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8221345: Better Poly1305 support

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Reviewed-by: apetcher, mschoene, rhalade
This commit is contained in:
Jamil Nimeh 2019-04-03 13:35:11 -07:00
parent 12802b7e8d
commit 657f017400
1 changed files with 6 additions and 3 deletions
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9
src/java.base/share/classes/com/sun/crypto/provider/ChaCha20Cipher.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -1363,8 +1363,11 @@ abstract class ChaCha20Cipher extends CipherSpi {
// Calculate and compare the tag. Only do the decryption
// if and only if the tag matches.
authFinalizeData(ctPlusTag, 0, ctLen, tag, 0);
if (Arrays.compare(ctPlusTag, ctLen, ctPlusTagLen,
tag, 0, tag.length) != 0) {
long tagCompare = ((long)asLongView.get(ctPlusTag, ctLen) ^
(long)asLongView.get(tag, 0)) |
((long)asLongView.get(ctPlusTag, ctLen + Long.BYTES) ^
(long)asLongView.get(tag, Long.BYTES));
if (tagCompare != 0) {
throw new AEADBadTagException("Tag mismatch");
}
chaCha20Transform(ctPlusTag, 0, ctLen, out, outOff);