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feat: using old voice encryption modes (for video)

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Elysia
2024-08-24 20:21:39 +07:00
parent 2cf9b36ce7
commit 7e5dd06c2b
4 changed files with 71 additions and 16 deletions
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37
src/client/voice/dispatcher/BaseDispatcher.js
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@@ -9,9 +9,7 @@ const kill = require('tree-kill');
const secretbox = require('../util/Secretbox');
const CHANNELS = 2;
const MAX_NONCE_SIZE = 2 ** 32 - 1;
const nonce = Buffer.alloc(24);
/**
* @external WritableStream
@@ -36,10 +34,7 @@ class BaseDispatcher extends Writable {
this.extensionEnabled = extensionEnabled;
this._nonce = 0;
this._nonceBuffer =
this.player.voiceConnection.authentication.mode === 'aead_aes256_gcm_rtpsize'
? Buffer.alloc(12)
: Buffer.alloc(24);
this._nonceBuffer = null;
/**
* The time that the stream was paused at (null if not paused)
@@ -89,6 +84,13 @@ class BaseDispatcher extends Writable {
});
}
resetNonceBuffer() {
this._nonceBuffer =
this.player.voiceConnection.authentication.mode === 'aead_aes256_gcm_rtpsize'
? Buffer.alloc(12)
: Buffer.alloc(24);
}
get TIMESTAMP_INC() {
return this.extensionEnabled ? 90000 / this.fps : 480 * CHANNELS;
}
@@ -111,7 +113,7 @@ class BaseDispatcher extends Writable {
getNewSequence() {
const currentSeq = this.sequence;
this.sequence++;
if (this.sequence >= 2 ** 16) this.sequence = 0;
if (this.sequence > 2 ** 16 - 1) this.sequence = 0;
return currentSeq;
}
@@ -307,6 +309,9 @@ class BaseDispatcher extends Writable {
// Both supported encryption methods want the nonce to be an incremental integer
this._nonce++;
if (this._nonce > MAX_NONCE_SIZE) this._nonce = 0;
if (!this._nonceBuffer) {
this.resetNonceBuffer();
}
this._nonceBuffer.writeUInt32BE(this._nonce, 0);
// 4 extra bytes of padding on the end of the encrypted packet
@@ -333,6 +338,16 @@ class BaseDispatcher extends Writable {
return [encrypted, noncePadding];
}
case 'xsalsa20_poly1305_lite': {
return [secretbox.methods.close(buffer, this._nonceBuffer, secret_key), noncePadding];
}
case 'xsalsa20_poly1305_suffix': {
const random = secretbox.methods.random(24);
return [secretbox.methods.close(buffer, random, secret_key), random];
}
case 'xsalsa20_poly1305': {
return [secretbox.methods.close(buffer, Buffer.concat([additionalData, Buffer.alloc(12)]), secret_key)];
}
default: {
// This should never happen. Our encryption mode is chosen from a list given to us by the gateway and checked with the ones we support.
throw new RangeError(`Unsupported encryption method: ${mode}`);
@@ -342,9 +357,9 @@ class BaseDispatcher extends Writable {
_createPacket(buffer, isLastPacket = false) {
// Header
const rtpHeader = Buffer.alloc(12);
rtpHeader[0] = this.extensionEnabled ? 0x90 : 0x80; // 0b10000000 | ((this.extensionEnabled ? 1 : 0) << 4);
rtpHeader[1] = this.payloadType;
const rtpHeader = Buffer.alloc(12); // RTP_HEADER_SIZE
rtpHeader[0] = this.extensionEnabled ? 0x90 : 0x80; // Version + Flags (1 byte)
rtpHeader[1] = this.payloadType; // Payload Type (1 byte)
if (this.extensionEnabled) {
if (isLastPacket) {
@@ -356,8 +371,6 @@ class BaseDispatcher extends Writable {
rtpHeader.writeUIntBE(this.timestamp, 4, 4);
rtpHeader.writeUIntBE(this.player.voiceConnection.authentication.ssrc + this.extensionEnabled, 8, 4);
rtpHeader.copy(nonce, 0, 0, 12);
return Buffer.concat([rtpHeader, ...this._encrypt(buffer, rtpHeader)]);
}