1 files changed, 104 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/misc/tss/tss.h b/comm/third_party/botan/src/lib/misc/tss/tss.h
new file mode 100644
index 0000000000..89848c43e6
--- /dev/null
+++ b/comm/third_party/botan/src/lib/misc/tss/tss.h
@@ -0,0 +1,104 @@
+/*
+* RTSS (threshold secret sharing)
+* (C) 2009,2018 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 <string>
+#include <vector>
+
+namespace Botan {
+
+class RandomNumberGenerator;
+
+/**
+* A split secret, using the format from draft-mcgrew-tss-03
+*/
+class BOTAN_PUBLIC_API(2,0) RTSS_Share final
+   {
+   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(uint8_t M, uint8_t N,
+               const uint8_t secret[], uint16_t secret_len,
+               const uint8_t identifier[16],
+               RandomNumberGenerator& rng);
+
+      /**
+      * @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 share identifier
+      * @param hash_fn the hash function to use for a checksum ("None", "SHA-1", "SHA-256")
+      * @param rng the random number generator to use
+      */
+      static std::vector<RTSS_Share>
+         split(uint8_t M, uint8_t N,
+               const uint8_t secret[], uint16_t secret_len,
+               const std::vector<uint8_t>& identifier,
+               const std::string& hash_fn,
+               RandomNumberGenerator& rng);
+
+      /**
+      * @param shares the list of shares
+      */
+      static secure_vector<uint8_t>
+        reconstruct(const std::vector<RTSS_Share>& shares);
+
+      RTSS_Share() = default;
+
+      /**
+      * @param hex_input the share encoded in hexadecimal
+      */
+      explicit RTSS_Share(const std::string& hex_input);
+
+      /**
+      * @param data the shared data
+      * @param len the length of data
+      */
+      RTSS_Share(const uint8_t data[], size_t len);
+
+      /**
+      * @return binary representation
+      */
+      const secure_vector<uint8_t>& data() const { return m_contents; }
+
+      /**
+      * @return hex representation
+      */
+      std::string to_string() const;
+
+      /**
+      * @return share identifier
+      */
+      uint8_t share_id() const;
+
+      /**
+      * @return size of this share in bytes
+      */
+      size_t size() const { return m_contents.size(); }
+
+      /**
+      * @return if this TSS share was initialized or not
+      */
+      bool initialized() const { return (m_contents.size() > 0); }
+   private:
+      secure_vector<uint8_t> m_contents;
+   };
+
+}
+
+#endif