Add the modules for encryption, decryption.

tests/sdes/test_decrypt.py

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+import pytest
+from cryptography_s_des_exploring.sdes.decrypt import decrypt, decrypt_block
+
+
+@pytest.mark.parametrize("key, message, expected_ciphertext", [
+    ('1111001110', '00100001', '11110011'),
+    ('1111001111', '11110111', '00010011'),
+    # 0b1101000 = 104 ('h')
+    ('1111001110', '10100011', '01101000'),
+    # 0b1100101 = 101 ('e')
+    ('1111001110', '10000111', '01100101'),
+    # 0b1101100 = 108 ('l')
+    ('1111001110', '11100110', '01101100'),
+    # 0b1101111 = 111 ('o')
+    ('1111001110', '11001110', '01101111'),
+])
+def test_encrypt_block(key, message, expected_ciphertext):
+    result = decrypt_block(key, message)
+    assert expected_ciphertext == result
+
+
+@pytest.mark.parametrize("key, message, expected_ciphertext", [
+    ('1111001110', 'wkwaR1xMpoE=', 'hello'),
+    ('1111001110', 'nEp+f+C3CRmcSkp/5s1MCQ==', 'привіт'),
+])
+def test_encrypt(key, message, expected_ciphertext):
+    result = decrypt(key, message)
+    assert expected_ciphertext == result
+

tests/sdes/test_encrypt.py

@@ -0,0 +1,29 @@
+import pytest
+from cryptography_s_des_exploring.sdes.encrypt import encrypt, encrypt_block
+
+
+@pytest.mark.parametrize("key, message, expected_ciphertext", [
+    ('1111001110', '11110011', '00100001'),
+    ('1111001111', '00010011', '11110111'),
+    # 0b1101000 = 104 ('h')
+    ('1111001110', '01101000', '10100011'),
+    # 0b1100101 = 101 ('e')
+    ('1111001110', '01100101', '10000111'),
+    # 0b1101100 = 108 ('l')
+    ('1111001110', '01101100', '11100110'),
+    # 0b1101111 = 111 ('o')
+    ('1111001110', '01101111', '11001110'),
+])
+def test_encrypt_block(key, message, expected_ciphertext):
+    result = encrypt_block(key, message)
+    assert expected_ciphertext == result
+
+
+@pytest.mark.parametrize("key, message, expected_ciphertext", [
+    ('1111001110', 'hello', b'wkwaR1xMpoE='),
+    ('1111001110', 'привіт', b'nEp+f+C3CRmcSkp/5s1MCQ=='),
+])
+def test_encrypt(key, message, expected_ciphertext):
+    result = encrypt(key, message)
+    assert expected_ciphertext == result
+