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gpg: Fix compute_fingerprint for ECC with SOS.

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* g10/keyid.c (hash_public_key): Tweak NBITS just as sos_write does.

--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2021-03-12 16:15:04 +09:00
parent 8cad11d13b
commit cfc1497efa
1 changed files with 16 additions and 1 deletions
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17
g10/keyid.c
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@ -180,7 +180,7 @@ hash_public_key (gcry_md_hd_t md, PKT_public_key *pk)
} }
else if (gcry_mpi_get_flag (pk->pkey[i], GCRYMPI_FLAG_OPAQUE)) else if (gcry_mpi_get_flag (pk->pkey[i], GCRYMPI_FLAG_OPAQUE))
{ {
const void *p; const char *p;
int is_sos = 0; int is_sos = 0;
if (gcry_mpi_get_flag (pk->pkey[i], GCRYMPI_FLAG_USER2)) if (gcry_mpi_get_flag (pk->pkey[i], GCRYMPI_FLAG_USER2))
@ -194,6 +194,21 @@ hash_public_key (gcry_md_hd_t md, PKT_public_key *pk)
pp[i] = NULL; pp[i] = NULL;
if (is_sos) if (is_sos)
{ {
if (*p)
{
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;
}
pp[i][0] = (nbits >> 8); pp[i][0] = (nbits >> 8);
pp[i][1] = nbits; pp[i][1] = nbits;
} }