2002/03/21 01:19:32

[org.ibex.core.git] / src / org / bouncycastle / crypto / CipherKeyGenerator.java

diff --git a/src/org/bouncycastle/crypto/CipherKeyGenerator.java b/src/org/bouncycastle/crypto/CipherKeyGenerator.java
new file mode 100644 (file)
index 0000000..451f8e8
--- /dev/null
+++ b/src/org/bouncycastle/crypto/CipherKeyGenerator.java
@@ -0,0 +1,38 @@
+package org.bouncycastle.crypto;
+
+import java.security.SecureRandom;
+
+/**
+ * The base class for symmetric, or secret, cipher key generators.
+ */
+public class CipherKeyGenerator
+{
+    protected SecureRandom  random;
+    protected int           strength;
+
+    /**
+     * initialise the key generator.
+     *
+     * @param param the parameters to be used for key generation
+     */
+    public void init(
+        KeyGenerationParameters param)
+    {
+        this.random = param.getRandom();
+        this.strength = (param.getStrength() + 7) / 8;
+    }
+
+    /**
+     * generate a secret key.
+     *
+     * @return a byte array containing the key value.
+     */
+    public byte[] generateKey()
+    {
+        byte[]  key = new byte[strength];
+
+        random.nextBytes(key);
+
+        return key;
+    }
+}