예제 #1
0
        /// <summary>
        ///     对文件内容进行DES解密,能自动识别并处理是否为分段加密
        /// </summary>
        /// <param name="sourceFile">待加密的文件名</param>
        /// <param name="targetFile">保存加密文件名</param>
        /// <param name="key">密钥字符串,长度为8或者24</param>
        public static void DecryptFile(string sourceFile, string targetFile, string key)
        {
            sourceFile.CheckFileExists(nameof(sourceFile));
            targetFile.CheckNotNullOrEmpty(nameof(targetFile));
            key.CheckNotNullOrEmpty(nameof(key));

            var keyBytes = Encoding.UTF8.GetBytes(key);
            var des      = new DesHelper(keyBytes);

            des.DecryptFile(sourceFile, targetFile);
        }
예제 #2
0
        /// <summary>
        ///     分段加密文件
        /// </summary>
        /// <param name="sourceFile">待加密的文件名</param>
        /// <param name="targetFile">保存加密文件名</param>
        /// <param name="sectionLength">分段大小(字节)</param>
        /// <param name="key">密钥字符串,长度为8或者24</param>
        public static void EncryptFile(string sourceFile, string targetFile, int sectionLength, string key)
        {
            sourceFile.CheckFileExists(nameof(sourceFile));
            targetFile.CheckNotNullOrEmpty(nameof(targetFile));
            key.CheckNotNullOrEmpty(nameof(key));
            sectionLength.CheckGreaterThan(nameof(sectionLength), 0);

            var keyBytes = Encoding.UTF8.GetBytes(key);
            var des      = new DesHelper(keyBytes);

            des.EncryptFile(sourceFile, targetFile, sectionLength);
        }
예제 #3
0
        /// <summary>
        ///     加密要发送的数据,包含签名,DES加密,RSA加密DES密钥等步骤
        /// </summary>
        /// <param name="data">要加密的正文明文数据</param>
        /// <returns>已加密待发送的密文</returns>
        public string EncryptData(string data)
        {
            data.CheckNotNull(nameof(data));

            //获取正文摘要
            var signData = RsaHelper.SignData(data, _hashType, _ownPrivateKey);

            data = new[] { data, signData }.ExpandAndToString(Separator);
            //使用DES加密 正文+摘要
            var des = new DesHelper();

            data = des.Encrypt(data);
            //RSA加密DES密钥
            var enDesKey = Convert.ToBase64String(RsaHelper.Encrypt(des.Key, _facePublicKey));

            return(new[] { enDesKey, data }.ExpandAndToString(Separator));
        }
예제 #4
0
        /// <summary>
        ///     解密接收到的加密数据并验证完整性,如果验证通过返回明文
        /// </summary>
        /// <param name="data">接收到的加密数据</param>
        /// <returns>解密并验证成功后,返回明文</returns>
        public string DecryptAndVerifyData(string data)
        {
            data.CheckNotNullOrEmpty(nameof(data));

            string[] separators = { Separator };
            //0为DES密钥密文,1为 正文+摘要 的密文
            var datas = data.Split(separators, StringSplitOptions.None);
            //用接收端私钥RSA解密获取DES密钥
            var desKey = RsaHelper.Decrypt(Convert.FromBase64String(datas[0]), _ownPrivateKey);

            //DES解密获取 正文+摘要 的明文
            data = new DesHelper(desKey).Decrypt(datas[1]);
            //0为正文明文,1为摘要
            datas = data.Split(separators, StringSplitOptions.None);
            data  = datas[0];
            if (RsaHelper.VerifyData(data, datas[1], _hashType, _facePublicKey))
            {
                return(data);
            }
            throw new CryptographicException("加密数据在进行解密时校验失败");
        }
예제 #5
0
        /// <summary>
        ///     解密字节数组
        /// </summary>
        /// <param name="source">要解密的字节数组</param>
        /// <param name="key">密钥字节数组,长度为8或者24</param>
        /// <returns>解密后的字节数组</returns>
        public static byte[] Decrypt(byte[] source, byte[] key)
        {
            var des = new DesHelper(key);

            return(des.Decrypt(source));
        }