gpg,gpgsm: Record the creation time of a private key.

* sm/call-agent.c (gpgsm_agent_genkey): Pass --timestamp option.
(gpgsm_agent_import_key): Ditto.
* g10/call-agent.c (agent_genkey): Add arg timestamp and pass it on.
(agent_import_key): Ditto.
* g10/import.c (transfer_secret_keys): Pass the creation date to the
agent.
* g10/keygen.c (common_gen): Ditto.
--

Having the creation time in the private key file makes it a lot easier
to re-create an OpenPGP public keyblock in case it was accidentally
lost.

Signed-off-by: Werner Koch <wk@gnupg.org>
Cherry-picked-from-master: 4031c42bfd

g10/call-agent.c

@@ -1946,11 +1946,12 @@ inq_genkey_parms (void *opaque, const char *line)
    gcry_pk_genkey.  If NO_PROTECTION is true the agent is advised not
    to protect the generated key.  If NO_PROTECTION is not set and
    PASSPHRASE is not NULL the agent is requested to protect the key
-   with that passphrase instead of asking for one.  */
+   with that passphrase instead of asking for one.  TIMESTAMP is the
+   creation time of the key or zero.  */
 gpg_error_t
 agent_genkey (ctrl_t ctrl, char **cache_nonce_addr, char **passwd_nonce_addr,
               const char *keyparms, int no_protection,
-              const char *passphrase, gcry_sexp_t *r_pubkey)
+              const char *passphrase, time_t timestamp, gcry_sexp_t *r_pubkey)
 {
   gpg_error_t err;
   struct genkey_parm_s gk_parm;
@@ -1959,6 +1960,7 @@ agent_genkey (ctrl_t ctrl, char **cache_nonce_addr, char **passwd_nonce_addr,
   membuf_t data;
   size_t len;
   unsigned char *buf;
+  char timestamparg[16 + 16];  /* The 2nd 16 is sizeof(gnupg_isotime_t) */
   char line[ASSUAN_LINELENGTH];
 
   memset (&dfltparm, 0, sizeof dfltparm);
@@ -1970,6 +1972,14 @@ agent_genkey (ctrl_t ctrl, char **cache_nonce_addr, char **passwd_nonce_addr,
     return err;
   dfltparm.ctx = agent_ctx;
 
+  if (timestamp)
+    {
+      strcpy (timestamparg, " --timestamp=");
+      epoch2isotime (timestamparg+13, timestamp);
+    }
+  else
+    *timestamparg = 0;
+
   if (passwd_nonce_addr && *passwd_nonce_addr)
     ; /* A RESET would flush the passwd nonce cache.  */
   else
@@ -1984,7 +1994,8 @@ agent_genkey (ctrl_t ctrl, char **cache_nonce_addr, char **passwd_nonce_addr,
   gk_parm.dflt     = &dfltparm;
   gk_parm.keyparms = keyparms;
   gk_parm.passphrase = passphrase;
-  snprintf (line, sizeof line, "GENKEY%s%s%s%s%s",
+  snprintf (line, sizeof line, "GENKEY%s%s%s%s%s%s",
+            *timestamparg? timestamparg : "",
             no_protection? " --no-protection" :
             passphrase   ? " --inq-passwd" :
             /*          */ "",
@@ -2388,11 +2399,12 @@ inq_import_key_parms (void *opaque, const char *line)
 gpg_error_t
 agent_import_key (ctrl_t ctrl, const char *desc, char **cache_nonce_addr,
                   const void *key, size_t keylen, int unattended, int force,
-		  u32 *keyid, u32 *mainkeyid, int pubkey_algo)
+		  u32 *keyid, u32 *mainkeyid, int pubkey_algo, u32 timestamp)
 {
   gpg_error_t err;
   struct import_key_parm_s parm;
   struct cache_nonce_parm_s cn_parm;
+  char timestamparg[16 + 16];  /* The 2nd 16 is sizeof(gnupg_isotime_t) */
   char line[ASSUAN_LINELENGTH];
   struct default_inq_parm_s dfltparm;
 
@@ -2407,6 +2419,14 @@ agent_import_key (ctrl_t ctrl, const char *desc, char **cache_nonce_addr,
     return err;
   dfltparm.ctx = agent_ctx;
 
+  if (timestamp)
+    {
+      strcpy (timestamparg, " --timestamp=");
+      epoch2isotime (timestamparg+13, timestamp);
+    }
+  else
+    *timestamparg = 0;
+
   if (desc)
     {
       snprintf (line, DIM(line), "SETKEYDESC %s", desc);
@@ -2420,7 +2440,8 @@ agent_import_key (ctrl_t ctrl, const char *desc, char **cache_nonce_addr,
   parm.key    = key;
   parm.keylen = keylen;
 
-  snprintf (line, sizeof line, "IMPORT_KEY%s%s%s%s",
+  snprintf (line, sizeof line, "IMPORT_KEY%s%s%s%s%s",
+            *timestamparg? timestamparg : "",
             unattended? " --unattended":"",
             force? " --force":"",
             cache_nonce_addr && *cache_nonce_addr? " ":"",

g10/call-agent.h

@@ -166,7 +166,7 @@ gpg_error_t agent_get_keyinfo (ctrl_t ctrl, const char *hexkeygrip,
 gpg_error_t agent_genkey (ctrl_t ctrl,
                           char **cache_nonce_addr, char **passwd_nonce_addr,
                           const char *keyparms, int no_protection,
-                          const char *passphrase,
+                          const char *passphrase, time_t timestamp,
                           gcry_sexp_t *r_pubkey);
 
 /* Read a public key.  */
@@ -196,7 +196,8 @@ gpg_error_t agent_keywrap_key (ctrl_t ctrl, int forexport,
 gpg_error_t agent_import_key (ctrl_t ctrl, const char *desc,
                               char **cache_nonce_addr, const void *key,
                               size_t keylen, int unattended, int force,
-                              u32 *keyid, u32 *mainkeyid, int pubkey_algo);
+                              u32 *keyid, u32 *mainkeyid, int pubkey_algo,
+                              u32 timestamp);
 
 /* Receive a key from the agent.  */
 gpg_error_t agent_export_key (ctrl_t ctrl, const char *keygrip,

g10/import.c

@@ -2630,7 +2630,8 @@ transfer_secret_keys (ctrl_t ctrl, struct import_stats_s *stats,
         char *desc = gpg_format_keydesc (ctrl, pk, FORMAT_KEYDESC_IMPORT, 1);
         err = agent_import_key (ctrl, desc, &cache_nonce,
                                 wrappedkey, wrappedkeylen, batch, force,
-				pk->keyid, pk->main_keyid, pk->pubkey_algo);
+				pk->keyid, pk->main_keyid, pk->pubkey_algo,
+                                pk->timestamp);
         xfree (desc);
       }
       if (!err)

g10/keygen.c

@@ -1367,7 +1367,7 @@ common_gen (const char *keyparms, int algo, const char *algoelem,
 
   err = agent_genkey (NULL, cache_nonce_addr, passwd_nonce_addr, keyparms,
                       !!(keygen_flags & KEYGEN_FLAG_NO_PROTECTION),
-                      passphrase,
+                      passphrase, timestamp,
                       &s_key);
   if (err)
     {

sm/call-agent.c

@@ -565,7 +565,7 @@ inq_genkey_parms (void *opaque, const char *line)
 
 
 
-/* Call the agent to generate a newkey */
+/* Call the agent to generate a new key */
 int
 gpgsm_agent_genkey (ctrl_t ctrl,
                     ksba_const_sexp_t keyparms, ksba_sexp_t *r_pubkey)
@@ -575,6 +575,8 @@ gpgsm_agent_genkey (ctrl_t ctrl,
   membuf_t data;
   size_t len;
   unsigned char *buf;
+  gnupg_isotime_t timebuf;
+  char line[ASSUAN_LINELENGTH];
 
   *r_pubkey = NULL;
   rc = start_agent (ctrl);
@@ -592,7 +594,9 @@ gpgsm_agent_genkey (ctrl_t ctrl,
   gk_parm.sexplen = gcry_sexp_canon_len (keyparms, 0, NULL, NULL);
   if (!gk_parm.sexplen)
     return gpg_error (GPG_ERR_INV_VALUE);
-  rc = assuan_transact (agent_ctx, "GENKEY",
+  gnupg_get_isotime (timebuf);
+  snprintf (line, sizeof line, "GENKEY --timestamp=%s", timebuf);
+  rc = assuan_transact (agent_ctx, line,
                         put_membuf_cb, &data,
                         inq_genkey_parms, &gk_parm, NULL, NULL);
   if (rc)
@@ -1344,6 +1348,8 @@ gpgsm_agent_import_key (ctrl_t ctrl, const void *key, size_t keylen)
 {
   gpg_error_t err;
   struct import_key_parm_s parm;
+  gnupg_isotime_t timebuf;
+  char line[ASSUAN_LINELENGTH];
 
   err = start_agent (ctrl);
   if (err)
@@ -1354,7 +1360,9 @@ gpgsm_agent_import_key (ctrl_t ctrl, const void *key, size_t keylen)
   parm.key    = key;
   parm.keylen = keylen;
 
-  err = assuan_transact (agent_ctx, "IMPORT_KEY",
+  gnupg_get_isotime (timebuf);
+  snprintf (line, sizeof line, "IMPORT_KEY --timestamp=%s", timebuf);
+  err = assuan_transact (agent_ctx, line,
                          NULL, NULL, inq_import_key_parms, &parm, NULL, NULL);
   return err;
 }