import { convertPublicKey , convertSecretKey } from 'ed2curve' ; import multibase from 'multibase' ; import nacl from 'tweetnacl' ; import type { Private , Public } from './identity' ; import { decodePrivateKey , decodePublicKey } from './proto.keys' ; const nonceBytes = 24 ; const privateKeyBytes = 32 ; const publicKeyBytes = 32 ; /**
 * Decrypts the given `data` using a Curve25519 variant of the private key.
 *
 * Assumes ciphertext includes ephemeral public key and nonce used in original
 * encryption (e.g., via  encrypt function).
 *
 *  see https for conversion details.
 *  param ciphertext export async function decrypt ( ciphertext , privKey , type = 'ed25519' ) { if ( type !== 'ed25519' ) { throw Error ( `'${ type }' type keys are not currently supported` ) ; } const pk = convertSecretKey ( privKey ) ; if ( ! pk ) { throw Error ( 'could not convert key type' ) ; } const nonce = ciphertext . slice ( 0 , nonceBytes ) ; const ephemeral = ciphertext . slice ( nonceBytes , nonceBytes + publicKeyBytes ) ; const ct = ciphertext . slice ( nonceBytes + publicKeyBytes ) ; const plaintext = nacl . box . open ( ct , nonce , ephemeral , pk ) ; if ( ! plaintext ) { throw Error ( 'failed to decrypt curve25519' ) ; } return Uint8Array . from ( plaintext ) ; } see https for conversion details.
 *  param data export async function encrypt ( data , pubKey , type = 'ed25519' ) { if ( type !== 'ed25519' ) { throw Error ( `'${ type }' type keys are not currently supported` ) ; } const ephemeral = nacl . box . keyPair ( ) ; const pk = convertPublicKey ( pubKey ) ; if ( ! pk ) { throw Error ( 'could not convert key type' ) ; } const nonce = nacl . randomBytes ( 24 ) ; const ciphertext = nacl . box ( data , nonce , pk , ephemeral . secretKey ) ; const merged = new Uint8Array ( nonceBytes + publicKeyBytes + ciphertext . byteLength ) ; merged . set ( new Uint8Array ( nonce ) , 0 ) ; merged . set ( new Uint8Array ( ephemeral . publicKey ) , nonceBytes ) ; merged . set ( new Uint8Array ( ciphertext ) , nonceBytes + publicKeyBytes ) ; return Uint8Array . from ( merged ) ; } param bytes The protobuf-encoded bytes of a  Public key.
  export function publicKeyBytesToString ( bytes ) { const encoded = multibase . encode ( 'base32' , bytes ) ; return new TextDecoder ( ) . decode ( encoded ) ; } param bytes The protobuf-encoded bytes of a  Private key.
  export function privateKeyBytesToString ( bytes ) { const encoded = multibase . encode ( 'base32' , bytes ) ; return new TextDecoder ( ) . decode ( encoded ) ; } param key The  Public key to encode.
  export function publicKeyToString ( key ) { return publicKeyBytesToString ( key . bytes ) ; } param key export function privateKeyToString ( key ) { return privateKeyBytesToString ( key . bytes ) ; } /**
 * Decode the given base-32 encoded multibase string into a  Public key.
 *  param str export function publicKeyBytesFromString ( str ) { const decoded = multibase . decode ( str ) ; const obj = decodePublicKey ( decoded ) ; const bytes = obj . Data ; return bytes . slice ( 0 , publicKeyBytes ) ; } /**
 * Decode the given base-32 encoded multibase string into a  Private key.
 *  param str export function privateKeyFromString ( str ) { const decoded = multibase . decode ( str ) ; const obj = decodePrivateKey ( decoded ) ; const bytes = obj . Data ; return bytes . slice ( 0 , privateKeyBytes ) ; } /**
 * Utility function to extract the raw bytes from a  Public key.
 *  param key export function extractPublicKeyBytes ( key ) { const obj = decodePublicKey ( key . bytes ) ; const bytes = obj . Data ; return bytes . slice ( 0 , publicKeyBytes ) ; }