[#2] Add methods sign and verify

Signed-off-by: ilyas585 <niyazov2023@gmail.com>

tests/cryptography/test_key_extension.py

@@ -0,0 +1,39 @@
+import pytest
+
+from tests.helpers.models import ClientCryptograpy
+from tests.helpers.convert import convert_bytes_format_127_to_256
+from tests.helpers.resources import WIF, PRIVATE_KEY
+
+
+@pytest.mark.crypto
+class TestKeyExtension:
+    def test_get_private_key_from_wif_success(self, client_cryptography: ClientCryptograpy):
+        private_key = client_cryptography.key_extension.get_private_key_from_wif(WIF)
+
+        assert len(private_key) == 32, f"Not correct len of private key, expected: 32 Actual: {len(private_key)} "
+        assert isinstance(private_key, bytes), f"Not correct type of private key, Expected bytes, Actual: {type(private_key)}"
+        assert private_key == bytes(convert_bytes_format_127_to_256(PRIVATE_KEY)), \
+            f"Not match private key, Expected: {PRIVATE_KEY}, Actual: {private_key}"
+
+    def test_get_private_key_empty_wif(self, client_cryptography: ClientCryptograpy):
+        with pytest.raises(ValueError, match="Empty"):
+            client_cryptography.key_extension.get_private_key_from_wif("")
+
+    def test_get_private_key_incorrect_wif(self, client_cryptography: ClientCryptograpy):
+        with pytest.raises(ValueError, match="Invalid checksum"):
+            client_cryptography.key_extension.get_private_key_from_wif("AAAAAAABBBBBBBBBBBCCCCCCCDDDDDDDDDDDDDDDDD")
+
+    def test_get_public_key(self, client_cryptography: ClientCryptograpy):
+        private_key = client_cryptography.key_extension.get_private_key_from_wif(WIF)
+        public_key = client_cryptography.key_extension.get_public_key(private_key)
+
+        assert len(public_key) == 33, f"Not correct len of public key, expected: 33 Actual: {len(private_key)} "
+        assert isinstance(public_key, bytes), f"Not correct type of public key, Expected bytes, Actual: {type(private_key)}"
+
+    def test_get_public_key_empty(self, client_cryptography: ClientCryptograpy):
+        with pytest.raises(ValueError, match="Empty"):
+            client_cryptography.key_extension.get_public_key(b"")
+
+    def test_get_public_key_invalid_private_key(self, client_cryptography: ClientCryptograpy):
+        with pytest.raises(ValueError):
+            client_cryptography.key_extension.get_public_key(b"invalid_private_key")