diff options
Diffstat (limited to 'bcprov/src/main/java/org/bouncycastle/crypto/prng/ReversedWindowGenerator.java')
-rw-r--r-- | bcprov/src/main/java/org/bouncycastle/crypto/prng/ReversedWindowGenerator.java | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/prng/ReversedWindowGenerator.java b/bcprov/src/main/java/org/bouncycastle/crypto/prng/ReversedWindowGenerator.java deleted file mode 100644 index fbb2639..0000000 --- a/bcprov/src/main/java/org/bouncycastle/crypto/prng/ReversedWindowGenerator.java +++ /dev/null @@ -1,111 +0,0 @@ -package org.bouncycastle.crypto.prng; - -/** - * Takes bytes generated by an underling RandomGenerator and reverses the order in - * each small window (of configurable size). - * <p> - * Access to internals is synchronized so a single one of these can be shared. - * </p> - */ -public class ReversedWindowGenerator - implements RandomGenerator -{ - private final RandomGenerator generator; - - private byte[] window; - private int windowCount; - - public ReversedWindowGenerator( - RandomGenerator generator, - int windowSize) - { - if (generator == null) - { - throw new IllegalArgumentException("generator cannot be null"); - } - if (windowSize < 2) - { - throw new IllegalArgumentException("windowSize must be at least 2"); - } - - this.generator = generator; - this.window = new byte[windowSize]; - } - - /** - * Add more seed material to the generator. - * - * @param seed a byte array to be mixed into the generator's state. - */ - public void addSeedMaterial( - byte[] seed) - { - synchronized (this) - { - windowCount = 0; - generator.addSeedMaterial(seed); - } - } - - /** - * Add more seed material to the generator. - * - * @param seed a long value to be mixed into the generator's state. - */ - public void addSeedMaterial( - long seed) - { - synchronized (this) - { - windowCount = 0; - generator.addSeedMaterial(seed); - } - } - - /** - * Fill bytes with random values. - * - * @param bytes byte array to be filled. - */ - public void nextBytes( - byte[] bytes) - { - doNextBytes(bytes, 0, bytes.length); - } - - /** - * Fill part of bytes with random values. - * - * @param bytes byte array to be filled. - * @param start index to start filling at. - * @param len length of segment to fill. - */ - public void nextBytes( - byte[] bytes, - int start, - int len) - { - doNextBytes(bytes, start, len); - } - - private void doNextBytes( - byte[] bytes, - int start, - int len) - { - synchronized (this) - { - int done = 0; - while (done < len) - { - if (windowCount < 1) - { - generator.nextBytes(window, 0, window.length); - windowCount = window.length; - } - - bytes[start + done++] = window[--windowCount]; - } - } - } -} |