## GnuPG application: blue-app-gnupg GnuPG application for Ledger Blue and Nano S 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 . The application supports: - RSA with key up to 4096 bits - ECDSA with secp256k1, secp256r1, brainpool 256r1 and brainpool 256t1 curves - EDDSA with Ed25519 curve - ECDH with secp256k1, secp256r1, brainpool 256r1, brainpool 256t1 and curve25519 curves To compile it, use at least the Nano S SDK 1.3.1.4 on firmware 1.3.1 This release is in beta stage with known missing parts (see also Add-on) : * Ledger Blue support * Seed mode ON/OFF via apdu ## Add-on The GnuPG application implements the following addon: - serial modification - on screen reset - 3 independent key slots - seeded key generation Technical specification is available in doc/gpgcard3.0-addon.rst ### 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. More details to come... ### On screen reset The application can be reset as if it was fresh installed. In settings, choose reset and confirm.