1 files changed, 50 insertions, 1 deletions

diff --git a/cmake/Modules/findopensslfeatures.c b/cmake/Modules/findopensslfeatures.c
index 390f1d2..ed7eb8e 100644
--- a/cmake/Modules/findopensslfeatures.c
+++ b/cmake/Modules/findopensslfeatures.c
@@ -4,6 +4,9 @@
 #include <openssl/ec.h>
 #include <openssl/objects.h>
 #include <openssl/evp.h>
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+#include <openssl/provider.h>
+#endif
 
 int
 list_curves()
@@ -65,15 +68,57 @@ list_ciphers()
     return 0;
 }
 
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+static void
+print_km_name(const char *name, void *param)
+{
+    /* Do not print OIDs for better clarity */
+    if (!name || ((name[0] <= '9') && (name[0] >= '0'))) {
+        return;
+    }
+    printf("%s\n", name);
+}
+
+static void
+print_km(EVP_KEYMGMT *km, void *param)
+{
+    EVP_KEYMGMT_names_do_all(km, print_km_name, NULL);
+}
+#endif
+
 int
 list_publickey()
 {
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
     for (size_t i = 0; i < EVP_PKEY_meth_get_count(); i++) {
         const EVP_PKEY_METHOD *pmeth = EVP_PKEY_meth_get0(i);
         int                    id = 0;
         EVP_PKEY_meth_get0_info(&id, NULL, pmeth);
         printf("%s\n", OBJ_nid2ln(id));
     }
+#else
+    EVP_KEYMGMT_do_all_provided(NULL, print_km, NULL);
+#endif
+    return 0;
+}
+
+int
+list_providers()
+{
+    printf("default\n");
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+    const char *known_names[] = {"legacy", "fips"};
+    for (size_t i = 0; i < sizeof(known_names) / sizeof(known_names[0]); i++) {
+        OSSL_PROVIDER *prov = OSSL_PROVIDER_load(NULL, known_names[i]);
+        if (prov) {
+            printf("%s\n", known_names[i]);
+            OSSL_PROVIDER_unload(prov);
+        }
+    }
+#else
+    /* OpenSSL < 3.0 includes all legacy algorithms in the default provider */
+    printf("legacy\n");
+#endif
     return 0;
 }
 
@@ -81,7 +126,8 @@ int
 main(int argc, char *argv[])
 {
     if (argc != 2) {
-        fprintf(stderr, "Usage: opensslfeatures [curves|hashes|ciphers|publickey]\n");
+        fprintf(stderr,
+                "Usage: opensslfeatures [curves|hashes|ciphers|publickey|providers]\n");
         return 1;
     }
     if (!strcmp(argv[1], "hashes")) {
@@ -96,6 +142,9 @@ main(int argc, char *argv[])
     if (!strcmp(argv[1], "publickey")) {
         return list_publickey();
     }
+    if (!strcmp(argv[1], "providers")) {
+        return list_providers();
+    }
     fprintf(stderr, "Unknown command: %s\n", argv[1]);
     return 1;
 }