Hello,
I currently have a short program that converts a certificate from pem format
to der format.
static int vpncm_convert_pem_to_der(struct cm_module *module, char
*pem_file_name, char *der_file_name )
{
int res,ret = 0;
FILE* f;
BIO *out = NULL;
X509 *loaded = NULL;
f = fopen( pem_file_name,"r");
if(f != NULL)
{
/*Read the cert into structure*/
loaded = PEM_read_X509(f, NULL, NULL, NULL);
if(loaded)
{
/*write from the internal X509 to pemfile*/
out = BIO_new(BIO_s_file());
if(out != NULL)
{
/*der_file_name is the file's name for der certificate*/
if(BIO_write_filename(out, der_file_name) > 0)
{
/*Convert the pem structure to der and save it in der
file.*/
res = i2d_X509_bio(out, loaded);
}
fclose(f);
BIO_free_all(out);
}
return ret;
}
I would like to do the same, i.e. convert from pem to der, for a private key
file. The key may have been generated either with ecdsa or rsa 2048/4096
algorithm.
May I use the program above and just replace a few openssl api's, or is it
more complicated?
Can someone share a piece of code that does the job?
Thanks
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