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Fix LeiA epoch overflow vulnerability #1

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Fix LeiA epoch overflow vulnerability #1

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6 changes: 3 additions & 3 deletions can-auth/leia.c
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,9 @@ void VULCAN_FUNC leia_session_key_gen(void)
ASSERT(leia_cur);

// 1. increment epoch
// NOTE: should request new random session key from trusted global
// Attestation Server on epoch counter overflow (see VulCAN paper)
ASSERT(leia_cur->epoch != LEIA_EPOCH_MAX);
leia_cur->epoch++;

// 2. apply the MAC algorithm on the epoch
Expand All @@ -95,9 +98,6 @@ void VULCAN_FUNC leia_update_counters(void)

if (leia_cur->c == LEIA_COUNT_MAX)
{
// NOTE: should request new random session key from trusted global
// Attestation Server on epoch counter overflow (see VulCAN paper)
ASSERT(leia_cur->epoch != LEIA_EPOCH_MAX);
leia_session_key_gen();
}
else
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