
/*
* Write an opaque string to the output stream without length info.
*/
gpg_error_t
gpg_mpi_write_nohdr (iobuf_t out, gcry_mpi_t a)
@ -576,7 +624,7 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
|| (pk->pubkey_algo == PUBKEY_ALGO_ECDH && (i == 0 || i == 2)))
err = gpg_mpi_write_nohdr (a, pk->pkey[i]);
else
err = gpg_mpi_write (a, pk->pkey[i], NULL);
err = gpg_sos_write (a, pk->pkey[i], NULL);
if (err)
goto leave;
}
@ -691,7 +739,7 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
for (j=i; j < nskey; j++ )
{
if ((err = gpg_mpi_write (NULL, pk->pkey[j], &n)))
if ((err = gpg_sos_write (NULL, pk->pkey[j], &n)))
goto leave;
skbytes += n;
}
@ -700,7 +748,7 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
}
for ( ; i < nskey; i++ )
if ( (err = gpg_mpi_write (a, pk->pkey[i], NULL)))
if ( (err = gpg_sos_write (a, pk->pkey[i], NULL)))
goto leave;
write_16 (a, ski->csum );
@ -1696,6 +1744,10 @@ 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] );
if (sig->pubkey_algo == PUBKEY_ALGO_EDDSA)
for (i=0; i < n && !rc ; i++ )
rc = gpg_sos_write (a, sig->data[i], NULL);
else
for (i=0; i < n && !rc ; i++ )
rc = gpg_mpi_write (a, sig->data[i], NULL);

1
g10/packet.h
View File

@ -867,6 +867,7 @@ gpg_error_t build_keyblock_image (kbnode_t keyblock, iobuf_t *r_iobuf);
int build_packet (iobuf_t out, PACKET *pkt);
gpg_error_t build_packet_and_meta (iobuf_t out, PACKET *pkt);
gpg_error_t gpg_mpi_write (iobuf_t out, gcry_mpi_t a, unsigned int *t_nwritten);
gpg_error_t gpg_sos_write (iobuf_t out, gcry_mpi_t a, unsigned int *t_nwritten);
gpg_error_t gpg_mpi_write_nohdr (iobuf_t out, gcry_mpi_t a);
u32 calc_packet_length( PACKET *pkt );
void build_sig_subpkt( PKT_signature *sig, sigsubpkttype_t type,