1 files changed, 68 insertions, 0 deletions
diff --git a/src/lib/pk_pad/emsa.h b/src/lib/pk_pad/emsa.h
new file mode 100644
index 000000000..5db01ec12
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+++ b/src/lib/pk_pad/emsa.h
@@ -0,0 +1,68 @@
+/*
+* EMSA Classes
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_PUBKEY_EMSA_H__
+#define BOTAN_PUBKEY_EMSA_H__
+
+#include <botan/secmem.h>
+#include <botan/rng.h>
+
+namespace Botan {
+
+/**
+* Encoding Method for Signatures, Appendix
+*/
+class BOTAN_DLL EMSA
+   {
+   public:
+      /**
+      * Add more data to the signature computation
+      * @param input some data
+      * @param length length of input in bytes
+      */
+      virtual void update(const byte input[], size_t length) = 0;
+
+      /**
+      * @return raw hash
+      */
+      virtual secure_vector<byte> raw_data() = 0;
+
+      /**
+      * Return the encoding of a message
+      * @param msg the result of raw_data()
+      * @param output_bits the desired output bit size
+      * @param rng a random number generator
+      * @return encoded signature
+      */
+      virtual secure_vector<byte> encoding_of(const secure_vector<byte>& msg,
+                                             size_t output_bits,
+                                             RandomNumberGenerator& rng) = 0;
+
+      /**
+      * Verify the encoding
+      * @param coded the received (coded) message representative
+      * @param raw the computed (local, uncoded) message representative
+      * @param key_bits the size of the key in bits
+      * @return true if coded is a valid encoding of raw, otherwise false
+      */
+      virtual bool verify(const secure_vector<byte>& coded,
+                          const secure_vector<byte>& raw,
+                          size_t key_bits) = 0;
+      virtual ~EMSA() {}
+   };
+
+/**
+* Factory method for EMSA (message-encoding methods for signatures
+* with appendix) objects
+* @param algo_spec the name of the EME to create
+* @return pointer to newly allocated object of that type
+*/
+BOTAN_DLL EMSA* get_emsa(const std::string& algo_spec);
+
+}
+
+#endif