1 files changed, 45 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/crypto/AsymmetricBlockCipher.java b/core/src/main/java/org/spongycastle/crypto/AsymmetricBlockCipher.java
new file mode 100644
index 00000000..a026a69a
--- /dev/null
+++ b/core/src/main/java/org/spongycastle/crypto/AsymmetricBlockCipher.java
@@ -0,0 +1,45 @@
+package org.spongycastle.crypto;
+
+
+/**
+ * base interface that a public/private key block cipher needs
+ * to conform to.
+ */
+public interface AsymmetricBlockCipher
+{
+    /**
+     * initialise the cipher.
+     *
+     * @param forEncryption if true the cipher is initialised for 
+     *  encryption, if false for decryption.
+     * @param param the key and other data required by the cipher.
+     */
+    public void init(boolean forEncryption, CipherParameters param);
+
+    /**
+     * returns the largest size an input block can be.
+     *
+     * @return maximum size for an input block.
+     */
+    public int getInputBlockSize();
+
+    /**
+     * returns the maximum size of the block produced by this cipher.
+     *
+     * @return maximum size of the output block produced by the cipher.
+     */
+    public int getOutputBlockSize();
+
+    /**
+     * process the block of len bytes stored in in from offset inOff.
+     *
+     * @param in the input data
+     * @param inOff offset into the in array where the data starts
+     * @param len the length of the block to be processed.
+     * @return the resulting byte array of the encryption/decryption process.
+     * @exception InvalidCipherTextException data decrypts improperly.
+     * @exception DataLengthException the input data is too large for the cipher.
+     */
+    public byte[] processBlock(byte[] in, int inOff, int len)
+        throws InvalidCipherTextException;
+}