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🐛 Update decryption keys

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This commit is contained in:
C-3PO 2018-07-05 02:55:18 +02:00
parent 3e9f4843f8
commit dac2e9286c
Signed by: c3po
GPG key ID: 62993C4BB4D86F24
2 changed files with 7 additions and 5 deletions
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4
src/ssn/decryption/decryptChunk.ts
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@ -1,6 +1,6 @@
import updateKeys from './lib/updateKeys';
export default function decryptChunk(encryptedChunk: Buffer, [key0, key1, key2]: [number, number, number]): Buffer {
export default function decryptChunk(encryptedChunk: Buffer, [key0, key1, key2]: [number, number, number]): {decryptedChunk: Buffer, keys: [number, number, number]} {
const dv = new DataView(encryptedChunk.buffer);
const decryptedChunk = Buffer.alloc(encryptedChunk.length);
@ -21,5 +21,5 @@ export default function decryptChunk(encryptedChunk: Buffer, [key0, key1, key2]:
[key0, key1, key2] = updateKeys([key0, key1, key2], curChar);
}
return decryptedChunk;
return { decryptedChunk, keys: [key0, key1, key2] };
}

8
src/ssn/streams/decryptStream.ts
View file

@ -1,7 +1,7 @@
import * as stream from 'stream';
import decryptChunk from '../decryption/decryptChunk';
export default function decryptStream(inputStream: stream.Readable, decryptionKeys: [number, number, number]): stream.Readable {
export default function decryptStream(inputStream: stream.Readable, [key0, key1, key2]: [number, number, number]): stream.Readable {
let skippedRandomHeader = false;
const outStream = new stream.Readable({
@ -9,7 +9,8 @@ export default function decryptStream(inputStream: stream.Readable, decryptionKe
//There are 12 random bytes at the beginning, we need to use them to initialize the decryption keys, but we can ignore the decrypted bytes.
if (!skippedRandomHeader) {
const encryptedHeader: Buffer = inputStream.read(12);
decryptChunk(encryptedHeader, decryptionKeys);
const { keys } = decryptChunk(encryptedHeader, [key0, key1, key2]);
[key0, key1, key2] = keys;
skippedRandomHeader = true;
}
@ -19,7 +20,8 @@ export default function decryptStream(inputStream: stream.Readable, decryptionKe
//If end has been reached, stop
this.push(null);
} else {
const decryptedChunk = decryptChunk(encryptedChunk, decryptionKeys);
const { decryptedChunk, keys } = decryptChunk(encryptedChunk, [key0, key1, key2]);
[key0, key1, key2] = keys;
this.push(decryptedChunk);
}
},