gpg: Add option to print fingerprints in ICAO spelling.

* g10/gpg.c: Add option --with-icao-spelling.
* g10/options.h (struct opt): Add with_icao_spelling.
* g10/keylist.c (print_icao_hexdigit): New.
(print_fingerprint): Print ICAO spelling.

Signed-off-by: Werner Koch <wk@gnupg.org>

doc/gpg.texi

@@ -2136,6 +2136,11 @@ Same as the command @option{--fingerprint} but changes only the format
 of the output and may be used together with another command.
 
 @ifset gpgtwoone
+
+@item --with-icao-spelling
+@opindex with-icao-spelling
+Print the ICAO spelling of the fingerprint in addition to the hex digits.
+
 @item --with-keygrip
 @opindex with-keygrip
 Include the keygrip in the key listings.

g10/gpg.c

@@ -176,6 +176,7 @@ enum cmd_and_opt_values
     oNoAskCertLevel,
     oFingerprint,
     oWithFingerprint,
+    oWithICAOSpelling,
     oWithKeygrip,
     oWithSecret,
     oAnswerYes,
@@ -692,6 +693,7 @@ static ARGPARSE_OPTS opts[] = {
   ARGPARSE_s_n (oUtf8Strings,      "utf8-strings", "@"),
   ARGPARSE_s_n (oNoUtf8Strings, "no-utf8-strings", "@"),
   ARGPARSE_s_n (oWithFingerprint, "with-fingerprint", "@"),
+  ARGPARSE_s_n (oWithICAOSpelling, "with-icao-spelling", "@"),
   ARGPARSE_s_n (oWithKeygrip,     "with-keygrip", "@"),
   ARGPARSE_s_n (oWithSecret,      "with-secret", "@"),
   ARGPARSE_s_s (oDisableCipherAlgo,  "disable-cipher-algo", "@"),
@@ -2421,6 +2423,9 @@ main (int argc, char **argv)
             opt.with_fingerprint = 1;
             opt.fingerprint++;
             break;
+	  case oWithICAOSpelling:
+            opt.with_icao_spelling = 1;
+            break;
 	  case oFingerprint:
             opt.fingerprint++;
             fpr_maybe_cmd = 1;

g10/keylist.c

@@ -1580,6 +1580,20 @@ list_keyblock (KBNODE keyblock, int secret, int has_secret, int fpr,
     es_fflush (es_stdout);
 }
 
+
+/* Print an hex digit in ICAO spelling.  */
+static void
+print_icao_hexdigit (estream_t fp, int c)
+{
+  static const char *list[16] = {
+    "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven",
+    "Eight", "Niner", "Alfa", "Bravo", "Charlie", "Delta", "Echo", "Foxtrot"
+  };
+
+  tty_fprintf (fp, "%s", list[c&15]);
+}
+
+
 /*
  * Function to print the finperprint.
  * mode 0: as used in key listings, opt.with_colons is honored
@@ -1675,6 +1689,26 @@ print_fingerprint (estream_t override_fp, PKT_public_key *pk, int mode)
 	}
     }
   tty_fprintf (fp, "\n");
+  if (!opt.with_colons && opt.with_icao_spelling)
+    {
+      p = array;
+      tty_fprintf (fp, "%*s\"", (int)strlen(text)+1, "");
+      for (i = 0; i < n; i++, p++)
+        {
+          if (!i)
+            ;
+          else if (!(i%4))
+            tty_fprintf (fp, "\n%*s ", (int)strlen(text)+1, "");
+          else if (!(i%2))
+            tty_fprintf (fp, "  ");
+          else
+            tty_fprintf (fp, " ");
+          print_icao_hexdigit (fp, *p >> 4);
+          tty_fprintf (fp, " ");
+          print_icao_hexdigit (fp, *p & 15);
+        }
+      tty_fprintf (fp, "\"\n");
+    }
 }
 
 /* Print the serial number of an OpenPGP card if available.  */

g10/options.h

@@ -67,6 +67,7 @@ struct
   int check_sigs; /* check key signatures */
   int with_colons;
   int with_key_data;
+  int with_icao_spelling; /* Print ICAO spelling with fingerprints.  */
   int with_fingerprint; /* Option --with-fingerprint active.  */
   int with_keygrip;     /* Option --with-keygrip active.  */
   int with_secret;      /* Option --with-secret active.  */