/// <summary>
/// 计算哈希值(默认SHA1)
/// </summary>
/// <param name="stream">要计算哈希值的 Stream</param>
/// <param name="algName">算法:sha1,md5</param>
/// <returns>哈希值字节数组</returns>
private byte[] HashData(System.IO.Stream stream, AlgNameEnum algNameEnum)
{
System.Security.Cryptography.HashAlgorithm algorithm;
switch (algNameEnum)
{
case AlgNameEnum.MD5:
algorithm = System.Security.Cryptography.MD5.Create();
break;
case AlgNameEnum.SHA1:
algorithm = System.Security.Cryptography.SHA1.Create();
break;
case AlgNameEnum.SHA256:
algorithm = System.Security.Cryptography.SHA256.Create();
break;
case AlgNameEnum.SHA384:
algorithm = System.Security.Cryptography.SHA384.Create();
break;
case AlgNameEnum.SHA512:
algorithm = System.Security.Cryptography.SHA512.Create();
break;
default:
algorithm = System.Security.Cryptography.SHA1.Create();
break;
}
return(algorithm.ComputeHash(stream));
}
/// <summary>
/// 计算文件的哈希值
/// </summary>
/// <param name="fileName">要计算哈希值的文件名和路径</param>
/// <param name="algName">算法:sha1,md5</param>
/// <returns>哈希值16进制字符串</returns>
private string HashFile(string fileName, AlgNameEnum algNameEnum)
{
if (!System.IO.File.Exists(fileName))
{
return(string.Empty);
}
System.IO.FileStream fs = new System.IO.FileStream(fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
byte[] hashBytes = HashData(fs, algNameEnum);
fs.Close();
return(ByteArrayToHexString(hashBytes));
}
