[
https://issues.apache.org/jira/browse/ORC-251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16542237#comment-16542237
]
ASF GitHub Bot commented on ORC-251:
------------------------------------
Github user prasanthj commented on a diff in the pull request:
https://github.com/apache/orc/pull/278#discussion_r202187998
--- Diff: java/core/src/java/org/apache/orc/impl/InStream.java ---
@@ -173,33 +203,208 @@ private static ByteBuffer allocateBuffer(int size,
boolean isDirect) {
}
}
+ /**
+ * Manage the state of the decryption, including the ability to seek.
+ */
+ static class EncryptionState {
+ private final String name;
+ private final EncryptionAlgorithm algorithm;
+ private final Key key;
+ private final byte[] iv;
+ private final Cipher cipher;
+ private ByteBuffer decrypted;
+
+ EncryptionState(String name, StreamOptions options) {
+ this.name = name;
+ algorithm = options.algorithm;
+ key = options.key;
+ iv = options.iv;
+ cipher = algorithm.createCipher();
+ }
+
+ /**
+ * We are seeking to a new range, so update the cipher to change the IV
+ * to match. This code assumes that we only support encryption in CTR
mode.
+ * @param offset where we are seeking to in the stream
+ */
+ void changeIv(long offset) {
+ int blockSize = cipher.getBlockSize();
+ long encryptionBlocks = offset / blockSize;
--- End diff --
Add +1 if there is extra?
> Modify InStream and OutStream to optionally encrypt data
> --------------------------------------------------------
>
> Key: ORC-251
> URL: https://issues.apache.org/jira/browse/ORC-251
> Project: ORC
> Issue Type: Sub-task
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Priority: Major
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
