Allow the user to restore only one key to the Nano

This PR allows the user to restore only one key, for example only
the authentication key.

Some minor improvements to the doc. is also included.

doc/user/blue-app-openpgp-card.rst

@@ -103,15 +103,17 @@ Refer to the SDK documentation for the compiling/loading...
 System Configuration
 --------------------
 
-For Linux and MAC, until version 1.4.27, Ledger CCID interface is not supported 
-by default by pcscd and must be manually added 
+You need to install CCID.
+For Linux and MAC, the Ledger NanoS CCID interface is not supported
+by default by pcscd and must be manually added for CCID versions earlier than 1.4.28.
+The support of the NanoX is expected to be released as part of the upcoming version 1.4.32.
 
-For windows....
+For Windows....
 
 Linux
 ~~~~~
 
-You have to have to add the NanoS to /etc/libccid_Info.plist
+If you are using an old version of CCID, you have to have to add the NanoS to /etc/libccid_Info.plist
 
    - In  <key>ifdVendorID</key>      add the entry  <string>0x2C97</string>
    - In  <key>ifdProductID</key>     add the entry  <string>0x0001</string>
@@ -119,6 +121,12 @@ You have to have to add the NanoS to /etc/libccid_Info.plist
   
 These 3 entries must be added at the end of each list.
 
+For the NanoX :
+
+   - In  <key>ifdVendorID</key>      add the entry  <string>0x2C97</string>
+   - In  <key>ifdProductID</key>     add the entry  <string>0x0004</string>
+   - In  <key>ifdFriendlyName</key>  add the entry  <string>Ledger Token</string>
+
 MAC
 ~~~
 
@@ -241,8 +249,8 @@ A key template is defined by the OpenGPG card application specification. It
 describes the key to be generated with the ``generate`` command in 
 ``gpg --card-edit``
 
-To set up a new ECC template you have three choices: the NanoS menu, the
-``gpg-connect-agent`` tool and last, the ``gpg --edit-card`` interactive setup.
+To set up a new ECC template you have three choices: the ``gpg --edit-card``
+interactive setup, the ``gpg-connect-agent`` tool and the NanoS menu.
 
 
 **gpg --card-edit** (recommended)
@@ -256,7 +264,7 @@ In a terminal launch :
  | ``gpg/card> admin``
  | ``Admin commands are allowed``
  | ````
- | ``gpg/card> set-key``
+ | ``gpg/card> key-attr``
  | ``Changing card key attribute for: Signature key``
  | ``Please select what kind of key you want:``
  |    ``(1) RSA``
@@ -1279,7 +1287,9 @@ in the the following order ``SC:E:A`` :
 ``2C688345BDDA0EDFB24DB4FB8451AAF7D43D1095:DF157BD4AC3BD1EE991099C80953D871FC4B9EA4:
 CEC59AE6A76614BC3C6D37D9C5A8FB078520ABBB``.
 
+If you only have one key to restore you can omit the others, for example to only restore the authentication key :
 
+``::CEC59AE6A76614BC3C6D37D9C5A8FB078520ABBB``
 
 
 **Step 1: restore**
@@ -1290,7 +1300,7 @@ Finally run the following command :
 
  | ``python3 -m gpgcard.gpgcli --pinpad  --set-template ed255519:cv25519:ed255519 --set-fingerprints ``
  | ``  '2C688345BDDA0EDFB24DB4FB8451AAF7D43D1095:DF157BD4AC3BD1EE991099C80953D871FC4B9EA4:CEC59AE6A76614BC3C6D37D9C5A8FB078520ABBB'``
- | ``  --set-serial 'FD6C11BE' --seed ``
+ | ``  --set-serial 'FD6C11BE' --seed-key ``
 
 
 

pytools/gpgcard/gpgcli.py

@@ -129,7 +129,7 @@ try:
         gpgcard.set_template(templates[sig],templates[dec],templates[aut])
         print("OK", flush=True)
         
-    if (args.seed_key):
+    if args.seed_key:
         print("Seed Key...", end='', flush=True)
         gpgcard.seed_key();
         print("OK", flush=True)        
@@ -137,9 +137,12 @@ try:
     if args.set_fingerprints:
         print("Set fingerprints...", end='', flush=True)
         sig,dec,aut = args.set_fingerprints.split(":")
-        gpgcard.set_key_fingerprints("sig", sig)
-        gpgcard.set_key_fingerprints("dec", dec)
-        gpgcard.set_key_fingerprints("aut", aut)
+        if sig:
+            gpgcard.set_key_fingerprints("sig", sig)
+        if dec:
+            gpgcard.set_key_fingerprints("dec", dec)
+        if aut:
+            gpgcard.set_key_fingerprints("aut", aut)
         print("OK", flush=True)
 
     if args.set_serial: