To use Signiture verification, I make these code.

Error happened while using wc_RsaPublicKeyDecode

that function is seem to get rsakey info from string.

    ret = wc_Sha256Hash((const byte*)token, strlen(token), ucSha256Hashed);
    if(ret != 0)
    {
        printf("Error wc_Sha256Hash ret = %d", ret);
        return -25;
    }

    RsaKey rsaKey;
    word32 idx = 0;

    XMEMSET(&rsaKey, 0, sizeof(rsaKey));

    word32 pksize = (word32)wolfSSL_X509_get_pubkey( parse_jason->x509Cert[0] )->pkey_sz;
    const byte * pubkey = (const unsigned char*) wolfSSL_X509_get_pubkey( parse_jason->x509Cert[0] )->pkey.ptr;

    if(pubkey == NULL)
        printf("pubkey is NULL");
    else
        printf("pubkey is not NULL");

    PLOG("%s, pksize %d", __func__, pksize);

    ret = wc_InitRsaKey(&rsaKey, NULL);
    if(ret != 0)
    {
        printf("Error wc_InitRsaKey ret = %d", ret);
        return -25;
    }

    ret = wc_RsaPublicKeyDecode(pubkey, &idx, &rsaKey, pksize);   <-- Error Msg Occurred
    PLOG("wc_RsaPublicKeyDecode ret = %d", ret);
    if (ret != 0)
    {
        // error parsing public key 
        memset( err_string, 0x00, sizeof(err_string) );       

        printf("%s failed ! wc_RsaPublicKeyDecode error %d", __func__, ret);
        return -28;
    } else {
        printf("%s success ! wc_RsaPublicKeyDecode success", __func__);
    }

    ret = wc_SignatureVerify(WC_HASH_TYPE_SHA256, WC_SIGNATURE_TYPE_RSA_W_ENC,
                            (const byte*)ucSha256Hashed, sizeof(ucSha256Hashed),
                            (const byte*)ucSignatureBase64decoded, nLengthSigDecoded,
                            &rsaKey, 300);

    free(token);

    free (ucSignatureBase64decoded);

    wc_FreeRsaKey( &rsaKey );

Error Message is ......

wc_Sha256Hash ret = 0
pubkey is not NULL
check_signature_verification, pksize 270
wc_InitRsaKey ret = 0

then

Process 1110071 (-) terminated SIGSEGV code=1 fltno=11 ip=0000000011b538d8(/usr/lib/libwolfssl.so.12@wc_DhSetKey+0x0000000000000edc) mapaddr=000000000001c8d8. ref=10bc352000000000

could you answer why this error happened?

wait your answer....

thanks..