remove nip-44 stuff.

nip44.ts

@@ -1,107 +0,0 @@
-import { chacha20 } from '@noble/ciphers/chacha'
-import { ensureBytes, equalBytes } from '@noble/ciphers/utils'
-import { secp256k1 } from '@noble/curves/secp256k1'
-import { hkdf } from '@noble/hashes/hkdf'
-import { hmac } from '@noble/hashes/hmac'
-import { sha256 } from '@noble/hashes/sha256'
-import { concatBytes, randomBytes } from '@noble/hashes/utils'
-import { base64 } from '@scure/base'
-import { utf8Decoder, utf8Encoder } from './utils.ts'
-
-export const utils = {
-  v2: {
-    maxPlaintextSize: 65536 - 128, // 64kb - 128
-    minCiphertextSize: 100, // should be 128 if min padded to 32b: base64(1+32+32+32)
-    maxCiphertextSize: 102400, // 100kb
-
-    getConversationKey(privkeyA: string, pubkeyB: string): Uint8Array {
-      const key = secp256k1.getSharedSecret(privkeyA, '02' + pubkeyB)
-      return key.subarray(1, 33)
-    },
-
-    getMessageKeys(conversationKey: Uint8Array, salt: Uint8Array) {
-      const keys = hkdf(sha256, conversationKey, salt, 'nip44-v2', 76)
-      return {
-        encryption: keys.subarray(0, 32),
-        nonce: keys.subarray(32, 44),
-        auth: keys.subarray(44, 76),
-      }
-    },
-
-    calcPadding(len: number): number {
-      if (!Number.isSafeInteger(len) || len < 0) throw new Error('expected positive integer')
-      if (len <= 32) return 32
-      const nextpower = 1 << (Math.floor(Math.log2(len - 1)) + 1)
-      const chunk = nextpower <= 256 ? 32 : nextpower / 8
-      return chunk * (Math.floor((len - 1) / chunk) + 1)
-    },
-
-    pad(unpadded: string): Uint8Array {
-      const unpaddedB = utf8Encoder.encode(unpadded)
-      const len = unpaddedB.length
-      if (len < 1 || len >= utils.v2.maxPlaintextSize) throw new Error('invalid plaintext length: must be between 1b and 64KB')
-      const paddedLen = utils.v2.calcPadding(len)
-      const zeros = new Uint8Array(paddedLen - len)
-      const lenBuf = new Uint8Array(2)
-      new DataView(lenBuf.buffer).setUint16(0, len)
-      return concatBytes(lenBuf, unpaddedB, zeros)
-    },
-
-    unpad(padded: Uint8Array): string {
-      const unpaddedLen = new DataView(padded.buffer).getUint16(0)
-      const unpadded = padded.subarray(2, 2 + unpaddedLen)
-      if (
-        unpaddedLen === 0 ||
-        unpadded.length !== unpaddedLen ||
-        padded.length !== 2 + utils.v2.calcPadding(unpaddedLen)
-      )
-        throw new Error('invalid padding')
-      return utf8Decoder.decode(unpadded)
-    },
-  },
-}
-
-export function encrypt(
-  key: Uint8Array,
-  plaintext: string,
-  options: { salt?: Uint8Array; version?: number } = {},
-): string {
-  const version = options.version ?? 2
-  if (version !== 2) throw new Error('unknown encryption version ' + version)
-  const salt = options.salt ?? randomBytes(32)
-  ensureBytes(salt, 32)
-  const keys = utils.v2.getMessageKeys(key, salt)
-  const padded = utils.v2.pad(plaintext)
-  const ciphertext = chacha20(keys.encryption, keys.nonce, padded)
-  const mac = hmac(sha256, keys.auth, ciphertext)
-  return base64.encode(concatBytes(new Uint8Array([version]), salt, ciphertext, mac))
-}
-
-export function decrypt(key: Uint8Array, ciphertext: string): string {
-  const u = utils.v2
-  ensureBytes(key, 32)
-
-  const clen = ciphertext.length
-  if (clen < u.minCiphertextSize || clen >= u.maxCiphertextSize) throw new Error('invalid ciphertext length: ' + clen)
-
-  if (ciphertext[0] === '#') throw new Error('unknown encryption version')
-  let data: Uint8Array
-  try {
-    data = base64.decode(ciphertext)
-  } catch (error) {
-    throw new Error('invalid base64: ' + (error as any).message)
-  }
-  const vers = data.subarray(0, 1)[0]
-  if (vers !== 2) throw new Error('unknown encryption version ' + vers)
-
-  const salt = data.subarray(1, 33)
-  const ciphertext_ = data.subarray(33, -32)
-  const mac = data.subarray(-32)
-
-  const keys = u.getMessageKeys(key, salt)
-  const calculatedMac = hmac(sha256, keys.auth, ciphertext_)
-  if (!equalBytes(calculatedMac, mac)) throw new Error('invalid MAC')
-
-  const padded = chacha20(keys.encryption, keys.nonce, ciphertext_)
-  return u.unpad(padded)
-}