AttestationResult AttestationClientImpl::GetTpmInfo()

in client-library/src/Attestation/AttestationClient/lib/AttestationClientImpl.cpp [574:633]
42 lines of code
4 McCabe index (conditional complexity)

AttestationResult AttestationClientImpl::GetTpmInfo(TpmInfo& tpm_info) {

    AttestationResult result(AttestationResult::ErrorCode::SUCCESS);

    try {

        Tpm tpm;
        Buffer aik_cert = tpm.GetAIKCert();

        Buffer aik_pub = tpm.GetAIKPub();

        attest::PcrList pcrs = GetAttestationPcrList();

        // Unpack the PCR quote to get the raw quote and arrange the quote
        // signature in a format expected by AAS.
        PcrQuote pcr_quote_marshaled = tpm.GetPCRQuote(pcrs, attestation_hash_alg);
        PcrQuote pcr_quote = tpm.UnpackPcrQuoteToRSA(pcr_quote_marshaled);

        // We get the pcr values from the SHA256 bank since we expect the TCG logs
        // to also have SHA256 hash entries.
        PcrSet pcr_values = tpm.GetPCRValues(pcrs, attestation_hash_alg);

        EphemeralKey enc_key = tpm.GetEphemeralKey(pcr_values);

        tpm_info.aik_cert_ = aik_cert;
        tpm_info.aik_pub_ = aik_pub;
        tpm_info.pcr_values_ = pcr_values;
        tpm_info.pcr_quote_ = pcr_quote;
        tpm_info.encryption_key_ = enc_key;
    }
    catch(const Tss2Exception& e) {
        result.code_ = AttestationResult::ErrorCode::ERROR_TPM_OPERATION_FAILURE;
        result.tpm_error_code_ = e.get_rc();
        result.description_ = std::string(e.what());

        CLIENT_LOG_ERROR("Failed Tpm operation:%d Error:%s",
                          result.tpm_error_code_,
                          result.description_.c_str());
        return result;
    }
    catch(const std::exception& e) {
        // Since tss2 errors are throw runtime error exception. Catch it here.
        result.code_ = AttestationResult::ErrorCode::ERROR_TPM_INTERNAL_FAILURE;
        result.description_ = std::string(e.what());

        CLIENT_LOG_ERROR("Tpm internal error:%s",
                          result.description_.c_str());
        return result;
    }
    catch(...) {
        // Unknown exception.
        result.code_ = AttestationResult::ErrorCode::ERROR_TPM_INTERNAL_FAILURE;
        result.description_ = std::string("Unknown error");

        CLIENT_LOG_ERROR("Tpm internal error:%s",
                          result.description_.c_str());
        return result;
    }
    return result;
}