INCOMPATIBLE CHANGE to the SSH2 private key file format. There is

[u/mdw/putty] / puttygen.c

diff --git a/puttygen.c b/puttygen.c
index 4ac0fef..689a383 100644 (file)
--- a/puttygen.c
+++ b/puttygen.c
@@ -406,6 +406,26 @@ static int save_ssh1_pubkey(char *filename, struct RSAKey *key)
     return 1;
 }
 
+/*
+ * Warn about the obsolescent key file format.
+ */
+void old_keyfile_warning(void)
+{
+    static const char mbtitle[] = "PuTTY Key File Warning";
+    static const char message[] =
+       "You are loading an SSH 2 private key which has an\n"
+       "old version of the file format. This means your key\n"
+       "file is not fully tamperproof. Future versions of\n"
+       "PuTTY may stop supporting this private key format,\n"
+       "so we recommend you convert your key to the new\n"
+       "format.\n"
+       "\n"
+       "Once the key is loaded into PuTTYgen, you can perform\n"
+       "this conversion simply by saving it again.";
+
+    MessageBox(NULL, message, mbtitle, MB_OK);
+}
+
 static int save_ssh2_pubkey(char *filename, struct ssh2_userkey *key)
 {
     unsigned char *pub_blob;