chibenwa commented on a change in pull request #342:
URL: https://github.com/apache/james-project/pull/342#discussion_r602885931
##########
File path:
server/blob/blob-aes/src/main/java/org/apache/james/blob/aes/AESBlobStoreDAO.java
##########
@@ -41,71 +36,54 @@
import com.github.fge.lambdas.Throwing;
import com.google.common.base.Preconditions;
import com.google.common.io.ByteSource;
-import com.google.crypto.tink.Aead;
-import com.google.crypto.tink.aead.AeadConfig;
-import com.google.crypto.tink.subtle.AesGcmJce;
+import com.google.common.io.FileBackedOutputStream;
+import com.google.crypto.tink.subtle.AesGcmHkdfStreaming;
import reactor.core.publisher.Mono;
-import reactor.core.scheduler.Schedulers;
public class AESBlobStoreDAO implements BlobStoreDAO {
- private static final byte[] EMPTY_ASSOCIATED_DATA = new byte[0];
- private static final int PBKDF2_ITERATIONS = 65536;
- private static final int KEY_SIZE = 256;
- private static final String SECRET_KEY_FACTORY_ALGORITHM =
"PBKDF2WithHmacSHA256";
-
private final BlobStoreDAO underlying;
- private final Aead aead;
+ private final AesGcmHkdfStreaming streamingAead;
public AESBlobStoreDAO(BlobStoreDAO underlying, CryptoConfig cryptoConfig)
{
this.underlying = underlying;
-
- try {
- AeadConfig.register();
-
- SecretKey secretKey = deriveKey(cryptoConfig);
- aead = new AesGcmJce(secretKey.getEncoded());
- } catch (GeneralSecurityException e) {
- throw new RuntimeException("Error while starting AESPayloadCodec",
e);
- }
+ this.streamingAead =
PBKDF2StreamingAeadFactory.newAesGcmHkdfStreaming(cryptoConfig);
}
- private static SecretKey deriveKey(CryptoConfig cryptoConfig) throws
NoSuchAlgorithmException, InvalidKeySpecException {
- byte[] saltBytes = cryptoConfig.salt();
- SecretKeyFactory skf =
SecretKeyFactory.getInstance(SECRET_KEY_FACTORY_ALGORITHM);
- PBEKeySpec spec = new PBEKeySpec(cryptoConfig.password(), saltBytes,
PBKDF2_ITERATIONS, KEY_SIZE);
- return skf.generateSecret(spec);
- }
-
- public byte[] encrypt(byte[] input) {
- try {
- return aead.encrypt(input, EMPTY_ASSOCIATED_DATA);
- } catch (GeneralSecurityException e) {
+ public FileBackedOutputStream encrypt(InputStream input) {
+ try (FileBackedOutputStream encryptedContent = new
FileBackedOutputStream(100 * 1024)) {
+ OutputStream outputStream =
streamingAead.newEncryptingStream(encryptedContent,
PBKDF2StreamingAeadFactory.EMPTY_ASSOCIATED_DATA);
+ input.transferTo(outputStream);
+ outputStream.close();
+ return encryptedContent;
+ } catch (GeneralSecurityException | IOException e) {
throw new RuntimeException("Unable to build payload for object
storage, failed to encrypt", e);
}
}
- public byte[] decrypt(byte[] ciphertext) throws IOException {
+ public InputStream decrypt(InputStream ciphertext) throws IOException {
try {
- return aead.decrypt(ciphertext, EMPTY_ASSOCIATED_DATA);
+ return streamingAead.newDecryptingStream(ciphertext,
PBKDF2StreamingAeadFactory.EMPTY_ASSOCIATED_DATA);
Review comment:
To be really honest, this design only makes sense when coupled with the
underlying S3BlobStoreDAO design.
But I feel stuck using it as we miss an `InputStream -> InputSream`
efficient AES solution...
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