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Backup Server APIs

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Fedor Indutny 2024-04-22 16:11:36 +02:00 • committed by GitHub
parent 77aea40a63
commit 3eb0e30a23
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14 changed files with 991 additions and 201 deletions
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25
ts/Crypto.ts
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@ -154,6 +154,31 @@ export function deriveBackupKey(masterKey: Uint8Array): Uint8Array {
);
}
const BACKUP_SIGNATURE_KEY_LEN = 32;
const BACKUP_SIGNATURE_KEY_INFO =
'20231003_Signal_Backups_GenerateBackupIdKeyPair';
export function deriveBackupSignatureKey(
backupKey: Uint8Array,
aciBytes: Uint8Array
): Uint8Array {
if (backupKey.byteLength !== BACKUP_KEY_LEN) {
throw new Error('deriveBackupId: invalid backup key length');
}
if (aciBytes.byteLength !== UUID_BYTE_SIZE) {
throw new Error('deriveBackupId: invalid aci length');
}
const hkdf = HKDF.new(3);
return hkdf.deriveSecrets(
BACKUP_SIGNATURE_KEY_LEN,
Buffer.from(backupKey),
Buffer.from(BACKUP_SIGNATURE_KEY_INFO),
Buffer.from(aciBytes)
);
}
const BACKUP_ID_LEN = 16;
const BACKUP_ID_INFO = '20231003_Signal_Backups_GenerateBackupId';