[PATCH] Display notifications in key signatures

[Matthew Byng-Maddick]

I have been involved with a project which will probably want to use
notifications (as per RFC2440 5.2.3.15). I note that GnuPG will sign with
these, but currently will only display them if you do a --list-packets on
the public keyring.

The attached patch (against gnupg-1.0.6) will display them as part of the
signature.
---8<---
diff -uNr g10/keylist.c.old g10/keylist.c
--- g10/keylist.c.old	Sun May 27 15:31:07 2001
+++ g10/keylist.c	Tue Jul 31 11:58:40 2001
@@ -39,6 +39,7 @@
 static void list_one( STRLIST names, int secret);
 static void list_keyblock( KBNODE keyblock, int secret );
 static void fingerprint( PKT_public_key *pk, PKT_secret_key *sk );
+static void sig_pkt_note( PKT_signature *sig, int with_colon );
 
 
 /****************
@@ -363,6 +364,7 @@
 		m_free(p);
 	    }
 	    putchar('\n');
+	    sig_pkt_note(sig,0);
 	    /* fixme: check or list other sigs here */
 	}
     }
@@ -640,6 +642,7 @@
 		m_free(p);
 	    }
             printf(":%02x%c:\n", sig->sig_class, get_lsign_letter (sig) );
+	    sig_pkt_note(sig,1);
 	    /* fixme: check or list other sigs here */
 	}
     }
@@ -648,6 +651,85 @@
         putchar(':');
         print_capabilities (pk, sk, keyblock);
 	putchar('\n');
+    }
+}
+
+static void
+sig_pkt_note(PKT_signature *sig, int with_colon)
+{
+    const byte *buf;
+    size_t size;
+
+    buf=parse_sig_subpkt2(sig, SIGSUBPKT_NOTATION, &size);
+    if(buf) {
+	const byte *s = buf, *t;
+	size_t n1,n1o,n2;
+
+	if(with_colon)
+	    printf("not:");
+	else {
+	    for(n1=0;n1<32;n1++)
+		putchar(' ');
+	    printf("[notation] ");
+	}
+
+	if(size<8) {
+	    if(with_colon)
+		printf("%%::::::");
+	    else
+		printf("[too short]");
+	} else {
+	    n1 = (s[4] << 8) | s[5];
+	    n2 = (s[6] << 8) | s[7];
+	    if(size != (8 + n1 + n2)) {
+		if(with_colon)
+		    printf("-::::::");
+		else
+		    printf("[length mismatch]");
+	    } else {
+		char human_readable;
+
+		human_readable=(!(*buf & 0x80))?'x':'t';
+		s+=8;
+
+		if(with_colon) {
+		printf("!:%d%c:%d%c:",n1,human_readable,n2,human_readable);
+
+		t=s;
+
+		n1o=n1;
+		while(n1--) {
+		    if(human_readable=='t')
+			putchar(*t++);
+		    else
+			printf("%02X",*t++);
+		}
+		putchar(':');
+		t=s+n1o;
+		while(n2--) {
+		    if(human_readable=='t')
+			putchar(*t++);
+		    else
+			printf("%02X",*t++);
+		}
+
+		printf(":\n");
+		} else if(human_readable=='t') {
+		    t=s;
+
+		    n1o = n1;
+		    while(n1--)
+			putchar(*t++);
+		    putchar('=');
+		    t= s + n1o;
+		    while(n2--)
+			putchar(*t++);
+		} else {
+		    printf("[not human readable]");
+		}
+	    }
+	}
+	printf("\n");
     }
 }

---8<---

I couldn't find anything like this in the archives, so I hope this is useful.

Cheers

MBM

-- 
Matthew Byng-Maddick         <mbm at colondot.net>           http://colondot.net/
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