void compute_session_keys(uint8_t encryptkey[AES128_KEY_LEN],
        uint8_t IV[AES128_KEY_LEN],
        uint8_t integrity[AES128_KEY_LEN],
        uint8_t master_key[AES128_KEY_LEN],
        uint8_t encryption_salt[8]){

    uint8_t long_encryptkey[SHA256_DIGEST_LEN];
    uint8_t long_IV[SHA256_DIGEST_LEN];
    uint8_t long_integrity[SHA256_DIGEST_LEN];

    HMAC_SHA256_CTX ctx;

    HMAC_SHA256_Init(&ctx, master_key, sizeof(master_key));
    HMAC_SHA256_Update(&ctx,encryption_salt, 8);
    HMAC_SHA256_Update(&ctx, "encryption", 10);
    HMAC_SHA256_Final(long_encryptkey, &ctx);

    HMAC_SHA256_Init(&ctx, master_key, sizeof(master_key));
    HMAC_SHA256_Update(&ctx,encryption_salt, 8);
    HMAC_SHA256_Update(&ctx, "IV", 2);
    HMAC_SHA256_Final(long_IV, &ctx);

    HMAC_SHA256_Init(&ctx, master_key, sizeof(master_key));
    HMAC_SHA256_Update(&ctx,encryption_salt, 8);
    HMAC_SHA256_Update(&ctx, "integrity", 9);
    HMAC_SHA256_Final(long_integrity, &ctx);

    memcpy(encryptkey, long_encryptkey, AES128_KEY_LEN);
    memcpy(IV, long_IV, AES128_KEY_LEN);
    memcpy(integrity, long_integrity, AES128_KEY_LEN);
    ZERO(long_encryptkey);
    ZERO(long_IV);
    ZERO(long_integrity);
    ZERO(ctx);
}

void compute_session_keys_password (char *password, int iterations,
        uint8_t encryptkey[16],
        uint8_t IV[16],
        uint8_t integrity[16],
        uint8_t encryption_salt[8],
        uint8_t password_salt[8]
        ){

    uint8_t master_key[AES128_KEY_LEN];
    /* compute the password hash */
    PBKDF2_SHA256((uint8_t *)password, strlen(password), password_salt, 8, iterations,
            master_key, sizeof(master_key));
#ifdef CRYPTO_DEBUG
    print_key("masterkey", master_key, sizeof(master_key));
#endif
    compute_session_keys(encryptkey, IV, integrity, master_key, encryption_salt);
    ZERO(master_key);
}