如何在 C# 中执行 SHA1 文件校验和？
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How do I do a SHA1 File Checksum in C#?
提问by Firesteel
How do I use the SHA1CryptoServiceProvider()on a file to create a SHA1 Checksum of the file?
如何使用SHA1CryptoServiceProvider()文件上的 来创建文件的 SHA1 校验和？
回答by dreadwail
With the ComputeHash method. See here:
使用 ComputeHash 方法。看这里：
Example snippet:
示例片段：
using(var cryptoProvider = new SHA1CryptoServiceProvider())
{
string hash = BitConverter
.ToString(cryptoProvider.ComputeHash(buffer));
//do something with hash
}
Where buffer is the contents of your file.
其中 buffer 是文件的内容。
回答by dreadwail
using (FileStream fs = new FileStream(@"C:\file\location", FileMode.Open))
using (BufferedStream bs = new BufferedStream(fs))
{
using (SHA1Managed sha1 = new SHA1Managed())
{
byte[] hash = sha1.ComputeHash(bs);
StringBuilder formatted = new StringBuilder(2 * hash.Length);
foreach (byte b in hash)
{
formatted.AppendFormat("{0:X2}", b);
}
}
}
formattedcontains the string representation of the SHA-1 hash. Also, by using a FileStreaminstead of a byte buffer, ComputeHashcomputes the hash in chunks, so you don't have to load the entire file in one go, which is helpful for large files.
formatted包含 SHA-1 哈希的字符串表示。此外，通过使用 aFileStream而不是字节缓冲区，ComputeHash以块为单位计算散列，因此您不必一次性加载整个文件，这对大文件很有帮助。
回答by Daniel James Bryars
If you are already reading the file as a stream, then the following technique calculates the hash as you read it. The only caveat is that you need to consume the whole stream.
如果您已经将文件作为流读取，则以下技术会在您读取文件时计算散列。唯一的警告是您需要消耗整个流。
class Program
{
static void Main(string[] args)
{
String sourceFileName = "C:\test.txt";
Byte[] shaHash;
//Use Sha1Managed if you really want sha1
using (var shaForStream = new SHA256Managed())
using (Stream sourceFileStream = File.Open(sourceFileName, FileMode.Open))
using (Stream sourceStream = new CryptoStream(sourceFileStream, shaForStream, CryptoStreamMode.Read))
{
//Do something with the sourceStream
//NOTE You need to read all the bytes, otherwise you'll get an exception ({"Hash must be finalized before the hash value is retrieved."})
while(sourceStream.ReadByte() != -1);
shaHash = shaForStream.Hash;
}
Console.WriteLine(Convert.ToBase64String(shaHash));
}
}
回答by SNMetamorph
Also you can try:
您也可以尝试：
FileStream fop = File.OpenRead(@"C:\test.bin");
string chksum = BitConverter.ToString(System.Security.Cryptography.SHA1.Create().ComputeHash(fop));
