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Fix CMAC-AES algorithm for OpenSSL 1.x

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This commit is contained in:
Carles Fernandez 2024-07-01 02:44:22 +02:00
parent 95e3329f10
commit 2f475d6aaf
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GPG Key ID: 4C583C52B0C3877D
1 changed files with 31 additions and 6 deletions
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37
src/core/system_parameters/gnss_crypto.cc
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@ -504,20 +504,45 @@ std::vector<uint8_t> Gnss_Crypto::computeCMAC_AES(const std::vector<uint8_t>& ke
aux.resize(output_length);
output = aux;
#else // OpenSSL 1.x
std::vector<uint8_t> mac(16); // CMAC-AES output size
size_t mac_length = 0; // to hold the length of the MAC output
// Create CMAC context
CMAC_CTX* cmacCtx = CMAC_CTX_new();
CMAC_Init(cmacCtx, key.data(), key.size(), EVP_aes_128_cbc(), nullptr);
if (!cmacCtx)
{
LOG(INFO) << "OSNMA CMAC-AES: Failed to create CMAC context";
return output;
}
// Compute CMAC-AES
CMAC_Update(cmacCtx, input.data(), input.size());
CMAC_Final(cmacCtx, mac.data(), nullptr);
// Initialize the CMAC context with the key and cipher
if (1 != CMAC_Init(cmacCtx, key.data(), key.size(), EVP_aes_128_cbc(), nullptr))
{
LOG(INFO) << "OSNMA CMAC-AES: MAC_Init failed";
CMAC_CTX_free(cmacCtx);
return output;
}
// Compute the CMAC
if (1 != CMAC_Update(cmacCtx, input.data(), input.size()))
{
LOG(INFO) << "OSNMA CMAC-AES: CMAC_Update failed";
CMAC_CTX_free(cmacCtx);
return output;
}
// Finalize the CMAC computation and retrieve the output
if (1 != CMAC_Final(cmacCtx, output.data(), &mac_length))
{
LOG(INFO) << "OSNMA CMAC-AES:CMAC_Final failed";
CMAC_CTX_free(cmacCtx);
return output;
}
// Clean up CMAC context
CMAC_CTX_free(cmacCtx);
output = mac;
// Ensure the output vector is properly sized according to the actual MAC length
output.resize(mac_length);
#endif
#endif
return output;