给出一段CBC的分组加密模式的代码
时间: 2023-12-14 22:39:14 浏览: 18
以下是一个使用CBC模式进行分组加密的示例代码:
```python
from Crypto.Cipher import AES
import os
# 16-byte secret key
key = os.urandom(16)
# 16-byte initialization vector
iv = os.urandom(16)
# plaintext to be encrypted (must be a multiple of 16 bytes)
plaintext = b'This is a secret message'
# create the AES cipher object
cipher = AES.new(key, AES.MODE_CBC, iv)
# encrypt the plaintext using CBC mode
ciphertext = cipher.encrypt(plaintext)
print("Key:", key.hex())
print("IV:", iv.hex())
print("Ciphertext:", ciphertext.hex())
```
在上面的代码中,我们使用了Crypto库的AES模块来创建了一个AES加密的对象。我们传入了一个16字节的密钥(key)以及一个16字节的初始化向量(iv),并且使用了CBC模式。最后,我们对明文(plaintext)进行了加密,并且打印出了密文(ciphertext)、密钥以及初始化向量。
相关问题
des 加密cbc模式java代码实现
以下是使用Java实现DES加密CBC模式的示例代码:
```java
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class DesCbcEncryption {
public static void main(String[] args) throws Exception {
String key = "01234567"; // 8-byte key
String iv = "abcdefgh"; // 8-byte IV
String plaintext = "Hello world!";
byte[] encrypted = encrypt(plaintext, key, iv);
String encryptedBase64 = Base64.getEncoder().encodeToString(encrypted);
System.out.println("Encrypted: " + encryptedBase64);
String decrypted = decrypt(encrypted, key, iv);
System.out.println("Decrypted: " + decrypted);
}
public static byte[] encrypt(String plaintext, String key, String iv) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "DES");
IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
return cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));
}
public static String decrypt(byte[] ciphertext, String key, String iv) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "DES");
IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
byte[] decrypted = cipher.doFinal(ciphertext);
return new String(decrypted, StandardCharsets.UTF_8);
}
}
```
其中,`encrypt`方法用于加密明文,`decrypt`方法用于解密密文。在此示例中,使用了8字节的密钥和8字节的IV,使用了DES算法和CBC模式,并将结果进行了Base64编码。注意,CBC模式需要指定一个初始化向量(IV),它与密钥一样需要保密。在实际应用中,IV需要每次加密时都随机生成并保存,以增强安全性。
des 加密cbc模式JAVA代码实现
以下是使用Java实现DES加密CBC模式的示例代码:
```java
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class DesCbcEncryption {
public static void main(String[] args) throws Exception {
String key = "01234567"; // 8-byte key
String iv = "abcdefgh"; // 8-byte IV
String plaintext = "Hello world!";
byte[] encrypted = encrypt(plaintext, key, iv);
String encryptedBase64 = Base64.getEncoder().encodeToString(encrypted);
System.out.println("Encrypted: " + encryptedBase64);
String decrypted = decrypt(encrypted, key, iv);
System.out.println("Decrypted: " + decrypted);
}
public static byte[] encrypt(String plaintext, String key, String iv) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "DES");
IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
return cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));
}
public static String decrypt(byte[] ciphertext, String key, String iv) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "DES");
IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
byte[] decrypted = cipher.doFinal(ciphertext);
return new String(decrypted, StandardCharsets.UTF_8);
}
}
```
其中,`encrypt`方法用于加密明文,`decrypt`方法用于解密密文。在此示例中,使用了8字节的密钥和8字节的IV,使用了DES算法和CBC模式,并将结果进行了Base64编码。注意,CBC模式需要指定一个初始化向量(IV),它与密钥一样需要保密。在实际应用中,IV需要每次加密时都随机生成并保存,以增强安全性。