65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
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#pragma once
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#include <vanetza/security/hashed_id.hpp>
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#include <vanetza/security/v3/certificate.hpp>
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#include <unordered_map>
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#include <unordered_set>
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namespace vanetza
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{
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namespace security
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{
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namespace v3
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{
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/**
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* CertificateCache stores validated v1.3.1 certificates for later lookup.
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* Required for checking messages' signatures containing only a certificate digest.
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*/
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class CertificateCache
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{
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public:
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/**
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* Lookup certificate based on given digest
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* \param digest certificate digest
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* \return certificate matching digest
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*/
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const Certificate* lookup(const HashedId8& digest) const;
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const Certificate* lookup(const HashedId3& digest) const;
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/**
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* Store a (pre-validated) certificate in cache
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* \param cert certificate
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*/
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void store(Certificate cert);
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size_t size() const { return m_storage.size(); }
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/**
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* Announce a station with a given certificate digest.
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* \param digest certificate digest
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* \return true if digest was not known before
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*/
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bool announce(const HashedId8& digest);
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/**
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* Test if a certificate digest is already known, i.e. either
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* its certificate is stored or at least the digest has been announced.
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* \param digest certificate digest
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* \return true if digest is known
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*/
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bool is_known(const HashedId8& digest) const;
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private:
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using CertificateMap = std::unordered_map<HashedId8, Certificate>;
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using ShortDigestMap = std::unordered_map<HashedId3, CertificateMap::iterator>;
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// TODO add bounded capacity and automatic removal of expired certificates
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CertificateMap m_storage;
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ShortDigestMap m_short_digests;
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std::unordered_set<HashedId8> m_digests;
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};
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} // namespace v3
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} // namespace security
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} // namespace vanetza
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