openpgp-card-app/README.md

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## GnuPG application: blue-app-gnupg
GnuPG application for Nano S and Nano X
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This application implements "The OpenPGP card" specification revision 3.0. This specification is available in *doc* directory and at https://g10code.com/p-card.html .
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The application supports:
- RSA with key up to 4096 bits
- ECDSA with secp256k1
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- EDDSA with Ed25519 curve
- ECDH with secp256k1 and curve25519 curves
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This release has known missing parts (see also Add-on) :
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* Ledger Blue support
* Seed mode ON/OFF via apdu
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## Installation and Usage
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See the full doc at https://github.com/LedgerHQ/blue-app-openpgp-card/blob/master/doc/user/blue-app-openpgp-card.pdf
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## Add-on
The GnuPG application implements the following addon:
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- serial modification
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- on screen reset
- 3 independent key slots
- seeded key generation
Technical specification is available at https://github.com/LedgerHQ/blue-app-openpgp-card/blob/master/doc/developper/gpgcard3.0-addon.rst
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### Key slot
"The OpenPGP card" specification specifies:
- 3 asymmetric keys : Signature, Decryption, Authentication
- 1 symmetric key
The blue application allow you to store 3 different key sets, named slot. Each slot contains the above 4 keys.
You can choose the active slot on the main screen.
When installed the default slot is "1". You can change it in settings.
### seeded key generation
A seeded mode is implemented in order to restore private keys on a new token.
In this mode key material is generated from the global token seeded.
Please consider SEED mode as experimental.
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More details to come...
### On screen reset
The application can be reset as if it was fresh installed. In settings, choose reset and confirm.