diff --git a/cmake/Modules/Finded25519.cmake b/cmake/Modules/Finded25519.cmake
new file mode 100644
index 0000000000..930b3bee54
--- /dev/null
+++ b/cmake/Modules/Finded25519.cmake
@@ -0,0 +1,41 @@
+add_library(ed25519 UNKNOWN IMPORTED)
+
+find_path(ed25519_INCLUDE_DIR ed25519/ed25519.h)
+mark_as_advanced(ed25519_INCLUDE_DIR)
+
+find_library(ed25519_LIBRARY ed25519)
+mark_as_advanced(ed25519_LIBRARY)
+
+find_package_handle_standard_args(ed25519 DEFAULT_MSG
+    ed25519_INCLUDE_DIR
+    ed25519_LIBRARY
+    )
+
+set(URL https://github.com/warchant/ed25519.git)
+set(VERSION 0d31b082e0f0d4144fe598fb0f2a120e36de2a8f)
+set_target_description(ed25519 "Digital signature algorithm" ${URL} ${VERSION})
+
+if (NOT ed25519_FOUND)
+  externalproject_add(warchant_ed25519
+      GIT_REPOSITORY ${URL}
+      GIT_TAG        ${VERSION}
+      CMAKE_ARGS
+      -DTESTING=OFF
+      INSTALL_COMMAND "" # remove install step
+      TEST_COMMAND    "" # remove test step
+      UPDATE_COMMAND  "" # remove update step
+      )
+  externalproject_get_property(warchant_ed25519 binary_dir)
+  externalproject_get_property(warchant_ed25519 source_dir)
+  set(ed25519_INCLUDE_DIR ${source_dir}/include)
+  set(ed25519_LIBRARY ${binary_dir}/${CMAKE_SHARED_LIBRARY_PREFIX}ed25519${CMAKE_SHARED_LIBRARY_SUFFIX})
+  message(STATUS ${ed25519_LIBRARY})
+  file(MAKE_DIRECTORY ${ed25519_INCLUDE_DIR})
+
+  add_dependencies(ed25519 warchant_ed25519)
+endif ()
+
+set_target_properties(ed25519 PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES ${ed25519_INCLUDE_DIR}
+    IMPORTED_LOCATION ${ed25519_LIBRARY}
+    )
diff --git a/cmake/dependencies.cmake b/cmake/dependencies.cmake
index c49de5e1c2..31bea19515 100644
--- a/cmake/dependencies.cmake
+++ b/cmake/dependencies.cmake
@@ -101,4 +101,7 @@ if(BENCHMARKING)
   find_package(benchmark)
 endif()
 
-
+###################################
+#          ed25519/sha3           #
+###################################
+find_package(ed25519)
diff --git a/docker/develop/Dockerfile b/docker/develop/Dockerfile
index 65b8cbe74a..d8e8e57487 100644
--- a/docker/develop/Dockerfile
+++ b/docker/develop/Dockerfile
@@ -184,5 +184,13 @@ RUN git clone git://sourceware.org/git/valgrind.git /tmp/valgrind; \
     make -C /tmp/valgrind install; \
     rm -rf /tmp/valgrind
 
+# install ed25519
+RUN git clone git://github.com/warchant/ed25519.git /tmp/ed25519; \
+    (cd /tmp/ed25519 ; git checkout 0d31b082e0f0d4144fe598fb0f2a120e36de2a8f); \
+    cmake -DCMAKE_BUILD_TYPE=Debug -DTESTING=OFF -H/tmp/ed25519 -B/tmp/ed25519/build; \
+    cmake --build /tmp/ed25519/build --target install -- -j${PARALLELISM}; \
+    ldconfig; \
+    rm -rf /tmp/ed25519
+
 WORKDIR /opt/iroha
 CMD ["/bin/bash"]
diff --git a/libs/common/types.hpp b/libs/common/types.hpp
index 8580c19c17..dbe93c324d 100644
--- a/libs/common/types.hpp
+++ b/libs/common/types.hpp
@@ -307,7 +307,7 @@ namespace iroha {
 
   using sig_t = blob_t<64>;  // ed25519 sig is 64 bytes length
   using pubkey_t = blob_t<32>;
-  using privkey_t = blob_t<64>;
+  using privkey_t = blob_t<32>;
 
   struct keypair_t {
     keypair_t() = default;