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Fix RC4 decryption on big-endian platforms

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This commit is contained in:
Evan Miller 2021-07-17 10:13:24 -04:00
parent 45779d03ff
commit f79f942d1f
1 changed files with 7 additions and 6 deletions
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13
src/libmdb/file.c
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@ -171,10 +171,8 @@ static MdbHandle *mdb_handle_from_stream(FILE *stream, MdbFileFlags flags) {
return NULL; return NULL;
} }
guint32 tmp_key = 0x6b39dac7; unsigned char tmp_key[4] = { 0xC7, 0xDA, 0x39, 0x6B };
mdbi_rc4( mdbi_rc4(tmp_key, sizeof(tmp_key),
(unsigned char *)&tmp_key,
4,
mdb->pg_buf + 0x18, mdb->pg_buf + 0x18,
mdb->f->jet_version == MDB_VER_JET3 ? 126 : 128 mdb->f->jet_version == MDB_VER_JET3 ? 126 : 128
); );
@ -376,8 +374,11 @@ static ssize_t _mdb_read_pg(MdbHandle *mdb, void *pg_buf, unsigned long pg)
*/ */
if (pg != 0 && mdb->f->db_key != 0) if (pg != 0 && mdb->f->db_key != 0)
{ {
unsigned int tmp_key = mdb->f->db_key ^ pg; guint32 tmp_key_i = mdb->f->db_key ^ pg;
mdbi_rc4((unsigned char*)&tmp_key, 4, pg_buf, mdb->fmt->pg_size); unsigned char tmp_key[4] = {
tmp_key_i & 0xFF, (tmp_key_i >> 8) & 0xFF,
(tmp_key_i >> 16) & 0xFF, (tmp_key_i >> 24) & 0xFF };
mdbi_rc4(tmp_key, sizeof(tmp_key), pg_buf, mdb->fmt->pg_size);
} }
return mdb->fmt->pg_size; return mdb->fmt->pg_size;