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Add more cryptographic functions

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This commit is contained in:
Carles Fernandez 2023-06-07 10:19:13 +02:00
parent dafb322018
commit 37fe8eb523
No known key found for this signature in database
GPG Key ID: 4C583C52B0C3877D
2 changed files with 87 additions and 0 deletions
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85
src/core/libs/osnma_msg_receiver.cc
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@ -46,6 +46,7 @@ namespace wht = std;
#endif
#if USE_OPENSSL_FALLBACK
#include <openssl/hmac.h>
#if USE_OPENSSL_3
#include <openssl/evp.h>
#define OPENSSL_ENGINE NULL
@ -659,6 +660,90 @@ std::vector<uint8_t> osnma_msg_receiver::computeSHA3_256(const std::vector<uint8
}
std::vector<uint8_t> osnma_msg_receiver::computeHMAC_SHA_256(const std::vector<uint8_t>& key, const std::vector<uint8_t>& input)
{
std::vector<uint8_t> output(32);
#if USE_OPENSSL_FALLBACK
#if USE_OPENSSL_3
std::vector<uint8_t> hmac(SHA256_DIGEST_LENGTH); // HMAC-SHA256 output size
// Create HMAC context
EVP_MD_CTX* ctx = EVP_MD_CTX_new();
HMAC_CTX_reset(ctx);
// Initialize HMAC context with the key and HMAC algorithm
HMAC_Init_ex(ctx, key.data(), key.size(), EVP_sha256(), nullptr);
// Update HMAC context with the message
HMAC_Update(ctx, input.data(), input.size());
// Finalize HMAC computation and obtain the result
unsigned int hmacLen;
HMAC_Final(ctx, hmac.data(), &hmacLen);
// Clean up HMAC context
EVP_MD_CTX_free(ctx);
// Resize the HMAC vector to the actual length
hmac.resize(hmacLen);
output = hmac;
#else
std::vector<uint8_t> hmac(SHA256_DIGEST_LENGTH);
// Create HMAC context
HMAC_CTX* ctx = HMAC_CTX_new();
HMAC_Init_ex(ctx, key.data(), key.size(), EVP_sha256(), nullptr);
// Update HMAC context with the message
HMAC_Update(ctx, input.data(), input.size());
// Finalize HMAC computation
unsigned int hmacLen;
HMAC_Final(ctx, hmac.data(), &hmacLen);
// Clean up HMAC context
HMAC_CTX_free(ctx);
// Resize the HMAC vector to the actual length
hmac.resize(hmacLen);
output = hmac;
#endif
#else
std::vector<uint8_t> output_aux(32);
gnutls_hmac_hd_t hmac;
gnutls_hmac_init(&hmac, GNUTLS_MAC_SHA256, key.data(), key.size());
gnutls_hmac(hmac, input.data(), input.size());
gnutls_hmac_output(hmac, output_aux.data());
output = output_aux;
gnutls_hmac_deinit(hmac, output_aux.data());
#endif
return output;
}
std::vector<uint8_t> osnma_msg_receiver::computeCMAC_AES(const std::vector<uint8_t>& key, const std::vector<uint8_t>& input)
{
std::vector<uint8_t> output(16);
#if USE_OPENSSL_FALLBACK
#if USE_OPENSSL_3
#else
#endif
#else
gnutls_cipher_hd_t cipher;
std::vector<uint8_t> mac(16);
std::vector<uint8_t> message = input;
gnutls_datum_t key_data = {const_cast<uint8_t*>(key.data()), static_cast<unsigned int>(key.size())};
gnutls_cipher_init(&cipher, GNUTLS_CIPHER_AES_128_CBC, &key_data, nullptr);
gnutls_cipher_set_iv(cipher, nullptr, 16); // Set IV to zero
gnutls_cipher_encrypt(cipher, message.data(), message.size()); // Encrypt the message with AES-128
gnutls_cipher_tag(cipher, mac.data(), mac.size()); // Get the CMAC-AES tag
output = mac;
gnutls_cipher_deinit(cipher);
#endif
return output;
}
// bool signature(const std::vector<uint8_t>& publicKey, const std::vector<uint8_t>& digest, std::vector<uint8_t>& signature)
// {
// bool success = false;

2
src/core/libs/osnma_msg_receiver.h
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@ -71,6 +71,8 @@ private:
std::vector<uint8_t> computeSHA256(const std::vector<uint8_t>& input);
std::vector<uint8_t> computeSHA3_256(const std::vector<uint8_t>& input);
std::vector<uint8_t> computeHMAC_SHA_256(const std::vector<uint8_t>& key, const std::vector<uint8_t>& input);
std::vector<uint8_t> computeCMAC_AES(const std::vector<uint8_t>& key, const std::vector<uint8_t>& input);
std::unique_ptr<OSNMA_DSM_Reader> d_dsm_reader;