Notes GPG - Two cards with same subkeys

GPG - carte a puce - utiliser plusieurs cartes avec les mêmes clefs secrètes

Voir :

• Using multiple OpenPGP Smart Cards with the same secret keys

Backup GPG cards

Voir :

• https://security.stackexchange.com/questions/165286/how-to-use-multiple-smart-cards-with-gnupg

Pb - Error Please insert card with serial number 0001 12345678

$ diff .gnupg.nitrokey/private-keys-v1.d/AF710C976166A34B065DAF48430F30FEE69DA9D9.key .gnupg.yubykey/private-keys-v1.d/AF710C976166A34B065DAF48430F30FEE69DA9D9.key
6c6
<   (#D27600012401030400050000A44B0000# OPENPGP.1))))
---
>   (#D2760001240103040006142373880000# OPENPGP.1))))

$ diff .gnupg.nitrokey/private-keys-v1.d/C98A50CAD33BE20FCC23425F9FAA782B5195A9D2.key .gnupg.yubykey/private-keys-v1.d/C98A50CAD33BE20FCC23425F9FAA782B5195A9D2.key 
6c6
<   (#D27600012401030400050000A44B0000# OPENPGP.2))))
---
>   (#D2760001240103040006142373880000# OPENPGP.2))))

$ gpg --card-status  |grep 'card-no'
                                          card-no: 0006 14237388
                                          card-no: 0006 14237388

$ gpg --card-status |grep "^Application ID"
Application ID ...: D27600012401030400050000A44B0000

$ opensc-tool -l 
# Detected readers (pcsc)
Nr.  Card  Features  Name
0    Yes             Nitrokey Nitrokey Pro (00000000000000000000A44B) 00 00

D276000124010304 00050000A44B0000
D276000124010304 + '0006 14237388' + '0000'
D2760001240103040006142373880000

Voici comment trouver ce numéro

$ opensc-explorer 
OpenSC Explorer version 0.21.0
Using reader with a card: Nitrokey Nitrokey Pro (00000000000000000000A44B) 00 00
OpenSC [3F00]> ls
FileID  Type  Size
 004F    wEF    16
 005E    wEF    19
[0065]    DF    32
[006E]    DF   244
[007A]    DF     5
 00C4    wEF     7
 0101    wEF     0
 0102    wEF     0
 0103    wEF     0
 0104    wEF     0
 5F50    wEF     0
 5F52    wEF    10
 7F21    wEF     0
[A400]    DF     0
 A401    wEF     0
[B600]    DF   136
 B601    wEF   158
[B800]    DF   136
 B801    wEF   158
OpenSC [3F00]> cat 004F
00000000: D2 76 00 01 24 01 03 04 00 05 00 00 A4 4B 00 00 .v..$........K..

Seulement voilà cette manip ne fonctionne pas la Yubikey

$ openpgp-tool -C
Using reader with a card: Yubico YubiKey OTP+FIDO+CCID 00 00
AID:             d2:76:00:01:24:01:03:04:00:06:14:23:73:88:00:00
Version:         3.4
Manufacturer:    Yubico
Serial number:   14237388

$ opensc-tool --atr 
Using reader with a card: Yubico YubiKey OTP+FIDO+CCID 00 00
3b:fd:13:00:00:81:31:fe:15:80:73:c0:21:c0:57:59:75:62:69:4b:65:79:40

$ opensc-tool -a -v
Using reader with a card: Yubico YubiKey OTP+FIDO+CCID 00 00
Card ATR:
3B FD 13 00 00 81 31 FE 15 80 73 C0 21 C0 57 59 ;.....1...s.!.WY
75 62 69 4B 65 79 40                            ubiKey@

La commande ci dessous ne fonctionne pas, ce n'est pas la bonne clef

$ gpg ~/tmp/plop.txt.gpg 
Please insert the card with serial number: 0005 0000BD62

Mais où est donc (ornicar ?) l'id 0000BD62 ?

$ rgrep 0000BD62 ~/.gnupg
~/.gnupg/private-keys-v1.d/F66AA9329AEA6F09D69DD852BF8233DE68119AF5.key:Token: D27600012401030400050000BD620000 OPENPGP.3 - 0005+0000BD62
~/.gnupg/private-keys-v1.d/F66AA9329AEA6F09D69DD852BF8233DE68119AF5.key:  (#D27600012401030400050000BD620000# OPENPGP.3))))
~/.gnupg/private-keys-v1.d/3F5417680639FCEF05C54803B408B83BA496E964.key:Token: D27600012401030400050000BD620000 OPENPGP.1 - 0005+0000BD62
~/.gnupg/private-keys-v1.d/3F5417680639FCEF05C54803B408B83BA496E964.key:  (#D27600012401030400050000BD620000# OPENPGP.1))))
~/.gnupg/private-keys-v1.d/DC81057888D07B12268226B9F136013C4D32566D.key:Token: D27600012401030400050000BD620000 OPENPGP.2 - 0005+0000BD62
~/.gnupg/private-keys-v1.d/DC81057888D07B12268226B9F136013C4D32566D.key:  (#D27600012401030400050000BD620000# OPENPGP.2))))

Trouver l'id la clef actuelle

$ gpg --card-status |grep "^Application ID"
Application ID ...: D2760001240103040006142373880000

On remplace l'ancien id par le nouveau

cp -a ~/.gnupg ~/.gnupg.bak
sed -i -e 's/D27600012401030400050000BD620000/D2760001240103040006142373880000/g' ~/.gnupg/private-keys-v1.d/*.key

Ça fonctionne

gpg ~/tmp/plop.txt.gpg

Export / Import

python3 -m gpgcard.gpgcli --backup --pinpad --backup-keys --file gpg-key.pickle
 
python3 -m gpgcard.gpgcli --restore --pinpad --file gpg-key.pickle