1 files changed, 55 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/pubkey/rfc6979/rfc6979.h b/comm/third_party/botan/src/lib/pubkey/rfc6979/rfc6979.h
new file mode 100644
index 0000000000..54134a682f
--- /dev/null
+++ b/comm/third_party/botan/src/lib/pubkey/rfc6979/rfc6979.h
@@ -0,0 +1,55 @@
+/*
+* RFC 6979 Deterministic Nonce Generator
+* (C) 2014,2015 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_RFC6979_GENERATOR_H_
+#define BOTAN_RFC6979_GENERATOR_H_
+
+#include <botan/bigint.h>
+#include <string>
+#include <memory>
+
+BOTAN_FUTURE_INTERNAL_HEADER(rfc6979.h)
+
+namespace Botan {
+
+class HMAC_DRBG;
+
+class BOTAN_PUBLIC_API(2,0) RFC6979_Nonce_Generator final
+   {
+   public:
+      /**
+      * Note: keeps persistent reference to order
+      */
+      RFC6979_Nonce_Generator(const std::string& hash,
+                              const BigInt& order,
+                              const BigInt& x);
+
+      ~RFC6979_Nonce_Generator();
+
+      const BigInt& nonce_for(const BigInt& m);
+   private:
+      const BigInt& m_order;
+      BigInt m_k;
+      size_t m_qlen, m_rlen;
+      std::unique_ptr<HMAC_DRBG> m_hmac_drbg;
+      secure_vector<uint8_t> m_rng_in, m_rng_out;
+   };
+
+/**
+* @param x the secret (EC)DSA key
+* @param q the group order
+* @param h the message hash already reduced mod q
+* @param hash the hash function used to generate h
+*/
+BigInt BOTAN_PUBLIC_API(2,0) generate_rfc6979_nonce(const BigInt& x,
+                                        const BigInt& q,
+                                        const BigInt& h,
+                                        const std::string& hash);
+
+}
+
+#endif