// returns NULL if CSR doesn't contain the extension, the commitment C value otherwise
BIGNUM *getCommitmentValueFromCSR(char *req_filename) {
/* read in the request */
X509_REQ *req;
FILE *fp;
if (!(fp = fopen(req_filename, "r")))
critical_error("Error reading request file");
if (!(req = PEM_read_X509_REQ(fp, NULL, NULL, NULL)))
critical_error("Error reading request in file");
fclose(fp);
BIGNUM *toret = NULL;
// enable the extension handling (retrieve/print as string)
int nid = _commitmentExt_start();
// get extensions stack of request
STACK_OF(X509_EXTENSION) *extlist = X509_REQ_get_extensions(req);
if (extlist!=NULL) { // if there are extensions
int extpos = X509v3_get_ext_by_NID(extlist, nid, -1); // try to locate extension
if (extpos!=-1) { // if found
X509_EXTENSION *ext = X509v3_get_ext(extlist, extpos);
toret = _commitmentExt2BN(ext);
}
}
X509_REQ_free(req);
_commitmentExt_end();
return toret;
}
X509_EXTENSION *
OCSP_SINGLERESP_get_ext(OCSP_SINGLERESP *x, int loc)
{
return X509v3_get_ext(x->singleExtensions, loc);
}
X509_EXTENSION *
OCSP_BASICRESP_get_ext(OCSP_BASICRESP *x, int loc)
{
return X509v3_get_ext(x->tbsResponseData->responseExtensions, loc);
}
X509_EXTENSION *
OCSP_ONEREQ_get_ext(OCSP_ONEREQ *x, int loc)
{
return X509v3_get_ext(x->singleRequestExtensions, loc);
}
X509_EXTENSION *
OCSP_REQUEST_get_ext(OCSP_REQUEST *x, int loc)
{
return X509v3_get_ext(x->tbsRequest->requestExtensions, loc);
}
X509_EXTENSION *
TS_REQ_get_ext(TS_REQ *a, int loc)
{
return X509v3_get_ext(a->extensions, loc);
}
X509_EXTENSION *X509_get_ext(const X509 *x, int loc)
{
return (X509v3_get_ext(x->cert_info.extensions, loc));
}
X509_EXTENSION *X509_CRL_get_ext(const X509_CRL *x, int loc)
{
return (X509v3_get_ext(x->crl.extensions, loc));
}
X509_EXTENSION *X509_REVOKED_get_ext(const X509_REVOKED *x, int loc)
{
return (X509v3_get_ext(x->extensions, loc));
}
X509_EXTENSION *
TS_TST_INFO_get_ext(TS_TST_INFO *a, int loc)
{
return X509v3_get_ext(a->extensions, loc);
}
EXPORT_C X509_EXTENSION *X509_CRL_get_ext(X509_CRL *x, int loc)
{
return(X509v3_get_ext(x->crl->extensions,loc));
}
EXPORT_C X509_EXTENSION *X509_get_ext(X509 *x, int loc)
{
return(X509v3_get_ext(x->cert_info->extensions,loc));
}
