Add test to demonstrate the app's new engine key loading

This adds a bit of functionality in ossltest, so it can now be used to
load PEM files.  It takes the file name as key ID, but just to make
sure faults aren't ignored, it requires all file names to be prefixed
with 'ot:'.

Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/13570)

1 files changed, 44 insertions, 0 deletions

diff --git a/engines/e_ossltest.c b/engines/e_ossltest.c
index df2a3e14e8..15a7d75f1e 100644
--- a/engines/e_ossltest.c
+++ b/engines/e_ossltest.c
@@ -37,9 +37,14 @@
 #include <openssl/aes.h>
 #include <openssl/rand.h>
 #include <openssl/crypto.h>
+#include <openssl/pem.h>
 
 #include "e_ossltest_err.c"
 
+#ifdef _WIN32
+# define strncasecmp _strnicmp
+#endif
+
 /* Engine Id and Name */
 static const char *engine_ossltest_id = "ossltest";
 static const char *engine_ossltest_name = "OpenSSL Test engine support";
@@ -317,6 +322,43 @@ static void destroy_ciphers(void)
     _hidden_aes_128_cbc = NULL;
 }
 
+/* Key loading */
+static EVP_PKEY *load_key(ENGINE *eng, const char *key_id, int pub,
+                          UI_METHOD *ui_method, void *ui_data)
+{
+    BIO *in;
+    EVP_PKEY *key;
+
+    if (strncasecmp(key_id, "ot:", 3) != 0)
+        return NULL;
+    key_id += 3;
+
+    fprintf(stderr, "[ossltest]Loading %s key %s\n",
+            pub ? "Public" : "Private", key_id);
+    in = BIO_new_file(key_id, "r");
+    if (!in)
+        return NULL;
+    if (pub)
+        key = PEM_read_bio_PUBKEY(in, NULL, 0, NULL);
+    else
+        key = PEM_read_bio_PrivateKey(in, NULL, 0, NULL);
+    BIO_free(in);
+    return key;
+}
+
+static EVP_PKEY *ossltest_load_privkey(ENGINE *eng, const char *key_id,
+                                       UI_METHOD *ui_method, void *ui_data)
+{
+    return load_key(eng, key_id, 0, ui_method, ui_data);
+}
+
+static EVP_PKEY *ossltest_load_pubkey(ENGINE *eng, const char *key_id,
+                                      UI_METHOD *ui_method, void *ui_data)
+{
+    return load_key(eng, key_id, 1, ui_method, ui_data);
+}
+
+
 static int bind_ossltest(ENGINE *e)
 {
     /* Ensure the ossltest error handling is set up */
@@ -328,6 +370,8 @@ static int bind_ossltest(ENGINE *e)
         || !ENGINE_set_ciphers(e, ossltest_ciphers)
         || !ENGINE_set_RAND(e, ossltest_rand_method())
         || !ENGINE_set_destroy_function(e, ossltest_destroy)
+        || !ENGINE_set_load_privkey_function(e, ossltest_load_privkey)
+        || !ENGINE_set_load_pubkey_function(e, ossltest_load_pubkey)
         || !ENGINE_set_init_function(e, ossltest_init)
         || !ENGINE_set_finish_function(e, ossltest_finish)) {
         OSSLTESTerr(OSSLTEST_F_BIND_OSSLTEST, OSSLTEST_R_INIT_FAILED);