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8143925: Enhancing CounterMode.crypt() for AES

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Add intrinsic for CounterMode.crypt() to leverage the parallel nature of AES in Counter(CTR) Mode.

Reviewed-by: kvn, ascarpino
This commit is contained in:
Kishor Kharbas 2015-12-28 22:28:49 -08:00 committed by Vladimir Kozlov
parent 32aff4400c
commit 7763f8d12d
1 changed files with 31 additions and 1 deletions
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32
jdk/src/java.base/share/classes/com/sun/crypto/provider/CounterMode.java
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@ -26,7 +26,9 @@
package com.sun.crypto.provider;
import java.security.InvalidKeyException;
import java.util.Objects;
import jdk.internal.HotSpotIntrinsicCandidate;
/**
* This class represents ciphers in counter (CTR) mode.
@ -138,7 +140,7 @@ final class CounterMode extends FeedbackCipher {
* <code>cipherOffset</code>.
*
* @param in the buffer with the input data to be encrypted
* @param inOffset the offset in <code>plain</code>
* @param inOff the offset in <code>plain</code>
* @param len the length of the input data
* @param out the buffer for the result
* @param outOff the offset in <code>cipher</code>
@ -170,6 +172,15 @@ final class CounterMode extends FeedbackCipher {
* are encrypted on demand.
*/
private int crypt(byte[] in, int inOff, int len, byte[] out, int outOff) {
cryptBlockCheck(in, inOff, len);
cryptBlockCheck(out, outOff, len);
return implCrypt(in, inOff, len, out, outOff);
}
// Implementation of crpyt() method. Possibly replaced with a compiler intrinsic.
@HotSpotIntrinsicCandidate
private int implCrypt(byte[] in, int inOff, int len, byte[] out, int outOff) {
int result = len;
while (len-- > 0) {
if (used >= blockSize) {
@ -181,4 +192,23 @@ final class CounterMode extends FeedbackCipher {
}
return result;
}
// Used to perform all checks required by the Java semantics
// (i.e., null checks and bounds checks) on the input parameters to crypt().
// Normally, the Java Runtime performs these checks, however, as crypt() is
// possibly replaced with compiler intrinsic, the JDK performs the
// required checks instead.
// Does not check accesses to class-internal (private) arrays.
private static void cryptBlockCheck(byte[] array, int offset, int len) {
Objects.requireNonNull(array);
if (offset < 0 || len < 0 || offset >= array.length) {
throw new ArrayIndexOutOfBoundsException(offset);
}
int largestIndex = offset + len - 1;
if (largestIndex < 0 || largestIndex >= array.length) {
throw new ArrayIndexOutOfBoundsException(largestIndex);
}
}
}