c# 计算文件的SHA256值

小渣渣 · 发表于 2016-10-14 10:16:41

static void Main(string[] args)
{
Console.WriteLine(SHA256File(@"C:\BaiduYunDownload\66666.jpg"));
}
/// 计算文件的 SHA256 值
/// </summary>
/// <param name="fileName">要计算 SHA256 值的文件名和路径</param>
/// <returns>SHA256值16进制字符串</returns>
public static string SHA256File(string fileName)
{
return HashFile(fileName, "sha256");
}
/// <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>
public static string HashFile(string fileName, string algName)
{
if (!System.IO.File.Exists(fileName))
return string.Empty;
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
byte[] hashBytes = HashData(fs, algName);
fs.Close();
return ByteArrayToHexString(hashBytes);
}
/// <summary>
/// 字节数组转换为16进制表示的字符串
/// </summary>
public static string ByteArrayToHexString(byte[] buf)
{
string returnStr = "";
if (buf != null)
{
for (int i = 0; i < buf.Length; i++)
{
returnStr += buf[i].ToString("X2");
}
}
return returnStr;
}
/// <summary>
/// 计算哈希值
/// </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>
public static byte[] HashData(Stream stream, string algName)
{
HashAlgorithm algorithm;
if (algName == null)
{
throw new ArgumentNullException("algName 不能为 null");
}
if (string.Compare(algName, "sha256", true) == 0)
{
algorithm = SHA256.Create();
}
else
{
if (string.Compare(algName, "md5", true) != 0)
{
throw new Exception("algName 只能使用 sha256 或 md5");
}
algorithm = MD5.Create();
}
return algorithm.ComputeHash(stream);
}

复制代码

小渣渣 · 发表于 2016-10-14 10:19:34

简化了一下：

static void Main(string[] args)
{
Console.WriteLine(SHA256File(@"C:\BaiduYunDownload\66666.jpg"));
}
/// 计算文件的 SHA256 值
/// </summary>
/// <param name="fileName">要计算 SHA256 值的文件名和路径</param>
/// <returns>SHA256值16进制字符串</returns>
public static string SHA256File(string fileName)
{
return HashFile(fileName);
}
/// <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>
public static string HashFile(string fileName)
{
if (!System.IO.File.Exists(fileName))
return string.Empty;
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
byte[] hashBytes = HashData(fs);
fs.Close();
return ByteArrayToHexString(hashBytes);
}
/// <summary>
/// 字节数组转换为16进制表示的字符串
/// </summary>
private static string ByteArrayToHexString(byte[] buf)
{
string returnStr = string.Empty;
if (buf != null)
{
for (int i = 0; i < buf.Length; i++)
{
returnStr += buf[i].ToString("X2");
}
}
return returnStr;
}
/// <summary>
/// 计算哈希值
/// </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 static byte[] HashData(Stream stream)
{
HashAlgorithm algorithm = SHA256.Create();
return algorithm.ComputeHash(stream);
}

复制代码

小渣渣 · 发表于 2022-12-11 14:06:39

C# 获取文件MD5、SHA1的值
https://www.itsvse.com/thread-2962-1-1.html

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