TM4C129ENCPDT: WiFi bad certificate error

Hi All,

I am using cc3100 with sdk 1.2 and ti rtos and tm4c129encpdt microcontroller. I am trying to use ftps. For that, I first tried ftp with the simplelink socket api and it worked good. Now I am using FTPS and used the TLS from the simplelink api itself. The way I followed is-

1. I have the root CA certificate in .pem format and wrote it into the serial flash of the cc3100 using the file systems api -

#define SL_SSL_CA_CERT_FILE_NAME "/cert/testcacert.der"
int32_t writeCert(uint8_t *data , uint32_t len) {
    int32_t fHdl, file;
          char filename[] = SL_SSL_CA_CERT_FILE_NAME;
    int32_t status;
    uint32_t offset, token;
    uint32_t writeLen;

    fHdl = sl_FsOpen(filename,
                     FS_MODE_OPEN_CREATE(len,
                                         _FS_FILE_OPEN_FLAG_SECURE|_FS_FILE_OPEN_FLAG_COMMIT|_FS_FILE_PUBLIC_WRITE
                                         |_FS_FILE_PUBLIC_READ),
                     &token, &file);
    if( fHdl >= 0 ) {
        offset = 0;
        do {
            if (len < CERT_WRITE_CHUNK_SIZE) {
                writeLen = len;
            } else {
                writeLen = CERT_WRITE_CHUNK_SIZE;
            }
            status = sl_FsWrite(file, offset, &(data[offset]), writeLen);
            offset += writeLen;
        }
        while (offset < len);

        sl_FsClose(file,0,0,0);
        return 0;
    } else {
        return -1;
}
}


This writes successfully as it return 0.

2. Now I use the slsocketopt - 

SlSockSecureMethod method;
    unsigned long cipher =  SL_SEC_MASK_SECURE_DEFAULT ;
     method.secureMethod = SL_SO_SEC_METHOD_TLSV1_2;  // security method we want to use

     //int sock = sl_Socket(SL_AF_INET,SL_SOCK_STREAM, IPPROTO_IP);

     int sock = sl_Socket(SL_AF_INET,SL_SOCK_STREAM, SL_SEC_SOCKET);
     if (sock == -1) {
          logg("ftp: ***ERROR*** - socket not created.","");
          sock = 0;goto sockCleanup;
      } else {
          if (ftp_debug) logStr("ftp: socket %s created successfully.","",ipAddress);
      }

    int ret = sl_SetSockOpt(sock, SL_SOL_SOCKET, SL_SO_SECMETHOD, (_u8 *)&method, sizeof(method));

    ret = sl_SetSockOpt(sock, SL_SOL_SOCKET, SL_SO_SECURE_MASK, &cipher, sizeof(cipher));

    ret= sl_SetSockOpt(sock, SL_SOL_SOCKET, SL_SO_SECURE_FILES_CA_FILE_NAME, selfCertFileName, (SlSocklen_t)strlen(selfCertFileName));

But when I try to call connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr));

It gives the -456 error which bad ca file.

I am using the self-signed root ca and generating the intermediate certificate to put into my local ftps server which is on Filezilla. 

Why am I getting this error? I tried so many things. Help me out this.

My root CA is in .pem format. I copied the contents into the array and used the fs api to write into cc3100 serial flash. If I convert this .pem to .der format, the file looks likes this(opened in notepad++)-

0‚ð0‚Y 	 ’X
«0
	*†H†÷
 010	UIN10U	Karnataka10U	Bengaluru10U
Gluon10UEmbedded10U
ftps.gluon1!0	*†H†÷
	akhilesh@gluon.com0
191223093042Z
241221093042Z010	UIN10U	Karnataka10U	Bengaluru10U
Gluon10UEmbedded10U
ftps.gluon1!0	*†H†÷
	akhilesh@gluon.com0Ÿ0
	*†H†÷
  0‰ Ä3ê×bX¶h¥’šÆ"RXTÚX3ŽÝSÎ%ÿ8™Å@Ãji?¬Þ4”‰%}2V‡ ¥n:Ñ#¤_	«yQx‘›‘p±/¤¶m!_þÍ[
‘hôúÌ0HQØÓéWêrü‚ˆéL²Å’-,õ ȏ™~çÑgîbþ,P½±.Å –1v_ £P0N0U*f·éª
ÔË…àQ­•ßoþj­0U#0€*f·éª
ÔË…àQ­•ßoþj­0U0ÿ0
	*†H†÷
  ‹Ùm9(, á\âr$L¤º×—¡6¤’l*½ÌÉ=ÉdÏ4æÞÀélá3Xð„$·®oÙÒØÈXðp<šŠˆ)¾Ã„öµšÛ̲:‚ç
£JÒíCzLO}k+]`C9ê«àÈ ¤»}3ÒA䩃¯$Øb§cv‘2€ñ

How to write .der format into serial flash using filesystem API?

Thanks

Akhilesh