jar包：bcprov-jdk15-133.jar
package aes256;
import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* @author 47475
*
*/
public class AES256Encryption {
/**
* 密钥算法
*/
private static final String KEY_ALGORITHM = "AES";
/**
* 加解密算法/工作模式/填充方式
*/
private static final String CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
public static byte[] initkey() throws Exception {
// 实例化密钥生成器
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM, "BC");// BC是算法提供者
kg.init(256);
// kg.init(128);
// 生成秘钥
SecretKey secretKey = kg.generateKey();
return secretKey.getEncoded();
}
/** 默认的秘钥key */
public static byte[] initRootKey() throws Exception {
return new byte[] { 0x08, 0x08, 0x04, 0x0b, 0x02, 0x0f, 0x0b, 0x0c, 0x01, 0x03, 0x09, 0x07, 0x0c, 0x03, 0x07,
0x0a, 0x04, 0x0f, 0x06, 0x0f, 0x0e, 0x09, 0x05, 0x01, 0x0a, 0x0a, 0x01, 0x09, 0x06, 0x07, 0x09, 0x0d };
}
/** 根据给定的enCodeFormat字节数组构造一个用AES算法加密的密钥 */
public static Key toKey(byte[] key) throws Exception {
SecretKey secretKey = new SecretKeySpec(key, KEY_ALGORITHM);
return secretKey;
}
/**
* 加密
*
* @param data 要加密的数据
* @param key 秘钥
* @return
* @throws Exception
*/
public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
Key k = toKey(key);
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM, "BC");
cipher.init(Cipher.ENCRYPT_MODE, k);// ENCRYPT_MODE,用于初始化cipher的加密模式的常量
return cipher.doFinal(data);
}
public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
Key k = toKey(key);
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM, "BC");
cipher.init(Cipher.DECRYPT_MODE, k);// DECRYPT_MODE,用于初始化cipher的解密模式的常量。
return cipher.doFinal(data);
}
public static void main(String[] args) throws UnsupportedEncodingException {
String str = "abc123@-_.:; 空格";
// 打印原文
System.out.println("原文：" + str);
// 密钥
byte[] key;
try {
// 生成随机密钥
key = AES256Encryption.initkey();
// 打印密钥
System.out.print("密钥：");
for (int i = 0; i < key.length; i++) {
System.out.printf("%x", key[i]);// %x十六进制数形式输出整数
}
System.out.println();
// 加密
byte[] data = AES256Encryption.encrypt(str.getBytes(), key);
// 打印密文
System.out.print("加密后：");
for (int i = 0; i < data.length; i++) {
System.out.printf("%x", data[i]);
}
System.out.println();
// 解密密文
data = AES256Encryption.decrypt(data, key);
// 打印原文
System.out.println("解密后：" + new String(data));
} catch (Exception e) {
e.printStackTrace();
}
}
}
