Java AES/DES加密&解密
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2024-03-13 23:04:23
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DES
DES加密&解密代码如下:
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.nio.charset.Charset;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
/**
* ${DESCRIPTION}
*
* @author Ricky Fung
*/
public class DES {
public static final Charset UTF8 = Charset.forName("UTF-8");
public static final String DES_ALGORITHM = "DES";
public static byte[] encrypt(String data, String key) throws Exception {
return encrypt(data.getBytes(UTF8), key.getBytes(UTF8));
}
public static byte[] encrypt(String data, byte[] key) throws Exception {
return encrypt(data.getBytes(UTF8), key);
}
public static byte[] encrypt(byte[] data, String key) throws Exception {
return encrypt(data, key.getBytes(UTF8));
}
public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
SecretKey secretKey = generateSecretKey(key);
Cipher cipher = Cipher.getInstance(DES_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
return cipher.doFinal(data);
}
public static byte[] decrypt(String data, String key) throws Exception {
return decrypt(data.getBytes(UTF8), key.getBytes(UTF8));
}
public static byte[] decrypt(String data, byte[] key) throws Exception {
return decrypt(data.getBytes(UTF8), key);
}
public static byte[] decrypt(byte[] data, String key) throws Exception {
return decrypt(data, key.getBytes(UTF8));
}
public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
SecretKey secretKey = generateSecretKey(key);
Cipher cipher = Cipher.getInstance(DES_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
return cipher.doFinal(data);
}
private static SecretKey generateSecretKey(byte[] key) throws NoSuchAlgorithmException {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(key);
KeyGenerator kg = KeyGenerator.getInstance(DES_ALGORITHM);
kg.init(secureRandom);
return kg.generateKey();
}
}
AES
AES加密&解密代码如下:
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.Charset;
import java.security.Key;
/**
* ${DESCRIPTION}
*
* @author Ricky Fung
*/
public class AES {
public static final String KEY_ALGORITHM = "AES";
public static final String CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
public static final Charset UTF8 = Charset.forName("UTF-8");
public static byte[] encrypt(String data, String key) throws Exception{
return encrypt(data.getBytes(UTF8), key.getBytes(UTF8));
}
public static byte[] encrypt(String data, byte[] key) throws Exception{
return encrypt(data.getBytes(UTF8), key);
}
public static byte[] encrypt(byte[] data, String key) throws Exception{
return encrypt(data, key.getBytes(UTF8));
}
public static byte[] encrypt(byte[] data, byte[] key) throws Exception{
Key k = genSecretKey(key);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, k);
return cipher.doFinal(data);
}
public static byte[] decrypt(String data, String key) throws Exception {
return decrypt(data.getBytes(UTF8), key.getBytes(UTF8));
}
public static byte[] decrypt(String data, byte[] key) throws Exception {
return decrypt(data.getBytes(UTF8), key);
}
public static byte[] decrypt(byte[] data, String key) throws Exception {
return decrypt(data, key.getBytes(UTF8));
}
public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
Key k = genSecretKey(key);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, k);
return cipher.doFinal(data);
}
/**AES only supports key sizes of 16, 24 or 32 bytes*/
public static Key genSecretKey(byte[] key) throws Exception{
if(key.length==16 || key.length==24 || key.length==32){
return new SecretKeySpec(key, KEY_ALGORITHM);
}
throw new IllegalArgumentException("AES only supports key sizes of 16, 24 or 32 bytes");
}
}
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