Add internal function evp_generic_do_all()

This function is used to traverse all algorithm implementations for a
given operation type, and execute the given function for each of them.

For each algorithm implementation, a method is created and passed to
the given function, and then freed after that function's return.  If
the caller wishes to keep the method for longer, they must call the
appropriate up_ref function on the method, and they must also make
sure to free the passed methods at some point.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9356)

diff --git a/crypto/evp/evp_fetch.c b/crypto/evp/evp_fetch.c
index 82f6e5d970b5fdf277ab1d5604f6ab081ad0f0e9..5c100dd1eb837cbbf61fc0b3fe9bf3d13c5b7b41 100644 (file)
--- a/crypto/evp/evp_fetch.c
+++ b/crypto/evp/evp_fetch.c
@@ -236,3 +236,41 @@ int EVP_set_default_properties(OPENSSL_CTX *libctx, const char *propq)
     EVPerr(EVP_F_EVP_SET_DEFAULT_PROPERTIES, ERR_R_INTERNAL_ERROR);
     return 0;
 }
+
+struct do_all_data_st {
+    void (*user_fn)(void *method, void *arg);
+    void *user_arg;
+    void *(*new_method)(const char *name, const OSSL_DISPATCH *fns,
+                        OSSL_PROVIDER *prov);
+    void (*free_method)(void *);
+};
+
+static void do_one(OSSL_PROVIDER *provider, const OSSL_ALGORITHM *algo,
+                   int no_store, void *vdata)
+{
+    struct do_all_data_st *data = vdata;
+    void *method = data->new_method(algo->algorithm_name,
+                                    algo->implementation, provider);
+
+    if (method != NULL) {
+        data->user_fn(method, data->user_arg);
+        data->free_method(method);
+    }
+}
+
+void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
+                        void (*user_fn)(void *method, void *arg),
+                        void *user_arg,
+                        void *(*new_method)(const char *name,
+                                            const OSSL_DISPATCH *fns,
+                                            OSSL_PROVIDER *prov),
+                        void (*free_method)(void *))
+{
+    struct do_all_data_st data;
+
+    data.new_method = new_method;
+    data.free_method = free_method;
+    data.user_fn = user_fn;
+    data.user_arg = user_arg;
+    ossl_algorithm_do_all(libctx, operation_id, NULL, do_one, &data);
+}

diff --git a/crypto/evp/evp_locl.h b/crypto/evp/evp_locl.h
index d557e9c633b25e687ec2638c9824b567198da79f..ce461631402768a4162662a0e1773577a6d85354 100644 (file)
--- a/crypto/evp/evp_locl.h
+++ b/crypto/evp/evp_locl.h
@@ -139,6 +139,13 @@ void *evp_generic_fetch(OPENSSL_CTX *ctx, int operation_id,
                                             OSSL_PROVIDER *prov),
                         int (*up_ref_method)(void *),
                         void (*free_method)(void *));
+void evp_generic_do_all(OPENSSL_CTX *libctx, int operation_id,
+                        void (*user_fn)(void *method, void *arg),
+                        void *user_arg,
+                        void *(*new_method)(const char *name,
+                                            const OSSL_DISPATCH *fns,
+                                            OSSL_PROVIDER *prov),
+                        void (*free_method)(void *));
 
 /* Helper functions to avoid duplicating code */