From d451e6a131c6f669a49e45521eec07005ff3364e Mon Sep 17 00:00:00 2001 From: Patrick Rathje Date: Wed, 9 Dec 2020 11:13:51 +0100 Subject: [PATCH] Derive period identifier key --- src/covid.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/src/covid.c b/src/covid.c index 9308037..cd9d8db 100644 --- a/src/covid.c +++ b/src/covid.c @@ -284,11 +284,14 @@ static void check_keys(struct k_work *work) } // we now generate the new interval identifier and re-encrypt the metadata - en_derive_interval_identifier(&intervalIdentifier, &periods[current_period_index].periodKey, currentInterval); - + // TODO: The period identifier key does not need to be derived everytime! + ENPeriodIdentifierKey pik; + en_derive_period_identifier_key(&pik, &periods[current_period_index].periodKey); + en_derive_interval_identifier(&intervalIdentifier, &pik, currentInterval); + en_derive_period_metadata_encryption_key(&periodMetadataEncryptionKey, &periods[current_period_index].periodKey); - - en_encrypt_interval_metadata(&periodMetadataEncryptionKey, &intervalIdentifier, (unsigned char *)&bt_metadata, (unsigned char *)&encryptedMetadata, sizeof(associated_encrypted_metadata_t)); + en_encrypt_interval_metadata(&periodMetadataEncryptionKey, &intervalIdentifier, (unsigned char*)&bt_metadata, (unsigned char*)&encryptedMetadata, sizeof(associated_encrypted_metadata_t)); + // broadcast intervalIdentifier plus encryptedMetada according to specs //printk("\n----------------------------------------\n\n");