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Add work on crypto functions

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This commit is contained in:
Carles Fernandez 2023-06-07 11:15:15 +02:00
parent 37fe8eb523
commit 3902b6154d
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GPG Key ID: 4C583C52B0C3877D
1 changed files with 51 additions and 15 deletions
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66
src/core/libs/osnma_msg_receiver.cc
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@ -51,6 +51,7 @@ namespace wht = std;
#include <openssl/evp.h> #include <openssl/evp.h>
#define OPENSSL_ENGINE NULL #define OPENSSL_ENGINE NULL
#else #else
#include <openssl/cmac.h>
#include <openssl/sha.h> #include <openssl/sha.h>
#endif #endif
#else #else
@ -665,30 +666,27 @@ std::vector<uint8_t> osnma_msg_receiver::computeHMAC_SHA_256(const std::vector<u
std::vector<uint8_t> output(32); std::vector<uint8_t> output(32);
#if USE_OPENSSL_FALLBACK #if USE_OPENSSL_FALLBACK
#if USE_OPENSSL_3 #if USE_OPENSSL_3
std::vector<uint8_t> hmac(SHA256_DIGEST_LENGTH); // HMAC-SHA256 output size std::vector<uint8_t> hmac(EVP_MAX_MD_SIZE);
// Create HMAC context // Create HMAC-SHA256 context
EVP_MD_CTX* ctx = EVP_MD_CTX_new(); EVP_MD_CTX* ctx = EVP_MD_CTX_new();
HMAC_CTX_reset(ctx); EVP_PKEY* pkey = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, nullptr, key.data(), key.size());
// Initialize HMAC context with the key and HMAC algorithm // Initialize HMAC-SHA256 context
HMAC_Init_ex(ctx, key.data(), key.size(), EVP_sha256(), nullptr); EVP_DigestSignInit(ctx, nullptr, EVP_sha256(), nullptr, pkey);
// Update HMAC context with the message // Compute HMAC-SHA256
HMAC_Update(ctx, input.data(), input.size()); EVP_DigestSignUpdate(ctx, input.data(), input.size());
size_t macLength;
EVP_DigestSignFinal(ctx, hmac.data(), &macLength);
// Finalize HMAC computation and obtain the result EVP_PKEY_free(pkey);
unsigned int hmacLen;
HMAC_Final(ctx, hmac.data(), &hmacLen);
// Clean up HMAC context
EVP_MD_CTX_free(ctx); EVP_MD_CTX_free(ctx);
// Resize the HMAC vector to the actual length mac.resize(macLength);
hmac.resize(hmacLen);
output = hmac; output = hmac;
#else #else
std::vector<uint8_t> hmac(SHA256_DIGEST_LENGTH); std::vector<uint8_t> hmac(32);
// Create HMAC context // Create HMAC context
HMAC_CTX* ctx = HMAC_CTX_new(); HMAC_CTX* ctx = HMAC_CTX_new();
HMAC_Init_ex(ctx, key.data(), key.size(), EVP_sha256(), nullptr); HMAC_Init_ex(ctx, key.data(), key.size(), EVP_sha256(), nullptr);
@ -727,7 +725,45 @@ std::vector<uint8_t> osnma_msg_receiver::computeCMAC_AES(const std::vector<uint8
std::vector<uint8_t> output(16); std::vector<uint8_t> output(16);
#if USE_OPENSSL_FALLBACK #if USE_OPENSSL_FALLBACK
#if USE_OPENSSL_3 #if USE_OPENSSL_3
std::vector<uint8_t> mac(EVP_MAX_MD_SIZE); // CMAC-AES output size
EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new();
// Initialize CMAC-AES context
EVP_CIPHER_CTX* cmacCtx = EVP_CIPHER_CTX_new();
EVP_CMAC_CTX* cmac = EVP_CMAC_CTX_new();
EVP_CIPHER_CTX_reset(ctx);
EVP_CMAC_CTX_reset(cmac);
// Set AES-128 CMAC cipher and key
EVP_CMAC_init(cmac, key.data(), key.size(), EVP_aes_128_cbc(), nullptr);
// Compute CMAC-AES
EVP_CMAC_update(cmac, input.data(), input.size());
size_t macLength;
EVP_CMAC_final(cmac, mac.data(), &macLength);
EVP_CIPHER_CTX_free(ctx);
EVP_CMAC_CTX_free(cmac);
mac.resize(macLength);
output = mac;
#else #else
std::vector<uint8_t> mac(CMAC_DIGEST_LENGTH); // CMAC-AES output size
// Create CMAC context
CMAC_CTX* cmacCtx = CMAC_CTX_new();
CMAC_Init(cmacCtx, key.data(), key.size(), EVP_aes_128_cbc(), nullptr);
// Compute CMAC-AES
CMAC_Update(cmacCtx, input.data(), input.size());
CMAC_Final(cmacCtx, mac.data(), nullptr);
// Clean up CMAC context
CMAC_CTX_free(cmacCtx);
output = mac;
#endif #endif
#else #else
gnutls_cipher_hd_t cipher; gnutls_cipher_hd_t cipher;