Started to code a --server mode.
[gnupg.git] / g10 / pkclist.c
index 8d869cd..6588802 100644 (file)
@@ -1,6 +1,6 @@
-/* pkclist.c
- * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003,
- *               2004 Free Software Foundation, Inc.
+/* pkclist.c - create a list of public keys
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ *               2006 Free Software Foundation, Inc.
  *
  * This file is part of GnuPG.
  *
@@ -16,7 +16,8 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+ * USA.
  */
 
 #include <config.h>
 #include <errno.h>
 #include <assert.h>
 
+#include "gpg.h"
 #include "options.h"
 #include "packet.h"
 #include "errors.h"
 #include "keydb.h"
-#include "memory.h"
 #include "util.h"
 #include "main.h"
 #include "trustdb.h"
@@ -72,10 +73,10 @@ do_show_revocation_reason( PKT_signature *sig )
 
        log_info( _("reason for revocation: ") );
        if( text )
-           fputs( text, log_stream() );
+           fputs( text, log_get_stream() );
        else
-           fprintf( log_stream(), "code=%02x", *p );
-       putc( '\n', log_stream() );
+           fprintf( log_get_stream(), "code=%02x", *p );
+       log_printf ("\n");
        n--; p++;
        pp = NULL;
        do {
@@ -87,9 +88,9 @@ do_show_revocation_reason( PKT_signature *sig )
            if( n ) {
                pp = memchr( p, '\n', n );
                nn = pp? pp - p : n;
-               log_info( _("revocation comment: ") );
-               print_string( log_stream(), p, nn, 0 );
-               putc( '\n', log_stream() );
+               log_info ( _("revocation comment: ") );
+               print_string ( log_get_stream(), p, nn, 0 );
+               log_printf ("\n");
                p += nn; n -= nn;
            }
        } while( pp );
@@ -181,7 +182,7 @@ do_edit_ownertrust (PKT_public_key *pk, int mode,
 
   switch(minimum)
     {
-    default:              min_num=0; break;
+    default:
     case TRUST_UNDEFINED: min_num=1; break;
     case TRUST_NEVER:     min_num=2; break;
     case TRUST_MARGINAL:  min_num=3; break;
@@ -190,7 +191,18 @@ do_edit_ownertrust (PKT_public_key *pk, int mode,
 
   keyid_from_pk (pk, keyid);
   for(;;) {
-    /* a string with valid answers */
+    /* A string with valid answers.
+
+       Note to translators: These are the allowed answers in lower and
+       uppercase.  Below you will find the matching strings which
+       should be translated accordingly and the letter changed to
+       match the one in the answer string.
+    
+         i = please show me more information
+         m = back to the main menu
+         s = skip this key
+        q = quit
+    */
     const char *ans = _("iImMqQsS");
 
     if( !did_help ) 
@@ -204,8 +216,8 @@ do_edit_ownertrust (PKT_public_key *pk, int mode,
                       pubkey_letter( pk->pubkey_algo ),
                        keystr(keyid), datestr_from_pk( pk ) );
            p=get_user_id_native(keyid);
-           tty_printf(_("          \"%s\"\n"),p);
-           m_free(p);
+           tty_printf(_("      \"%s\"\n"),p);
+           xfree(p);
 
             keyblock = get_pubkeyblock (keyid);
             if (!keyblock)
@@ -231,38 +243,50 @@ do_edit_ownertrust (PKT_public_key *pk, int mode,
                p=utf8_to_native(un->pkt->pkt.user_id->name,
                                 un->pkt->pkt.user_id->len,0);
 
-               tty_printf(_("      aka \"%s\"\n"),p);
+               tty_printf(_("  aka \"%s\"\n"),p);
              }
         
             print_fingerprint (pk, NULL, 2);
             tty_printf("\n");
            release_kbnode (keyblock);
           }
-       /* This string also used in keyedit.c:sign_uids */
-        tty_printf (_(
-                     "Please decide how far you trust this user to correctly\n"
-                     "verify other users' keys (by looking at passports,\n"
-                     "checking fingerprints from different sources...)?\n\n"));
+
+       if(opt.trust_model==TM_DIRECT)
+         {
+           tty_printf(_("How much do you trust that this key actually "
+                        "belongs to the named user?\n"));
+           tty_printf("\n");
+         }
+       else
+         {
+           /* This string also used in keyedit.c:trustsig_prompt */
+           tty_printf(_("Please decide how far you trust this user to"
+                        " correctly verify other users' keys\n"
+                        "(by looking at passports, checking fingerprints from"
+                        " different sources, etc.)\n"));
+           tty_printf("\n");
+         }
+
        if(min_num<=1)
-         tty_printf (_(" %d = I don't know or won't say\n"), 1);
+         tty_printf (_("  %d = I don't know or won't say\n"), 1);
        if(min_num<=2)
-         tty_printf (_(" %d = I do NOT trust\n"), 2);
+         tty_printf (_("  %d = I do NOT trust\n"), 2);
        if(min_num<=3)
-         tty_printf (_(" %d = I trust marginally\n"), 3);
+         tty_printf (_("  %d = I trust marginally\n"), 3);
        if(min_num<=4)
-         tty_printf (_(" %d = I trust fully\n"), 4);
+         tty_printf (_("  %d = I trust fully\n"), 4);
         if (mode)
-          tty_printf (_(" %d = I trust ultimately\n"), 5);
+          tty_printf (_("  %d = I trust ultimately\n"), 5);
 #if 0
        /* not yet implemented */
-        tty_printf (_(" i = please show me more information\n") );
+        tty_printf ("  i = please show me more information\n");
 #endif
         if( mode )
-          tty_printf(_(" m = back to the main menu\n"));
+          tty_printf(_("  m = back to the main menu\n"));
         else
          {
-           tty_printf(_(" s = skip this key\n"));
-           tty_printf(_(" q = quit\n"));
+           tty_printf(_("  s = skip this key\n"));
+           tty_printf(_("  q = quit\n"));
          }
         tty_printf("\n");
        if(minimum)
@@ -325,9 +349,9 @@ do_edit_ownertrust (PKT_public_key *pk, int mode,
         quit = 1;
         break ; /* back to the menu */
       }
-    m_free(p); p = NULL;
+    xfree(p); p = NULL;
   }
-  m_free(p);
+  xfree(p);
   return show? -2: quit? -1 : changed;
 }
 
@@ -339,7 +363,7 @@ do_edit_ownertrust (PKT_public_key *pk, int mode,
 int
 edit_ownertrust (PKT_public_key *pk, int mode )
 {
-  unsigned int trust;
+  unsigned int trust = 0;
   int no_help = 0;
 
   for(;;)
@@ -412,7 +436,7 @@ do_we_trust( PKT_public_key *pk, unsigned int trustlevel )
       return 1; /* yes */
     }
 
-  return 1; /* yes */
+  return 1; /*NOTREACHED*/
 }
 
 
@@ -460,7 +484,7 @@ do_we_trust_pre( PKT_public_key *pk, unsigned int trustlevel )
 int
 check_signatures_trust( PKT_signature *sig )
 {
-  PKT_public_key *pk = m_alloc_clear( sizeof *pk );
+  PKT_public_key *pk = xmalloc_clear( sizeof *pk );
   unsigned int trustlevel;
   int rc=0;
 
@@ -495,7 +519,7 @@ check_signatures_trust( PKT_signature *sig )
                   " designated revoker!\n"));
       else
        log_info(_("WARNING: This key has been revoked by its owner!\n"));
-      log_info(_("         This could mean that the signature is forgery.\n"));
+      log_info(_("         This could mean that the signature is forged.\n"));
       show_revocation_reason( pk, 0 );
     }
   else if ((trustlevel & TRUST_FLAG_SUB_REVOKED) ) 
@@ -508,6 +532,59 @@ check_signatures_trust( PKT_signature *sig )
   if ((trustlevel & TRUST_FLAG_DISABLED))
     log_info (_("Note: This key has been disabled.\n"));
 
+  /* If we have PKA information adjust the trustlevel. */
+  if (sig->pka_info && sig->pka_info->valid)
+    {
+      unsigned char fpr[MAX_FINGERPRINT_LEN];
+      PKT_public_key *primary_pk;
+      size_t fprlen;
+      int okay;
+
+
+      primary_pk = xmalloc_clear (sizeof *primary_pk);
+      get_pubkey (primary_pk, pk->main_keyid);
+      fingerprint_from_pk (primary_pk, fpr, &fprlen);
+      free_public_key (primary_pk);
+
+      if ( fprlen == 20 && !memcmp (sig->pka_info->fpr, fpr, 20) )
+        {
+          okay = 1;
+          write_status_text (STATUS_PKA_TRUST_GOOD, sig->pka_info->email);
+          log_info (_("Note: Verified signer's address is `%s'\n"),
+                    sig->pka_info->email);
+        }
+      else
+        {
+          okay = 0;
+          write_status_text (STATUS_PKA_TRUST_BAD, sig->pka_info->email);
+          log_info (_("Note: Signer's address `%s' "
+                      "does not match DNS entry\n"), sig->pka_info->email);
+        }
+
+      switch ( (trustlevel & TRUST_MASK) ) 
+        {
+        case TRUST_UNKNOWN: 
+        case TRUST_UNDEFINED:
+        case TRUST_MARGINAL:
+          if (okay && opt.verify_options&VERIFY_PKA_TRUST_INCREASE)
+            {
+              trustlevel = ((trustlevel & ~TRUST_MASK) | TRUST_FULLY);
+              log_info (_("trustlevel adjusted to FULL"
+                          " due to valid PKA info\n"));
+            }
+          /* (fall through) */
+        case TRUST_FULLY:
+          if (!okay)
+            {
+              trustlevel = ((trustlevel & ~TRUST_MASK) | TRUST_NEVER);
+              log_info (_("trustlevel adjusted to NEVER"
+                          " due to bad PKA info\n"));
+            }
+          break;
+        }
+    }
+
+  /* Now let the user know what up with the trustlevel. */
   switch ( (trustlevel & TRUST_MASK) ) 
     {
     case TRUST_EXPIRED:
@@ -536,7 +613,7 @@ check_signatures_trust( PKT_signature *sig )
       log_info(_("         The signature is probably a FORGERY.\n"));
       if (opt.with_fingerprint)
         print_fingerprint (pk, NULL, 1);
-      rc = G10ERR_BAD_SIGN;
+      rc = gpg_error (GPG_ERR_BAD_SIGNATURE);
       break;
 
     case TRUST_MARGINAL:
@@ -575,7 +652,7 @@ release_pk_list( PK_LIST pk_list )
     for( ; pk_list; pk_list = pk_rover ) {
        pk_rover = pk_list->next;
        free_public_key( pk_list->pk );
-       m_free( pk_list );
+       xfree( pk_list );
     }
 }
 
@@ -604,10 +681,10 @@ default_recipient(void)
     int i;
 
     if( opt.def_recipient )
-       return m_strdup( opt.def_recipient );
+       return xstrdup( opt.def_recipient );
     if( !opt.def_recipient_self )
        return NULL;
-    sk = m_alloc_clear( sizeof *sk );
+    sk = xmalloc_clear( sizeof *sk );
     i = get_seckey_byname( sk, NULL, 0 );
     if( i ) {
        free_secret_key( sk );
@@ -616,7 +693,7 @@ default_recipient(void)
     n = MAX_FINGERPRINT_LEN;
     fingerprint_from_sk( sk, fpr, &n );
     free_secret_key( sk );
-    p = m_alloc( 2*n+3 );
+    p = xmalloc( 2*n+3 );
     *p++ = '0';
     *p++ = 'x';
     for(i=0; i < n; i++ )
@@ -626,7 +703,7 @@ default_recipient(void)
 }
 
 static int
-expand_id(const char *id,STRLIST *into,unsigned int flags)
+expand_id(const char *id,strlist_t *into,unsigned int flags)
 {
   struct groupitem *groups;
   int count=0;
@@ -636,7 +713,7 @@ expand_id(const char *id,STRLIST *into,unsigned int flags)
       /* need strcasecmp() here, as this should be localized */
       if(strcasecmp(groups->name,id)==0)
        {
-         STRLIST each,sl;
+         strlist_t each,sl;
 
          /* this maintains the current utf8-ness */
          for(each=groups->values;each;each=each->next)
@@ -655,10 +732,10 @@ expand_id(const char *id,STRLIST *into,unsigned int flags)
 
 /* For simplicity, and to avoid potential loops, we only expand once -
    you can't make an alias that points to an alias. */
-static STRLIST
-expand_group(STRLIST input)
+static strlist_t
+expand_group(strlist_t input)
 {
-  STRLIST sl,output=NULL,rover;
+  strlist_t sl,output=NULL,rover;
 
   for(rover=input;rover;rover=rover->next)
     if(expand_id(rover->d,&output,rover->flags)==0)
@@ -671,326 +748,423 @@ expand_group(STRLIST input)
   return output;
 }
 
+
+/* This is the central function to collect the keys for recipients.
+   It is thus used to prepare a public key encryption. encrypt-to
+   keys, default keys and the keys for the actual recipients are all
+   collected here.  When not in batch mode and no recipient has been
+   passed on the commandline, the function will also ask for
+   recipients.
+
+   RCPTS is a string list with the recipients; NULL is an allowed
+   value but not very useful.  Group expansion is done on these names;
+   they may be in any of the user Id formats we can handle.  The flags
+   bits for each string in the string list are used for:
+     Bit 0: This is an encrypt-to recipient.
+     Bit 1: This is a hidden recipient.
+
+   USE is the desired use for the key - usually PUBKEY_USAGE_ENC.
+   RET_PK_LIST.
+
+   On success a list of keys is stored at the address RET_PK_LIST; the
+   caller must free this list.  On error the value at this address is
+   not changed.
+ */
 int
-build_pk_list( STRLIST rcpts, PK_LIST *ret_pk_list, unsigned use )
+build_pk_list( strlist_t rcpts, PK_LIST *ret_pk_list, unsigned int use )
 {
-    PK_LIST pk_list = NULL;
-    PKT_public_key *pk=NULL;
-    int rc=0;
-    int any_recipients=0;
-    STRLIST rov,remusr;
-    char *def_rec = NULL;
-
-    if(opt.grouplist)
-      remusr=expand_group(rcpts);
-    else
-      remusr=rcpts;
-
-    /* check whether there are any recipients in the list and build the
-     * list of the encrypt-to ones (we always trust them) */
-    for( rov = remusr; rov; rov = rov->next ) {
-       if( !(rov->flags & 1) )
-         {
-           any_recipients = 1;
+  PK_LIST pk_list = NULL;
+  PKT_public_key *pk=NULL;
+  int rc=0;
+  int any_recipients=0;
+  strlist_t rov,remusr;
+  char *def_rec = NULL;
 
-           if((rov->flags&2) && (PGP2 || PGP6 || PGP7 || PGP8))
-             {
-               log_info(_("you may not use %s while in %s mode\n"),
-                        "--hidden-recipient",
-                        compliance_option_string());
+  /* Try to expand groups if any have been defined. */
+  if (opt.grouplist)
+    remusr = expand_group (rcpts);
+  else
+    remusr = rcpts;
 
-               compliance_failure();
-             }
-         }
-       else if( (use & PUBKEY_USAGE_ENC) && !opt.no_encrypt_to ) {
-           pk = m_alloc_clear( sizeof *pk );
-           pk->req_usage = use;
-           /* We can encrypt-to a disabled key */
-           if( (rc = get_pubkey_byname( pk, rov->d, NULL, NULL, 1 )) ) {
-               free_public_key( pk ); pk = NULL;
-               log_error(_("%s: skipped: %s\n"), rov->d, g10_errstr(rc) );
-                write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
-                                              rov->d, strlen (rov->d), -1);
-               goto fail;
+  /* Check whether there are any recipients in the list and build the
+   * list of the encrypt-to ones (we always trust them). */
+  for ( rov = remusr; rov; rov = rov->next ) 
+    {
+      if ( !(rov->flags & 1) )
+        {
+          /* This is a regular recipient; i.e. not an encrypt-to
+             one. */
+          any_recipients = 1;
+
+          /* Hidden recipients are not allowed while in PGP mode,
+             issue a warning and switch into GnuPG mode. */
+          if ((rov->flags&2) && (PGP2 || PGP6 || PGP7 || PGP8))
+            {
+              log_info(_("you may not use %s while in %s mode\n"),
+                       "--hidden-recipient",
+                       compliance_option_string());
+
+              compliance_failure();
             }
-           else if( !(rc=check_pubkey_algo2(pk->pubkey_algo, use )) ) {
-               /* Skip the actual key if the key is already present
-                * in the list */
-               if (key_present_in_pk_list(pk_list, pk) == 0) {
-                   free_public_key(pk); pk = NULL;
-                   log_info(_("%s: skipped: public key already present\n"),
-                                                           rov->d);
-               }
-               else {
-                   PK_LIST r;
-                   r = m_alloc( sizeof *r );
-                   r->pk = pk; pk = NULL;
-                   r->next = pk_list;
-                   r->flags = (rov->flags&2)?1:0;
-                   pk_list = r;
-
-                   if(r->flags&1 && (PGP2 || PGP6 || PGP7 || PGP8))
-                     {
-                       log_info(_("you may not use %s while in %s mode\n"),
-                                "--hidden-encrypt-to",
-                                compliance_option_string());
-
-                       compliance_failure();
-                     }
-               }
-           }
-           else {
-               free_public_key( pk ); pk = NULL;
-               log_error(_("%s: skipped: %s\n"), rov->d, g10_errstr(rc) );
-                write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
-                                              rov->d, strlen (rov->d), -1);
-               goto fail;
-           }
-       }
+        }
+      else if ( (use & PUBKEY_USAGE_ENC) && !opt.no_encrypt_to ) 
+        {
+          /* Encryption has been requested and --encrypt-to has not
+             been disabled.  Check this encrypt-to key. */
+          pk = xmalloc_clear( sizeof *pk );
+          pk->req_usage = use;
+
+          /* We explicitly allow encrypt-to to an disabled key; thus
+             we pass 1 as last argument. */
+          if ( (rc = get_pubkey_byname ( pk, rov->d, NULL, NULL, 1 )) ) 
+            {
+              free_public_key ( pk ); pk = NULL;
+              log_error (_("%s: skipped: %s\n"), rov->d, g10_errstr(rc) );
+              write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
+                                            rov->d, strlen (rov->d), -1);
+              goto fail;
+            }
+          else if ( !(rc=openpgp_pk_test_algo2 (pk->pubkey_algo, use)) ) 
+            {
+              /* Skip the actual key if the key is already present
+               * in the list.  Add it to our list if not. */
+              if (key_present_in_pk_list(pk_list, pk) == 0)
+                {
+                  free_public_key (pk); pk = NULL;
+                  log_info (_("%s: skipped: public key already present\n"),
+                            rov->d);
+                }
+              else
+                {
+                  PK_LIST r;
+                  r = xmalloc( sizeof *r );
+                  r->pk = pk; pk = NULL;
+                  r->next = pk_list;
+                  r->flags = (rov->flags&2)?1:0;
+                  pk_list = r;
+
+                  /* Hidden encrypt-to recipients are not allowed while
+                     in PGP mode, issue a warning and switch into
+                     GnuPG mode. */
+                  if ((r->flags&1) && (PGP2 || PGP6 || PGP7 || PGP8))
+                    {
+                      log_info(_("you may not use %s while in %s mode\n"),
+                               "--hidden-encrypt-to",
+                               compliance_option_string());
+
+                      compliance_failure();
+                    }
+                }
+            }
+          else 
+            {
+              /* The public key is not usable for encryption or not
+                 available. */
+              free_public_key( pk ); pk = NULL;
+              log_error(_("%s: skipped: %s\n"), rov->d, g10_errstr(rc) );
+              write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
+                                            rov->d, strlen (rov->d), -1);
+              goto fail;
+            }
+        }
     }
 
-    if( !any_recipients && !opt.batch ) { /* ask */
-       int have_def_rec;
-       char *answer=NULL;
-       STRLIST backlog=NULL;
-
-       if(pk_list)
-         any_recipients = 1;
-       def_rec = default_recipient();
-       have_def_rec = !!def_rec;
-       if( !have_def_rec )
-           tty_printf(_(
-               "You did not specify a user ID. (you may use \"-r\")\n"));
-       for(;;) {
-           rc = 0;
-           m_free(answer);
-           if( have_def_rec ) {
-               answer = def_rec;
-               def_rec = NULL;
-           }
-           else if(backlog) {
-             answer=pop_strlist(&backlog);
-           }
-           else
-             {
-               PK_LIST iter;
-
-               tty_printf("\n");
-               tty_printf(_("Current recipients:\n"));
-               for(iter=pk_list;iter;iter=iter->next)
-                 {
-                   u32 keyid[2];
-
-                   keyid_from_pk(iter->pk,keyid);
-                   tty_printf("%4u%c/%s %s \"",
-                              nbits_from_pk(iter->pk),
-                              pubkey_letter(iter->pk->pubkey_algo),
-                              keystr(keyid),
-                              datestr_from_pk(iter->pk));
-
-                   if(iter->pk->user_id)
-                     tty_print_utf8_string(iter->pk->user_id->name,
-                                           iter->pk->user_id->len);
-                   else
-                     {
-                       size_t n;
-                       char *p = get_user_id( keyid, &n );
-                       tty_print_utf8_string( p, n );
-                       m_free(p);
-                     }
-                   tty_printf("\"\n");
-                 }
-
-               answer = cpr_get_utf8("pklist.user_id.enter",
-                        _("\nEnter the user ID.  End with an empty line: "));
-               trim_spaces(answer);
-               cpr_kill_prompt();
-             }
-           if( !answer || !*answer ) {
-               m_free(answer);
-               break;
-           }
-           if(expand_id(answer,&backlog,0))
-             continue;
-           if( pk )
-               free_public_key( pk );
-           pk = m_alloc_clear( sizeof *pk );
-           pk->req_usage = use;
-           rc = get_pubkey_byname( pk, answer, NULL, NULL, 0 );
-           if( rc )
-               tty_printf(_("No such user ID.\n"));
-           else if( !(rc=check_pubkey_algo2(pk->pubkey_algo, use)) ) {
-               if( have_def_rec ) {
-                   if (key_present_in_pk_list(pk_list, pk) == 0) {
-                       free_public_key(pk); pk = NULL;
-                       log_info(_("skipped: public key "
-                                  "already set as default recipient\n") );
-                   }
-                   else {
-                       PK_LIST r = m_alloc( sizeof *r );
-                       r->pk = pk; pk = NULL;
-                       r->next = pk_list;
-                       r->flags = 0; /* no throwing default ids */
-                       pk_list = r;
-                   }
-                   any_recipients = 1;
-                   continue;
-               }
-               else {
-                   int trustlevel;
+  /* If we don't have any recipients yet and we are not in batch mode
+     drop into interactive selection mode. */
+  if ( !any_recipients && !opt.batch ) 
+    { 
+      int have_def_rec;
+      char *answer = NULL;
+      strlist_t backlog = NULL;
+
+      if (pk_list)
+        any_recipients = 1;
+      def_rec = default_recipient();
+      have_def_rec = !!def_rec;
+      if ( !have_def_rec )
+        tty_printf(_("You did not specify a user ID. (you may use \"-r\")\n"));
+
+      for (;;) 
+        {
+          rc = 0;
+          xfree(answer);
+          if ( have_def_rec )
+            {
+              /* A default recipient is taken as the first entry. */
+              answer = def_rec;
+              def_rec = NULL;
+            }
+          else if (backlog) 
+            {
+              /* This is part of our trick to expand and display groups. */
+              answer = strlist_pop (&backlog);
+            }
+          else
+            {
+              /* Show the list of already collected recipients and ask
+                 for more. */
+              PK_LIST iter;
+
+              tty_printf("\n");
+              tty_printf(_("Current recipients:\n"));
+              for (iter=pk_list;iter;iter=iter->next)
+                {
+                  u32 keyid[2];
+
+                  keyid_from_pk(iter->pk,keyid);
+                  tty_printf("%4u%c/%s %s \"",
+                             nbits_from_pk(iter->pk),
+                             pubkey_letter(iter->pk->pubkey_algo),
+                             keystr(keyid),
+                             datestr_from_pk(iter->pk));
+
+                  if (iter->pk->user_id)
+                    tty_print_utf8_string(iter->pk->user_id->name,
+                                          iter->pk->user_id->len);
+                  else
+                    {
+                      size_t n;
+                      char *p = get_user_id( keyid, &n );
+                      tty_print_utf8_string( p, n );
+                      xfree(p);
+                    }
+                  tty_printf("\"\n");
+                }
+
+              answer = cpr_get_utf8("pklist.user_id.enter",
+                                    _("\nEnter the user ID.  "
+                                      "End with an empty line: "));
+              trim_spaces(answer);
+              cpr_kill_prompt();
+            }
+          
+          if ( !answer || !*answer ) 
+            {
+              xfree(answer);
+              break;  /* No more recipients entered - get out of loop. */
+            }
+
+          /* Do group expand here too.  The trick here is to continue
+             the loop if any expansion occured.  The code above will
+             then list all expanded keys. */
+          if (expand_id(answer,&backlog,0))
+            continue;
+
+          /* Get and check key for the current name. */
+          if (pk)
+            free_public_key (pk);
+          pk = xmalloc_clear( sizeof *pk );
+          pk->req_usage = use;
+          rc = get_pubkey_byname( pk, answer, NULL, NULL, 0 );
+          if (rc)
+            tty_printf(_("No such user ID.\n"));
+          else if ( !(rc=openpgp_pk_test_algo2 (pk->pubkey_algo, use)) ) 
+            {
+              if ( have_def_rec )
+                {
+                  /* No validation for a default recipient. */
+                  if (!key_present_in_pk_list(pk_list, pk)) 
+                    {
+                      free_public_key (pk); pk = NULL;
+                      log_info (_("skipped: public key "
+                                  "already set as default recipient\n") );
+                    }
+                  else
+                    {
+                      PK_LIST r = xmalloc (sizeof *r);
+                      r->pk = pk; pk = NULL;
+                      r->next = pk_list;
+                      r->flags = 0; /* No throwing default ids. */
+                      pk_list = r;
+                    }
+                  any_recipients = 1;
+                  continue;
+                }
+              else
+                { /* Check validity of this key. */
+                  int trustlevel;
                    
-                   trustlevel = get_validity (pk, pk->user_id);
-                   if( (trustlevel & TRUST_FLAG_DISABLED) ) {
-                       tty_printf(_("Public key is disabled.\n") );
-                   }
-                   else if( do_we_trust_pre( pk, trustlevel ) ) {
-                       /* Skip the actual key if the key is already present
-                        * in the list */
-                       if (key_present_in_pk_list(pk_list, pk) == 0) {
-                           free_public_key(pk); pk = NULL;
-                           log_info(_("skipped: public key already set\n") );
-                       }
-                       else {
-                           PK_LIST r;
-                           r = m_alloc( sizeof *r );
-                           r->pk = pk; pk = NULL;
-                           r->next = pk_list;
-                           r->flags = 0; /* no throwing interactive ids */
-                           pk_list = r;
-                       }
-                       any_recipients = 1;
-                       continue;
-                   }
-               }
-           }
-           m_free(def_rec); def_rec = NULL;
-           have_def_rec = 0;
-       }
-       if( pk ) {
-           free_public_key( pk );
-           pk = NULL;
-       }
+                  trustlevel = get_validity (pk, pk->user_id);
+                  if ( (trustlevel & TRUST_FLAG_DISABLED) ) 
+                    {
+                      tty_printf (_("Public key is disabled.\n") );
+                    }
+                  else if ( do_we_trust_pre (pk, trustlevel) ) 
+                    {
+                      /* Skip the actual key if the key is already
+                       * present in the list */
+                      if (!key_present_in_pk_list(pk_list, pk))
+                        {
+                          free_public_key(pk); pk = NULL;
+                          log_info(_("skipped: public key already set\n") );
+                        }
+                      else
+                        {
+                          PK_LIST r;
+                          r = xmalloc( sizeof *r );
+                          r->pk = pk; pk = NULL;
+                          r->next = pk_list;
+                          r->flags = 0; /* No throwing interactive ids. */
+                          pk_list = r;
+                        }
+                      any_recipients = 1;
+                      continue;
+                    }
+                }
+            }
+          xfree(def_rec); def_rec = NULL;
+          have_def_rec = 0;
+        }
+      if ( pk )
+        {
+          free_public_key( pk );
+          pk = NULL;
+        }
     }
-    else if( !any_recipients && (def_rec = default_recipient()) ) {
-       pk = m_alloc_clear( sizeof *pk );
-       pk->req_usage = use;
-       /* The default recipient may be disabled */
-       rc = get_pubkey_byname( pk, def_rec, NULL, NULL, 1 );
-       if( rc )
-           log_error(_("unknown default recipient `%s'\n"), def_rec );
-       else if( !(rc=check_pubkey_algo2(pk->pubkey_algo, use)) ) {
-         /* Mark any_recipients here since the default recipient
+  else if ( !any_recipients && (def_rec = default_recipient()) ) 
+    {
+      /* We are in batch mode and have only a default recipient. */
+      pk = xmalloc_clear( sizeof *pk );
+      pk->req_usage = use;
+
+      /* The default recipient is allowed to be disabled; thus pass 1
+         as last argument. */
+      rc = get_pubkey_byname (pk, def_rec, NULL, NULL, 1);
+      if (rc)
+        log_error(_("unknown default recipient \"%s\"\n"), def_rec );
+      else if ( !(rc=openpgp_pk_test_algo2(pk->pubkey_algo, use)) ) 
+        {
+          /* Mark any_recipients here since the default recipient
              would have been used if it wasn't already there.  It
              doesn't really matter if we got this key from the default
              recipient or an encrypt-to. */
-         any_recipients = 1;
-         if (key_present_in_pk_list(pk_list, pk) == 0)
-           log_info(_("skipped: public key already set as default recipient\n"));
-         else {
-           PK_LIST r = m_alloc( sizeof *r );
-           r->pk = pk; pk = NULL;
-           r->next = pk_list;
-           r->flags = 0; /* no throwing default ids */
-           pk_list = r;
-         }
-       }
-       if( pk ) {
-           free_public_key( pk );
-           pk = NULL;
-       }
-       m_free(def_rec); def_rec = NULL;
+          any_recipients = 1;
+          if (!key_present_in_pk_list(pk_list, pk))
+            log_info (_("skipped: public key already set "
+                        "as default recipient\n"));
+          else 
+            {
+              PK_LIST r = xmalloc( sizeof *r );
+              r->pk = pk; pk = NULL;
+              r->next = pk_list;
+              r->flags = 0; /* No throwing default ids. */
+              pk_list = r;
+            }
+        }
+      if ( pk )
+        {
+          free_public_key( pk );
+          pk = NULL;
+        }
+      xfree(def_rec); def_rec = NULL;
     }
-    else {
-       any_recipients = 0;
-       for(; remusr; remusr = remusr->next ) {
-           if( (remusr->flags & 1) )
-               continue; /* encrypt-to keys are already handled */
-
-           pk = m_alloc_clear( sizeof *pk );
-           pk->req_usage = use;
-           if( (rc = get_pubkey_byname( pk, remusr->d, NULL, NULL, 0 )) ) {
-               free_public_key( pk ); pk = NULL;
-               log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
-                write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
-                                              remusr->d, strlen (remusr->d),
-                                              -1);
-               goto fail;
-           }
-           else if( !(rc=check_pubkey_algo2(pk->pubkey_algo, use )) ) {
-               int trustlevel;
-
-               trustlevel = get_validity (pk, pk->user_id);
-               if( (trustlevel & TRUST_FLAG_DISABLED) ) {
-                   free_public_key(pk); pk = NULL;
-                   log_info(_("%s: skipped: public key is disabled\n"),
-                                                                   remusr->d);
-                    write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
-                                                  remusr->d,
-                                                  strlen (remusr->d),
-                                                  -1);
-                   rc=G10ERR_UNU_PUBKEY;
-                   goto fail;
-               }
-               else if( do_we_trust_pre( pk, trustlevel ) ) {
-                   /* note: do_we_trust may have changed the trustlevel */
-
-                   /* We have at least one valid recipient. It doesn't matters
-                    * if this recipient is already present. */
-                   any_recipients = 1;
-
-                   /* Skip the actual key if the key is already present
-                    * in the list */
-                   if (key_present_in_pk_list(pk_list, pk) == 0) {
-                       free_public_key(pk); pk = NULL;
-                       log_info(_("%s: skipped: public key already present\n"),
-                                                                   remusr->d);
-                   }
-                   else {
-                       PK_LIST r;
-                       r = m_alloc( sizeof *r );
-                       r->pk = pk; pk = NULL;
-                       r->next = pk_list;
-                       r->flags = (remusr->flags&2)?1:0;
-                       pk_list = r;
-                   }
-               }
-               else { /* we don't trust this pk */
-                   free_public_key( pk ); pk = NULL;
-                    write_status_text_and_buffer (STATUS_INV_RECP, "10 ",
-                                                  remusr->d,
-                                                  strlen (remusr->d),
-                                                  -1);
-                   rc=G10ERR_UNU_PUBKEY;
-                   goto fail;
-               }
-           }
-           else {
-               free_public_key( pk ); pk = NULL;
-                write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
-                                              remusr->d,
-                                              strlen (remusr->d),
-                                              -1);
-               log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
-               goto fail;
-           }
-       }
+  else 
+    {
+      /* General case: Check all keys. */
+      any_recipients = 0;
+      for (; remusr; remusr = remusr->next ) 
+        {
+          if ( (remusr->flags & 1) )
+            continue; /* encrypt-to keys are already handled. */
+
+          pk = xmalloc_clear( sizeof *pk );
+          pk->req_usage = use;
+          if ( (rc = get_pubkey_byname( pk, remusr->d, NULL, NULL, 0 )) ) 
+            {
+              /* Key not found or other error. */
+              free_public_key( pk ); pk = NULL;
+              log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
+              write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
+                                            remusr->d, strlen (remusr->d),
+                                            -1);
+              goto fail;
+            }
+          else if ( !(rc=openpgp_pk_test_algo2(pk->pubkey_algo, use )) ) 
+            {
+              /* Key found and usable.  Check validity. */
+              int trustlevel;
+              
+              trustlevel = get_validity (pk, pk->user_id);
+              if ( (trustlevel & TRUST_FLAG_DISABLED) ) 
+                {
+                  /*Key has been disabled. */
+                  free_public_key(pk); pk = NULL;
+                  log_info(_("%s: skipped: public key is disabled\n"),
+                           remusr->d);
+                  write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
+                                                remusr->d,
+                                                strlen (remusr->d),
+                                                -1);
+                  rc=G10ERR_UNU_PUBKEY;
+                  goto fail;
+                }
+              else if ( do_we_trust_pre( pk, trustlevel ) ) 
+                {
+                  /* Note: do_we_trust may have changed the trustlevel */
+
+                  /* We have at least one valid recipient. It doesn't
+                   * matters if this recipient is already present. */
+                  any_recipients = 1;
+
+                  /* Skip the actual key if the key is already present
+                   * in the list */
+                  if (!key_present_in_pk_list(pk_list, pk)) 
+                    {
+                      free_public_key(pk); pk = NULL;
+                      log_info(_("%s: skipped: public key already present\n"),
+                               remusr->d);
+                    }
+                  else
+                    {
+                      PK_LIST r;
+                      r = xmalloc( sizeof *r );
+                      r->pk = pk; pk = NULL;
+                      r->next = pk_list;
+                      r->flags = (remusr->flags&2)?1:0;
+                      pk_list = r;
+                    }
+                }
+              else
+                { /* We don't trust this key. */
+                  free_public_key( pk ); pk = NULL;
+                  write_status_text_and_buffer (STATUS_INV_RECP, "10 ",
+                                                remusr->d,
+                                                strlen (remusr->d),
+                                                -1);
+                  rc=G10ERR_UNU_PUBKEY;
+                  goto fail;
+                }
+            }
+          else
+            {
+              /* Key found but not usable for us (e.g. sign-only key). */
+              free_public_key( pk ); pk = NULL;
+              write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
+                                            remusr->d,
+                                            strlen (remusr->d),
+                                            -1);
+              log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
+              goto fail;
+            }
+        }
     }
-
-    if( !rc && !any_recipients ) {
-       log_error(_("no valid addressees\n"));
-        write_status_text (STATUS_NO_RECP, "0");
-       rc = G10ERR_NO_USER_ID;
+  
+  if ( !rc && !any_recipients ) 
+    {
+      log_error(_("no valid addressees\n"));
+      write_status_text (STATUS_NO_RECP, "0");
+      rc = G10ERR_NO_USER_ID;
     }
-
+  
  fail:
 
-    if( rc )
-       release_pk_list( pk_list );
-    else
-       *ret_pk_list = pk_list;
-    if(opt.grouplist)
-      free_strlist(remusr);
-    return rc;
+  if ( rc )
+    release_pk_list( pk_list );
+  else
+    *ret_pk_list = pk_list;
+  if (opt.grouplist)
+    free_strlist(remusr);
+  return rc;
 }
 
 
@@ -1012,7 +1186,7 @@ build_pk_list( STRLIST rcpts, PK_LIST *ret_pk_list, unsigned use )
    preference list, so I'm including it. -dms */
 
 int
-algo_available( preftype_t preftype, int algo, void *hint )
+algo_available( preftype_t preftype, int algo, const union pref_hint *hint)
 {
   if( preftype == PREFTYPE_SYM )
     {
@@ -1032,12 +1206,24 @@ algo_available( preftype_t preftype, int algo, void *hint )
 
       /* PGP8 supports all the ciphers we do.. */
 
-      return algo && !check_cipher_algo( algo );
+      return algo && !openpgp_cipher_test_algo ( algo );
     }
   else if( preftype == PREFTYPE_HASH )
     {
-      if(hint && ((*(int *)hint) != md_digest_length(algo)))
-       return 0;
+      if (hint && hint->digest_length)
+       {
+         if (hint->digest_length!=20 || opt.flags.dsa2)
+           {
+             /* If --enable-dsa2 is set or the hash isn't 160 bits
+                (which implies DSA2), then we'll accept a hash that
+                is larger than we need.  Otherwise we won't accept
+                any hash that isn't exactly the right size. */
+             if (hint->digest_length > gcry_md_get_algo_dlen (algo))
+               return 0;
+           }
+         else if (hint->digest_length != gcry_md_get_algo_dlen (algo))
+           return 0;
+       }
 
       if((PGP6 || PGP7) && (algo != DIGEST_ALGO_MD5
                            && algo != DIGEST_ALGO_SHA1
@@ -1051,7 +1237,7 @@ algo_available( preftype_t preftype, int algo, void *hint )
                  && algo != DIGEST_ALGO_SHA256))
        return 0;
 
-      return algo && !check_digest_algo( algo );
+      return algo && !openpgp_md_test_algo (algo);
     }
   else if( preftype == PREFTYPE_ZIP )
     {
@@ -1073,7 +1259,8 @@ algo_available( preftype_t preftype, int algo, void *hint )
  * Return -1 if we could not find an algorithm.
  */
 int
-select_algo_from_prefs(PK_LIST pk_list, int preftype, int request, void *hint)
+select_algo_from_prefs(PK_LIST pk_list, int preftype, int request,
+                       const union pref_hint *hint)
 {
     PK_LIST pkr;
     u32 bits[8];
@@ -1141,9 +1328,10 @@ select_algo_from_prefs(PK_LIST pk_list, int preftype, int request, void *hint)
        }
 
 #if 0
-       log_debug("pref mask=%08lX%08lX%08lX%08lX%08lX%08lX%08lX%08lX\n",
+       log_debug("pref mask=%08lX%08lX%08lX%08lX%08lX%08lX%08lX%08lX (%s)\n",
               (ulong)mask[7], (ulong)mask[6], (ulong)mask[5], (ulong)mask[4],
-            (ulong)mask[3], (ulong)mask[2], (ulong)mask[1], (ulong)mask[0]);
+               (ulong)mask[3], (ulong)mask[2], (ulong)mask[1], (ulong)mask[0],
+               keystr_from_pk (pkr->pk));
 #endif
        for(i=0; i < 8; i++ )
            bits[i] &= mask[i];
@@ -1236,26 +1424,73 @@ select_algo_from_prefs(PK_LIST pk_list, int preftype, int request, void *hint)
 }
 
 /*
- * Select the MDC flag from the pk_list.  We can only use MDC if all recipients
- * support this feature 
+ * Select the MDC flag from the pk_list.  We can only use MDC if all
+ * recipients support this feature.
  */
 int
 select_mdc_from_pklist (PK_LIST pk_list)
 {
-    PK_LIST pkr;
+  PK_LIST pkr;
 
-    if( !pk_list )
-       return 0;
+  if ( !pk_list )
+    return 0;
+  
+  for (pkr = pk_list; pkr; pkr = pkr->next) 
+    {
+      int mdc;
+      
+      if (pkr->pk->user_id) /* selected by user ID */
+        mdc = pkr->pk->user_id->flags.mdc;
+      else
+        mdc = pkr->pk->mdc_feature;
+      if (!mdc)
+        return 0;  /* At least one recipient does not support it. */
+    }
+  return 1; /* Can be used. */
+}
 
-    for (pkr = pk_list; pkr; pkr = pkr->next) {
-        int mdc;
 
-        if (pkr->pk->user_id) /* selected by user ID */
-            mdc = pkr->pk->user_id->mdc_feature;
-        else
-            mdc = pkr->pk->mdc_feature;
-        if (!mdc)
-            return 0; /* at least one recipient does not support it */
+/* Print a warning for all keys in PK_LIST missing the MDC feature. */
+void
+warn_missing_mdc_from_pklist (PK_LIST pk_list)
+{
+  PK_LIST pkr;
+  
+  for (pkr = pk_list; pkr; pkr = pkr->next) 
+    {
+      int mdc;
+
+      if (pkr->pk->user_id) /* selected by user ID */
+        mdc = pkr->pk->user_id->flags.mdc;
+      else
+        mdc = pkr->pk->mdc_feature;
+      if (!mdc)
+        log_info (_("Note: key %s has no %s feature\n"),
+                  keystr_from_pk (pkr->pk), "MDC");
+    }
+}
+
+void
+warn_missing_aes_from_pklist (PK_LIST pk_list)
+{
+  PK_LIST pkr;
+  for (pkr = pk_list; pkr; pkr = pkr->next) 
+    {
+      const prefitem_t *prefs;
+      int i;
+      int gotit = 0;
+
+      prefs = pkr->pk->user_id? pkr->pk->user_id->prefs : pkr->pk->prefs;
+      if (prefs)
+        {
+          for (i=0; !gotit && prefs[i].type; i++ )
+            if (prefs[i].type == PREFTYPE_SYM 
+                && prefs[i].value == CIPHER_ALGO_AES)
+              gotit++;
+       }
+      if (!gotit)
+        log_info (_("Note: key %s has no preference for %s\n"),
+                  keystr_from_pk (pkr->pk), "AES");
     }
-    return 1; /* can be used */
 }