对于BouncyCastle类库(包)来说,他提供了很多加密算法,在与.net和java进行相互加解密过程中,得到了不错的应用,本文以DES3为例,来说一下DES3加解密的过程。 加密过程 明文字符转为
对于BouncyCastle类库(包)来说,他提供了很多加密算法,在与.net和java进行相互加解密过程中,得到了不错的应用,本文以DES3为例,来说一下DES3加解密的过程。
加密过程
- 明文字符转为byte数组
- 对密钥进行处理,处理后一般为16或者24字节
- 对明文进行DES3加密,生成密文的byte数组
- 对密文byte数组进行base64的编码
解密过程
- 对密文byte数组进行base64的解码
- 对密钥进行处理,处理后一般为16或者24字节
- 对解码后的byte数组进行DES3解密
- 对解密之后的byte数组进行Encoding.UTF8.GetString方法的调用生成明文字符串
原码
/// <summary> /// DES3加密 /// https://www.go4expert.com/articles/bouncy-castle-net-implementation-triple-t24829/ /// </summary> public class BouncyCastleHelper { static IBlockCipher engine = new DesEngine(); /// <summary> /// 生成一个16位的key. /// </summary> /// <returns></returns> public string GenerateDES3Key() { CipherKeyGenerator cipherKeyGenerator = new CipherKeyGenerator(); cipherKeyGenerator.Init(new KeyGenerationParameters(new SecureRandom(), 192)); //192 specifies the size of key in bits i.e 24 bytes var keyDES3 = cipherKeyGenerator.GenerateKey(); BigInteger bigInteger = new BigInteger(keyDES3); return bigInteger.ToString(16); } /// <summary> /// 做一个16位的md5加密,防止被其它人解析. /// </summary> /// <param name="Source"></param> /// <returns></returns> static byte[] GetMd5Digest(string Source) { var msgBytes = Encoding.UTF8.GetBytes(Source); var md5Digest = new MD5Digest(); md5Digest.BlockUpdate(msgBytes, 0, msgBytes.Length); byte[] result = new byte[md5Digest.GetDigestSize()]; md5Digest.DoFinal(result, 0); return result; } /// <summary> /// 使用DES3加密 /// </summary> /// <param name="plainText">需要加密的字符串</param> /// <param name="keys">加密字符串的密钥</param> /// <returns>加密后的字符串</returns> public static string Encrypt(string plainText, string keys) { byte[] ptBytes = Encoding.UTF8.GetBytes(plainText); byte[] rv = Encrypt(ptBytes, keys); // 密文转为base64字符串 return Convert.ToBase64String(rv); } static byte[] Encrypt(byte[] ptBytes, string keys) { byte[] key = GetMd5Digest(keys); BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new DesEdeEngine()); cipher.Init(true, new KeyParameter(key)); byte[] rv = new byte[cipher.GetOutputSize(ptBytes.Length)]; int tam = cipher.ProcessBytes(ptBytes, 0, ptBytes.Length, rv, 0); cipher.DoFinal(rv, tam); return rv; } /// <summary> /// 使用DES3解密 /// </summary> /// <param name="cipherText">需要加密的字符串</param> /// <param name="keys">加密字符串的密钥</param> /// <returns>解密后的字符串</returns> public static string Decrypt(string cipherText, string keys) { // 把密文进行base64的解码 byte[] base64StringBytes = Convert.FromBase64String(cipherText); var rv = Decrypt(base64StringBytes, keys); // 字符数组转为明文字符串 return Encoding.UTF8.GetString(rv, 0, rv.Length); } static byte[] Decrypt(byte[] cipherText, string keys) { byte[] key = GetMd5Digest(keys); BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new DesEdeEngine()); cipher.Init(false, new KeyParameter(key)); byte[] comparisonBytes = new byte[cipher.GetOutputSize(cipherText.Length)]; int length = cipher.ProcessBytes(cipherText, comparisonBytes, 0); cipher.DoFinal(comparisonBytes, length); //Do the final block return comparisonBytes; } }
调用
string result = BouncyCastleHelper.Encrypt("hello", "abc123"); Console.WriteLine("hello=" + result); Console.WriteLine("plainText=" + BouncyCastleHelper.Decrypt(result, "abc123"));
结果
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