AES算法加解密Java工具类AESUtil

AES算法加解密Java工具类

import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * AES对称算法
 *
 * @author chenxy
 */
public final class AESUtil {

	/**
	 * 解密
	 *
	 * @param content  解密内容
	 * @param password 解密密码
	 * @return
	 * @throws Exception
	 */
	public static byte[] decrypt(byte[] content, String password) throws Exception {
		KeyGenerator kgen = KeyGenerator.getInstance("AES");
		// 防止linux下 随机生成key
		SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
		secureRandom.setSeed(password.getBytes());
		kgen.init(128, secureRandom);
		SecretKey secretKey = kgen.generateKey();
		byte[] enCodeFormat = secretKey.getEncoded();
		SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
		Cipher cipher = Cipher.getInstance("AES");
		cipher.init(Cipher.DECRYPT_MODE, key);
		return cipher.doFinal(content);
	}

	/**
	 * 加密
	 *
	 * @param content  加密内容
	 * @param password 加密密码
	 * @return
	 * @throws Exception
	 */
	public static byte[] encrypt(byte[] content, String password) throws Exception {
		KeyGenerator kgen = KeyGenerator.getInstance("AES");
		// 防止linux下 随机生成key
		SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
		secureRandom.setSeed(password.getBytes());
		kgen.init(128, secureRandom);
		SecretKey secretKey = kgen.generateKey();
		byte[] enCodeFormat = secretKey.getEncoded();
		SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
		Cipher cipher = Cipher.getInstance("AES");
		cipher.init(Cipher.ENCRYPT_MODE, key);
		return cipher.doFinal(content);
	}

	/**
	 * 将二进制转换成16进制
	 *
	 * @param buf
	 * @return
	 */
	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();
	}

	/**
	 * 将16进制转换为二进制
	 *
	 * @param hexStr
	 * @return
	 */
	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;
	}

	private AESUtil() {
	}
}