/// <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>
/// 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);
}
/// <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>
/// 整体加密文件
/// </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="key">密钥字符串，长度为8或者24</param>
public static void EncryptFile(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.EncryptFile(sourceFile, targetFile);
}