From 543e9766a119238af44f9ea6b4d3f619b1fcd4cf Mon Sep 17 00:00:00 2001
From: Clemens Schwaighofer <clemens.schwaighofer@egplusww.com>
Date: Thu, 23 Oct 2025 11:47:41 +0900
Subject: [PATCH] Add symmetric encryption and tests

---
 pyproject.toml                                |   1 +
 src/corelibs/encryption_handling/__init__.py  |   0
 .../symmetric_encryption.py                   | 152 ++++
 test-run/encryption/symmetric_encryption.py   |  34 +
 tests/unit/encryption_handling/__init__.py    |   3 +
 .../test_symmetric_encryption.py              | 665 ++++++++++++++++++
 uv.lock                                       | 114 ++-
 7 files changed, 968 insertions(+), 1 deletion(-)
 create mode 100644 src/corelibs/encryption_handling/__init__.py
 create mode 100644 src/corelibs/encryption_handling/symmetric_encryption.py
 create mode 100644 test-run/encryption/symmetric_encryption.py
 create mode 100644 tests/unit/encryption_handling/__init__.py
 create mode 100644 tests/unit/encryption_handling/test_symmetric_encryption.py

diff --git a/pyproject.toml b/pyproject.toml
index 3d9b62a..4b38a4d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,6 +6,7 @@ description = "Collection of utils for Python scripts"
 readme = "README.md"
 requires-python = ">=3.13"
 dependencies = [
+    "cryptography>=46.0.3",
     "jmespath>=1.0.1",
     "psutil>=7.0.0",
     "requests>=2.32.4",
diff --git a/src/corelibs/encryption_handling/__init__.py b/src/corelibs/encryption_handling/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/corelibs/encryption_handling/symmetric_encryption.py b/src/corelibs/encryption_handling/symmetric_encryption.py
new file mode 100644
index 0000000..026ab69
--- /dev/null
+++ b/src/corelibs/encryption_handling/symmetric_encryption.py
@@ -0,0 +1,152 @@
+"""
+simple symmetric encryption
+Will be moved to CoreLibs
+TODO: set key per encryption run
+"""
+
+import os
+import json
+import base64
+import hashlib
+from typing import TypedDict, cast
+from cryptography.fernet import Fernet
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
+
+
+class PackageData(TypedDict):
+    """encryption package"""
+    encrypted_data: str
+    salt: str
+    key_hash: str
+
+
+class SymmetricEncryption:
+    """
+    simple encryption
+
+    the encrypted package has "encrypted_data" and "salt" as fields, salt is needed to create the
+    key from the password to decrypt
+    """
+
+    def __init__(self, password: str):
+        if not password:
+            raise ValueError("A password must be set")
+        self.password = password
+        self.password_hash = hashlib.sha256(password.encode('utf-8')).hexdigest()
+
+    def __derive_key_from_password(self, password: str, salt: bytes) -> bytes:
+        _password = password.encode('utf-8')
+        kdf = PBKDF2HMAC(
+            algorithm=hashes.SHA256(),
+            length=32,
+            salt=salt,
+            iterations=100000,
+        )
+        key = base64.urlsafe_b64encode(kdf.derive(_password))
+        return key
+
+    def __encrypt_with_metadata(self, data: str | bytes) -> PackageData:
+        """Encrypt data and include salt if password-based"""
+        # convert to bytes (for encoding)
+        if isinstance(data, str):
+            data = data.encode('utf-8')
+
+        # generate salt and key from password
+        salt = os.urandom(16)
+        key = self.__derive_key_from_password(self.password, salt)
+        # init the cypher suit
+        cipher_suite = Fernet(key)
+
+        encrypted_data = cipher_suite.encrypt(data)
+
+        # If using password, include salt in the result
+        return {
+            'encrypted_data': base64.urlsafe_b64encode(encrypted_data).decode('utf-8'),
+            'salt': base64.urlsafe_b64encode(salt).decode('utf-8'),
+            'key_hash': hashlib.sha256(key).hexdigest()
+        }
+
+    def encrypt_with_metadata(self, data: str | bytes, return_as: str = 'str') -> str | bytes | PackageData:
+        """encrypt with metadata, but returns data in string"""
+        match return_as:
+            case 'str':
+                return self.encrypt_with_metadata_return_str(data)
+            case 'json':
+                return self.encrypt_with_metadata_return_str(data)
+            case 'bytes':
+                return self.encrypt_with_metadata_return_bytes(data)
+            case 'dict':
+                return self.encrypt_with_metadata_return_dict(data)
+            case _:
+                # default is string json
+                return self.encrypt_with_metadata_return_str(data)
+
+    def encrypt_with_metadata_return_dict(self, data: str | bytes) -> PackageData:
+        """encrypt with metadata, but returns data as PackageData dict"""
+        return self.__encrypt_with_metadata(data)
+
+    def encrypt_with_metadata_return_str(self, data: str | bytes) -> str:
+        """encrypt with metadata, but returns data in string"""
+        return json.dumps(self.__encrypt_with_metadata(data))
+
+    def encrypt_with_metadata_return_bytes(self, data: str | bytes) -> bytes:
+        """encrypt with metadata, but returns data in bytes"""
+        return json.dumps(self.__encrypt_with_metadata(data)).encode('utf-8')
+
+    def decrypt_with_metadata(self, encrypted_package: str | bytes | PackageData, password: str | None = None) -> str:
+        """Decrypt data that may include metadata"""
+        try:
+            # Try to parse as JSON (password-based encryption)
+            if isinstance(encrypted_package, bytes):
+                package_data = cast(PackageData, json.loads(encrypted_package.decode('utf-8')))
+            elif isinstance(encrypted_package, str):
+                package_data = cast(PackageData, json.loads(str(encrypted_package)))
+            else:
+                package_data = encrypted_package
+
+            encrypted_data = base64.urlsafe_b64decode(package_data['encrypted_data'])
+            salt = base64.urlsafe_b64decode(package_data['salt'])
+            pwd = password or self.password
+            key = self.__derive_key_from_password(pwd, salt)
+            if package_data['key_hash'] != hashlib.sha256(key).hexdigest():
+                raise ValueError("Key hash is not matching, possible invalid password")
+            cipher_suite = Fernet(key)
+            decrypted_data = cipher_suite.decrypt(encrypted_data)
+
+        except (json.JSONDecodeError, KeyError, UnicodeDecodeError) as e:
+            raise ValueError(f"Invalid encrypted package format {e}") from e
+
+        return decrypted_data.decode('utf-8')
+
+    @staticmethod
+    def encrypt_data(data: str | bytes, password: str) -> str:
+        """
+        Static method to encrypt some data
+
+        Arguments:
+            data {str | bytes} -- _description_
+            password {str} -- _description_
+
+        Returns:
+            str -- _description_
+        """
+        encryptor = SymmetricEncryption(password)
+        return encryptor.encrypt_with_metadata_return_str(data)
+
+    @staticmethod
+    def decrypt_data(data: str | bytes | PackageData, password: str) -> str:
+        """
+        Static method to decrypt some data
+
+        Arguments:
+            data {str | bytes | PackageData} -- _description_
+            password {str} -- _description_
+
+        Returns:
+            str -- _description_
+        """
+        decryptor = SymmetricEncryption(password)
+        return decryptor.decrypt_with_metadata(data, password=password)
+
+# __END__
diff --git a/test-run/encryption/symmetric_encryption.py b/test-run/encryption/symmetric_encryption.py
new file mode 100644
index 0000000..a7fcb76
--- /dev/null
+++ b/test-run/encryption/symmetric_encryption.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+"""
+Symmetric encryption test
+"""
+
+import json
+from corelibs.debug_handling.dump_data import dump_data
+from corelibs.encryption_handling.symmetric_encryption import SymmetricEncryption
+
+
+def main() -> None:
+    """
+    Comment
+    """
+    password = "strongpassword"
+    se = SymmetricEncryption(password)
+
+    plaintext = "Hello, World!"
+    ciphertext = se.encrypt_with_metadata_return_str(plaintext)
+    decrypted = se.decrypt_with_metadata(ciphertext)
+    print(f"Encrypted: {dump_data(json.loads(ciphertext))}")
+    print(f"Input: {plaintext} -> {decrypted}")
+
+    static_ciphertext = SymmetricEncryption.encrypt_data(plaintext, password)
+    decrypted = SymmetricEncryption.decrypt_data(static_ciphertext, password)
+    print(f"Static Encrypted: {dump_data(json.loads(static_ciphertext))}")
+    print(f"Input: {plaintext} -> {decrypted}")
+
+
+if __name__ == "__main__":
+    main()
+
+# __END__
diff --git a/tests/unit/encryption_handling/__init__.py b/tests/unit/encryption_handling/__init__.py
new file mode 100644
index 0000000..a81225c
--- /dev/null
+++ b/tests/unit/encryption_handling/__init__.py
@@ -0,0 +1,3 @@
+"""
+Unit tests for encryption_handling module
+"""
diff --git a/tests/unit/encryption_handling/test_symmetric_encryption.py b/tests/unit/encryption_handling/test_symmetric_encryption.py
new file mode 100644
index 0000000..8e4fa1e
--- /dev/null
+++ b/tests/unit/encryption_handling/test_symmetric_encryption.py
@@ -0,0 +1,665 @@
+"""
+PyTest: encryption_handling/symmetric_encryption
+"""
+# pylint: disable=redefined-outer-name
+# ^ Disabled because pytest fixtures intentionally redefine names
+
+import os
+import json
+import base64
+import hashlib
+import pytest
+from corelibs.encryption_handling.symmetric_encryption import (
+    SymmetricEncryption
+)
+
+
+class TestSymmetricEncryptionInitialization:
+    """Tests for SymmetricEncryption initialization"""
+
+    def test_valid_password_initialization(self):
+        """Test initialization with a valid password"""
+        encryptor = SymmetricEncryption("test_password")
+        assert encryptor.password == "test_password"
+        assert encryptor.password_hash == hashlib.sha256("test_password".encode('utf-8')).hexdigest()
+
+    def test_empty_password_raises_error(self):
+        """Test that empty password raises ValueError"""
+        with pytest.raises(ValueError, match="A password must be set"):
+            SymmetricEncryption("")
+
+    def test_password_hash_is_consistent(self):
+        """Test that password hash is consistently generated"""
+        encryptor1 = SymmetricEncryption("test_password")
+        encryptor2 = SymmetricEncryption("test_password")
+        assert encryptor1.password_hash == encryptor2.password_hash
+
+    def test_different_passwords_different_hashes(self):
+        """Test that different passwords produce different hashes"""
+        encryptor1 = SymmetricEncryption("password1")
+        encryptor2 = SymmetricEncryption("password2")
+        assert encryptor1.password_hash != encryptor2.password_hash
+
+
+class TestEncryptWithMetadataReturnDict:
+    """Tests for encrypt_with_metadata_return_dict method"""
+
+    def test_encrypt_string_returns_package_data(self):
+        """Test encrypting a string returns PackageData dict"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_dict("test data")
+
+        assert isinstance(result, dict)
+        assert 'encrypted_data' in result
+        assert 'salt' in result
+        assert 'key_hash' in result
+
+    def test_encrypt_bytes_returns_package_data(self):
+        """Test encrypting bytes returns PackageData dict"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_dict(b"test data")
+
+        assert isinstance(result, dict)
+        assert 'encrypted_data' in result
+        assert 'salt' in result
+        assert 'key_hash' in result
+
+    def test_encrypted_data_is_base64_encoded(self):
+        """Test that encrypted_data is base64 encoded"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_dict("test data")
+
+        # Should not raise exception when decoding
+        base64.urlsafe_b64decode(result['encrypted_data'])
+
+    def test_salt_is_base64_encoded(self):
+        """Test that salt is base64 encoded"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_dict("test data")
+
+        # Should not raise exception when decoding
+        salt = base64.urlsafe_b64decode(result['salt'])
+        # Salt should be 16 bytes
+        assert len(salt) == 16
+
+    def test_key_hash_is_valid_hex(self):
+        """Test that key_hash is a valid hex string"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_dict("test data")
+
+        # Should be 64 characters (SHA256 hex)
+        assert len(result['key_hash']) == 64
+        # Should only contain hex characters
+        int(result['key_hash'], 16)
+
+    def test_different_salts_for_each_encryption(self):
+        """Test that each encryption uses a different salt"""
+        encryptor = SymmetricEncryption("test_password")
+        result1 = encryptor.encrypt_with_metadata_return_dict("test data")
+        result2 = encryptor.encrypt_with_metadata_return_dict("test data")
+
+        assert result1['salt'] != result2['salt']
+        assert result1['encrypted_data'] != result2['encrypted_data']
+
+
+class TestEncryptWithMetadataReturnStr:
+    """Tests for encrypt_with_metadata_return_str method"""
+
+    def test_returns_json_string(self):
+        """Test that method returns a valid JSON string"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_str("test data")
+
+        assert isinstance(result, str)
+        # Should be valid JSON
+        parsed = json.loads(result)
+        assert 'encrypted_data' in parsed
+        assert 'salt' in parsed
+        assert 'key_hash' in parsed
+
+    def test_json_string_parseable(self):
+        """Test that returned JSON string can be parsed back"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_str("test data")
+
+        parsed = json.loads(result)
+        assert isinstance(parsed, dict)
+
+
+class TestEncryptWithMetadataReturnBytes:
+    """Tests for encrypt_with_metadata_return_bytes method"""
+
+    def test_returns_bytes(self):
+        """Test that method returns bytes"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_bytes("test data")
+
+        assert isinstance(result, bytes)
+
+    def test_bytes_contains_valid_json(self):
+        """Test that returned bytes contain valid JSON"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata_return_bytes("test data")
+
+        # Should be valid JSON when decoded
+        parsed = json.loads(result.decode('utf-8'))
+        assert 'encrypted_data' in parsed
+        assert 'salt' in parsed
+        assert 'key_hash' in parsed
+
+
+class TestEncryptWithMetadata:
+    """Tests for encrypt_with_metadata method with different return types"""
+
+    def test_return_as_str(self):
+        """Test encrypt_with_metadata with return_as='str'"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata("test data", return_as='str')
+
+        assert isinstance(result, str)
+        json.loads(result)  # Should be valid JSON
+
+    def test_return_as_json(self):
+        """Test encrypt_with_metadata with return_as='json'"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata("test data", return_as='json')
+
+        assert isinstance(result, str)
+        json.loads(result)  # Should be valid JSON
+
+    def test_return_as_bytes(self):
+        """Test encrypt_with_metadata with return_as='bytes'"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata("test data", return_as='bytes')
+
+        assert isinstance(result, bytes)
+
+    def test_return_as_dict(self):
+        """Test encrypt_with_metadata with return_as='dict'"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata("test data", return_as='dict')
+
+        assert isinstance(result, dict)
+        assert 'encrypted_data' in result
+
+    def test_default_return_type(self):
+        """Test encrypt_with_metadata default return type"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata("test data")
+
+        # Default should be 'str'
+        assert isinstance(result, str)
+
+    def test_invalid_return_type_defaults_to_str(self):
+        """Test that invalid return_as defaults to str"""
+        encryptor = SymmetricEncryption("test_password")
+        result = encryptor.encrypt_with_metadata("test data", return_as='invalid')
+
+        assert isinstance(result, str)
+
+
+class TestDecryptWithMetadata:
+    """Tests for decrypt_with_metadata method"""
+
+    def test_decrypt_string_package(self):
+        """Test decrypting a string JSON package"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+    def test_decrypt_bytes_package(self):
+        """Test decrypting a bytes JSON package"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_bytes("test data")
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+    def test_decrypt_dict_package(self):
+        """Test decrypting a dict PackageData"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_dict("test data")
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+    def test_decrypt_with_different_password_fails(self):
+        """Test that decrypting with wrong password fails"""
+        encryptor = SymmetricEncryption("password1")
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+
+        decryptor = SymmetricEncryption("password2")
+        with pytest.raises(ValueError, match="Key hash is not matching"):
+            decryptor.decrypt_with_metadata(encrypted)
+
+    def test_decrypt_with_explicit_password(self):
+        """Test decrypting with explicitly provided password"""
+        encryptor = SymmetricEncryption("password1")
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+
+        # Decrypt with different password parameter
+        decryptor = SymmetricEncryption("password1")
+        decrypted = decryptor.decrypt_with_metadata(encrypted, password="password1")
+
+        assert decrypted == "test data"
+
+    def test_decrypt_invalid_json_raises_error(self):
+        """Test that invalid JSON raises ValueError"""
+        encryptor = SymmetricEncryption("test_password")
+
+        with pytest.raises(ValueError, match="Invalid encrypted package format"):
+            encryptor.decrypt_with_metadata("not valid json")
+
+    def test_decrypt_missing_fields_raises_error(self):
+        """Test that missing required fields raises ValueError"""
+        encryptor = SymmetricEncryption("test_password")
+        invalid_package = json.dumps({"encrypted_data": "test"})
+
+        with pytest.raises(ValueError, match="Invalid encrypted package format"):
+            encryptor.decrypt_with_metadata(invalid_package)
+
+    def test_decrypt_unicode_data(self):
+        """Test encrypting and decrypting unicode data"""
+        encryptor = SymmetricEncryption("test_password")
+        unicode_data = "Hello 世界 🌍"
+        encrypted = encryptor.encrypt_with_metadata_return_str(unicode_data)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == unicode_data
+
+    def test_decrypt_empty_string(self):
+        """Test encrypting and decrypting empty string"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str("")
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == ""
+
+    def test_decrypt_long_data(self):
+        """Test encrypting and decrypting long data"""
+        encryptor = SymmetricEncryption("test_password")
+        long_data = "A" * 10000
+        encrypted = encryptor.encrypt_with_metadata_return_str(long_data)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == long_data
+
+
+class TestStaticMethods:
+    """Tests for static methods encrypt_data and decrypt_data"""
+
+    def test_encrypt_data_static_method(self):
+        """Test static encrypt_data method"""
+        encrypted = SymmetricEncryption.encrypt_data("test data", "test_password")
+
+        assert isinstance(encrypted, str)
+        # Should be valid JSON
+        parsed = json.loads(encrypted)
+        assert 'encrypted_data' in parsed
+        assert 'salt' in parsed
+        assert 'key_hash' in parsed
+
+    def test_decrypt_data_static_method(self):
+        """Test static decrypt_data method"""
+        encrypted = SymmetricEncryption.encrypt_data("test data", "test_password")
+        decrypted = SymmetricEncryption.decrypt_data(encrypted, "test_password")
+
+        assert decrypted == "test data"
+
+    def test_static_methods_roundtrip(self):
+        """Test complete roundtrip using static methods"""
+        original = "test data with special chars: !@#$%^&*()"
+        encrypted = SymmetricEncryption.encrypt_data(original, "test_password")
+        decrypted = SymmetricEncryption.decrypt_data(encrypted, "test_password")
+
+        assert decrypted == original
+
+    def test_static_decrypt_with_bytes(self):
+        """Test static decrypt_data with bytes input"""
+        encrypted = SymmetricEncryption.encrypt_data("test data", "test_password")
+        encrypted_bytes = encrypted.encode('utf-8')
+        decrypted = SymmetricEncryption.decrypt_data(encrypted_bytes, "test_password")
+
+        assert decrypted == "test data"
+
+    def test_static_decrypt_with_dict(self):
+        """Test static decrypt_data with PackageData dict"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted_dict = encryptor.encrypt_with_metadata_return_dict("test data")
+        decrypted = SymmetricEncryption.decrypt_data(encrypted_dict, "test_password")
+
+        assert decrypted == "test data"
+
+    def test_static_encrypt_bytes_data(self):
+        """Test static encrypt_data with bytes input"""
+        encrypted = SymmetricEncryption.encrypt_data(b"test data", "test_password")
+        decrypted = SymmetricEncryption.decrypt_data(encrypted, "test_password")
+
+        assert decrypted == "test data"
+
+
+class TestEncryptionSecurity:
+    """Security-related tests for encryption"""
+
+    def test_same_data_different_encryption(self):
+        """Test that same data produces different encrypted outputs due to salt"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted1 = encryptor.encrypt_with_metadata_return_str("test data")
+        encrypted2 = encryptor.encrypt_with_metadata_return_str("test data")
+
+        assert encrypted1 != encrypted2
+
+    def test_password_not_recoverable_from_hash(self):
+        """Test that password hash is one-way"""
+        encryptor = SymmetricEncryption("secret_password")
+        # The password_hash should be SHA256 hex (64 chars)
+        assert len(encryptor.password_hash) == 64
+        # Password should not be easily derivable from hash
+        assert "secret_password" not in encryptor.password_hash
+
+    def test_encrypted_data_not_plaintext(self):
+        """Test that encrypted data doesn't contain plaintext"""
+        encryptor = SymmetricEncryption("test_password")
+        plaintext = "very_secret_data_12345"
+        encrypted = encryptor.encrypt_with_metadata_return_str(plaintext)
+
+        # Plaintext should not appear in encrypted output
+        assert plaintext not in encrypted
+
+    def test_modified_encrypted_data_fails_decryption(self):
+        """Test that modified encrypted data fails to decrypt"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+
+        # Modify the encrypted data
+        encrypted_dict = json.loads(encrypted)
+        encrypted_dict['encrypted_data'] = encrypted_dict['encrypted_data'][:-5] + "AAAAA"
+        modified_encrypted = json.dumps(encrypted_dict)
+
+        # Should fail to decrypt
+        with pytest.raises(Exception):  # Fernet will raise an exception
+            encryptor.decrypt_with_metadata(modified_encrypted)
+
+    def test_modified_salt_fails_decryption(self):
+        """Test that modified salt fails to decrypt"""
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+
+        # Modify the salt
+        encrypted_dict = json.loads(encrypted)
+        original_salt = base64.urlsafe_b64decode(encrypted_dict['salt'])
+        modified_salt = bytes([b ^ 1 for b in original_salt])
+        encrypted_dict['salt'] = base64.urlsafe_b64encode(modified_salt).decode('utf-8')
+        modified_encrypted = json.dumps(encrypted_dict)
+
+        # Should fail to decrypt due to key hash mismatch
+        with pytest.raises(ValueError, match="Key hash is not matching"):
+            encryptor.decrypt_with_metadata(modified_encrypted)
+
+
+class TestEdgeCases:
+    """Edge case tests"""
+
+    def test_very_long_password(self):
+        """Test with very long password"""
+        long_password = "a" * 1000
+        encryptor = SymmetricEncryption(long_password)
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+    def test_special_characters_in_data(self):
+        """Test encryption of data with special characters"""
+        special_data = "!@#$%^&*()_+-=[]{}|;':\",./<>?\n\t\r"
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(special_data)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == special_data
+
+    def test_binary_data_utf8_bytes(self):
+        """Test encryption of UTF-8 encoded bytes"""
+        # Test with UTF-8 encoded bytes
+        utf8_bytes = "Hello 世界 🌍".encode('utf-8')
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(utf8_bytes)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "Hello 世界 🌍"
+
+    def test_binary_data_with_base64_encoding(self):
+        """Test encryption of arbitrary binary data using base64 encoding"""
+        # For arbitrary binary data, encode to base64 first
+        binary_data = bytes(range(256))
+        base64_encoded = base64.b64encode(binary_data).decode('utf-8')
+
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(base64_encoded)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        # Decode back to binary
+        decoded_binary = base64.b64decode(decrypted)
+        assert decoded_binary == binary_data
+
+    def test_binary_data_image_simulation(self):
+        """Test encryption of simulated binary image data"""
+        # Simulate image binary data (random bytes)
+        image_data = os.urandom(1024)  # 1KB of random binary data
+        base64_encoded = base64.b64encode(image_data).decode('utf-8')
+
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(base64_encoded)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        # Verify round-trip
+        decoded_data = base64.b64decode(decrypted)
+        assert decoded_data == image_data
+
+    def test_binary_data_with_null_bytes(self):
+        """Test encryption of data containing null bytes"""
+        # Create data with null bytes
+        data_with_nulls = "text\x00with\x00nulls\x00bytes"
+
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(data_with_nulls)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == data_with_nulls
+
+    def test_binary_data_bytes_input(self):
+        """Test encryption with bytes input directly"""
+        # UTF-8 compatible bytes
+        byte_data = b"Binary data test"
+
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(byte_data)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "Binary data test"
+
+    def test_binary_data_large_file_simulation(self):
+        """Test encryption of large binary data (simulated file)"""
+        # Simulate a larger binary file (10KB)
+        large_data = os.urandom(10240)
+        base64_encoded = base64.b64encode(large_data).decode('utf-8')
+
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(base64_encoded)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        # Verify integrity
+        decoded_data = base64.b64decode(decrypted)
+        assert len(decoded_data) == 10240
+        assert decoded_data == large_data
+
+    def test_binary_data_json_with_base64(self):
+        """Test encryption of JSON containing base64 encoded binary data"""
+        binary_data = os.urandom(256)
+        json_data = json.dumps({
+            "filename": "test.bin",
+            "data": base64.b64encode(binary_data).decode('utf-8'),
+            "size": len(binary_data)
+        })
+
+        encryptor = SymmetricEncryption("test_password")
+        encrypted = encryptor.encrypt_with_metadata_return_str(json_data)
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        # Parse and verify
+        parsed = json.loads(decrypted)
+        assert parsed["filename"] == "test.bin"
+        assert parsed["size"] == 256
+        decoded_binary = base64.b64decode(parsed["data"])
+        assert decoded_binary == binary_data
+
+    def test_numeric_password(self):
+        """Test with numeric string password"""
+        encryptor = SymmetricEncryption("12345")
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+    def test_unicode_password(self):
+        """Test with unicode password"""
+        encryptor = SymmetricEncryption("パスワード123")
+        encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+        decrypted = encryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+
+class TestIntegration:
+    """Integration tests"""
+
+    def test_multiple_encrypt_decrypt_cycles(self):
+        """Test multiple encryption/decryption cycles"""
+        encryptor = SymmetricEncryption("test_password")
+        original = "test data"
+
+        # Encrypt and decrypt multiple times
+        for _ in range(5):
+            encrypted = encryptor.encrypt_with_metadata_return_str(original)
+            decrypted = encryptor.decrypt_with_metadata(encrypted)
+            assert decrypted == original
+
+    def test_different_return_types_interoperability(self):
+        """Test that different return types can be decrypted"""
+        encryptor = SymmetricEncryption("test_password")
+        original = "test data"
+
+        # Encrypt with different return types
+        encrypted_str = encryptor.encrypt_with_metadata_return_str(original)
+        encrypted_bytes = encryptor.encrypt_with_metadata_return_bytes(original)
+        encrypted_dict = encryptor.encrypt_with_metadata_return_dict(original)
+
+        # All should decrypt to the same value
+        assert encryptor.decrypt_with_metadata(encrypted_str) == original
+        assert encryptor.decrypt_with_metadata(encrypted_bytes) == original
+        assert encryptor.decrypt_with_metadata(encrypted_dict) == original
+
+    def test_cross_instance_encryption_decryption(self):
+        """Test that different instances with same password can decrypt"""
+        encryptor1 = SymmetricEncryption("test_password")
+        encryptor2 = SymmetricEncryption("test_password")
+
+        encrypted = encryptor1.encrypt_with_metadata_return_str("test data")
+        decrypted = encryptor2.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+    def test_static_and_instance_methods_compatible(self):
+        """Test that static and instance methods are compatible"""
+        # Encrypt with static method
+        encrypted = SymmetricEncryption.encrypt_data("test data", "test_password")
+
+        # Decrypt with instance method
+        decryptor = SymmetricEncryption("test_password")
+        decrypted = decryptor.decrypt_with_metadata(encrypted)
+
+        assert decrypted == "test data"
+
+        # And vice versa
+        encryptor = SymmetricEncryption("test_password")
+        encrypted2 = encryptor.encrypt_with_metadata_return_str("test data 2")
+        decrypted2 = SymmetricEncryption.decrypt_data(encrypted2, "test_password")
+
+        assert decrypted2 == "test data 2"
+
+
+# Parametrized tests
+@pytest.mark.parametrize("data", [
+    "simple text",
+    "text with spaces and punctuation!",
+    "123456789",
+    "unicode: こんにちは",
+    "emoji: 🔐🔑",
+    "",
+    "a" * 1000,  # Long string
+])
+def test_encrypt_decrypt_various_data(data: str):
+    """Parametrized test for various data types"""
+    encryptor = SymmetricEncryption("test_password")
+    encrypted = encryptor.encrypt_with_metadata_return_str(data)
+    decrypted = encryptor.decrypt_with_metadata(encrypted)
+    assert decrypted == data
+
+
+@pytest.mark.parametrize("password", [
+    "simple",
+    "with spaces",
+    "special!@#$%",
+    "unicode世界",
+    "123456",
+    "a" * 100,  # Long password
+])
+def test_various_passwords(password: str):
+    """Parametrized test for various passwords"""
+    encryptor = SymmetricEncryption(password)
+    encrypted = encryptor.encrypt_with_metadata_return_str("test data")
+    decrypted = encryptor.decrypt_with_metadata(encrypted)
+    assert decrypted == "test data"
+
+
+@pytest.mark.parametrize("return_type,expected_type", [
+    ("str", str),
+    ("json", str),
+    ("bytes", bytes),
+    ("dict", dict),
+])
+def test_return_types_parametrized(return_type: str, expected_type: type):
+    """Parametrized test for different return types"""
+    encryptor = SymmetricEncryption("test_password")
+    result = encryptor.encrypt_with_metadata("test data", return_as=return_type)
+    assert isinstance(result, expected_type)
+
+
+# Fixtures
+@pytest.fixture
+def encryptor() -> SymmetricEncryption:
+    """Fixture providing a basic encryptor instance"""
+    return SymmetricEncryption("test_password")
+
+
+@pytest.fixture
+def sample_encrypted_data(encryptor: SymmetricEncryption) -> str:
+    """Fixture providing sample encrypted data"""
+    return encryptor.encrypt_with_metadata_return_str("sample data")
+
+
+def test_with_encryptor_fixture(encryptor: SymmetricEncryption) -> None:
+    """Test using encryptor fixture"""
+    encrypted: str = encryptor.encrypt_with_metadata_return_str("test")
+    decrypted: str = encryptor.decrypt_with_metadata(encrypted)
+    assert decrypted == "test"
+
+
+def test_with_encrypted_data_fixture(encryptor: SymmetricEncryption, sample_encrypted_data: str) -> None:
+    """Test using encrypted data fixture"""
+    decrypted: str = encryptor.decrypt_with_metadata(sample_encrypted_data)
+    assert decrypted == "sample data"
+
+# __END__
diff --git a/uv.lock b/uv.lock
index 4ac9997..4f0cf30 100644
--- a/uv.lock
+++ b/uv.lock
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 ]
 
+[[package]]
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+version = "2.0.0"
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 version = "3.4.3"
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 [[package]]
 name = "corelibs"
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+version = "0.25.1"
 source = { editable = "." }
 dependencies = [
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     { name = "psutil" },
     { name = "requests" },
@@ -69,6 +115,7 @@ dev = [
 
 [package.metadata]
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