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diff --git a/src/lib/constructs/srp6/srp6.h b/src/lib/constructs/srp6/srp6.h
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index 000000000..6f3960be1
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+++ b/src/lib/constructs/srp6/srp6.h
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+/*
+* SRP-6a (RFC 5054 compatatible)
+* (C) 2011,2012 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_RFC5054_SRP6_H__
+#define BOTAN_RFC5054_SRP6_H__
+
+#include <botan/bigint.h>
+#include <botan/hash.h>
+#include <botan/rng.h>
+#include <botan/symkey.h>
+#include <string>
+
+namespace Botan {
+
+/**
+* SRP6a Client side
+* @param username the username we are attempting login for
+* @param password the password we are attempting to use
+* @param group_id specifies the shared SRP group
+* @param hash_id specifies a secure hash function
+* @param salt is the salt value sent by the server
+* @param B is the server's public value
+* @param rng is a random number generator
+*
+* @return (A,K) the client public key and the shared secret key
+*/
+std::pair<BigInt,SymmetricKey>
+BOTAN_DLL srp6_client_agree(const std::string& username,
+                            const std::string& password,
+                            const std::string& group_id,
+                            const std::string& hash_id,
+                            const std::vector<byte>& salt,
+                            const BigInt& B,
+                            RandomNumberGenerator& rng);
+
+/**
+* Generate a new SRP-6 verifier
+* @param identifier a username or other client identifier
+* @param password the secret used to authenticate user
+* @param salt a randomly chosen value, at least 128 bits long
+* @param group_id specifies the shared SRP group
+* @param hash_id specifies a secure hash function
+*/
+BigInt BOTAN_DLL generate_srp6_verifier(const std::string& identifier,
+                                        const std::string& password,
+                                        const std::vector<byte>& salt,
+                                        const std::string& group_id,
+                                        const std::string& hash_id);
+
+/**
+* Return the group id for this SRP param set, or else thrown an
+* exception
+* @param N the group modulus
+* @param g the group generator
+* @return group identifier
+*/
+std::string BOTAN_DLL srp6_group_identifier(const BigInt& N, const BigInt& g);
+
+/**
+* Represents a SRP-6a server session
+*/
+class BOTAN_DLL SRP6_Server_Session
+   {
+   public:
+      /**
+      * Server side step 1
+      * @param v the verification value saved from client registration
+      * @param group_id the SRP group id
+      * @param hash_id the SRP hash in use
+      * @param rng a random number generator
+      * @return SRP-6 B value
+      */
+      BigInt step1(const BigInt& v,
+                   const std::string& group_id,
+                   const std::string& hash_id,
+                   RandomNumberGenerator& rng);
+
+      /**
+      * Server side step 2
+      * @param A the client's value
+      * @return shared symmetric key
+      */
+      SymmetricKey step2(const BigInt& A);
+
+   private:
+      std::string hash_id;
+      BigInt B, b, v, S, p;
+      size_t p_bytes;
+   };
+
+}
+
+#endif