1 files changed, 76 insertions, 0 deletions
diff --git a/src/lib/misc/tss/tss.h b/src/lib/misc/tss/tss.h
new file mode 100644
index 000000000..09a5dbe19
--- /dev/null
+++ b/src/lib/misc/tss/tss.h
@@ -0,0 +1,76 @@
+/*
+* RTSS (threshold secret sharing)
+* (C) 2009 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_RTSS_H__
+#define BOTAN_RTSS_H__
+
+#include <botan/secmem.h>
+#include <botan/hash.h>
+#include <botan/rng.h>
+#include <vector>
+
+namespace Botan {
+
+/**
+* A split secret, using the format from draft-mcgrew-tss-03
+*/
+class BOTAN_DLL RTSS_Share
+   {
+   public:
+      /**
+      * @param M the number of shares needed to reconstruct
+      * @param N the number of shares generated
+      * @param secret the secret to split
+      * @param secret_len the length of the secret
+      * @param identifier the 16 byte share identifier
+      * @param rng the random number generator to use
+      */
+      static std::vector<RTSS_Share>
+         split(byte M, byte N,
+               const byte secret[], u16bit secret_len,
+               const byte identifier[16],
+               RandomNumberGenerator& rng);
+
+      /**
+      * @param shares the list of shares
+      */
+      static secure_vector<byte>
+        reconstruct(const std::vector<RTSS_Share>& shares);
+
+      RTSS_Share() {}
+
+      /**
+      * @param hex_input the share encoded in hexadecimal
+      */
+      RTSS_Share(const std::string& hex_input);
+
+      /**
+      * @return hex representation
+      */
+      std::string to_string() const;
+
+      /**
+      * @return share identifier
+      */
+      byte share_id() const;
+
+      /**
+      * @return size of this share in bytes
+      */
+      size_t size() const { return contents.size(); }
+
+      /**
+      * @return if this TSS share was initialized or not
+      */
+      bool initialized() const { return (contents.size() > 0); }
+   private:
+      secure_vector<byte> contents;
+   };
+
+}
+
+#endif