From 163be8a6d0d4cb73fd2e45a7ec34db756d6a46f7 Mon Sep 17 00:00:00 2001
From: vogel76 <wrona@syncad.com>
Date: Mon, 3 Mar 2014 11:30:23 +0100
Subject: [PATCH] [BW]: [NIP] Added public_key::to_base58 text conversion to
 simplify contact display_name generation at bts side.

---
 include/fc/crypto/elliptic.hpp |  4 ++++
 src/crypto/elliptic.cpp        | 17 ++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/fc/crypto/elliptic.hpp b/include/fc/crypto/elliptic.hpp
index d507051..ac411a0 100644
--- a/include/fc/crypto/elliptic.hpp
+++ b/include/fc/crypto/elliptic.hpp
@@ -57,6 +57,10 @@ namespace fc {
            {
             return a.serialize() != b.serialize();
            }
+
+           /// Allows to convert current public key object into base58 number.
+           std::string to_base58() const;
+
         private:
           friend class private_key;
           fc::fwd<detail::public_key_impl,8> my;
diff --git a/src/crypto/elliptic.cpp b/src/crypto/elliptic.cpp
index 9654096..dda84f2 100644
--- a/src/crypto/elliptic.cpp
+++ b/src/crypto/elliptic.cpp
@@ -1,8 +1,12 @@
 #include <fc/crypto/elliptic.hpp>
+
+#include <fc/crypto/base58.hpp>
+#include <fc/crypto/openssl.hpp>
+
 #include <fc/fwd_impl.hpp>
 #include <fc/exception/exception.hpp>
 #include <fc/log/logger.hpp>
-#include <fc/crypto/openssl.hpp>
+
 #include <assert.h>
 
 namespace fc { namespace ecc {
@@ -257,6 +261,17 @@ namespace fc { namespace ecc {
       } FC_RETHROW_EXCEPTIONS( debug, "digest: ${digest}", ("digest",digest) );
     }
 
+    std::string public_key::to_base58() const
+      {
+      public_key_data key = serialize();
+      uint32_t check = uint32_t(city_hash64(key.data, sizeof(key)));
+      assert(key.size() + sizeof(check) == 37);
+      array<char, 37> data;
+      memcpy(data.data, key.begin(), key.size());
+      memcpy(data.begin() + key.size(), (const char*)&check, sizeof(check));
+      return fc::to_base58(data.begin(), data.size());
+      }
+
     private_key::private_key()
     {}