1 files changed, 36 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/DSA.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/DSA.java
new file mode 100644
index 000000000..7243ddd94
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/DSA.java
@@ -0,0 +1,36 @@
+package org.spongycastle.crypto;
+
+import java.math.BigInteger;
+
+/**
+ * interface for classes implementing algorithms modeled similar to the Digital Signature Alorithm.
+ */
+public interface DSA
+{
+    /**
+     * initialise the signer for signature generation or signature
+     * verification.
+     *
+     * @param forSigning true if we are generating a signature, false
+     * otherwise.
+     * @param param key parameters for signature generation.
+     */
+    public void init(boolean forSigning, CipherParameters param);
+
+    /**
+     * sign the passed in message (usually the output of a hash function).
+     *
+     * @param message the message to be signed.
+     * @return two big integers representing the r and s values respectively.
+     */
+    public BigInteger[] generateSignature(byte[] message);
+
+    /**
+     * verify the message message against the signature values r and s.
+     *
+     * @param message the message that was supposed to have been signed.
+     * @param r the r signature value.
+     * @param s the s signature value.
+     */
+    public boolean verifySignature(byte[] message, BigInteger  r, BigInteger s);
+}