49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
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#include <vanetza/security/backend.hpp>
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#include <vanetza/security/v3/certificate.hpp>
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#include <vanetza/security/v3/hash.hpp>
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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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ByteBuffer calculate_message_hash(Backend& backend, HashAlgorithm hash_algo, const ByteBuffer& payload, const CertificateView& signing_cert)
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{
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ByteBuffer encoded_cert;
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if (signing_cert.is_canonical()) {
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encoded_cert = signing_cert.encode();
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} else {
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auto canonical_signing_cert = signing_cert.canonicalize();
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if (canonical_signing_cert) {
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encoded_cert = canonical_signing_cert->encode();
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}
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}
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ByteBuffer data_hash = backend.calculate_hash(hash_algo, payload);
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ByteBuffer cert_hash = backend.calculate_hash(hash_algo, encoded_cert);
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ByteBuffer concat_hash;
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concat_hash.reserve(data_hash.size() + cert_hash.size());
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concat_hash.insert(concat_hash.end(), data_hash.begin(), data_hash.end());
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concat_hash.insert(concat_hash.end(), cert_hash.begin(), cert_hash.end());
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return backend.calculate_hash(hash_algo, concat_hash);
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}
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HashAlgorithm specified_hash_algorithm(KeyType key_type)
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{
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switch (key_type) {
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case KeyType::NistP256:
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case KeyType::BrainpoolP256r1:
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return HashAlgorithm::SHA256;
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case KeyType::BrainpoolP384r1:
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return HashAlgorithm::SHA384;
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default:
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return HashAlgorithm::Unspecified;
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}
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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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