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refactor: turn hkdf functions to async and remove extra deps (#1272)

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* refactor: remove futoin-hkdf dependency and update hkdf implementation

* refactor: use crypto subtle and update functions to async

---------

Co-authored-by: Rajeh Taher <rajeh@reforward.dev>
This commit is contained in:
João Lucas de Oliveira Lopes
2025-03-01 13:31:48 -03:00
committed by GitHub
parent e6f98c3902
commit 8083754621
11 changed files with 78 additions and 48 deletions
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12
src/Utils/chat-utils.ts
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@@ -14,8 +14,8 @@ type FetchAppStateSyncKey = (keyId: string) => Promise<proto.Message.IAppStateSy
export type ChatMutationMap = { [index: string]: ChatMutation }
const mutationKeys = (keydata: Uint8Array) => {
const expanded = hkdf(keydata, 160, { info: 'WhatsApp Mutation Keys' })
const mutationKeys = async(keydata: Uint8Array) => {
const expanded = await hkdf(keydata, 160, { info: 'WhatsApp Mutation Keys' })
return {
indexKey: expanded.slice(0, 32),
valueEncryptionKey: expanded.slice(32, 64),
@@ -144,7 +144,7 @@ export const encodeSyncdPatch = async(
})
const encoded = proto.SyncActionData.encode(dataProto).finish()
const keyValue = mutationKeys(key.keyData!)
const keyValue = await mutationKeys(key.keyData!)
const encValue = aesEncrypt(encoded, keyValue.valueEncryptionKey)
const valueMac = generateMac(operation, encValue, encKeyId, keyValue.valueMacKey)
@@ -261,7 +261,7 @@ export const decodeSyncdPatch = async(
throw new Boom(`failed to find key "${base64Key}" to decode patch`, { statusCode: 404, data: { msg } })
}
const mainKey = mutationKeys(mainKeyObj.keyData!)
const mainKey = await mutationKeys(mainKeyObj.keyData!)
const mutationmacs = msg.mutations!.map(mutation => mutation.record!.value!.blob!.slice(-32))
const patchMac = generatePatchMac(msg.snapshotMac!, mutationmacs, toNumber(msg.version!.version), name, mainKey.patchMacKey)
@@ -390,7 +390,7 @@ export const decodeSyncdSnapshot = async(
throw new Boom(`failed to find key "${base64Key}" to decode mutation`)
}
const result = mutationKeys(keyEnc.keyData!)
const result = await mutationKeys(keyEnc.keyData!)
const computedSnapshotMac = generateSnapshotMac(newState.hash, newState.version, name, result.snapshotMacKey)
if(Buffer.compare(snapshot.mac!, computedSnapshotMac) !== 0) {
throw new Boom(`failed to verify LTHash at ${newState.version} of ${name} from snapshot`)
@@ -458,7 +458,7 @@ export const decodePatches = async(
throw new Boom(`failed to find key "${base64Key}" to decode mutation`)
}
const result = mutationKeys(keyEnc.keyData!)
const result = await mutationKeys(keyEnc.keyData!)
const computedSnapshotMac = generateSnapshotMac(newState.hash, newState.version, name, result.snapshotMacKey)
if(Buffer.compare(snapshotMac!, computedSnapshotMac) !== 0) {
throw new Boom(`failed to verify LTHash at ${newState.version} of ${name}`)