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Dependencies

Hunter package manager

Hunter is CMake-driven cross-platform package manager for C++ projects. See documentation at https://docs.hunter.sh.

Security aspects

A project that uses Hunter first downloads the hunter package itself. This is done with a help of HunterGate CMake module. A copy of the HunterGate module is included in the main project. The HunterGate is ordered to download specified release of Hunter and to check whenever the downloaded sources match the checksum provided to the HunterGate invocation.

A Hunter release contains a full list of provided packages and their versions, also with checksums. Every downloaded source code of a package is verified with the checksum.

The HunterGate and selected release of Hunter can be audited to check that the expected source code of dependencies is downloaded. The audit of any new Hunter release has to be repeated in case the main project is to upgrade the Hunter version.

Hunter has an option to download cached binaries from specified cache server instead of building packages from source. This option is enabled by default. Because checksums of binaries are not know up front the main project can be at risk in case the cache server is compromised. In cpp-ethereum we decided to use only the cache server controlled by Ethereum C++ team located in https://github.com/ethereum/hunter-cache.