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120 lines
4.5 KiB
C
120 lines
4.5 KiB
C
// Copyright 2020 Lukas Haubaum
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//
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// Licensed under the GNU Affero General Public License, Version 3;
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// https://www.gnu.org/licenses/agpl-3.0.html
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _ena_CRYPTO_H_
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#define _ena_CRYPTO_H_
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#define ENA_TIME_WINDOW (600) // time window every 10 minutes
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#define ENA_KEY_LENGTH (16) // key length
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#define ENA_AEM_METADATA_LENGTH (4) // size of metadata
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#define ENA_TEK_ROLLING_PERIOD (CONFIG_ENA_TEK_ROLLING_PERIOD) // TEKRollingPeriod
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#include <stdio.h>
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/**
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* @brief initialize cryptography
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*
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* This initialize the cryptography by setting up entropy.
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*/
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void ena_crypto_init(void);
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/**
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* @brief calculate ENIntervalNumber (ENIN) for given UNIX timestamp
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*
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* Source documents (Section: ENIntervalNumber)
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*
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* https://blog.google/documents/69/Exposure_Notification_-_Cryptography_Specification_v1.2.1.pdf
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*
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* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf
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*
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*
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* @param[in] unix_timestamp UNIX Timestamp to calculate ENIN for
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*
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* @return
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* ENIN for given timestamp
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*/
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uint32_t ena_crypto_enin(uint32_t unix_timestamp);
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/**
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* @brief calculate a new random Temporary Exposure Key (TEK)
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*
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* Source documents (Section: Temporary Exposure Key)
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*
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* https://blog.google/documents/69/Exposure_Notification_-_Cryptography_Specification_v1.2.1.pdf
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*
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* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf
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*
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* @param[out] tek pointer to the new TEK
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*/
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void ena_crypto_tek(uint8_t *tek);
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/**
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* @brief calculate a new Rolling Proximity Identifier Key (RPIK) with given TEK
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*
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* Source documents (Section: Rolling Proximity Identifier Key)
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*
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* https://blog.google/documents/69/Exposure_Notification_-_Cryptography_Specification_v1.2.1.pdf
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*
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* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf
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*
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* @param[out] rpik pointer to the new RPIK
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* @param[in] tek TEK for calculating RPIK
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*/
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void ena_crypto_rpik(uint8_t *rpik, uint8_t *tek);
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/**
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* @brief calculate a new Rolling Proximity Identifier with given RPIK and ENIN
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*
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* Source documents (Section: Rolling Proximity Identifier)
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*
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* https://blog.google/documents/69/Exposure_Notification_-_Cryptography_Specification_v1.2.1.pdf
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*
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* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf
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*
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* @param[out] rpi pointer to the new RPI
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* @param[in] rpik RPIK for encrypting RPI
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* @param[in] enin ENIN to encrypt in RPI
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*/
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void ena_crypto_rpi(uint8_t *rpi, uint8_t *rpik, uint32_t enin);
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/**
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* @brief calculate a new Associated Encrypted Metadata Key (AEMK) with given TEK
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*
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* Source documents (Section: Associated Encrypted Metadata Key)
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*
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* https://blog.google/documents/69/Exposure_Notification_-_Cryptography_Specification_v1.2.1.pdf
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*
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* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf
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*
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* @param[out] aemk pointer to the new AEMK
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* @param[in] tek TEK for calculating AEMK
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*/
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void ena_crypto_aemk(uint8_t *aemk, uint8_t *tek);
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/**
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* @brief create Associated Encrypted Metadata (AEM) with given AEMK along the RPI
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*
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* Source documents (Section: Associated Encrypted Metadata)
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*
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* https://blog.google/documents/69/Exposure_Notification_-_Cryptography_Specification_v1.2.1.pdf
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*
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* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf
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*
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* @param[out] aem pointer to the new AEM
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* @param[in] aemk AEMK for encrypting AEM
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* @param[in] rpi RPI for encrypting AEM
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* @param[in] power_level BLE power level to encrypt in AEM
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*/
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void ena_crypto_aem(uint8_t *aem, uint8_t *aemk, uint8_t *rpi, uint8_t power_level);
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#endif |