1 files changed, 48 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/DESKeyGenerator.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/DESKeyGenerator.java
new file mode 100644
index 000000000..ef6894f52
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/DESKeyGenerator.java
@@ -0,0 +1,48 @@
+package org.spongycastle.crypto.generators;
+
+import org.spongycastle.crypto.CipherKeyGenerator;
+import org.spongycastle.crypto.KeyGenerationParameters;
+import org.spongycastle.crypto.params.DESParameters;
+
+public class DESKeyGenerator
+    extends CipherKeyGenerator
+{
+    /**
+     * initialise the key generator - if strength is set to zero
+     * the key generated will be 64 bits in size, otherwise
+     * strength can be 64 or 56 bits (if you don't count the parity bits).
+     *
+     * @param param the parameters to be used for key generation
+     */
+    public void init(
+        KeyGenerationParameters param)
+    {
+        super.init(param);
+
+        if (strength == 0 || strength == (56 / 8))
+        {
+            strength = DESParameters.DES_KEY_LENGTH;
+        }
+        else if (strength != DESParameters.DES_KEY_LENGTH)
+        {
+            throw new IllegalArgumentException("DES key must be "
+                    + (DESParameters.DES_KEY_LENGTH * 8)
+                    + " bits long.");
+        }
+    }
+
+    public byte[] generateKey()
+    {
+        byte[]  newKey = new byte[DESParameters.DES_KEY_LENGTH];
+
+        do
+        {
+            random.nextBytes(newKey);
+
+            DESParameters.setOddParity(newKey);
+        }
+        while (DESParameters.isWeakKey(newKey, 0));
+
+        return newKey;
+    }
+}