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/*
This file is part of GNU Taler
(C) 2022-2024 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import {
EncryptionNonce,
LockedAccount,
OfficerAccount,
OfficerId,
SigningKey,
createEddsaKeyPair,
decodeCrock,
decryptWithDerivedKey,
eddsaGetPublic,
encodeCrock,
encryptWithDerivedKey,
getRandomBytesF,
kdf,
stringToBytes,
} from "@gnu-taler/taler-util";
/**
* Restore previous session and unlock account with password
*
* @param salt string from which crypto params will be derived
* @param key secured private key
* @param password password for the private key
* @returns
*/
export async function unlockOfficerAccount(
account: LockedAccount,
password: string,
): Promise<OfficerAccount> {
const rawKey = decodeCrock(account);
const rawPassword = stringToBytes(password);
const signingKey = (await decryptWithDerivedKey(
rawKey,
rawPassword,
password,
).catch((e) => {
throw new UnwrapKeyError(e instanceof Error ? e.message : String(e));
})) as SigningKey;
const publicKey = eddsaGetPublic(signingKey);
const accountId = encodeCrock(publicKey) as OfficerId;
return { id: accountId, signingKey };
}
/**
* Create new account (secured private key)
* secured with the given password
*
* @param sessionId
* @param password
* @returns
*/
export async function createNewOfficerAccount(
password: string,
extraNonce: EncryptionNonce,
): Promise<OfficerAccount & { safe: LockedAccount }> {
const { eddsaPriv, eddsaPub } = createEddsaKeyPair();
const key = stringToBytes(password);
const localRnd = getRandomBytesF(24);
const mergedRnd: EncryptionNonce = extraNonce
? kdf(24, stringToBytes("aml-officer"), extraNonce, localRnd)
: localRnd;
const protectedPrivKey = await encryptWithDerivedKey(
mergedRnd,
key,
eddsaPriv,
password,
);
const signingKey = eddsaPriv as SigningKey;
const accountId = encodeCrock(eddsaPub) as OfficerId;
const safe = encodeCrock(protectedPrivKey) as LockedAccount;
return { id: accountId, signingKey, safe };
}
export class UnwrapKeyError extends Error {
public cause: string;
constructor(cause: string) {
super(`Recovering private key failed on: ${cause}`);
this.cause = cause;
}
}
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