1 files changed, 69 insertions, 0 deletions
diff --git a/src/constructs/srp6/srp6_files.cpp b/src/constructs/srp6/srp6_files.cpp
new file mode 100644
index 000000000..2d685614f
--- /dev/null
+++ b/src/constructs/srp6/srp6_files.cpp
@@ -0,0 +1,69 @@
+/*
+* SRP-6a File Handling
+* (C) 2011 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/srp6_files.h>
+#include <botan/parsing.h>
+#include <botan/base64.h>
+#include <fstream>
+
+namespace Botan {
+
+SRP6_Authenticator_File::SRP6_Authenticator_File(const std::string& filename)
+   {
+   std::ifstream in(filename.c_str());
+
+   if(!in)
+      return; // no entries
+
+   while(in.good())
+      {
+      std::string line;
+      std::getline(in, line);
+
+      std::vector<std::string> parts = split_on(line, ':');
+
+      if(parts.size() != 4)
+         throw Decoding_Error("Invalid line in SRP authenticator file");
+
+      std::string username = parts[0];
+      BigInt v = BigInt::decode(base64_decode(parts[1]));
+      MemoryVector<byte> salt = base64_decode(parts[2]);
+      BigInt group_id_idx = BigInt::decode(base64_decode(parts[3]));
+
+      std::string group_id;
+
+      if(group_id_idx == 1)
+         group_id = "modp/srp/1024";
+      else if(group_id_idx == 2)
+         group_id = "modp/srp/1536";
+      else if(group_id_idx == 3)
+         group_id = "modp/srp/2048";
+      else
+         continue; // unknown group, ignored
+
+      entries[username] = SRP6_Data(v, salt, group_id);
+      }
+   }
+
+bool SRP6_Authenticator_File::lookup_user(const std::string& username,
+                                          BigInt& v,
+                                          MemoryVector<byte>& salt,
+                                          std::string& group_id) const
+   {
+   std::map<std::string, SRP6_Data>::const_iterator i = entries.find(username);
+
+   if(i == entries.end())
+      return false;
+
+   v = i->second.v;
+   salt = i->second.salt;
+   group_id = i->second.group_id;
+
+   return true;
+   }
+
+}