1、kgen.init(128, new SecureRandom(password.getBytes();SecretKey secretKey = kgen.generateKey();byte enCodeFormat = secretKey.getEncoded();SecretKeySpec key = new SecretKeySpec(enCodeFormat, Cipher cipher = Cipher.getInstance(/ 创建密码器byte byteContent = content.getBytes(utf-8cipher.init(Cipher.ENCRYPT_MO
2、DE, 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(); cat
3、ch (IllegalBlockSizeException e) e.printStackTrace(); catch (BadPaddingException e) e.printStackTrace();return null;/* 加密* param content 需要加密的内容* param password 加密密码* return*/public static byte encrypt(String content, String password) try KeyGenerator kgen = KeyGenerator.getInstance(2.2 解密代码有详细注释,不多
4、废话注意:解密的时候要传入byte数组view plaincopy to clipboardprint?/*解密* param content 待解密内容* param password 解密密钥* return*/public static byte decrypt(byte content, String password) try KeyGenerator kgen = KeyGenerator.getInstance(/ 创建密码器cipher.init(Cipher.DECRYPT_MODE, key);/ 初始化byte result = cipher.doFinal(conten
5、t);/*解密* param content 待解密内容* param password 解密密钥* return*/public static byte decrypt(byte content, String password) try KeyGenerator kgen = KeyGenerator.getInstance(2.3 测试代码String content = test;String password = 12345678/加密System.out.println(加密前: + content);byte encryptResult = encrypt(content, pa
6、ssword);/解密byte decryptResult = decrypt(encryptResult,password);System.out.println(解密后: + new String(decryptResult);String content = 输出结果如下:加密前:test解密后:test2.4 容易出错的地方但是如果我们将测试代码修改一下,如下:try String encryptResultStr = new String(encryptResult,/解密byte decryptResult = decrypt(encryptResultStr.getBytes()
7、,password);String content = 则,系统会报出如下异常:javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipherat com.sun.crypto.provider.SunJCE_f.b(DashoA13*.)at com.sun.crypto.provider.SunJCE_f.b(DashoA13*.)at com.sun.crypto.provider.AESCipher.engineDoFinal(D
8、ashoA13*.)at javax.crypto.Cipher.doFinal(DashoA13*.)这主要是因为加密后的byte数组是不能强制转换成字符串的,换言之:字符串和byte数组在这种情况下不是互逆的;要避免这种情况,我们需要做一些修订,可以考虑将二进制数据转换成十六进制表示,主要有如下两个方法:2.4.1将二进制转换成16进制/*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
9、 = 0; i String hex = Integer.toHexString(bufi & 0xFF);if (hex.length() = 1) hex = 0 + hex;sb.append(hex.toUpperCase();return sb.toString();/*将二进制转换成16进制* param buf* return*/public static String parseByte2HexStr(byte buf) StringBuffer sb = new StringBuffer();2.4.2 将16进制转换为二进制/*将16进制转换为二进制* param hexS
10、tr* return*/public static byte parseHexStr2Byte(String hexStr) if (hexStr.length() return null;byte result = new bytehexStr.length()/2;iint high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);resulti = (byte) (high * 16 + low);retu
11、rn result;/*将16进制转换为二进制* param hexStr* return*/public static byte parseHexStr2Byte(String hexStr) if (hexStr.length() return null;然后,我们再修订以上测试代码,如下:String encryptResultStr = parseByte2HexStr(encryptResult);加密后: + encryptResultStr);/解密byte decryptFrom = parseHexStr2Byte(encryptResultStr);byte decrypt
12、Result = decrypt(decryptFrom,password);测试结果如下:test加密后:73C58BAFE578C59366D8C995CD0B9D6D解密后:test2.5 另外一种加密方式还有一种加密方式,大家可以参考如下:/* 加密* param content 需要加密的内容* param password 加密密码* return*/public static byte encrypt2(String content, String password) try SecretKeySpec key = new SecretKeySpec(password.getBytes(), AES/ECB/NoPaddingbyte byteContent = content.getBytes(/* 加密* param content 需要加密的内容* param password 加密密码* return*/public static byte encrypt2(String content, String password) try SecretKeySpec key = new SecretKeySpec(password.getBytes(), catch (UnsupportedEncodingException e) e.print
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