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support aes 256 decryption keys

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liamcottle
2024-05-27 01:25:38 +12:00
parent 135c2528f5
commit 43d6f5be75
1 changed files with 14 additions and 2 deletions
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16
src/mqtt.js
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@ -238,8 +238,20 @@ function decrypt(packet) {
// create decryption iv/nonce for this packet
const nonceBuffer = createNonce(packet.id, packet.from);
// create aes-128-ctr decipher
const decipher = crypto.createDecipheriv('aes-128-ctr', key, nonceBuffer);
// determine algorithm based on key length
var algorithm = null;
if(key.length === 16){
algorithm = "aes-128-ctr";
} else if(key.length === 32){
algorithm = "aes-256-ctr";
} else {
// skip this key, try the next one...
console.error(`Invalid decryption key length: ${key.length}`);
continue;
}
// create decipher
const decipher = crypto.createDecipheriv(algorithm, key, nonceBuffer);
// decrypt encrypted packet
const decryptedBuffer = Buffer.concat([decipher.update(packet.encrypted), decipher.final()]);