From c441a61ef6caeedd133b3d4ca979ff0e47e671d0 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Tue, 8 Nov 2016 09:58:46 +0000
Subject: [PATCH] wallet2_api: API to sign and verify a message

---
 src/wallet/api/wallet.cpp | 17 +++++++++++++++++
 src/wallet/api/wallet.h   |  3 +++
 src/wallet/wallet2_api.h  | 15 +++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/src/wallet/api/wallet.cpp b/src/wallet/api/wallet.cpp
index 3768a7998..4af7ac6f8 100644
--- a/src/wallet/api/wallet.cpp
+++ b/src/wallet/api/wallet.cpp
@@ -752,6 +752,23 @@ std::string WalletImpl::getTxKey(const std::string &txid) const
     }
 }
 
+std::string WalletImpl::signMessage(const std::string &message)
+{
+  return m_wallet->sign(message);
+}
+
+bool WalletImpl::verifySignedMessage(const std::string &message, const std::string &address, const std::string &signature) const
+{
+  cryptonote::account_public_address addr;
+  bool has_payment_id;
+  crypto::hash8 payment_id;
+
+  if (!cryptonote::get_account_integrated_address_from_str(addr, has_payment_id, payment_id, m_wallet->testnet(), address))
+    return false;
+
+  return m_wallet->verify(message, addr, signature);
+}
+
 bool WalletImpl::connectToDaemon()
 {
     bool result = m_wallet->check_connection();
diff --git a/src/wallet/api/wallet.h b/src/wallet/api/wallet.h
index 3f6d2ac7b..08bd0adbb 100644
--- a/src/wallet/api/wallet.h
+++ b/src/wallet/api/wallet.h
@@ -101,6 +101,9 @@ public:
     virtual std::string getUserNote(const std::string &txid) const;
     virtual std::string getTxKey(const std::string &txid) const;
 
+    virtual std::string signMessage(const std::string &message);
+    virtual bool verifySignedMessage(const std::string &message, const std::string &address, const std::string &signature) const;
+
 private:
     void clearStatus();
     void refreshThreadFunc();
diff --git a/src/wallet/wallet2_api.h b/src/wallet/wallet2_api.h
index da1dbd6e1..bb0862387 100644
--- a/src/wallet/wallet2_api.h
+++ b/src/wallet/wallet2_api.h
@@ -362,6 +362,21 @@ struct Wallet
      */
     virtual std::string getUserNote(const std::string &txid) const = 0;
     virtual std::string getTxKey(const std::string &txid) const = 0;
+
+    /*
+     * \brief signMessage - sign a message with the spend private key
+     * \param message - the message to sign (arbitrary byte data)
+     * \return the signature
+     */
+    virtual std::string signMessage(const std::string &message) = 0;
+    /*!
+     * \brief verifySignedMessage - verify a signature matches a given message
+     * \param message - the message (arbitrary byte data)
+     * \param address - the address the signature claims to be made with
+     * \param signature - the signature
+     * \return true if the signature verified, false otherwise
+     */
+    virtual bool verifySignedMessage(const std::string &message, const std::string &addres, const std::string &signature) const = 0;
 };
 
 /**