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bcrypt: Pad exported datums in key_export_dsa_capi().

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Signed-off-by: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Hans Leidekker <hans@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Paul Gofman 2021-01-18 12:38:28 +01:00 committed by Alexandre Julliard
parent 4bf5371011
commit 541356dac5
1 changed files with 12 additions and 16 deletions
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28
dlls/bcrypt/gnutls.c
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@ -1143,8 +1143,8 @@ static NTSTATUS CDECL key_export_dsa_capi( struct key *key, UCHAR *buf, ULONG le
BLOBHEADER *hdr;
DSSPUBKEY *pubkey;
gnutls_datum_t p, q, g, y, x;
UCHAR *src, *dst;
int i, ret, size;
UCHAR *dst;
int ret, size;
if ((ret = pgnutls_privkey_export_dsa_raw( key_data(key)->privkey, &p, &q, &g, &y, &x )))
{
@ -1152,7 +1152,7 @@ static NTSTATUS CDECL key_export_dsa_capi( struct key *key, UCHAR *buf, ULONG le
return STATUS_INTERNAL_ERROR;
}
if ((q.size != 20 && q.size != 21) || (x.size != 20 && x.size != 21))
if (q.size > 21 || x.size > 21)
{
ERR( "can't export key in this format\n" );
free( p.data ); free( q.data ); free( g.data ); free( y.data ); free( x.data );
@ -1174,26 +1174,22 @@ static NTSTATUS CDECL key_export_dsa_capi( struct key *key, UCHAR *buf, ULONG le
pubkey->bitlen = key->u.a.bitlen;
dst = (UCHAR *)(pubkey + 1);
if (p.size % 2) src = p.data + 1;
else src = p.data;
for (i = 0; i < size; i++) dst[i] = src[size - i - 1];
export_gnutls_datum( dst, size, &p, NULL );
reverse_bytes( dst, size );
dst += size;
if (q.size % 2) src = q.data + 1;
else src = q.data;
for (i = 0; i < 20; i++) dst[i] = src[20 - i - 1];
export_gnutls_datum( dst, 20, &q, NULL );
reverse_bytes( dst, 20 );
dst += 20;
if (g.size % 2) src = g.data + 1;
else src = g.data;
for (i = 0; i < size; i++) dst[i] = src[size - i - 1];
export_gnutls_datum( dst, size, &g, NULL );
reverse_bytes( dst, size );
dst += size;
if (x.size % 2) src = x.data + 1;
else src = x.data;
for (i = 0; i < 20; i++) dst[i] = src[20 - i - 1];
export_gnutls_datum( dst, 20, &x, NULL );
reverse_bytes( dst, 20 );
dst += 20;
memcpy( dst, &key->u.a.dss_seed, sizeof(key->u.a.dss_seed) );
}