//Key generation
    RsaKey   RSAKey;
    long     exp = 65537l;
    WC_RNG   rng;
    int      keySize = 1024;
    uint8_t  *derKey = NULL;
    uint16_t derSz = 0;

    if( wc_InitRsaKey(&RSAKey, NULL) != 0 ) { // not using heap hint. No custom memory
        // error initializing rng
        printf("wc_InitRng Failed");
        goto end;
    }

    //initialize random number generator
    if( wc_InitRng(&rng) != 0 ) {
        // error initializing rng
        printf("wc_InitRng Failed");
        goto end;
    }

    if(wc_RsaSetRNG(&RSAKey, &rng) != EXIT_SUCCESS) {
        printf("wc_RsaSetRNG Failed\r\n");
        goto end; 
    }

    // generate keysize bit long private key
    if( wc_MakeRsaKey(&RSAKey, keySize, exp, &rng) != 0 ) {
        // error generating private key
        printf("wc_MakeRsaKey Failed\r\n");
        goto end; 
    }

    //free RNG object
    if (wc_FreeRng(&rng) != 0) {
      printf("wc_FreeRng Failed \r\n");
    }

    //Check RSA key
    int ret = wc_CheckRsaKey(&RSAKey);
    if (ret != 0) {
        printf("Key Error\r\n");
    }

    // Allocate memory for der
    derKey = pvPortMalloc(keySize);
    if (derKey == NULL) {
        NRF_LOG_ERROR("Could not allocate memory to create derKey");
        goto end;
    }

    derSz = 0;

    //Convert key to der
    derSz = wc_RsaKeyToDer(&RSAKey, derKey, keySize);
    printf("Der size = %d \r\n",derSz);
    if (derSz == 0) {
        printf("der Error\r\n");
    }

    RsaKey privateKey;
    word32 idx = 0;

    //decode new private key from DER
    ret = wc_RsaPrivateKeyDecode(derKey, &idx, &privateKey, derSz);
    if( ret != 0 ) {
        printf("Cannot decode private key. ret = %d \r\n",ret);
        printf("Failed here \r\n");
    }