uint8_t key[32] = {
        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
        0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
        0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F
    };
    uint8_t iv[12] = {
        0xCA, 0xFE, 0xBA, 0xBE, 0xFA, 0xCE, 0xDB, 0xAD,
        0xDE, 0xCA, 0xF8, 0x88
    };
    const char *aad_str = "Metadata: Header info";
    const char *pt_str = "Secret Message: The eagle has landed.";
    
    uint8_t *aad = (uint8_t*)aad_str;     uint8_t *pt = (uint8_t*)pt_str;
    size_t aad_len = strlen(aad_str);     size_t pt_len = strlen(pt_str);

    // 3. Prepare Output Buffers
    uint8_t ct[pt_len];
    uint8_t tag[16]; // 128-bit tag
    uint8_t decrypted[pt_len + 1];

    // 4. Initialize AES Context
    aes_context_t ctx;
    aes_key_setup(&ctx, key, sizeof(key));
    aes_gcm_encrypt(&ctx, iv, sizeof(iv), aad, aad_len, pt, pt_len, ct, tag, sizeof(tag));
    int res = aes_gcm_decrypt(&ctx, iv, sizeof(iv), aad, aad_len, ct, pt_len, tag, sizeof(tag), decrypted);

    

	int main() {
	    printf("\n--- SHAKE256 Example ---\n");
	    const char *shake_input = "Seychelles and Bonaire have beautiful beaches.";
	    uint8_t shake_output[64]; // 512 bits output
	    
	    shake256(shake_output, sizeof(shake_output), shake_input, strlen(shake_input));
	    printf("Input: %s\n", shake_input);
	    print_hex("SHAKE256 Output (64 bytes)", shake_output, sizeof(shake_output));
	    return 0;
	}
    

    uint8_t private_key[48];
    uint8_t public_key[96];
    uint8_t signature[96];
    uint8_t msg_hash[48];
    p384_generate_random(msg_hash, sizeof(msg_hash));
    p384_gen_keypair(private_key, public_key)
    p384_ecdsa_sign(signature, private_key, msg_hash, sizeof(msg_hash)
    p384_ecdsa_verify(signature, public_key, msg_hash, sizeof(msg_hash)
    

	int main()
	{
	    const char *password = "password";
	    const uint8_t salt[] = { 0x12, 0x34, 0x56, 0x78 };
	    uint32_t iterations = 4096;
	    uint8_t dk[64];
	
	    printf("--- PBKDF2-HMAC-SHA512 Example ---\n");
	    pbkdf2_hmac_sha512((const uint8_t*)password, strlen(password),
	                       salt, sizeof(salt),
	                       iterations, dk, sizeof(dk));
	
	    printf("Password: %s\n", password);
	    print_hex("Salt", salt, sizeof(salt));
	    printf("Iterations: %d\n", iterations);
	    print_hex("Derived Key", dk, sizeof(dk));
	    return 0;
	}