52 lines
2.0 KiB
C
52 lines
2.0 KiB
C
#include "exposure-notification.h"
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#include "time.h"
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int main(int argc, char **argv) {
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// first init everything
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// TODO: More randomization, we init with NULL to let en init mbdet entropy for us
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en_init(NULL);
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// get the currentTime
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time_t currentTime = time(NULL);
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// The periodKey changes each EN_TEK_ROLLING_PERIOD intervals
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ENIntervalNumber periodInterval = en_get_interval_number_at_period_start(currentTime);
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ENPeriodKey periodKey;
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ENPeriodIdentifierKey periodIdentifierKey;
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ENPeriodMetadataEncryptionKey periodMetadaEncryptionKey;
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// setup period keys at the beginning
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// in theory you could let them generate automatically setting periodInterval to 0
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en_generate_and_derive_period_keys(&periodKey, &periodIdentifierKey, &periodMetadaEncryptionKey);
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char metadata[128] = "";
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while(1) {
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// we check the current time to know if we actually need to regenerate anything
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currentTime = time(NULL);
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ENIntervalNumber currentInterval = en_get_interval_number(currentTime);
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// we check if we need to generate new keys
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if (currentInterval - periodInterval >= EN_TEK_ROLLING_PERIOD) {
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periodInterval = en_get_interval_number_at_period_start(currentTime);
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en_generate_and_derive_period_keys(&periodKey, &periodIdentifierKey, &periodMetadaEncryptionKey);
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// TODO: Store new periodKey with periodInterval
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}
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// we now generate the new interval identifier and re-encrypt the metadata
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ENIntervalIdentifier intervalIdentifier;
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en_derive_interval_identifier(&intervalIdentifier, &periodIdentifierKey, currentInterval);
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char encryptedMetadata[sizeof(metadata)];
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en_encrypt_interval_metadata(&periodMetadaEncryptionKey, &intervalIdentifier, metadata, encryptedMetadata, sizeof(metadata));
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// broadcast intervalIdentifier plus encryptedMetada according to specs
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// TODO: receive packets and store them
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// repeat for 10-20 minutes
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}
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return 0;
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} |