/// <summary>
/// 解密文件
/// </summary>
/// <param name="filePath"></param>
/// <param name="targetFilePath"></param>
/// <param name="header"></param>
/// <param name="token"></param>
public static byte[] DecodeFile(string filePath, string targetFilePath, string header, string token)
{
byte[] sourceData;
byte[] decodedData;
//读取原始数据
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
sourceData = new byte[fs.Length];
fs.Read(sourceData, 0, (int)fs.Length);
fs.Dispose();
//移除头信息
int headerStrLength = header.Length;
byte[] tempData = new byte[sourceData.Length - headerStrLength];
for (var i = 0; i < tempData.Length; i++)
{
tempData[i] = sourceData[i + headerStrLength];
}
//解码
decodedData = AesCryptoImpl.Decrypt(tempData, token);
if (!string.IsNullOrEmpty(targetFilePath))
{
//保存文件
fs = new FileStream(targetFilePath, FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(decodedData, 0, decodedData.Length);
fs.Flush();
fs.Dispose();
}
return(decodedData);
}
/// <summary>
/// 加密并保存
/// </summary>
/// <param name="filePath"></param>
/// <param name="targetFilePath"></param>
/// <param name="header"></param>
/// <param name="token"></param>
public static byte[] EncodeFile(string filePath, string targetFilePath, string header, string token)
{
byte[] sourceData;
byte[] encodedData;
//读取原始数据
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
sourceData = new byte[fs.Length];
fs.Read(sourceData, 0, (int)fs.Length);
fs.Dispose();
int headerStrLength = header.Length;
byte[] headerBytes = Encoding.Default.GetBytes(header);
byte[] tempData = AesCryptoImpl.Encrypt(sourceData, token);
encodedData = new byte[tempData.Length + headerStrLength];
//添加头信息
for (var i = 0; i < headerStrLength; i++)
{
encodedData[i] = headerBytes[i];
}
for (int i = 0; i < tempData.Length; i++)
{
encodedData[headerStrLength + i] = tempData[i];
}
if (!string.IsNullOrEmpty(targetFilePath))
{
fs = new FileStream(targetFilePath, FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(encodedData, 0, encodedData.Length);
fs.Flush();
fs.Dispose();
}
return(encodedData);
}
