95 lines
3.4 KiB
Java
95 lines
3.4 KiB
Java
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package com.cowr.common.utils;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.io.UnsupportedEncodingException;
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import java.security.GeneralSecurityException;
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import java.util.Arrays;
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public class AESUtil {
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public static byte[] encrypt(String key, byte[] origData) throws GeneralSecurityException {
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byte[] keyBytes = getKeyBytes(key);
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byte[] buf = new byte[16];
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System.arraycopy(keyBytes, 0, buf, 0, keyBytes.length > buf.length ? keyBytes.length : buf.length);
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
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cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(buf, "AES"), new IvParameterSpec(keyBytes));
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return cipher.doFinal(origData);
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}
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public static byte[] decrypt(String key, byte[] crypted) throws GeneralSecurityException {
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byte[] keyBytes = getKeyBytes(key);
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byte[] buf = new byte[16];
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System.arraycopy(keyBytes, 0, buf, 0, keyBytes.length > buf.length ? keyBytes.length : buf.length);
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
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cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(buf, "AES"), new IvParameterSpec(keyBytes));
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return cipher.doFinal(crypted);
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}
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private static byte[] getKeyBytes(String key) {
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byte[] bytes = key.getBytes();
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return bytes.length == 16 ? bytes : Arrays.copyOf(bytes, 16);
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}
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public static String encrypt(String key, String val) throws GeneralSecurityException {
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byte[] origData = val.getBytes();
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byte[] crypted = encrypt(key, origData);
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return parseByte2HexStr(crypted);
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}
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public static String decrypt(String key, String val) throws GeneralSecurityException, UnsupportedEncodingException {
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byte[] crypted = parseHexStr2Byte(val);
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byte[] origData = decrypt(key, crypted);
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return new String(origData, "utf-8");
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}
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/**
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* 将二进制转换成16进制
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*
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* @param buf
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* @return
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*/
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public static String parseByte2HexStr(byte buf[]) {
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < buf.length; i++) {
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String hex = Integer.toHexString(buf[i] & 0xFF);
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if (hex.length() == 1) {
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hex = '0' + hex;
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}
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sb.append(hex.toUpperCase());
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}
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return sb.toString();
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}
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/**
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* 将16进制转换为二进制
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*
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* @param hexStr
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* @return
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*/
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public static byte[] parseHexStr2Byte(String hexStr) {
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if (hexStr.length() < 1)
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return null;
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byte[] result = new byte[hexStr.length() / 2];
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for (int i = 0; i < hexStr.length() / 2; i++) {
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int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
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int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
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result[i] = (byte) (high * 16 + low);
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}
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return result;
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}
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public static void main(String[] args) throws Exception {
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String content = "加密之前加密之前加密之前";
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String password = "21";
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System.out.println("加密之前：" + content);
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String hexStrResult = encrypt(password, content);
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System.out.println("加密之后：" + hexStrResult);
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System.out.println("解密后的内容：" + decrypt(password, hexStrResult));
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}
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}
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