Work in progress implementation of some ideas from the not-yet-written HIP39

src/Makefile.am

@@ -358,6 +358,8 @@ crypto_libbitcoin_crypto_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_CONFIG_INCLUDES)
 crypto_libbitcoin_crypto_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 crypto_libbitcoin_crypto_a_SOURCES = \
   crypto/common.h \
+  crypto/bip39/bip39.h \
+  crypto/bip39/bip39.c \
   crypto/equihash.cpp \
   crypto/equihash.h \
   crypto/equihash.tcc \

src/rpc/server.cpp

@@ -651,6 +651,7 @@ static const CRPCCommand vRPCCommands[] =
     { "wallet",             "walletlock",             &walletlock,             true  },
     { "wallet",             "walletpassphrasechange", &walletpassphrasechange, true  },
     { "wallet",             "walletpassphrase",       &walletpassphrase,       true  },
+    { "wallet",             "walletseedphrase",       &walletseedphrase,       true  },
     { "wallet",             "z_listreceivedbyaddress",&z_listreceivedbyaddress,false },
     { "wallet",             "z_listreceivedaddress",  &z_listreceivedaddress,  false },
     { "wallet",             "z_getbalance",           &z_getbalance,           false },

src/rpc/server.h

@@ -384,6 +384,7 @@ extern UniValue gettransaction(const UniValue& params, bool fHelp, const CPubKey
 extern UniValue backupwallet(const UniValue& params, bool fHelp, const CPubKey& mypk);
 extern UniValue keypoolrefill(const UniValue& params, bool fHelp, const CPubKey& mypk);
 extern UniValue walletpassphrase(const UniValue& params, bool fHelp, const CPubKey& mypk);
+extern UniValue walletseedphrase(const UniValue& params, bool fHelp, const CPubKey& mypk);
 extern UniValue walletpassphrasechange(const UniValue& params, bool fHelp, const CPubKey& mypk);
 extern UniValue walletlock(const UniValue& params, bool fHelp, const CPubKey& mypk);
 extern UniValue encryptwallet(const UniValue& params, bool fHelp, const CPubKey& mypk);

src/wallet/rpcwallet.cpp

@@ -64,6 +64,7 @@
 #include "komodo_defs.h"
 #include <string.h>
 #include "rpchushwallet.h"
+#include "crypto/bip39/bip39.h"
 
 using namespace std;
 
@@ -2407,6 +2408,30 @@ static void LockWallet(CWallet* pWallet)
     pWallet->Lock();
 }
 
+UniValue walletseedphrase(const UniValue& params, bool fHelp, const CPubKey& mypk)
+{
+    if (!EnsureWalletIsAvailable(fHelp))
+        return NullUniValue;
+
+    if (fHelp || params.size() > 1)
+        throw runtime_error(
+            "walletseedphrase\n"
+            "\nReturns HIP39 seedphrase of the current wallet."
+            + HelpRequiringPassphrase() + "\n"
+            "\nExamples:\n"
+            + HelpExampleCli("walletseedphrase", "")
+            + HelpExampleRpc("walletseedphrase", "")
+        );
+
+    LOCK2(cs_main, pwalletMain->cs_wallet);
+    UniValue seedphrase(UniValue::VSTR);
+    //TODO: Currently we just generate a random seedphrase
+    int strength = 256;
+    const char *mnemonic = mnemonic_generate(strength);
+    seedphrase = std::string(mnemonic);
+    return seedphrase;
+}
+
 UniValue walletpassphrase(const UniValue& params, bool fHelp, const CPubKey& mypk)
 {
     if (!EnsureWalletIsAvailable(fHelp))
@@ -8291,6 +8316,7 @@ static const CRPCCommand commands[] =
     { "wallet",             "walletlock",               &walletlock,               true  },
     { "wallet",             "walletpassphrasechange",   &walletpassphrasechange,   true  },
     { "wallet",             "walletpassphrase",         &walletpassphrase,         true  },
+    { "wallet",             "walletseedphrase",         &walletseedphrase,         true  },
     { "wallet",             "z_listreceivedbyaddress",  &z_listreceivedbyaddress,  false },
     { "wallet",             "z_listunspent",            &z_listunspent,            false },
     { "wallet",             "z_getbalance",             &z_getbalance,             false },