Initial commit

.idea/.gitignore

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+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/inspectionProfiles/profiles_settings.xml

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+<component name="InspectionProjectProfileManager">
+  <settings>
+    <option name="USE_PROJECT_PROFILE" value="false" />
+    <version value="1.0" />
+  </settings>
+</component>

.idea/material_theme_project_new.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MaterialThemeProjectNewConfig">
+    <option name="metadata">
+      <MTProjectMetadataState>
+        <option name="userId" value="-a35cb17:193adf3a2bf:-7ff2" />
+      </MTProjectMetadataState>
+    </option>
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.13" project-jdk-type="Python SDK" />
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/应用密码学课设.iml" filepath="$PROJECT_DIR$/.idea/应用密码学课设.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings" defaultProject="true" />
+</project>

.idea/应用密码学课设.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PYTHON_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="jdk" jdkName="Python 3.13" jdkType="Python SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

encryption_utils.py

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+from Crypto.PublicKey import RSA
+from Crypto.Cipher import PKCS1_OAEP, AES
+from Crypto.Random import get_random_bytes
+
+
+class AsymmetricEncryption:
+    def __init__(self):
+        self.key_pair = RSA.generate(2048)
+
+    def get_public_key(self):
+        return self.key_pair.publickey()
+
+    def get_private_key(self):
+        return self.key_pair
+
+    def encrypt_with_public_key(self, data, public_key):
+        cipher_rsa = PKCS1_OAEP.new(public_key)
+        return cipher_rsa.encrypt(data)
+
+    def decrypt_with_private_key(self, encrypted_data):
+        cipher_rsa = PKCS1_OAEP.new(self.key_pair)
+        return cipher_rsa.decrypt(encrypted_data)
+
+
+class SymmetricEncryption:
+    def encrypt(self, data, key):
+        cipher_aes = AES.new(key, AES.MODE_GCM)
+        nonce = cipher_aes.nonce
+        ciphertext, tag = cipher_aes.encrypt_and_digest(data)
+        return nonce, ciphertext, tag
+
+    def decrypt(self, nonce, ciphertext, tag, key):
+        cipher_aes = AES.new(key, AES.MODE_GCM, nonce=nonce)
+        return cipher_aes.decrypt_and_verify(ciphertext, tag)

example.txt

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+123456
+adgjl

receiver.py

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+import base64
+from encryption_utils import SymmetricEncryption, AsymmetricEncryption, calculate_file_hash
+
+class Receiver:
+    def __init__(self, private_key):
+        self.private_key = private_key
+
+    def receive_file(self, encoded_data_packet):
+        decoded_data_packet = base64.b64decode(encoded_data_packet)
+
+        nonce = decoded_data_packet[:16]
+        ciphertext = decoded_data_packet[16:-256-64]
+        tag = decoded_data_packet[-256-64:-256]
+        encrypted_symmetric_key = decoded_data_packet[-256:]
+        original_hash = decoded_data_packet[-256-64:-256]  # 保持为字节
+
+        asymmetric_encryption = AsymmetricEncryption()
+        decrypted_symmetric_key = asymmetric_encryption.decrypt_with_private_key(encrypted_symmetric_key)
+
+        symmetric_encryption = SymmetricEncryption()
+        decrypted_file_data = symmetric_encryption.decrypt(nonce, ciphertext, tag, decrypted_symmetric_key)
+
+        # Recalculate hash of decrypted file data
+        received_file_hash = calculate_file_hash(decrypted_file_data).encode()
+
+        if received_file_hash == original_hash:
+            print("文件传输成功，文件完整性验证通过。")
+        else:
+            print("文件传输失败，文件可能已被篡改。")
+
+        return decrypted_file_data

run_example.py

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+from encryption_utils import AsymmetricEncryption, SymmetricEncryption
+from Crypto.Random import get_random_bytes
+
+def run_example():
+    # 生成接收方的密钥对
+    receiver_asymmetric = AsymmetricEncryption()
+    receiver_public_key = receiver_asymmetric.get_public_key()
+    receiver_private_key = receiver_asymmetric.get_private_key()
+
+    # 生成对称密钥
+    symmetric_key = get_random_bytes(16)  # AES 128 位密钥
+
+    # 使用接收方的公钥加密对称密钥
+    encrypted_symmetric_key = receiver_asymmetric.encrypt_with_public_key(symmetric_key, receiver_public_key)
+
+    # 读取文件内容
+    with open('example.txt', 'rb') as file:
+        file_data = file.read()
+
+    # 使用对称密钥加密文件内容
+    symmetric_encryption = SymmetricEncryption()
+    nonce, ciphertext, tag = symmetric_encryption.encrypt(file_data, symmetric_key)
+
+    # 模拟发送和接收
+    encoded_packet = (encrypted_symmetric_key, nonce, ciphertext, tag)
+
+    # 使用接收方私钥解密对称密钥
+    decrypted_symmetric_key = receiver_asymmetric.decrypt_with_private_key(encoded_packet[0])
+
+    # 使用解密后的对称密钥解密文件内容
+    decrypted_data = symmetric_encryption.decrypt(encoded_packet[1], encoded_packet[2], encoded_packet[3], decrypted_symmetric_key)
+    print("Decrypted Data:", decrypted_data.decode('utf-8'))
+
+if __name__ == "__main__":
+    run_example()

sender.py

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+import base64
+from Crypto.Random import get_random_bytes  # 确保导入随机字节生成函数
+from encryption_utils import SymmetricEncryption, AsymmetricEncryption, calculate_file_hash
+
+class Sender:
+    def __init__(self, filepath, receiver_public_key):
+        self.filepath = filepath
+        self.receiver_public_key = receiver_public_key
+
+    def send_file(self):
+        with open(self.filepath, 'rb') as f:
+            file_data = f.read()
+
+        symmetric_key = get_random_bytes(16)
+        symmetric_encryption = SymmetricEncryption()
+        nonce, ciphertext, tag = symmetric_encryption.encrypt(file_data, symmetric_key)
+
+        file_hash = calculate_file_hash(file_data)
+
+        asymmetric_encryption = AsymmetricEncryption()
+        encrypted_symmetric_key = asymmetric_encryption.encrypt_with_public_key(symmetric_key, self.receiver_public_key)
+
+        encoded_data_packet = base64.b64encode(nonce + ciphertext + tag + encrypted_symmetric_key + file_hash.encode())
+
+        return encoded_data_packet