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Merge pull request #129 from libtom/fix/gcm_counter_reuse

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GCM counter incrementation isn't stopped at 2^32 blocks, which breaks GCM
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Steffen Jaeckel 2016-10-02 20:51:01 +02:00 committed by GitHub
commit f784793891
1 changed files with 5 additions and 0 deletions
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5
src/encauth/gcm/gcm_process.c
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@ -49,6 +49,11 @@ int gcm_process(gcm_state *gcm,
return err; return err;
} }
/* 0xFFFFFFFE0 = ((2^39)-256)/8 */
if (gcm->pttotlen / 8 + (ulong64)gcm->buflen + (ulong64)ptlen >= CONST64(0xFFFFFFFE0)) {
return CRYPT_INVALID_ARG;
}
/* in AAD mode? */ /* in AAD mode? */
if (gcm->mode == LTC_GCM_MODE_AAD) { if (gcm->mode == LTC_GCM_MODE_AAD) {
/* let's process the AAD */ /* let's process the AAD */