Java 使用AES加密解密

港控/mmm° 2023-05-31 15:19 5阅读 0赞

package com.lzw.aes;
    import java.io.UnsupportedEncodingException;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.spec.SecretKeySpec;
    
    /**
     * 此处使用AES-128-ECB加密模式，key需要为16位。
     * @author lzw
     * @Date 2019年10月18日
     */
    public class Aes {
    
    	/**
    	 * @param args
    	 * @throws Exception
    	 */
    	public static void main(String[] args) throws Exception {
    		//密钥
    		String cKey = "1234567890defghi";
    		// 需要加密的字串
    		String cSrc = "Abc123";
    		System.out.println(cSrc);
    		// 加密
    		String enString = Aes.Encrypt(cSrc, cKey);
    		System.out.println("加密后的字串是：" + enString);
    
    		// 解密
    		String DeString = Aes.Decrypt(enString, cKey);
    		System.out.println("解密后的字串是：" + DeString);
    
    	}
    
    	/**
    	 * 二进制转换成十六进制
    	 * 
    	 * @param buf
    	 * @return
    	 */
    	private 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();
    	}
    
    	/**
    	 * 	加密
    	 * @param sSrc  待加密的密码
    	 * @param sKey	解密密钥
    	 * @return
    	 * @throws Exception
    	 */
        public static String Encrypt(String sSrc, String sKey) {
        	
    		try {
    			byte[] raw = sKey.getBytes("ASCII");
    		    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    		    Cipher cipher  = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
    			cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    		    byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
    			return parseByte2HexStr(encrypted);
    		} catch (IllegalBlockSizeException e) {
    			e.printStackTrace();
    		} catch (BadPaddingException e) {
    			e.printStackTrace();
    		} catch (UnsupportedEncodingException e) {
    			e.printStackTrace();
    		} catch (InvalidKeyException e) {
    			e.printStackTrace();
    		} catch (NoSuchPaddingException e) {
    			e.printStackTrace();
    		} catch (NoSuchAlgorithmException e) {
    			e.printStackTrace();
    		}
          return null;
        }
    
    	/**
    	 * 解密
    	 * 
    	 * @param sSrc
    	 *            待解密的密码
    	 * @param sKey
    	 *            解密密钥
    	 * @return
    	 * @throws Exception
    	 */
    	public static String Decrypt(String sSrc, String sKey) {
    		try {
    			byte[] raw = sKey.getBytes("utf-8");
    			SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    			cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    			byte[] encrypted = parseHexStr2Byte(sSrc);
    			byte[] original = cipher.doFinal(encrypted);
    			return new String(original, "utf-8");
    		} catch (IllegalBlockSizeException e) {
    			e.printStackTrace();
    		} catch (BadPaddingException e) {
    			e.printStackTrace();
    		} catch (UnsupportedEncodingException e) {
    			e.printStackTrace();
    		} catch (InvalidKeyException e) {
    			e.printStackTrace();
    		} catch (NoSuchPaddingException e) {
    			e.printStackTrace();
    		} catch (NoSuchAlgorithmException e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	/**
    	 * 十六进制转换成二进制
    	 * 
    	 * @param hexStr
    	 * @return
    	 */
    	private 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;
    	}
    
    }