wallet: add encrypted seed functionality

This uses luigi1111's CN_Add method.
See https://xmr.llcoins.net for details.

2 files changed, 19 insertions, 0 deletions

diff --git a/src/cryptonote_basic/cryptonote_format_utils.cpp b/src/cryptonote_basic/cryptonote_format_utils.cpp
index 745dfb72e..e73f5d778 100644
--- a/src/cryptonote_basic/cryptonote_format_utils.cpp
+++ b/src/cryptonote_basic/cryptonote_format_utils.cpp
@@ -869,4 +869,21 @@ namespace cryptonote
     block_hashes_calculated = block_hashes_calculated_count;
     block_hashes_cached = block_hashes_cached_count;
   }
+  //---------------------------------------------------------------
+  crypto::secret_key encrypt_key(const crypto::secret_key &key, const std::string &passphrase)
+  {
+    crypto::hash hash;
+    crypto::cn_slow_hash(passphrase.data(), passphrase.size(), hash);
+    sc_add((unsigned char*)key.data, (const unsigned char*)key.data, (const unsigned char*)hash.data);
+    return key;
+  }
+  //---------------------------------------------------------------
+  crypto::secret_key decrypt_key(const crypto::secret_key &key, const std::string &passphrase)
+  {
+    crypto::hash hash;
+    crypto::cn_slow_hash(passphrase.data(), passphrase.size(), hash);
+    sc_sub((unsigned char*)key.data, (const unsigned char*)key.data, (const unsigned char*)hash.data);
+    return key;
+  }
+
 }
diff --git a/src/cryptonote_basic/cryptonote_format_utils.h b/src/cryptonote_basic/cryptonote_format_utils.h
index d8ccf8eec..00080fb98 100644
--- a/src/cryptonote_basic/cryptonote_format_utils.h
+++ b/src/cryptonote_basic/cryptonote_format_utils.h
@@ -212,6 +212,8 @@ namespace cryptonote
   bool is_valid_decomposed_amount(uint64_t amount);
   void get_hash_stats(uint64_t &tx_hashes_calculated, uint64_t &tx_hashes_cached, uint64_t &block_hashes_calculated, uint64_t & block_hashes_cached);
 
+  crypto::secret_key encrypt_key(const crypto::secret_key &key, const std::string &passphrase);
+  crypto::secret_key decrypt_key(const crypto::secret_key &key, const std::string &passphrase);
 #define CHECKED_GET_SPECIFIC_VARIANT(variant_var, specific_type, variable_name, fail_return_val) \
   CHECK_AND_ASSERT_MES(variant_var.type() == typeid(specific_type), fail_return_val, "wrong variant type: " << variant_var.type().name() << ", expected " << typeid(specific_type).name()); \
   specific_type& variable_name = boost::get<specific_type>(variant_var);