1 files changed, 56 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/DESedeKeyGenerator.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/DESedeKeyGenerator.java
new file mode 100644
index 000000000..c22cc172d
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/generators/DESedeKeyGenerator.java
@@ -0,0 +1,56 @@
+package org.spongycastle.crypto.generators;
+
+import org.spongycastle.crypto.KeyGenerationParameters;
+import org.spongycastle.crypto.params.DESedeParameters;
+
+public class DESedeKeyGenerator
+    extends DESKeyGenerator
+{
+    /**
+     * initialise the key generator - if strength is set to zero
+     * the key generated will be 192 bits in size, otherwise
+     * strength can be 128 or 192 (or 112 or 168 if you don't count
+     * parity bits), depending on whether you wish to do 2-key or 3-key
+     * triple DES.
+     *
+     * @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;
+
+        if (strength == 0 || strength == (168 / 8))
+        {
+            strength = DESedeParameters.DES_EDE_KEY_LENGTH;
+        }
+        else if (strength == (112 / 8))
+        {
+            strength = 2 * DESedeParameters.DES_KEY_LENGTH;
+        }
+        else if (strength != DESedeParameters.DES_EDE_KEY_LENGTH
+                && strength != (2 * DESedeParameters.DES_KEY_LENGTH))
+        {
+            throw new IllegalArgumentException("DESede key must be "
+                + (DESedeParameters.DES_EDE_KEY_LENGTH * 8) + " or "
+                + (2 * 8 * DESedeParameters.DES_KEY_LENGTH)
+                + " bits long.");
+        }
+    }
+
+    public byte[] generateKey()
+    {
+        byte[]  newKey = new byte[strength];
+
+        do
+        {
+            random.nextBytes(newKey);
+
+            DESedeParameters.setOddParity(newKey);
+        }
+        while (DESedeParameters.isWeakKey(newKey, 0, newKey.length));
+
+        return newKey;
+    }
+}