Botan::SRP6_Server_Session Class Reference

#include <srp6.h>

Public Member Functions
BigInt	step1 (const BigInt &v, const std::string &group_id, const std::string &hash_id, RandomNumberGenerator &rng)
SymmetricKey	step2 (const BigInt &A)

Detailed Description

Represents a SRP-6a server session

Definition at line 61 of file srp6.h.

Member Function Documentation

step1()

BigInt Botan::SRP6_Server_Session::step1	(	const BigInt &	v,
		const std::string &	group_id,
		const std::string &	hash_id,
		RandomNumberGenerator &	rng )

Server side step 1

Parameters

v	the verification value saved from client registration

Definition at line 142 of file srp6.cpp.

   {
   DL_Group group(group_id);
   const BigInt& g = group.get_g();
   const BigInt& p = group.get_p();
 
   p_bytes = p.bytes();
 
   BigInt k = hash_seq(hash_id, p_bytes, p, g);
 
   BigInt b(rng, 256);
 
   B = (v*k + power_mod(g, b, p)) % p;
 
   this->v = v;
   this->b = b;
   this->p = p;
   this->hash_id = hash_id;
 
   return B;
   }

References Botan::BigInt::bytes(), Botan::DL_Group::get_g(), Botan::DL_Group::get_p(), and Botan::power_mod().

step2()

SymmetricKey Botan::SRP6_Server_Session::step2

(

const BigInt &

A

)

Definition at line 167 of file srp6.cpp.

   {
   if(A <= 0 || A >= p)
      throw std::runtime_error("Invalid SRP parameter from client");
 
   BigInt u = hash_seq(hash_id, p_bytes, A, B);
 
   BigInt S = power_mod(A * power_mod(v, u, p), b, p);
 
   return BigInt::encode_1363(S, p_bytes);
   }

References Botan::BigInt::encode_1363(), and Botan::power_mod().

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The documentation for this class was generated from the following files:

• src/constructs/srp6/srp6.h
• src/constructs/srp6/srp6.cpp