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//
// Copyright 2020-2021 Signal Messenger, LLC.
// SPDX-License-Identifier: AGPL-3.0-only
//
package org.signal.zkgroup.groups;
import java.nio.ByteBuffer;
import java.security.SecureRandom;
import java.util.UUID;
import org.signal.zkgroup.InvalidInputException;
import org.signal.zkgroup.VerificationFailedException;
import org.signal.client.internal.Native;
import org.signal.zkgroup.profiles.ProfileKey;
import static org.signal.zkgroup.internal.Constants.RANDOM_LENGTH;
public class ClientZkGroupCipher {
private final GroupSecretParams groupSecretParams;
public ClientZkGroupCipher(GroupSecretParams groupSecretParams) {
this.groupSecretParams = groupSecretParams;
}
public UuidCiphertext encryptUuid(UUID uuid) {
byte[] newContents = Native.GroupSecretParams_EncryptUuid(groupSecretParams.getInternalContentsForJNI(), uuid);
try {
return new UuidCiphertext(newContents);
} catch (InvalidInputException e) {
throw new AssertionError(e);
}
}
public UUID decryptUuid(UuidCiphertext uuidCiphertext) throws VerificationFailedException {
return Native.GroupSecretParams_DecryptUuid(groupSecretParams.getInternalContentsForJNI(), uuidCiphertext.getInternalContentsForJNI());
}
public ProfileKeyCiphertext encryptProfileKey(ProfileKey profileKey, UUID uuid) {
byte[] newContents = Native.GroupSecretParams_EncryptProfileKey(groupSecretParams.getInternalContentsForJNI(), profileKey.getInternalContentsForJNI(), uuid);
try {
return new ProfileKeyCiphertext(newContents);
} catch (InvalidInputException e) {
throw new AssertionError(e);
}
}
public ProfileKey decryptProfileKey(ProfileKeyCiphertext profileKeyCiphertext, UUID uuid) throws VerificationFailedException {
byte[] newContents = Native.GroupSecretParams_DecryptProfileKey(groupSecretParams.getInternalContentsForJNI(), profileKeyCiphertext.getInternalContentsForJNI(), uuid);
try {
return new ProfileKey(newContents);
} catch (InvalidInputException e) {
throw new AssertionError(e);
}
}
public byte[] encryptBlob(byte[] plaintext) throws VerificationFailedException {
return encryptBlob(new SecureRandom(), plaintext);
}
public byte[] encryptBlob(SecureRandom secureRandom, byte[] plaintext) throws VerificationFailedException {
byte[] random = new byte[RANDOM_LENGTH];
secureRandom.nextBytes(random);
return Native.GroupSecretParams_EncryptBlobWithPaddingDeterministic(groupSecretParams.getInternalContentsForJNI(), random, plaintext, 0);
}
public byte[] decryptBlob(byte[] blobCiphertext) throws VerificationFailedException {
return Native.GroupSecretParams_DecryptBlobWithPadding(groupSecretParams.getInternalContentsForJNI(), blobCiphertext);
}
}
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