59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
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#include <vanetza/security/hmac.hpp>
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#include <algorithm>
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#include <array>
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#if defined VANETZA_WITH_OPENSSL
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#include <openssl/hmac.h>
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#endif
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#if defined VANETZA_WITH_CRYPTOPP
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#include <cryptopp/hmac.h>
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#include <cryptopp/sha.h>
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#endif
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namespace vanetza
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{
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namespace security
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{
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#if defined VANETZA_WITH_OPENSSL
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KeyTag create_hmac_tag_openssl(const ByteBuffer& data, const HmacKey& hmacKey)
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{
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KeyTag keyTag;
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std::array<std::uint8_t, EVP_MAX_MD_SIZE> tag;
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unsigned int len = 0;
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HMAC(EVP_sha256(), hmacKey.data(), static_cast<int>(hmacKey.size()),
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data.data(), data.size(), tag.data(), &len);
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std::copy_n(tag.data(), keyTag.size(), keyTag.data());
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return keyTag;
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}
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#endif
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#if defined VANETZA_WITH_CRYPTOPP
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KeyTag create_hmac_tag_cryptopp(const ByteBuffer& data, const HmacKey& hmacKey)
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{
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KeyTag keyTag;
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std::array<std::uint8_t, 32> tag;
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CryptoPP::HMAC<CryptoPP::SHA256> mac(hmacKey.data(), hmacKey.size());
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mac.Update(data.data(), data.size());
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mac.Final(tag.data());
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std::copy_n(tag.data(), keyTag.size(), keyTag.data());
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return keyTag;
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}
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#endif
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KeyTag create_hmac_tag(const ByteBuffer& data, const HmacKey& hmacKey)
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{
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#if defined VANETZA_WITH_OPENSSL
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return create_hmac_tag_openssl(data, hmacKey);
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#elif defined VANETZA_WITH_CRYPTOPP
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return create_hmac_tag_cryptopp(data, hmacKey);
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#else
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# warning "no HMAC implementation available"
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return KeyTag {};
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#endif
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}
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} // namespace security
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} // namespace vanetza
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