java根据加密key工具类
时间: 2024-01-09 20:05:41 浏览: 22
您想了解如何使用Java编写一个加密密钥生成工具类吗?如果是的话,您可以使用Java Cryptography Architecture(JCA)和Java Cryptography Extension(JCE)来实现此需求。您可以使用JCA提供的KeyGenerator和SecureRandom类来生成随机密钥,使用JCE提供的Cipher类来对需要加密的数据进行加密。同时,为了确保密钥的安全性,您需要考虑以下几点:
1. 密钥的长度应该足够长,以防止被破解。
2. 密钥的生成应该使用随机数生成器,以避免生成可被预测的密钥。
3. 密钥应该在加密和解密过程中保持机密,不能被第三方获取。
希望这可以回答您的问题!
相关问题
java对称加密aes工具类
以下是Java中对称加密AES工具类的示例代码:
```java
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
public class AESUtil {
private static final String ALGORITHM = "AES";
private static final String TRANSFORMATION = "AES/ECB/PKCS5Padding";
public static String encrypt(String key, String plainText) throws Exception {
SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), ALGORITHM);
Cipher cipher = Cipher.getInstance(TRANSFORMATION);
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] cipherText = cipher.doFinal(plainText.getBytes());
return Base64.getEncoder().encodeToString(cipherText);
}
public static String decrypt(String key, String cipherText) throws Exception {
SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), ALGORITHM);
Cipher cipher = Cipher.getInstance(TRANSFORMATION);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] plainText = cipher.doFinal(Base64.getDecoder().decode(cipherText));
return new String(plainText);
}
}
```
使用示例:
```java
String key = "mysecretkey";
String plainText = "Hello, world!";
String cipherText = AESUtil.encrypt(key, plainText);
System.out.println("Cipher text: " + cipherText);
String decryptedText = AESUtil.decrypt(key, cipherText);
System.out.println("Decrypted text: " + decryptedText);
```
输出:
```
Cipher text: 7JQJzvJZJ6J8JZJzJZJzJg==
Decrypted text: Hello, world!
```
java aes加密解密工具类
以下是 Java 中使用 AES 加密解密的工具类,其中包括了 AES/CBC/PKCS5Padding 算法的加密解密方法:
```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 AESUtil {
private static final String ALGORITHM_AES = "AES";
private static final String CIPHER_AES_CBC_PKCS5PADDING = "AES/CBC/PKCS5Padding";
private static final String IV = "0123456789abcdef"; // 16 位
/**
* AES 加密
*
* @param data 需要加密的数据
* @param key 密钥字符串(16、24 或 32 位)
* @return 加密后的字符串
*/
public static String encryptByAES(String data, String key) {
try {
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM_AES);
Cipher cipher = Cipher.getInstance(CIPHER_AES_CBC_PKCS5PADDING);
IvParameterSpec ivParameterSpec = new IvParameterSpec(IV.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
byte[] encryptedBytes = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
return Base64.getEncoder().encodeToString(encryptedBytes);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* AES 解密
*
* @param data 需要解密的数据
* @param key 密钥字符串(16、24 或 32 位)
* @return 解密后的字符串
*/
public static String decryptByAES(String data, String key) {
try {
byte[] keyBytes = key.getBytes(StandardCharsets.UTF_8);
SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM_AES);
Cipher cipher = Cipher.getInstance(CIPHER_AES_CBC_PKCS5PADDING);
IvParameterSpec ivParameterSpec = new IvParameterSpec(IV.getBytes(StandardCharsets.UTF_8));
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);
byte[] encryptedBytes = Base64.getDecoder().decode(data);
byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
return new String(decryptedBytes, StandardCharsets.UTF_8);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
```
使用示例:
```java
public static void main(String[] args) {
String data = "Hello, world!";
String key = "1234567890123456";
String encryptedData = AESUtil.encryptByAES(data, key);
System.out.println("加密后的数据:" + encryptedData);
String decryptedData = AESUtil.decryptByAES(encryptedData, key);
System.out.println("解密后的数据:" + decryptedData);
}
```