detached signatures are working

5 files changed, 82 insertions, 8 deletions

diff --git a/g10/g10.c b/g10/g10.c
index 345ccd5ae..747cba196 100644
--- a/g10/g10.c
+++ b/g10/g10.c
@@ -66,7 +66,7 @@ strusage( int level )
   #endif
   #ifdef HAVE_RSA_CIPHER
     "WARNING: This version has RSA support! Your are not allowed to\n"
-    "         use it inside the Unites States until Sep 30, 2000!\n"
+    "         use it inside the Unites States before Sep 30, 2000!\n"
   #endif
 	;
 	break;
diff --git a/g10/getkey.c b/g10/getkey.c
index c978cb9fd..c7ea1686a 100644
--- a/g10/getkey.c
+++ b/g10/getkey.c
@@ -275,6 +275,7 @@ get_seckey( PKT_secret_cert *skc, u32 *keyid )
 
 /****************
  * Get a secret key by name and store it into skc
+ * If NAME is NULL use the default certificate
  */
 int
 get_seckey_by_name( PKT_secret_cert *skc, const char *name )
@@ -432,8 +433,12 @@ scan_secret_keyring( PKT_secret_cert *skc, u32 *keyid,
     int save_mode;
     u32 akeyid[2];
     PKT_secret_cert *last_pk = NULL;
+    int get_first;
+    u32 dummy_keyid[2];
 
-    assert( !keyid || !name );
+    get_first = !keyid && !name;
+    if( get_first )
+	keyid = dummy_keyid;
 
     if( !(a = iobuf_open( filename ) ) ) {
 	log_debug("scan_secret_keyring: can't open '%s'\n", filename );
@@ -453,11 +458,17 @@ scan_secret_keyring( PKT_secret_cert *skc, u32 *keyid,
 	    switch( pkt.pkt.secret_cert->pubkey_algo ) {
 	      case PUBKEY_ALGO_ELGAMAL:
 	      case PUBKEY_ALGO_RSA:
-		keyid_from_skc( pkt.pkt.secret_cert, akeyid );
-		if( akeyid[0] == keyid[0] && akeyid[1] == keyid[1] ) {
+		if( get_first ) {
 		    copy_secret_cert( skc, pkt.pkt.secret_cert );
 		    found++;
 		}
+		else {
+		    keyid_from_skc( pkt.pkt.secret_cert, akeyid );
+		    if( (akeyid[0] == keyid[0] && akeyid[1] == keyid[1]) ) {
+			copy_secret_cert( skc, pkt.pkt.secret_cert );
+			found++;
+		    }
+		}
 		break;
 	      default:
 		log_error("cannot handle pubkey algo %d\n",
diff --git a/g10/mainproc.c b/g10/mainproc.c
index 8004c3803..9418da4e4 100644
--- a/g10/mainproc.c
+++ b/g10/mainproc.c
@@ -67,6 +67,7 @@ typedef struct {
     int last_was_pubkey_enc;
     int opt_list;
     NODE cert;	   /* the current certificate */
+    int have_data;
 } *CTX;
 
 
@@ -152,8 +153,9 @@ release_cert( CTX c )
 static int
 add_onepass_sig( CTX c, PACKET *pkt )
 {
+    NODE node;
+
     if( c->cert ) { /* add another packet */
-	NODE node;
 
 	if( c->cert->pkt->pkttype != PKT_ONEPASS_SIG ) {
 	   log_error("add_onepass_sig: another packet is in the way\n");
@@ -164,7 +166,8 @@ add_onepass_sig( CTX c, PACKET *pkt )
 	c->cert = node;
     }
     else /* insert the first one */
-	c->cert = new_node( pkt );
+	c->cert = node = new_node( pkt );
+
     return 1;
 }
 
@@ -338,6 +341,8 @@ proc_plaintext( CTX c, PACKET *pkt )
 
     printf("txt: plain text data name='%.*s'\n", pt->namelen, pt->name);
     free_md_filter_context( &c->mfx );
+    /* fixme: take the digest algo to use from the
+     * onpass_sig packet (if we have these) */
     c->mfx.md = md_open(DIGEST_ALGO_RMD160, 0);
     result = handle_plaintext( pt, &c->mfx );
     if( !result )
@@ -393,8 +398,9 @@ do_check_sig( CTX c, NODE node )
     if( (rc=md_okay(algo)) )
 	return rc;
 
-    if( sig->sig_class == 0x00 )
+    if( sig->sig_class == 0x00 ) {
 	md = md_copy( c->mfx.md );
+    }
     else if( (sig->sig_class&~3) == 0x10 ) { /* classes 0x10 .. 0x13 */
 	if( c->cert->pkt->pkttype == PKT_PUBLIC_CERT ) {
 	    NODE n1 = find_parent( c->cert, node );
@@ -568,6 +574,9 @@ proc_packets( IOBUF a )
 	  case PKT_ONEPASS_SIG: newpkt = add_onepass_sig( c, pkt ); break;
 	  default: newpkt = 0; break;
 	}
+	if( pkt->pkttype != PKT_SIGNATURE )
+	    c->have_data = pkt->pkttype == PKT_PLAINTEXT;
+
 	if( newpkt == -1 )
 	    ;
 	else if( newpkt ) {
@@ -615,7 +624,19 @@ proc_tree( CTX c, NODE node )
 	    log_error("proc_tree: onepass_sig without followin data\n");
 	else if( node->child->pkt->pkttype != PKT_SIGNATURE )
 	    log_error("proc_tree: onepass_sig not followed by signature\n");
-	else {	/* check all signature */
+	else {	/* check all signatures */
+	    if( !c->have_data ) {
+		free_md_filter_context( &c->mfx );
+		/* fixme: take the digest algo to use from the
+		 * onepass_sig packet (if we have these) */
+		c->mfx.md = md_open(DIGEST_ALGO_RMD160, 0);
+		rc = ask_for_detached_datafile( &c->mfx );
+		if( rc ) {
+		    log_error("can't hash datafile: %s\n", g10_errstr(rc));
+		    return;
+		}
+	    }
+
 	    for(n1=node->child; n1; n1 = n1->next ) {
 		PKT_signature *sig = n1->pkt->pkt.signature;
 
diff --git a/g10/packet.h b/g10/packet.h
index 63626307e..5694c8a5b 100644
--- a/g10/packet.h
+++ b/g10/packet.h
@@ -251,6 +251,7 @@ int encrypt_data( PKT_encrypted *ed, DEK *dek );
 
 /*-- plaintext.c --*/
 int handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx );
+int ask_for_detached_datafile( md_filter_context_t *mfx );
 
 /*-- comment.c --*/
 int write_comment( IOBUF out, const char *s );
diff --git a/g10/plaintext.c b/g10/plaintext.c
index d317fd789..edd12891c 100644
--- a/g10/plaintext.c
+++ b/g10/plaintext.c
@@ -82,6 +82,8 @@ handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx )
 		rc = G10ERR_READ_FILE;
 		goto leave;
 	    }
+	    if( mfx->md )
+		md_putchar(mfx->md, c );
 	    if( mfx->rmd160 )
 		rmd160_putchar(mfx->rmd160, c );
 	    if( mfx->md5 )
@@ -124,3 +126,42 @@ handle_plaintext( PKT_plaintext *pt, md_filter_context_t *mfx )
     return rc;
 }
 
+
+/****************
+ * Ask for the detached datafile and calculate the digest from it.
+ */
+int
+ask_for_detached_datafile( md_filter_context_t *mfx )
+{
+    char *answer;
+    FILE *fp;
+    int rc = 0;
+    int c;
+
+    tty_printf("Detached signature.\n");
+    answer = tty_get("Please enter name of data file: ");
+    tty_kill_prompt();
+
+    fp = fopen(answer,"rb");
+    if( !fp ) {
+	log_error("can't open '%s': %s\n", answer, strerror(errno) );
+	rc = G10ERR_READ_FILE;
+	goto leave;
+    }
+
+    while( (c = getc(fp)) != EOF ) {
+	if( mfx->md )
+	    md_putchar(mfx->md, c );
+	if( mfx->rmd160 )
+	    rmd160_putchar(mfx->rmd160, c );
+	if( mfx->md5 )
+	    md5_putchar(mfx->md5, c );
+    }
+    fclose(fp);
+
+  leave:
+    m_free(answer);
+    return rc;
+}
+
+