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Fix GMAC for multiples of key refresh

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This commit is contained in:
Florian Märkl 2019-04-12 23:44:31 +02:00
commit 0dac2bc4fb
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2 changed files with 54 additions and 6 deletions
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8
lib/src/gkcrypt.c
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@ -191,12 +191,8 @@ CHIAKI_EXPORT ChiakiErrorCode chiaki_gkcrypt_gmac(ChiakiGKCrypt *gkcrypt, size_t
uint8_t *gmac_key = gkcrypt->key_gmac_current;
uint8_t gmac_key_tmp[CHIAKI_GKCRYPT_BLOCK_SIZE];
uint64_t key_index = key_pos / CHIAKI_GKCRYPT_GMAC_KEY_REFRESH_KEY_POS;
if(key_index != (key_pos + buf_size - 1) / CHIAKI_GKCRYPT_GMAC_KEY_REFRESH_KEY_POS)
{
CHIAKI_LOGD(gkcrypt->log, "SPLIT! %u != %u\n", key_index, (key_pos + buf_size - 1) / CHIAKI_GKCRYPT_GMAC_KEY_REFRESH_KEY_POS);
}
// TODO: what to do if (key_pos / CHIAKI_GKCRYPT_GMAC_KEY_REFRESH_KEY_POS) != ((key_pos + buf_size) / CHIAKI_GKCRYPT_GMAC_KEY_REFRESH_KEY_POS)?
uint64_t key_index = (key_pos > 0 ? key_pos - 1 : 0) / CHIAKI_GKCRYPT_GMAC_KEY_REFRESH_KEY_POS;
if(key_index > gkcrypt->key_gmac_index_current)
{
chiaki_gkcrypt_gen_new_gmac_key(gkcrypt, key_index);