Add spongy castle sources to libraries folder

libraries/spongycastle/jce/src/main/java/javax/crypto/interfaces/DHKey.java

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+package javax.crypto.interfaces;
+
+import javax.crypto.spec.DHParameterSpec;
+
+/**
+ * The interface to a Diffie-Hellman key.
+ *
+ * @see DHParameterSpec
+ * @see DHPublicKey
+ * @see DHPrivateKey
+ */
+public abstract interface DHKey
+{
+    /**
+     * Returns the key parameters.
+     *
+     * @return the key parameters
+     */
+    public DHParameterSpec getParams();
+}

libraries/spongycastle/jce/src/main/java/javax/crypto/interfaces/DHPrivateKey.java

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+package javax.crypto.interfaces;
+
+import java.math.BigInteger;
+import java.security.PrivateKey;
+
+/**
+ * The interface to a Diffie-Hellman private key.
+ *
+ * @see DHKey
+ * @see DHPublicKey
+ */
+public abstract interface DHPrivateKey
+    extends DHKey, PrivateKey
+{
+    /**
+     * Returns the private value, <code>x</code>.
+     *
+     * @return the private value, <code>x</code>
+     */
+    public BigInteger getX();
+}

libraries/spongycastle/jce/src/main/java/javax/crypto/interfaces/DHPublicKey.java

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+package javax.crypto.interfaces;
+
+import java.math.BigInteger;
+import java.security.PublicKey;
+
+/**
+ * The interface to a Diffie-Hellman public key.
+ *
+ * @see DHKey
+ * @see DHPrivateKey
+ */
+public abstract interface DHPublicKey
+    extends DHKey, PublicKey
+{
+    /**
+     * Returns the public value, <code>y</code>.
+     *
+     * @return the public value, <code>y</code>
+     */
+    public BigInteger getY();
+}

libraries/spongycastle/jce/src/main/java/javax/crypto/interfaces/PBEKey.java

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+package javax.crypto.interfaces;
+
+import javax.crypto.SecretKey;
+
+/**
+ * The interface to a PBE key.
+ * 
+ * @see PBEKeySpec, SecretKey
+ */
+public interface PBEKey
+    extends SecretKey
+{
+    /**
+     * Returns the password.
+     * 
+     * Note: this method should return a copy of the password. It is the
+     * caller's responsibility to zero out the password information after it is
+     * no longer needed.
+     * 
+     * @return the password.
+     */
+    public char[] getPassword();
+
+    /**
+     * Returns the salt or null if not specified.
+     * 
+     * Note: this method should return a copy of the salt. It is the caller's
+     * responsibility to zero out the salt information after it is no longer
+     * needed.
+     * 
+     * @return the salt.
+     */
+    public byte[] getSalt();
+
+    /**
+     * Returns the iteration count or 0 if not specified.
+     * 
+     * @return the iteration count.
+     */
+    public int getIterationCount();
+}