parse p12 to x509

    FILE *fp;

    PKCS12 *p12 = NULL;

    unsigned char buf[10000],*p;

    char pass[100];

    EVP_PKEY *pkey = NULL;

    X509 *cert = NULL;

    int  len,ret;

    STACK_OF(X509) *ca=NULL;

    BIO *bp;

    

    fp = fopen(".../client-cert.pem","rb");

    len = fread(buf,1,10000,fp);

    fclose(fp);

    

    bp = BIO_new(BIO_s_file());

    BIO_set_fp(bp,stdout,BIO_NOCLOSE);

    p = buf;

    d2i_PKCS12(&p12, &p, len);

    

    printf("input password: \n");

    scanf("%s",pass);

    

    ret = PKCS12_parse(p12, pass, &pkey, &cert, &ca);

    if (ret != 1) {

        printf("err\n");

        return;

    }