diff --git a/pkgs/development/python-modules/ecpy/default.nix b/pkgs/development/python-modules/ecpy/default.nix
new file mode 100644
index 000000000000..57549792d218
--- /dev/null
+++ b/pkgs/development/python-modules/ecpy/default.nix
@@ -0,0 +1,22 @@
+{ stdenv, fetchPypi, buildPythonPackage, hidapi
+, pycrypto, pillow, protobuf, future, ecpy
+}:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "ECPy";
+  version = "0.8.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0ab60sx4bbsmccwmdvz1023r0cbzi4phar4ipzn5npdj5gw1ny4l";
+  };
+
+  buildInputs = [ hidapi pycrypto pillow protobuf future ];
+
+  meta = with stdenv.lib; {
+    description = "Pure Pyhton Elliptic Curve Library";
+    homepage = "https://github.com/ubinity/ECPy";
+    license = licenses.asl20;
+  };
+}
diff --git a/pkgs/development/python-modules/ed25519/default.nix b/pkgs/development/python-modules/ed25519/default.nix
new file mode 100644
index 000000000000..1cdf85385e8b
--- /dev/null
+++ b/pkgs/development/python-modules/ed25519/default.nix
@@ -0,0 +1,19 @@
+{ stdenv, fetchPypi, buildPythonPackage }:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "ed25519";
+  version = "1.4";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0ahx1nkxa0xis3cw0h5c4fpgv8mq4znkq7kajly33lc3317bk499";
+  };
+
+  meta = with stdenv.lib; {
+    description = "Ed25519 public-key signatures";
+    homepage = "https://github.com/warner/python-ed25519";
+    license = licenses.mit;
+    maintainers = with maintainers; [ np ];
+  };
+}
diff --git a/pkgs/development/python-modules/hidapi/default.nix b/pkgs/development/python-modules/hidapi/default.nix
new file mode 100644
index 000000000000..697bc1cd0e3d
--- /dev/null
+++ b/pkgs/development/python-modules/hidapi/default.nix
@@ -0,0 +1,30 @@
+{ stdenv, libusb1, udev, fetchPypi, buildPythonPackage, cython }:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "hidapi";
+  version = "0.7.99.post20";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1k7z5m7xsqy8j4qkjy4pfxdx4hm36ha68vi65z6smvnyg4zgv22z";
+  };
+
+  propagatedBuildInputs = [ libusb1 udev cython ];
+
+  # Fix the USB backend library lookup
+  postPatch = ''
+    libusb=${libusb1.dev}/include/libusb-1.0
+    test -d $libusb || { echo "ERROR: $libusb doesn't exist, please update/fix this build expression."; exit 1; }
+    sed -i -e "s|/usr/include/libusb-1.0|$libusb|" setup.py
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A Cython interface to the hidapi from https://github.com/signal11/hidapi";
+    homepage = https://github.com/trezor/cython-hidapi;
+    # license can actually be either bsd3 or gpl3
+    # see https://github.com/trezor/cython-hidapi/blob/master/LICENSE-orig.txt
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ np ];
+  };
+}
diff --git a/pkgs/development/python-modules/keepkey/default.nix b/pkgs/development/python-modules/keepkey/default.nix
new file mode 100644
index 000000000000..0d7f7661e7dd
--- /dev/null
+++ b/pkgs/development/python-modules/keepkey/default.nix
@@ -0,0 +1,30 @@
+{ stdenv, fetchPypi, buildPythonPackage, ecdsa
+, mnemonic, protobuf3_0, hidapi }:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "keepkey";
+  version = "0.7.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "14d2r8dlx997ypgma2k8by90acw7i3l7hfq4gar9lcka0lqfj714";
+  };
+
+  propagatedBuildInputs = [ protobuf3_0 hidapi ];
+
+  buildInputs = [ ecdsa mnemonic ];
+
+  # There are no actual tests: "ImportError: No module named tests"
+  doCheck = false;
+
+  # Remove impossible dependency constraint
+  postPatch = "sed -i -e 's|hidapi==|hidapi>=|' setup.py";
+
+  meta = with stdenv.lib; {
+    description = "KeepKey Python client";
+    homepage = https://github.com/keepkey/python-keepkey;
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ np ];
+  };
+}
diff --git a/pkgs/development/python-modules/ledgerblue/default.nix b/pkgs/development/python-modules/ledgerblue/default.nix
new file mode 100644
index 000000000000..9ed18190a8e3
--- /dev/null
+++ b/pkgs/development/python-modules/ledgerblue/default.nix
@@ -0,0 +1,23 @@
+{ stdenv, fetchPypi, buildPythonPackage, hidapi
+, pycrypto, pillow, protobuf, future, ecpy
+}:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "ledgerblue";
+  version = "0.1.13";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "09bsiylvgax6m47w8r0myaf61xj9j0h1spvadx6fx31qy0iqicw0";
+  };
+
+  buildInputs = [ hidapi pycrypto pillow protobuf future ecpy ];
+
+  meta = with stdenv.lib; {
+    description = "Python library to communicate with Ledger Blue/Nano S";
+    homepage = "https://github.com/LedgerHQ/blue-loader-python";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ np ];
+  };
+}
diff --git a/pkgs/development/python-modules/libagent/default.nix b/pkgs/development/python-modules/libagent/default.nix
new file mode 100644
index 000000000000..5192abf8200f
--- /dev/null
+++ b/pkgs/development/python-modules/libagent/default.nix
@@ -0,0 +1,26 @@
+{ stdenv, fetchPypi, buildPythonPackage, ed25519, ecdsa
+, semver, keepkey, trezor, mnemonic, ledgerblue
+}:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "libagent";
+  version = "0.9.1";
+
+  src = fetchPypi{
+    inherit pname version;
+    sha256 = "1g19lsid7lqw567w31fif89w088lzbgh27xpb1pshjk1gvags3bc";
+  };
+
+  buildInputs = [
+    ed25519 ecdsa semver keepkey
+    trezor mnemonic ledgerblue
+  ];
+
+  meta = with stdenv.lib; {
+    description = "Using hardware wallets as SSH/GPG agent";
+    homepage = "https://github.com/romanz/trezor-agent";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ np ];
+  };
+}
diff --git a/pkgs/development/python-modules/mnemonic/default.nix b/pkgs/development/python-modules/mnemonic/default.nix
new file mode 100644
index 000000000000..9f71fdb8e741
--- /dev/null
+++ b/pkgs/development/python-modules/mnemonic/default.nix
@@ -0,0 +1,21 @@
+{ lib, fetchurl, buildPythonPackage, pbkdf2 }:
+
+buildPythonPackage rec {
+  pname = "mnemonic";
+  version = "0.17";
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "mirror://pypi/m/${pname}/${name}.tar.gz";
+    sha256 = "1hq6xb47jagfqf65iwcrh0065mj3521d2mxmahg7vfraihqyqdjn";
+  };
+
+  propagatedBuildInputs = [ pbkdf2 ];
+
+  meta = {
+    description = "Implementation of Bitcoin BIP-0039";
+    homepage = https://github.com/trezor/python-mnemonic;
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ np ];
+  };
+}
diff --git a/pkgs/development/python-modules/semver/default.nix b/pkgs/development/python-modules/semver/default.nix
new file mode 100644
index 000000000000..285da5460717
--- /dev/null
+++ b/pkgs/development/python-modules/semver/default.nix
@@ -0,0 +1,19 @@
+{ stdenv, fetchPypi, buildPythonPackage }:
+
+buildPythonPackage rec {
+  name = "${pname}-${version}";
+  pname = "semver";
+  version = "2.2.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "161gvsfpw0l8lnf1v19rvqc8b9f8n70cc8ppya4l0n6rwc1c1n4m";
+  };
+
+  meta = with stdenv.lib; {
+    description = "Python package to work with Semantic Versioning (http://semver.org/)";
+    homepage = "https://github.com/k-bx/python-semver";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ np ];
+  };
+}
diff --git a/pkgs/development/python-modules/trezor.nix b/pkgs/development/python-modules/trezor/default.nix
similarity index 80%
rename from pkgs/development/python-modules/trezor.nix
rename to pkgs/development/python-modules/trezor/default.nix
index 70160dcb0f94..6fc6622cf3f2 100644
--- a/pkgs/development/python-modules/trezor.nix
+++ b/pkgs/development/python-modules/trezor/default.nix
@@ -1,12 +1,12 @@
-{ lib, fetchurl, buildPythonPackage, protobuf3_0, hidapi, ecdsa, mnemonic }:
+{ lib, fetchPypi, buildPythonPackage, protobuf3_0, hidapi, ecdsa, mnemonic }:
 
 buildPythonPackage rec {
+  name = "${pname}-${version}";
   pname = "trezor";
   version = "0.7.13";
-  name = "${pname}-${version}";
 
-  src = fetchurl {
-    url = "mirror://pypi/t/${pname}/${name}.tar.gz";
+  src = fetchPypi {
+    inherit pname version;
     sha256 = "d05f388bb56b6f61cc727999cc725078575238a0b6172450322bc55c437fefe5";
   };
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 696f8ad7c862..c694534d3a98 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -29626,106 +29626,40 @@ EOF
     };
   };
 
-  hidapi = buildPythonPackage rec{
-    version = "0.7.99.post15";
-    name = "hidapi-${version}";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/h/hidapi/${name}.tar.gz";
-      sha256 = "09wlr1d7mx80974bsq62j4pk80234jgl7ip4br0y43q6999dpcr0";
-    };
-
-    propagatedBuildInputs = with self; [ pkgs.libusb1 pkgs.udev cython ];
-
-    # Fix the USB backend library lookup
-    postPatch = ''
-      libusb=${pkgs.libusb1.dev}/include/libusb-1.0
-      test -d $libusb || { echo "ERROR: $libusb doesn't exist, please update/fix this build expression."; exit 1; }
-      sed -i -e "s|/usr/include/libusb-1.0|$libusb|" setup.py
-    '';
-
-    meta = {
-      description = "A Cython interface to the hidapi from https://github.com/signal11/hidapi";
-      homepage = https://github.com/trezor/cython-hidapi;
-      # license can actually be either bsd3 or gpl3
-      # see https://github.com/trezor/cython-hidapi/blob/master/LICENSE-orig.txt
-      license = licenses.bsd3;
-      maintainers = with maintainers; [ np ];
-    };
+  hidapi = callPackage ../development/python-modules/hidapi {
+    inherit (pkgs) udev libusb1;
   };
 
-  mnemonic = callPackage ../development/python-modules/mnemonic.nix { };
+  mnemonic = callPackage ../development/python-modules/mnemonic { };
 
-  trezor = callPackage ../development/python-modules/trezor.nix { };
+  keepkey = callPackage ../development/python-modules/keepkey { };
 
-  keepkey = buildPythonPackage rec{
-    version = "0.7.3";
-    name = "keepkey-${version}";
+  libagent = callPackage ../development/python-modules/libagent { };
 
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/k/keepkey/${name}.tar.gz";
-      sha256 = "14d2r8dlx997ypgma2k8by90acw7i3l7hfq4gar9lcka0lqfj714";
-    };
+  ledgerblue = callPackage ../development/python-modules/ledgerblue { };
 
-    propagatedBuildInputs = with self; [ protobuf3_0 hidapi ];
+  ecpy = callPackage ../development/python-modules/ecpy { };
 
-    buildInputs = with self; [ ecdsa mnemonic ];
+  semver = callPackage ../development/python-modules/semver { };
 
-    # There are no actual tests: "ImportError: No module named tests"
-    doCheck = false;
+  ed25519 = callPackage ../development/python-modules/ed25519 { };
 
-    meta = {
-      description = "KeepKey Python client";
-      homepage = https://github.com/keepkey/python-keepkey;
-      license = licenses.gpl3;
-      maintainers = with maintainers; [ np ];
-    };
-  };
-
-  semver = buildPythonPackage rec {
-    name = "semver-${version}";
-    version = "2.2.1";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/s/semver/${name}.tar.gz";
-      sha256 = "161gvsfpw0l8lnf1v19rvqc8b9f8n70cc8ppya4l0n6rwc1c1n4m";
-    };
-
-    meta = {
-      description = "Python package to work with Semantic Versioning (http://semver.org/)";
-      homepage = "https://github.com/k-bx/python-semver";
-      license = licenses.bsd3;
-      maintainers = with maintainers; [ np ];
-    };
-  };
-
-  ed25519 = buildPythonPackage rec {
-    name = "ed25519-${version}";
-    version = "1.4";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/e/ed25519/${name}.tar.gz";
-      sha256 = "0ahx1nkxa0xis3cw0h5c4fpgv8mq4znkq7kajly33lc3317bk499";
-    };
-
-    meta = {
-      description = "Ed25519 public-key signatures";
-      homepage = "https://github.com/warner/python-ed25519";
-      license = licenses.mit;
-      maintainers = with maintainers; [ np ];
-    };
-  };
+  trezor = callPackage ../development/python-modules/trezor { };
 
   trezor_agent = buildPythonPackage rec{
-    version = "0.7.0";
-    name = "trezor_agent-${version}";
+    name = "${pname}-${version}";
+    pname = "trezor_agent";
+    version = "0.9.0";
 
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/t/trezor_agent/${name}.tar.gz";
-      sha256 = "1x1gwih6w8kxhpgmcp0v1k7mpmfsqiikkjca291sd0v2if24x7q1";
+    src = fetchPypi {
+      inherit pname version;
+      sha256 = "1i5cdamlf3c0ym600pjklij74p8ifj9cv7xrpnrfl1b8nkadswbz";
     };
 
-    propagatedBuildInputs = with self; [ trezor ecdsa ed25519 mnemonic keepkey semver ];
+    propagatedBuildInputs = with self; [
+      trezor libagent ecdsa ed25519
+      mnemonic keepkey semver
+    ];
 
     meta = {
       description = "Using Trezor as hardware SSH agent";