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wallet.ts
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wallet.ts
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import {
Argon2id,
isArgon2idOptions,
Random,
xchacha20NonceLength,
Xchacha20poly1305Ietf,
} from "@cosmjs/crypto";
import { toAscii } from "@cosmjs/encoding";
/**
* A fixed salt is chosen to archive a deterministic password to key derivation.
* This reduces the scope of a potential rainbow attack to all CosmJS users.
* Must be 16 bytes due to implementation limitations.
*/
export const cosmjsSalt = toAscii("The CosmJS salt.");
export interface KdfConfiguration {
/**
* An algorithm identifier, such as "argon2id" or "scrypt".
*/
readonly algorithm: string;
/** A map of algorithm-specific parameters */
readonly params: Record<string, unknown>;
}
export async function executeKdf(password: string, configuration: KdfConfiguration): Promise<Uint8Array> {
switch (configuration.algorithm) {
case "argon2id": {
const options = configuration.params;
if (!isArgon2idOptions(options)) throw new Error("Invalid format of argon2id params");
return Argon2id.execute(password, cosmjsSalt, options);
}
default:
throw new Error("Unsupported KDF algorithm");
}
}
/**
* Configuration how to encrypt data or how data was encrypted.
* This is stored as part of the wallet serialization and must only contain JSON types.
*/
export interface EncryptionConfiguration {
/**
* An algorithm identifier, such as "xchacha20poly1305-ietf".
*/
readonly algorithm: string;
/** A map of algorithm-specific parameters */
readonly params?: Record<string, unknown>;
}
export const supportedAlgorithms = {
xchacha20poly1305Ietf: "xchacha20poly1305-ietf",
};
export async function encrypt(
plaintext: Uint8Array,
encryptionKey: Uint8Array,
config: EncryptionConfiguration,
): Promise<Uint8Array> {
switch (config.algorithm) {
case supportedAlgorithms.xchacha20poly1305Ietf: {
const nonce = Random.getBytes(xchacha20NonceLength);
// Prepend fixed-length nonce to ciphertext as suggested in the example from https://github.com/jedisct1/libsodium.js#api
return new Uint8Array([
...nonce,
...(await Xchacha20poly1305Ietf.encrypt(plaintext, encryptionKey, nonce)),
]);
}
default:
throw new Error(`Unsupported encryption algorithm: '${config.algorithm}'`);
}
}
export async function decrypt(
ciphertext: Uint8Array,
encryptionKey: Uint8Array,
config: EncryptionConfiguration,
): Promise<Uint8Array> {
switch (config.algorithm) {
case supportedAlgorithms.xchacha20poly1305Ietf: {
const nonce = ciphertext.slice(0, xchacha20NonceLength);
return Xchacha20poly1305Ietf.decrypt(ciphertext.slice(xchacha20NonceLength), encryptionKey, nonce);
}
default:
throw new Error(`Unsupported encryption algorithm: '${config.algorithm}'`);
}
}