1 files changed, 43 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/Signer.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/Signer.java
new file mode 100644
index 000000000..503e12009
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/Signer.java
@@ -0,0 +1,43 @@
+package org.spongycastle.crypto;
+
+/**
+ * Generic signer interface for hash based and message recovery signers.
+ */
+public interface Signer 
+{
+    /**
+     * Initialise the signer for signing or verification.
+     * 
+     * @param forSigning true if for signing, false otherwise
+     * @param param necessary parameters.
+     */
+    public void init(boolean forSigning, CipherParameters param);
+
+    /**
+     * update the internal digest with the byte b
+     */
+    public void update(byte b);
+
+    /**
+     * update the internal digest with the byte array in
+     */
+    public void update(byte[] in, int off, int len);
+
+    /**
+     * generate a signature for the message we've been loaded with using
+     * the key we were initialised with.
+     */
+    public byte[] generateSignature()
+        throws CryptoException, DataLengthException;
+
+    /**
+     * return true if the internal state represents the signature described
+     * in the passed in array.
+     */
+    public boolean verifySignature(byte[] signature);
+    
+    /**
+     * reset the internal state
+     */
+    public void reset();
+}