1 files changed, 100 insertions, 0 deletions
diff --git a/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESedeKeySpec.java b/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESedeKeySpec.java
new file mode 100644
index 000000000..edfcd3c43
--- /dev/null
+++ b/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESedeKeySpec.java
@@ -0,0 +1,100 @@
+package javax.crypto.spec;
+
+import java.security.InvalidKeyException;
+import java.security.spec.KeySpec;
+
+/**
+ * This class specifies a DES-EDE ("triple-DES") key.
+ */
+public class DESedeKeySpec
+    implements KeySpec
+{
+    public static final int DES_EDE_KEY_LEN = 24;
+
+    private byte[]  keyBytes = new byte[DES_EDE_KEY_LEN];
+
+    /**
+     * Uses the first 24 bytes in <code>key</code> as the DES-EDE key.
+     * <p>
+     * The bytes that constitute the DES-EDE key are those between
+     * <code>key[0]</code> and <code>key[23]</code> inclusive
+     *
+     * @param key the buffer with the DES-EDE key material.
+     * @exception InvalidKeyException if the given key material is shorter
+     * than 24 bytes.
+     */
+    public DESedeKeySpec(
+        byte[]  key)
+        throws InvalidKeyException
+    {
+        if (key.length < DES_EDE_KEY_LEN)
+        {
+            throw new InvalidKeyException("DESede key material too short in construction");
+        }
+
+        System.arraycopy(key, 0, keyBytes, 0, keyBytes.length);
+    }
+
+    /**
+     * Uses the first 24 bytes in <code>key</code>, beginning at
+     * <code>offset</code> inclusive, as the DES-EDE key.
+     * <p>
+     * The bytes that constitute the DES-EDE key are those between
+     * <code>key[offset]</code> and <code>key[offset+23]</code> inclusive.
+     * @param key the buffer with the DES-EDE key material.
+     * @param offset the offset in <code>key</code>, where the DES-EDE key
+     * material starts.
+     * @exception InvalidKeyException if the given key material, starting at
+     * <code>offset</code> inclusive, is shorter than 24 bytes
+     */
+    public DESedeKeySpec(
+        byte[]  key,
+        int     offset)
+    throws InvalidKeyException
+    {
+        if ((key.length - offset) < DES_EDE_KEY_LEN)
+        {
+            throw new InvalidKeyException("DESede key material too short in construction");
+        }
+
+        System.arraycopy(key, 0, keyBytes, 0, keyBytes.length);
+    }
+
+    /**
+     * Returns the DES-EDE key.
+     *
+     * @return the DES-EDE key
+     */
+    public byte[] getKey()
+    {
+        byte[]  tmp = new byte[DES_EDE_KEY_LEN];
+
+        System.arraycopy(keyBytes, 0, tmp, 0, tmp.length);
+
+        return tmp;
+    }
+
+    /**
+     * Checks if the given DES-EDE key, starting at <code>offset</code>
+     * inclusive, is parity-adjusted.
+     *
+     * @return true if the given DES-EDE key is parity-adjusted, false
+     * otherwise
+     * @exception InvalidKeyException if the given key material, starting at
+     * <code>offset</code> inclusive, is shorter than 24 bytes
+     */
+    public static boolean isParityAdjusted(
+        byte[]  key,
+        int     offset)
+    throws InvalidKeyException
+    {
+        if ((key.length - offset) < DES_EDE_KEY_LEN)
+        {
+            throw new InvalidKeyException("key material too short in DESedeKeySpec.isParityAdjusted");
+        }
+
+        return (DESKeySpec.isParityAdjusted(key, offset)
+                && DESKeySpec.isParityAdjusted(key, offset + 8)
+                && DESKeySpec.isParityAdjusted(key, offset + 16));
+    }
+}