@penumbra-zone/bech32m

This package is for validating and manipulating bech32m strings relevant to the Penumbra blockchain.

• validate bech32m strings, including checksums
• enforce expected lengths of input and output
• convert back and forth between string and binary representations

Simple use

It is recommended to use the typed functions provided in the submodules, each named after the relevant prefix.

import { fullViewingKeyFromBech32m } from '@penumbra-zone/bech32m/penumbrafullviewingkey';
import { bech32mIdentityKey } from '@penumbra-zone/bech32m/penumbravalid';

// typical use
const fvk: { inner: Uint8Array } = fullViewingKeyFromBech32m(
  'penumbrafullviewingkey1vzfytwlvq067g2kz095vn7sgcft47hga40atrg5zu2crskm6tyyjysm28qg5nth2fqmdf5n0q530jreumjlsrcxjwtfv6zdmfpe5kqsa5lg09i',
);

// will throw
const badFvk: { inner: Uint8Array } = fullViewingKeyFromBech32m('penumbrafullviewingkey1badinput');

// will succeed, but this all-zero key identifies nothing
const validator: string = bech32mIdentityKey({ ik: new Uint8Array(32) });

Typical use

If you're working with Penumbra bech32m strings, there's a good chance you also want to use our protobuf message types.

Exported functions do not explicitly refer to those types, in order to permit production use without bundling the definitions, but all input/output will satisfy the relevant structures.

import { assetIdFromBech32m } from '@penumbra-zone/bech32m/passet';
import { plpidFromBech32m } from '@penumbra-zone/bech32m/plpid';
import { spendKeyFromBech32m } from '@penumbra-zone/bech32m/penumbraspendkey';

import type { PlainMessage, PartialMessage } from '@bufbuild/protobuf';
import type { AssetId } from '@penumbra-zone/protobuf/penumbra/core/asset/v1/asset_pb';
import type { PositionId } from '@penumbra-zone/protobuf/penumbra/core/component/dex/v1/dex_pb';
import { SpendKey } from '@penumbra-zone/protobuf/penumbra/core/keys/v1/keys_pb';

const plainAssetId: PlainMessage<AssetId> = assetIdFromBech32m(
  'passet1vhga2czmpk76hsu3t7usjj2a2qga0u29vqlcp3hky8lwkfz30qrqy6gaae',
);

const partialPositionId: PartialMessage<PositionId> = plpidFromBech32(
  'plpid1fkf3tlv500vgzwc6dkc7g9wnuv6rzezhefefdywq5tt4lyl97rgsd6j689',
);

// you must explicitly construct the object if you want to use functions
// available on the @bufbuild/protobuf Message class

const realSpendKey: SpendKey = new SpendKey(
  spendKeyFromBech32m(
    'penumbraspendkey1qul0huewkcmemljd5m3vz3awqt7442tjg2dudahvzu6eyj9qf0eszrnguh',
  ),
);

// marshal to protojson
realSpendKey.toJson();
// { "inner": "Bz778y62N53+TabiwUeuAv1aqXJCm8b27Bc1kkigS/M=" }

// true
realSpendKey.equals({
  inner: new Uint8Array([
    0x07, 0x3e, 0xfb, 0xf3, 0x2e, 0xb6, 0x37, 0x9d, 0xfe, 0x4d, 0xa6, 0xe2, 0xc1, 0x47, 0xae, 0x02,
    0xfd, 0x5a, 0xa9, 0x72, 0x42, 0x9b, 0xc6, 0xf6, 0xec, 0x17, 0x35, 0x92, 0x48, 0xa0, 0x4b, 0xf3,
  ]),
});

Constants only

If you already have a validation solution and just need the parameters, you can import simple constants from the main module. This technique should bundle very small.

import {
  PENUMBRA_BECH32M_ADDRESS_LENGTH as pnLength,
  PENUMBRA_BECH32M_ADDRESS_PREFIX as pnPrefix,
} from '@penumbra-zone/bech32m';

// matches prefix, length, and valid charset. no checksum validation.
export const addressRegex = new RegEx(
  `^${pnPrefix}1[02-9ac-hj-np-z]{${pnLength - (pnPrefix.length + 1)}}$`,
);

penumbracompat1 is bech32, not bech32m

For IBC compatibility, we provide a penumbracompat1 address format that is bech32 instead of bech32m. You can use penumbracompat1 when interacting with any chain that does not support a bech32m destination.

import { bech32Address } from '@penumbra-zone/bech32m/penumbra';
import { bech32CompatAddress } from '@penumbra-zone/bech32m/penumbracompat1';

const bech32Chains = ['noble', 'nobletestnet'];
const getCompatibleAddress = (chainName: string, address: { inner: Uint8Array }): string => {
  return bech32Chains.includes(chainName) ? bech32CompatAddress(address) : bech32mAddress(address);
};