tests/fake-pinentries: fake pinentries for downstream developers.

* tests/fake-pinentries/README.txt and
  tests/fake-pinentries/fake-pinentry.{sh,py,pl,php}}: New public
  domain (CC0) files to encourage better test suite practices from
  downstream developers.
* tests/fake-pinentries/COPYING (new): a copy of
  https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

tests/fake-pinentries/COPYING

@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
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tests/fake-pinentries/README.txt

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+Fake Pinentries for Test Suites
+===============================
+
+If you're writing a test suite, it should use one of these pinentries
+by setting the following line in $GNUPGHOME/gpg-agent.conf:
+
+    pinentry-program /path/to/fake-pinentry.ext
+
+Note that different fake-pinentry programs have been supplied here in
+different languages, with the intent of making them available to
+developers who have different languages available.
+
+They are all licensed Creative Commons Zero (CC0-1.0-Universal, see
+the COPYING file in this directory), so they should be reusable by any
+project.  Feel free to copy them into your own project's test suite.
+
+Rationale
+---------
+
+If you're implementing software that uses GnuPG, you probably want a
+test suite that exercises your code, and you may have some that
+involve secret key material locked with a passphrase.  However, you
+don't want to require your developers to manually enter a passphrase
+while tests are run, and you probably also don't want to deal with
+alternate codepaths/workflows like using gpg's loopback pinentry.
+
+The solution for this is to use a fake pinentry in your test suite,
+one that simply returns a pre-selected passphrase.  In this case, all
+the other code follows the same path as normal, but the user
+interaction is bypassed because the fake-pinentry is used instead.
+
+Troubleshooting
+---------------
+
+If you have any trouble with this technique, please drop a line to the
+GnuPG development mailing list <gnupg-devel@gnupg.org> or open a
+report on the GnuPG bug tracker at https://bugs.gnupg.org/gnupg

tests/fake-pinentries/fake-pinentry.php

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+#!/usr/bin/php
+<?php
+# Use this for your test suites when a PHP interpreter is available.
+#
+# The encrypted keys in your test suite that you expect to work must
+# be locked with a passphrase of "passphrase"
+#
+# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+#
+# License: Creative Commons Zero ("Public Domain Dedication") --
+# Anyone may reuse it, modify it, redistribute it for any purpose.
+
+print("OK This is only for test suites, and should never be used in production\n");
+while (true) {
+    $line = fgets(STDIN);
+    if (False === $line)
+        break;
+    $line = strtolower(trim($line));
+    if (($line === "") || ($line[0] == '#'))
+        continue;
+    if ((0 === strncmp("getpin", $line, 6)))
+        print("D passphrase\n");
+    print("OK\n");
+    if ((0 === strncmp("bye", $line, 3)))
+        break;
+}
+?>

tests/fake-pinentries/fake-pinentry.pl

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+#!/usr/bin/perl -w
+# Use this for your test suites when a perl interpreter is available.
+#
+# The encrypted keys in your test suite that you expect to work must
+# be locked with a passphrase of "passphrase"
+#
+# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+#
+# License: Creative Commons Zero ("Public Domain Dedication") --
+# Anyone may reuse it, modify it, redistribute it for any purpose.
+
+use strict;
+use warnings;
+
+# turn off buffering
+$| = 1;
+
+print "OK This is only for test suites, and should never be used in production\n";
+while (<STDIN>) {
+  chomp;
+  next if (/^$/);
+  next if (/^#/);
+  print ("D passphrase\n") if (/^getpin/i);
+  print "OK\n";
+  exit if (/^bye/i);
+}
+1;

tests/fake-pinentries/fake-pinentry.py

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+#!/usr/bin/env python
+# Use this for your test suites when a python interpreter is available.
+#
+# The encrypted keys in your test suite that you expect to work must
+# be locked with a passphrase of "passphrase"
+#
+# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+#
+# License: Creative Commons Zero ("Public Domain Dedication") --
+# Anyone may reuse it, modify it, redistribute it for any purpose.
+
+import sys, os
+
+# turn off buffering:
+sys.stdin = os.fdopen(sys.stdin.fileno(), 'r', 0)
+sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
+
+print("OK This is only for test suites, and should never be used in production")
+while True:
+    ln = sys.stdin.readline()
+    if (ln == ''):
+        break
+    ln = ln.lower()
+    if (ln.strip() == '') or (ln.startswith('#')):
+        continue
+    if (ln.startswith('getpin')):
+        sys.stdout.write('D passphrase\n')
+    sys.stdout.write('OK\n')
+    if (ln.startswith('bye')):
+        break

tests/fake-pinentries/fake-pinentry.sh

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+#!/bin/sh
+# Use this for your test suites when a POSIX shell is available.
+#
+# The encrypted keys in your test suite that you expect to work must
+# be locked with a passphrase of "passphrase"
+#
+# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+#
+# License: Creative Commons Zero ("Public Domain Dedication") --
+# Anyone may reuse it, modify it, redistribute it for any purpose.
+
+echo "OK This is only for test suites, and should never be used in production"
+while read cmd rest; do
+    cmd=$(printf "%s" "$cmd" | tr 'A-Z' 'a-z')
+    if [ -z "$cmd" ]; then
+        continue;
+    fi
+    case "$cmd" in
+        \#*)
+        ;;
+        getpin)
+            echo "D passphrase"
+            echo "OK"
+            ;;
+        bye)
+            echo "OK"
+            exit 0
+            ;;
+        *)
+            echo "OK"
+            ;;
+    esac
+done