import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* @author 【轟隆隆】
*
*/
public class AES {
/**
* AES加密算法
*/
public AES() {
}
/**
* 加密
* @param content 需要加密的內容
* @param keyWord 加密密鑰
* @return byte[] 加密后的字節數組
*/
public static byte[] encrypt(String content, String keyWord) {
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
secureRandom.setSeed(keyWord.getBytes());
kgen.init(128,secureRandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES");// 創建密碼器
byte[] byteContent = content.getBytes("utf-8");
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(byteContent);
return result; // 加密
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/**
* @param content 需要加密的內容
* @param password 加密密鑰
* @return String 加密后的字符串
*/
public static String encrypttoStr(String content, String password){
return parseByte2HexStr(encrypt(content,password));
}
/**解密
* @param content 待解密內容
* @param keyWord 解密密鑰
* @return byte[]
*/
public static byte[] decrypt(byte[] content, String keyWord) {
try {
KeyGenerator kgen = KeyGenerator.getInstance("AES");
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
secureRandom.setSeed(keyWord.getBytes());
kgen.init(128,secureRandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance("AES");// 創建密碼器
cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(content);
return result; // 加密
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/**
* @param content 待解密內容(字符串)
* @param keyWord 解密密鑰
* @return byte[]
*/
public static byte[] decrypt(String content, String keyWord) {
return decrypt(parseHexStr2Byte(content),keyWord);
}
/**將二進制轉換成16進制
* @param buf
* @return String
*/
public static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
/**將16進制轉換為二進制
* @param hexStr
* @return byte[]
*/
public static byte[] parseHexStr2Byte(String hexStr) {
if (hexStr.length() < 1)
return null;
byte[] result = new byte[hexStr.length()/2];
for (int i = 0;i< hexStr.length()/2; i++) {
int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);
int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);
result[i] = (byte) (high * 16 + low);
}
return result;
}
public static void main(String[] args) {
String content = "HongLonglong";
String Key = "http://www.honglonglong.com";
//加密
System.out.println("加密前：" + content);
String encryptResult = encrypttoStr(content, Key);
System.out.println("加密后：" + encryptResult);
//解密
byte[] decryptResult = decrypt(encryptResult,Key);
System.out.println("解密后：" + new String(decryptResult));
}
}
運行結果：
加密前：HongLonglong
加密后：CE95560CBEA0996DE05D230EE8ABB1F1