/// <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("sourceFile"); targetFile.CheckNotNullOrEmpty("targetFile"); key.CheckNotNullOrEmpty("key"); sectionLength.CheckGreaterThan("sectionLength", 0); byte[] keyBytes = Encoding.UTF8.GetBytes(key); DesHelper des = new DesHelper(keyBytes); des.EncryptFile(sourceFile, targetFile, sectionLength); }
/// <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("data"); //获取正文摘要 string signData = RsaHelper.SignData(data, _hashType, _ownPrivateKey); data = new[] { data, signData }.ExpandAndToString(Separator); //使用DES加密 正文+摘要 DesHelper des = new DesHelper(); data = des.Encrypt(data); //RSA加密DES密钥 string enDesKey = Convert.ToBase64String(RsaHelper.Encrypt(des.Key, _facePublicKey)); return(new[] { enDesKey, data }.ExpandAndToString(Separator)); }
/// <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("data"); string[] separators = { Separator }; //0为DES密钥密文,1为 正文+摘要 的密文 string[] datas = data.Split(separators, StringSplitOptions.None); //用接收端私钥RSA解密获取DES密钥 byte[] 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"); }
/// <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("data"); string[] separators = { Separator }; //0为DES密钥密文,1为 正文+摘要 的密文 string[] datas = data.Split(separators, StringSplitOptions.None); //用接收端私钥RSA解密获取DES密钥 byte[] 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"); }
/// <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) { DesHelper des = new DesHelper(key); return(des.Decrypt(source)); }
/// <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("data"); //获取正文摘要 string signData = RsaHelper.SignData(data, _hashType, _ownPrivateKey); data = new[] { data, signData }.ExpandAndToString(Separator); //使用DES加密 正文+摘要 DesHelper des = new DesHelper(); data = des.Encrypt(data); //RSA加密DES密钥 string enDesKey = Convert.ToBase64String(RsaHelper.Encrypt(des.Key, _facePublicKey)); return new[] { enDesKey, data }.ExpandAndToString(Separator); }
/// <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("sourceFile"); targetFile.CheckNotNullOrEmpty("targetFile"); key.CheckNotNullOrEmpty("key"); byte[] keyBytes = Encoding.UTF8.GetBytes(key); DesHelper des = new DesHelper(keyBytes); des.DecryptFile(sourceFile, targetFile); }
/// <summary> /// 解密字符串,输入BASE64编码字符串 /// </summary> /// <param name="source">要解密的BASE64编码字符串</param> /// <param name="key">密钥字符串,长度为8或者24</param> /// <returns>解密的明文字符串</returns> public static string Decrypt(string source, string key) { source.CheckNotNullOrEmpty("source"); key.CheckNotNullOrEmpty("key"); byte[] keyBytes = Encoding.UTF8.GetBytes(key); DesHelper des = new DesHelper(keyBytes); return des.Decrypt(source); }
/// <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) { DesHelper des = new DesHelper(key); return des.Decrypt(source); }