+
+int X509_SIG_INFO_get(const X509_SIG_INFO *siginf, int *mdnid, int *pknid,
+ int *secbits, uint32_t *flags)
+{
+ if (mdnid != NULL)
+ *mdnid = siginf->mdnid;
+ if (pknid != NULL)
+ *pknid = siginf->pknid;
+ if (secbits != NULL)
+ *secbits = siginf->secbits;
+ if (flags != NULL)
+ *flags = siginf->flags;
+ return (siginf->flags & X509_SIG_INFO_VALID) != 0;
+}
+
+void X509_SIG_INFO_set(X509_SIG_INFO *siginf, int mdnid, int pknid,
+ int secbits, uint32_t flags)
+{
+ siginf->mdnid = mdnid;
+ siginf->pknid = pknid;
+ siginf->secbits = secbits;
+ siginf->flags = flags;
+}
+
+int X509_get_signature_info(X509 *x, int *mdnid, int *pknid, int *secbits,
+ uint32_t *flags)
+{
+ X509_check_purpose(x, -1, -1);
+ return X509_SIG_INFO_get(&x->siginf, mdnid, pknid, secbits, flags);
+}
+
+static void x509_sig_info_init(X509_SIG_INFO *siginf, const X509_ALGOR *alg,
+ const ASN1_STRING *sig)
+{
+ int pknid, mdnid;
+ const EVP_MD *md;
+
+ siginf->mdnid = NID_undef;
+ siginf->pknid = NID_undef;
+ siginf->secbits = -1;
+ siginf->flags = 0;
+ if (!OBJ_find_sigid_algs(OBJ_obj2nid(alg->algorithm), &mdnid, &pknid)
+ || pknid == NID_undef)
+ return;
+ siginf->pknid = pknid;
+ if (mdnid == NID_undef) {
+ /* If we have one, use a custom handler for this algorithm */
+ const EVP_PKEY_ASN1_METHOD *ameth = EVP_PKEY_asn1_find(NULL, pknid);
+ if (ameth == NULL || ameth->siginf_set == NULL
+ || ameth->siginf_set(siginf, alg, sig) == 0)
+ return;
+ siginf->flags |= X509_SIG_INFO_VALID;
+ return;
+ }
+ siginf->flags |= X509_SIG_INFO_VALID;
+ siginf->mdnid = mdnid;
+ md = EVP_get_digestbynid(mdnid);
+ if (md == NULL)
+ return;
+ /* Security bits: half number of bits in digest */
+ siginf->secbits = EVP_MD_size(md) * 4;
+ switch (mdnid) {
+ case NID_sha1:
+ case NID_sha256:
+ case NID_sha384:
+ case NID_sha512:
+ siginf->flags |= X509_SIG_INFO_TLS;
+ }
+}
+
+void x509_init_sig_info(X509 *x)
+{
+ x509_sig_info_init(&x->siginf, &x->sig_alg, &x->signature);
+}