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Fix RSA mentions in USAGE.md #95

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Nov 22, 2022
Merged

Fix RSA mentions in USAGE.md #95

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a8e4177
Fix RSA mentions in USAGE.md
sosthene-nitrokey Nov 22, 2022
91efb26
Fix Rsa -> RSA
sosthene-nitrokey Nov 22, 2022
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23 changes: 20 additions & 3 deletions USAGE.md
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ Plug your Nitrokey 3A Mini and use [nitropy](https://docs.nitrokey.com/software/

## Generating keys

Currently, Opcard only supports curve25519 and P-256 curves.
OPcard supports Rsa 2048 and 4096 bits, P-256, X25519 ad Ed25519.
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It's "RSA"

To edit the card, run `gpg --edit-card --expert` (`--expert` is required for P-256).
GPG should show you information about the card:

Expand Down Expand Up @@ -51,7 +51,7 @@ General key info..: [none]
```

Enable administration commands with `admin` and edit the key types with `key-attr`.
Select `ECC` (`RSA` support is coming soon) and then choose either `Curve 25519` or `NIST P-256`.
You can then select `ECC` and choose either `Curve 25519` or `NIST P-256`.

```
gpg/card> admin
Expand All @@ -75,6 +75,23 @@ Please select which elliptic curve you want:
Your selection? 1
```

You can also select `RSA` and keys of size 2048 or 4096.
While opcard supports 4096 bit keys, in practice key generation is extremely slow is therefore disable in the compiled firmware.
You can however still import RSA 4096 bit keys that were generated off-device.

```
gpg/card> admin
Admin commands are allowed

gpg/card> key-attr
Changing card key attribute for: Signature key
Please select what kind of key you want:
(1) RSA
(2) ECC
Your selection? 1
What keysize do you want? (2048) 2048
```

The card will prompt you for the admin password (`12345678` by default).
Continue for all three key types (signature, decryption and authentication).

Expand Down Expand Up @@ -116,7 +133,7 @@ public and secret key created and signed.
⚠️ Opcard being alpha software, we do not guarantee that future updates will not lead to data loss. If you import a key to the card, we recommand you also keep a backup with `gpg --export-secret-keys <key email>` and `gpg --export-secret-subkeys <key email>`.


If you already have curve25519 or P-256 PGP keys, you should be able to import them using `gpg --edit-key <key email>` and then `keytocard` (**this will delete your key from your computer!**) will move the signing key.
If you already have PGP keys, you should be able to import them using `gpg --edit-key <key email>` and then `keytocard` (**this will delete your key from your computer!**) will move the signing key.
Continue with `key 1` to select the encryption subkey and repeat `keytocard` to move it too.

## Changing the PIN
Expand Down