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g10: Avoid an unnecessary copy.

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* g10/sig-check.c (signature_check2): Avoid copying PK to RET_PK.
Instead, directly use the provided storage.  If none is provided
allocate some.

--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
This commit is contained in:
Neal H. Walfield 2015-09-23 20:50:03 +02:00
parent 5c067d54d3
commit 12443eafa6
1 changed files with 20 additions and 4 deletions
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24
g10/sig-check.c
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@ -60,10 +60,18 @@ signature_check (PKT_signature *sig, gcry_md_hd_t digest)
int
signature_check2 (PKT_signature *sig, gcry_md_hd_t digest, u32 *r_expiredate,
int *r_expired, int *r_revoked, PKT_public_key *ret_pk )
int *r_expired, int *r_revoked, PKT_public_key *pk )
{
PKT_public_key *pk = xmalloc_clear( sizeof *pk );
int rc=0;
int pk_internal;
if (pk)
pk_internal = 0;
else
{
pk_internal = 1;
pk = xmalloc_clear( sizeof *pk );
}
if ( (rc=openpgp_md_test_algo(sig->digest_algo)) )
; /* We don't have this digest. */
@ -91,7 +99,7 @@ signature_check2 (PKT_signature *sig, gcry_md_hd_t digest, u32 *r_expiredate,
if(r_expiredate)
*r_expiredate = pk->expiredate;
rc = do_check( pk, sig, digest, r_expired, r_revoked, ret_pk );
rc = do_check( pk, sig, digest, r_expired, r_revoked, NULL );
/* Check the backsig. This is a 0x19 signature from the
subkey on the primary key. The idea here is that it should
@ -122,7 +130,15 @@ signature_check2 (PKT_signature *sig, gcry_md_hd_t digest, u32 *r_expiredate,
}
}
free_public_key( pk );
if (pk_internal || rc)
{
release_public_key_parts (pk);
if (pk_internal)
xfree (pk);
else
/* Be very sure that the caller doesn't try to use *PK. */
memset (pk, 0, sizeof (*pk));
}
if( !rc && sig->sig_class < 2 && is_status_enabled() ) {
/* This signature id works best with DLP algorithms because