tests: Add sample secret key w/o binding signatures.

--

GnuPG-bug-id: 4392

tests/openpgp/samplekeys/README

@@ -14,8 +14,18 @@ whats-new-in-2.1.asc   Collection of sample keys.
 e2e-p256-1-clr.asc     Google End-end-End test key (no protection)
 e2e-p256-1-prt.asc     Ditto, but protected with passphrase "a".
 E657FB607BB4F21C90BB6651BC067AF28BC90111.asc Key with subkeys (no protection)
+pgp-desktop-skr.asc    Secret key with subkeys w/o signatures
 rsa-rsa-sample-1.asc   RSA+RSA sample key (no passphrase)
 ed25519-cv25519-sample-1.asc  Ed25519+CV25519 sample key (no passphrase)
 silent-running.asc     Collection of sample secret keys (no passphrases)
 rsa-primary-auth-only.pub.asc  rsa2408 primary only, usage: cert,auth
 rsa-primary-auth-only.sec.asc  Ditto but the secret keyblock.
+
+
+Notes:
+
+- pgp-desktop-skr.asc is a secret keyblock without the uid and subkey
+  binding signatures.  When exporting a secret key from PGP desktop
+  such a file is created which is then directly followed by a separate
+  armored public key block.  To create such a sample concatenate
+  pgp-desktop-skr.asc and E657FB607BB4F21C90BB6651BC067AF28BC90111.asc

tests/openpgp/samplekeys/pgp-desktop-skr.asc

@@ -0,0 +1,56 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: Made up as if from PGP Encryption Desktop 10.3.2
+
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+OeRRvDotcfiTGKBc
+=VlTT
+-----END PGP PRIVATE KEY BLOCK-----