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import {
PaytoUri,
TalerSignaturePurpose,
bufferForUint32,
buildSigPS,
createEddsaKeyPair,
decodeCrock,
decryptWithDerivedKey,
eddsaGetPublic,
eddsaSign,
encodeCrock,
encryptWithDerivedKey,
getRandomBytesF,
stringToBytes,
stringifyPaytoUri,
} from "@gnu-taler/taler-util";
import { AmlExchangeBackend } from "./types.js";
export interface Account {
accountId: AccountId;
signingKey: SigningKey;
}
/**
* 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 unlockAccount(
account: LockedAccount,
password: string,
): Promise<Account> {
const rawKey = decodeCrock(account);
const rawPassword = stringToBytes(password);
const signingKey = (await decryptWithDerivedKey(
rawKey,
rawPassword,
password,
).catch((e: Error) => {
throw new UnwrapKeyError(e.message);
})) as SigningKey;
const publicKey = eddsaGetPublic(signingKey);
const accountId = encodeCrock(publicKey) as AccountId;
return { accountId, signingKey };
}
export function buildQuerySignature(key: SigningKey): string {
const sigBlob = buildSigPS(
TalerSignaturePurpose.TALER_SIGNATURE_AML_QUERY,
).build();
return encodeCrock(eddsaSign(sigBlob, key));
}
export function buildDecisionSignature(
key: SigningKey,
payto: PaytoUri,
state: AmlExchangeBackend.AmlState,
): string {
const sigBlob = buildSigPS(TalerSignaturePurpose.TALER_SIGNATURE_AML_DECISION)
.put(decodeCrock(stringifyPaytoUri(payto)))
.put(bufferForUint32(state))
.build();
return encodeCrock(eddsaSign(sigBlob, key));
}
declare const opaque_Account: unique symbol;
export type LockedAccount = string & { [opaque_Account]: true };
declare const opaque_AccountId: unique symbol;
export type AccountId = string & { [opaque_AccountId]: true };
declare const opaque_SigningKey: unique symbol;
export type SigningKey = Uint8Array & { [opaque_SigningKey]: true };
/**
* Create new account (secured private key)
* secured with the given password
*
* @param sessionId
* @param password
* @returns
*/
export async function createNewAccount(
password: string,
): Promise<Account & { safe: LockedAccount }> {
const { eddsaPriv, eddsaPub } = createEddsaKeyPair();
const key = stringToBytes(password);
const protectedPrivKey = await encryptWithDerivedKey(
getRandomBytesF(24),
key,
eddsaPriv,
password,
);
const signingKey = eddsaPriv as SigningKey;
const accountId = encodeCrock(eddsaPub) as AccountId;
const safe = encodeCrock(protectedPrivKey) as LockedAccount;
return { 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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