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Refactor key backup recovery to prepare for rust (#3708)
* Refactor key backup recovery to prepare for rust * code review * quick doc format * code review fix
This commit is contained in:
Valere
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@ -26,10 +26,15 @@ python -m venv env
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import base64
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import json
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import base58
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from canonicaljson import encode_canonical_json
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from cryptography.hazmat.primitives.asymmetric import ed25519, x25519
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from cryptography.hazmat.primitives.serialization import Encoding, PublicFormat
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from cryptography.hazmat.primitives import hashes, padding, hmac
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from cryptography.hazmat.primitives.kdf.hkdf import HKDF
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from random import randbytes, seed
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ALICE_DATA = {
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@ -77,6 +82,7 @@ def main() -> None:
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import {{ IDeviceKeys, IMegolmSessionData }} from "../../../src/@types/crypto";
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import {{ IDownloadKeyResult }} from "../../../src";
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import {{ KeyBackupInfo }} from "../../../src/crypto-api";
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import {{ IKeyBackupSession }} from "../../../src/crypto/keybackup";
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/* eslint-disable comma-dangle */
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@ -186,6 +192,10 @@ def build_test_data(user_data, prefix = "") -> str:
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}
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}
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backed_up_room_key = encrypt_megolm_key_for_backup(additional_exported_room_key, backup_decryption_key.public_key())
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backup_recovery_key = export_recovery_key(user_data["B64_BACKUP_DECRYPTION_KEY"])
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return f"""\
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export const {prefix}TEST_USER_ID = "{user_data['TEST_USER_ID']}";
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export const {prefix}TEST_DEVICE_ID = "{user_data['TEST_DEVICE_ID']}";
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@ -220,9 +230,15 @@ export const {prefix}SIGNED_CROSS_SIGNING_KEYS_DATA: Partial<IDownloadKeyResult>
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json.dumps(build_cross_signing_keys_data(user_data), indent=4)
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};
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/** Signed OTKs, returned by `POST /keys/claim` */
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export const {prefix}ONE_TIME_KEYS = { json.dumps(otks, indent=4) };
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/** base64-encoded backup decryption (private) key */
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export const {prefix}BACKUP_DECRYPTION_KEY_BASE64 = "{ user_data['B64_BACKUP_DECRYPTION_KEY'] }";
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/** Backup decryption key in export format */
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export const {prefix}BACKUP_DECRYPTION_KEY_BASE58 = "{ backup_recovery_key }";
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/** Signed backup data, suitable for return from `GET /_matrix/client/v3/room_keys/keys/{{roomId}}/{{sessionId}}` */
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export const {prefix}SIGNED_BACKUP_DATA: KeyBackupInfo = { json.dumps(backup_data, indent=4) };
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@ -236,8 +252,8 @@ export const {prefix}MEGOLM_SESSION_DATA: IMegolmSessionData = {
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json.dumps(additional_exported_room_key, indent=4)
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};
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/** Signed OTKs, returned by `POST /keys/claim` */
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export const {prefix}ONE_TIME_KEYS = { json.dumps(otks, indent=4) };
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/** The key from {prefix}MEGOLM_SESSION_DATA, encrypted for backup using `m.megolm_backup.v1.curve25519-aes-sha2` algorithm*/
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export const {prefix}CURVE25519_KEY_BACKUP_DATA: IKeyBackupSession = {json.dumps(backed_up_room_key, indent=4)};
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"""
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@ -367,6 +383,97 @@ def build_exported_megolm_key() -> dict:
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return megolm_export
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def encrypt_megolm_key_for_backup(session_data: dict, backup_public_key: x25519.X25519PublicKey) -> dict:
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"""
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Encrypts an exported megolm key for key backup, using the m.megolm_backup.v1.curve25519-aes-sha2 algorithm.
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"""
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data = encode_canonical_json(session_data)
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# Generate an ephemeral curve25519 key, and perform an ECDH with the ephemeral key
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# and the backup’s public key to generate a shared secret.
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# The public half of the ephemeral key, encoded using unpadded base64,
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# becomes the ephemeral property of the session_data.
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ephemeral_keypair = x25519.X25519PrivateKey.from_private_bytes(randbytes(32))
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shared_secret = ephemeral_keypair.exchange(backup_public_key)
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ephemeral = encode_base64(ephemeral_keypair.public_key().public_bytes(Encoding.Raw, PublicFormat.Raw))
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# Using the shared secret, generate 80 bytes by performing an HKDF using SHA-256 as the hash,
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# with a salt of 32 bytes of 0, and with the empty string as the info.
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# The first 32 bytes are used as the AES key, the next 32 bytes are used as the MAC key,
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# and the last 16 bytes are used as the AES initialization vector.
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salt = bytes(32)
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info = b""
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hkdf = HKDF(
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algorithm=hashes.SHA256(),
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length=80,
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salt=salt,
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info=info,
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)
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raw_key = hkdf.derive(shared_secret)
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aes_key = raw_key[:32]
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mac = raw_key[32:64]
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iv = raw_key[64:80]
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# Stringify the JSON object, and encrypt it using AES-CBC-256 with PKCS#7 padding.
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# This encrypted data, encoded using unpadded base64, becomes the ciphertext property of the session_data.
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cipher = Cipher(algorithms.AES(aes_key), modes.CBC(iv))
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encryptor = cipher.encryptor()
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padder = padding.PKCS7(128).padder()
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padded_data = padder.update(data) + padder.finalize()
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ct = encryptor.update(padded_data) + encryptor.finalize()
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cipher_text = encode_base64(ct)
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# Pass the raw encrypted data (prior to base64 encoding) through HMAC-SHA-256 using the MAC key generated above.
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# The first 8 bytes of the resulting MAC are base64-encoded, and become the mac property of the session_data.
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h = hmac.HMAC(mac, hashes.SHA256())
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# h.update(ct)
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signature = h.finalize()
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mac = encode_base64(signature[:8])
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encrypted_key = {
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"first_message_index": 1,
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"forwarded_count": 0,
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"is_verified": False,
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"session_data": {
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"ciphertext": cipher_text,
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"ephemeral": ephemeral,
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"mac": mac
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}
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}
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return encrypted_key
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def export_recovery_key(key_b64: str) -> str:
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"""
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Export a private recovery key as a recovery key that can be presented to users.
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As per spec https://spec.matrix.org/v1.8/client-server-api/#recovery-key
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"""
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private_key_bytes = base64.b64decode(key_b64)
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# The 256-bit curve25519 private key is prepended by the bytes 0x8B and 0x01
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export_bytes = bytearray()
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export_bytes += b'\x8b'
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export_bytes += b'\x01'
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export_bytes += private_key_bytes
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# All the bytes in the string above, including the two header bytes,
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# are XORed together to form a parity byte. This parity byte is appended to the byte string.
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parity_byte = 0 #b'\x8b' ^ b'\x01'
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[parity_byte := parity_byte ^ x for x in export_bytes]
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export_bytes += parity_byte.to_bytes(1, 'big')
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# The byte string is encoded using base58
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recovery_key = base58.b58encode(export_bytes).decode('utf-8')
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split = [recovery_key[i:i + 4] for i in range(0, len(recovery_key), 4)]
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return ' '.join(split)
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if __name__ == "__main__":
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main()
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@ -6,6 +6,7 @@
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import { IDeviceKeys, IMegolmSessionData } from "../../../src/@types/crypto";
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import { IDownloadKeyResult } from "../../../src";
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import { KeyBackupInfo } from "../../../src/crypto-api";
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import { IKeyBackupSession } from "../../../src/crypto/keybackup";
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/* eslint-disable comma-dangle */
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@ -102,9 +103,28 @@ export const SIGNED_CROSS_SIGNING_KEYS_DATA: Partial<IDownloadKeyResult> = {
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}
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};
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/** Signed OTKs, returned by `POST /keys/claim` */
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export const ONE_TIME_KEYS = {
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"@alice:localhost": {
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"test_device": {
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"signed_curve25519:AAAAHQ": {
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"key": "j3fR3HemM16M7CWhoI4Sk5ZsdmdfQHsKL1xuSft6MSw",
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"signatures": {
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"@alice:localhost": {
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"ed25519:test_device": "25djC6Rk6gIgFBMVawY9X9LnY8XMMziey6lKqL8Q5Bbp7T1vw9uk0RE7eKO2a/jNLcYroO2xRztGhBrKz5sOCQ"
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}
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}
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}
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}
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}
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};
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/** base64-encoded backup decryption (private) key */
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export const BACKUP_DECRYPTION_KEY_BASE64 = "dwdtCnMYpX08FsFyUbJmRd9ML4frwJkqsXf7pR25LCo=";
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/** Backup decryption key in export format */
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export const BACKUP_DECRYPTION_KEY_BASE58 = "EsTc LW2K PGiF wKEA 3As5 g5c4 BXwk qeeJ ZJV8 Q9fu gUMN UE4d";
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/** Signed backup data, suitable for return from `GET /_matrix/client/v3/room_keys/keys/{roomId}/{sessionId}` */
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export const SIGNED_BACKUP_DATA: KeyBackupInfo = {
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"algorithm": "m.megolm_backup.v1.curve25519-aes-sha2",
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@ -158,19 +178,15 @@ export const MEGOLM_SESSION_DATA: IMegolmSessionData = {
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"forwarding_curve25519_key_chain": []
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};
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/** Signed OTKs, returned by `POST /keys/claim` */
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export const ONE_TIME_KEYS = {
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"@alice:localhost": {
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"test_device": {
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"signed_curve25519:AAAAHQ": {
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"key": "j3fR3HemM16M7CWhoI4Sk5ZsdmdfQHsKL1xuSft6MSw",
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"signatures": {
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"@alice:localhost": {
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"ed25519:test_device": "25djC6Rk6gIgFBMVawY9X9LnY8XMMziey6lKqL8Q5Bbp7T1vw9uk0RE7eKO2a/jNLcYroO2xRztGhBrKz5sOCQ"
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}
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}
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}
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}
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/** The key from MEGOLM_SESSION_DATA, encrypted for backup using `m.megolm_backup.v1.curve25519-aes-sha2` algorithm*/
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export const CURVE25519_KEY_BACKUP_DATA: IKeyBackupSession = {
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"first_message_index": 1,
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"forwarded_count": 0,
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"is_verified": false,
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"session_data": {
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"ciphertext": "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",
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"ephemeral": "q+P1WdRtEiPIEtNuuGrRcueZxUbLnSKdsuTAkxewXgU",
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"mac": "OibmACbORhI"
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}
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};
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@ -267,9 +283,28 @@ export const BOB_SIGNED_CROSS_SIGNING_KEYS_DATA: Partial<IDownloadKeyResult> = {
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}
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};
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/** Signed OTKs, returned by `POST /keys/claim` */
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export const BOB_ONE_TIME_KEYS = {
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"@bob:xyz": {
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"bob_device": {
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"signed_curve25519:AAAAHQ": {
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"key": "j3fR3HemM16M7CWhoI4Sk5ZsdmdfQHsKL1xuSft6MSw",
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"signatures": {
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"@bob:xyz": {
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"ed25519:bob_device": "dlZc9VA/hP980Mxvu9qwi0qJx8VK7sADGOM48CE01YM7K/Mbty9lis/QjtQAWqDg371QyynVRjEzt9qj7eSFCg"
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}
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}
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}
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}
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}
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};
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/** base64-encoded backup decryption (private) key */
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export const BOB_BACKUP_DECRYPTION_KEY_BASE64 = "DwdtCnMYpX08FsFyUbJmRd9ML4frwJkqsXf7pR25LCo=";
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/** Backup decryption key in export format */
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export const BOB_BACKUP_DECRYPTION_KEY_BASE58 = "EsT5 Sd5m mEXs NQYE ibRe 3q9E 4aXW rHih 5f9J 6rU6 AfwY mASR";
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/** Signed backup data, suitable for return from `GET /_matrix/client/v3/room_keys/keys/{roomId}/{sessionId}` */
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export const BOB_SIGNED_BACKUP_DATA: KeyBackupInfo = {
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"algorithm": "m.megolm_backup.v1.curve25519-aes-sha2",
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@ -290,10 +325,10 @@ export const BOB_MEGOLM_SESSION_DATA_ARRAY: IMegolmSessionData[] = [
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"algorithm": "m.megolm.v1.aes-sha2",
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"room_id": "!roomA:example.org",
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"sender_key": "/Bu9e34hUClhddpf4E5gu5qEAdMY31+1A9HbiAeeQgo",
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"session_id": "X9SK5JceUdvUr9gZkmdfS78qmKztoL60oORJ9JA5XD8",
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"session_key": "AQAAAADbfOdUj/ec5bK4xVEhhRw+jfd1FD4uA0MLy7NyVHugZxyXNZUx5YEof4H9YyjBretviZreMSXqflbgYKz257rkKu7MPeKFf7zmln2GxX0F/p++GOnvpY1FqOglhfRQi3tqiyOa7SL4f7TuERDTOpMqlWhIfTKQnqy0AyF2vpDi5V/UiuSXHlHb1K/YGZJnX0u/Kpis7aC+tKDkSfSQOVw/",
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"session_id": "/2K+V777vipCxPZ0gpY9qcpz1DYaXwuMRIu0UEP0Wa0",
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"session_key": "AQAAAAAclzWVMeWBKH+B/WMowa3rb4ma3jEl6n5W4GCs9ue65CruzD3ihX+85pZ9hsV9Bf6fvhjp76WNRajoJYX0UIt7aosjmu0i+H+07hEQ0zqTKpVoSH0ykJ6stAMhdr6Q4uW5crBmdTTBIsqmoWsNJZKKoE2+ldYrZ1lrFeaJbjBIY/9ivle++74qQsT2dIKWPanKc9Q2Gl8LjESLtFBD9Fmt",
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"sender_claimed_keys": {
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"ed25519": "ZG6lrfATe+958wN1xaGf3dKG/CThEfkmNdp1jcu4zok"
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"ed25519": "F4P7f1Z0RjbiZMgHk1xBCG3KC4/Ng9PmxLJ4hQ13sHA"
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},
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"forwarding_curve25519_key_chain": []
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},
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@ -301,10 +336,10 @@ export const BOB_MEGOLM_SESSION_DATA_ARRAY: IMegolmSessionData[] = [
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"algorithm": "m.megolm.v1.aes-sha2",
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"room_id": "!roomA:example.org",
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"sender_key": "/Bu9e34hUClhddpf4E5gu5qEAdMY31+1A9HbiAeeQgo",
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"session_id": "F4P7f1Z0RjbiZMgHk1xBCG3KC4/Ng9PmxLJ4hQ13sHA",
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"session_key": "AQAAAACv0khqPrQ91MmWCgm0RTzfpn65AGCrRnAKLxGJdfSfECNZ8gyj34FZLwi+F+xC6ibFddcbLXW0mzR6PnTnHF3VHM4g/h+2rcxtlix8fySpIwFzaXViba7cOSy/b+dHTMZB40iA7F4y7AdTdHLv4N1XUj3puU/KVUIKf9/lEDLqyReD+39WdEY24mTIB5NcQQhtyguPzYPT5sSyeIUNd7Bw",
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"session_id": "+07YOpSgdZ1X9le3n3NMByw0V1B0H0Djnbm76jgmWoo",
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"session_key": "AQAAAAAjWfIMo9+BWS8IvhfsQuomxXXXGy11tJs0ej505xxd1RzOIP4ftq3MbZYsfH8kqSMBc2l1Ym2u3Dksv2/nR0zGQeNIgOxeMuwHU3Ry7+DdV1I96blPylVCCn/f5RAy6smKoaeylptPdXgVXmw3YBBUVYpHpm+xCIUUp9foAdb8hftO2DqUoHWdV/ZXt59zTAcsNFdQdB9A4525u+o4JlqK",
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"sender_claimed_keys": {
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"ed25519": "HxUKnGfeUu0fF3cLyCFSDXYtVCQHy/+33q9RkzKfsiU"
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"ed25519": "OsZMdC1gQ5nPr+L9tuT6xXsaFJkVPkgxP2FexHF1/QM"
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},
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"forwarding_curve25519_key_chain": []
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}
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@ -315,27 +350,23 @@ export const BOB_MEGOLM_SESSION_DATA: IMegolmSessionData = {
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"algorithm": "m.megolm.v1.aes-sha2",
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"room_id": "!roomA:example.org",
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"sender_key": "/Bu9e34hUClhddpf4E5gu5qEAdMY31+1A9HbiAeeQgo",
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"session_id": "OsZMdC1gQ5nPr+L9tuT6xXsaFJkVPkgxP2FexHF1/QM",
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"session_key": "AQAAAACvcoGk7mOY59fOqZaxFUiTCBRV1Ia94KBjAZx6kgdgBtkkvs50z8od8/Nc9ncK2UsEiXNvCTTp2dlN3du+Rx0/m7vet2ZOEEp2oYDjHMLLFmwd1gtlGuWYPdXA6Y1+9Yyph0/EDVfS+zd3XvbL0QgbyL43+yQnFNHKlxVJX1eiKTrGTHQtYEOZz6/i/bbk+sV7GhSZFT5IMT9hXsRxdf0D",
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"session_id": "gywydBrIJcJWktC/ic3tunKZM1XZm1MpYiYtdbj8Rpc",
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"session_key": "AQAAAADZJL7OdM/KHfPzXPZ3CtlLBIlzbwk06dnZTd3bvkcdP5u73rdmThBKdqGA4xzCyxZsHdYLZRrlmD3VwOmNfvWMqYdPxA1X0vs3d172y9EIG8i+N/skJxTRypcVSV9XoinBNIWr/gkyepuAKiQqemlc8J5amD9OkmbVkmnrxP1uyYMsMnQayCXCVpLQv4nN7bpymTNV2ZtTKWImLXW4/EaX",
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"sender_claimed_keys": {
|
||||
"ed25519": "dV0TIhhkToXpL+gZLo+zXDHJfw7MWYxpg80cynIQDv0"
|
||||
"ed25519": "zBdpQwWYyz1MkZuEUhXqcdMfUNN/B9psLFDDDTJOg64"
|
||||
},
|
||||
"forwarding_curve25519_key_chain": []
|
||||
};
|
||||
|
||||
/** Signed OTKs, returned by `POST /keys/claim` */
|
||||
export const BOB_ONE_TIME_KEYS = {
|
||||
"@bob:xyz": {
|
||||
"bob_device": {
|
||||
"signed_curve25519:AAAAHQ": {
|
||||
"key": "j3fR3HemM16M7CWhoI4Sk5ZsdmdfQHsKL1xuSft6MSw",
|
||||
"signatures": {
|
||||
"@bob:xyz": {
|
||||
"ed25519:bob_device": "dlZc9VA/hP980Mxvu9qwi0qJx8VK7sADGOM48CE01YM7K/Mbty9lis/QjtQAWqDg371QyynVRjEzt9qj7eSFCg"
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
/** The key from BOB_MEGOLM_SESSION_DATA, encrypted for backup using `m.megolm_backup.v1.curve25519-aes-sha2` algorithm*/
|
||||
export const BOB_CURVE25519_KEY_BACKUP_DATA: IKeyBackupSession = {
|
||||
"first_message_index": 1,
|
||||
"forwarded_count": 0,
|
||||
"is_verified": false,
|
||||
"session_data": {
|
||||
"ciphertext": "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",
|
||||
"ephemeral": "oO0VX84OUIzm2i/12zAhTWOZT5IFRH5mXaKZ8fXkCgU",
|
||||
"mac": "lEfHlqfJQwU"
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
Reference in New Issue
Block a user