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gpg: Fix check_signature2 for opaque MPI.

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* g10/sig-check.c (check_signature2): Handle the case of opaque MPI.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2020-11-02 11:27:26 +09:00
parent 21d8927f79
commit 029ba6dc96
1 changed files with 21 additions and 2 deletions
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23
g10/sig-check.c
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@ -255,7 +255,14 @@ check_signature2 (ctrl_t ctrl,
nbytes = 6;
for (i=0; i < nsig; i++ )
{
if (gcry_mpi_print (GCRYMPI_FMT_PGP, NULL, 0, &n, sig->data[i]))
if (gcry_mpi_get_flag (sig->data[i], GCRYMPI_FLAG_OPAQUE))
{
unsigned int nbits;
gcry_mpi_get_opaque (sig->data[i], &nbits);
n = (nbits+7)/8 + 2;
}
else if (gcry_mpi_print (GCRYMPI_FMT_PGP, NULL, 0, &n, sig->data[i]))
BUG();
nbytes += n;
}
@ -276,7 +283,19 @@ check_signature2 (ctrl_t ctrl,
nbytes -= 6;
for (i=0; i < nsig; i++ )
{
if (gcry_mpi_print (GCRYMPI_FMT_PGP, p, nbytes, &n, sig->data[i]))
if (gcry_mpi_get_flag (sig->data[i], GCRYMPI_FLAG_OPAQUE))
{
const byte *sigdata;
unsigned int nbits;
sigdata = gcry_mpi_get_opaque (sig->data[i], &nbits);
n = (nbits+7)/8;
p[0] = nbits >> 8;
p[1] = (nbits & 0xff);
memcpy (p+2, sigdata, n);
n += 2;
}
else if (gcry_mpi_print (GCRYMPI_FMT_PGP, p, nbytes, &n, sig->data[i]))
BUG();
p += n;
nbytes -= n;