How to use the @walletconnect/utils.convertArrayBufferToBuffer function in @walletconnect/utils

export async function encrypt (
  data: IJsonRpcRequest | IJsonRpcResponseSuccess | IJsonRpcResponseError,
  key: ArrayBuffer
): Promise {
  const _key: Buffer = convertArrayBufferToBuffer(key)

  const ivArrayBuffer: ArrayBuffer = await generateKey(128)
  const iv: Buffer = convertArrayBufferToBuffer(ivArrayBuffer)
  const ivHex: string = convertBufferToHex(iv, true)

  const contentString: string = JSON.stringify(data)
  const content: Buffer = convertUtf8ToBuffer(contentString)

  const cipherText: Buffer = await aesCbcEncrypt(content, _key, iv)
  const cipherTextHex: string = convertBufferToHex(cipherText, true)

  const unsigned: Buffer = concatBuffers(cipherText, iv)
  const hmac: Buffer = await createHmac(unsigned, _key)
  const hmacHex: string = convertBufferToHex(hmac, true)

  return {

export async function encrypt (
  data: IJsonRpcRequest | IJsonRpcResponseSuccess | IJsonRpcResponseError,
  key: ArrayBuffer
): Promise {
  const _key: Buffer = convertArrayBufferToBuffer(key)

  const ivArrayBuffer: ArrayBuffer = await generateKey(128)
  const iv: Buffer = convertArrayBufferToBuffer(ivArrayBuffer)
  const ivHex: string = convertBufferToHex(iv, true)

  const contentString: string = JSON.stringify(data)
  const content: Buffer = convertUtf8ToBuffer(contentString)

  const cipherText: Buffer = await aesCbcEncrypt(content, _key, iv)
  const cipherTextHex: string = convertBufferToHex(cipherText, true)

  const unsigned: Buffer = concatBuffers(cipherText, iv)
  const hmac: Buffer = await createHmac(unsigned, _key)
  const hmacHex: string = convertBufferToHex(hmac, true)

  return {
    data: cipherTextHex,
    hmac: hmacHex,
    iv: ivHex

export async function decrypt (
  payload: IEncryptionPayload,
  key: ArrayBuffer
): Promise<
  IJsonRpcRequest | IJsonRpcResponseSuccess | IJsonRpcResponseError | null
> {
  const _key: Buffer = convertArrayBufferToBuffer(key)

  if (!_key) {
    throw new Error('Missing key: required for decryption')
  }

  const verified: boolean = await verifyHmac(payload, _key)
  if (!verified) {
    return null
  }

  const cipherText: Buffer = convertHexToBuffer(payload.data)
  const iv: Buffer = convertHexToBuffer(payload.iv)
  const buffer: Buffer = await aesCbcDecrypt(cipherText, _key, iv)
  const utf8: string = convertBufferToUtf8(buffer)
  let data: IJsonRpcRequest
  try {