Signal/Signal-Server
1
0
Fork 0
mirror of https://github.com/signalapp/Signal-Server synced 2026-04-20 07:08:05 +01:00
Code Issues Packages Projects Releases Wiki Activity

Let server generate copyToMedia IVs

Browse Source 
We include the IV in the encrypted payload, so we can let the server
choose them instead of the client
This commit is contained in:
Ravi Khadiwala
2024-10-28 17:28:23 -05:00
committed by Jon Chambers
parent a5f60b1522
commit f2cb04817b
6 changed files with 22 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
service/src/main/java/org/whispersystems/textsecuregcm/backup/Cdn3RemoteStorageManager.java
View File

@@ -19,7 +19,6 @@ import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import javax.annotation.Nullable;
import javax.validation.constraints.NotNull;
@@ -129,7 +128,7 @@ public class Cdn3RemoteStorageManager implements RemoteStorageManager {
* Serialized copy request for cdn3 storage manager
*/
record Cdn3CopyRequest(
String encryptionKey, String hmacKey, String iv,
String encryptionKey, String hmacKey,
SourceDescriptor source, int expectedSourceLength,
String dst) {
@@ -137,7 +136,6 @@ public class Cdn3RemoteStorageManager implements RemoteStorageManager {
String dst) {
this(Base64.getEncoder().encodeToString(parameters.aesEncryptionKey().getEncoded()),
Base64.getEncoder().encodeToString(parameters.hmacSHA256Key().getEncoded()),
Base64.getEncoder().encodeToString(parameters.iv().getIV()),
source, expectedSourceLength, dst);
}

12
service/src/main/java/org/whispersystems/textsecuregcm/backup/MediaEncryptionParameters.java
View File

@@ -1,24 +1,22 @@
package org.whispersystems.textsecuregcm.backup;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public record MediaEncryptionParameters(
SecretKeySpec aesEncryptionKey,
SecretKeySpec hmacSHA256Key,
IvParameterSpec iv) {
SecretKeySpec hmacSHA256Key) {
public MediaEncryptionParameters(byte[] encryptionKey, byte[] macKey, byte[] iv) {
public MediaEncryptionParameters(byte[] encryptionKey, byte[] macKey) {
this(
new SecretKeySpec(encryptionKey, "AES"),
new SecretKeySpec(macKey, "HmacSHA256"),
new IvParameterSpec(iv));
new SecretKeySpec(macKey, "HmacSHA256"));
}
public int outputSize(final int inputSize) {
// AES-256 has 16-byte block size, and always adds a block if the plaintext is a multiple of the block size
final int numBlocks = (inputSize + 16) / 16;
// 16-byte IV will be generated and prepended to the ciphertext
// IV + AES-256 encrypted data + HmacSHA256
return this.iv().getIV().length + (numBlocks * 16) + 32;
return 16 + (numBlocks * 16) + 32;
}
}