如何使用SHA1CryptoServiceProvider()
文件创建文件的 SHA1 校验和?
问问题
49617 次
4 回答
82
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);
}
}
}
formatted
包含 SHA-1 哈希的字符串表示形式。此外,通过使用 aFileStream
而不是字节缓冲区,ComputeHash
以块的形式计算哈希,因此您不必一次性加载整个文件,这对大文件很有帮助。
于 2010-01-03T03:49:54.543 回答
66
使用 ComputeHash 方法。看这里:
示例片段:
using(var cryptoProvider = new SHA1CryptoServiceProvider())
{
string hash = BitConverter
.ToString(cryptoProvider.ComputeHash(buffer));
//do something with hash
}
其中 buffer 是文件的内容。
于 2010-01-03T03:47:25.193 回答
6
如果您已经将文件作为流读取,则以下技术会在您读取它时计算哈希。唯一需要注意的是,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));
}
}
于 2015-01-23T17:02:49.033 回答
3
您也可以尝试:
FileStream fop = File.OpenRead(@"C:\test.bin");
string chksum = BitConverter.ToString(System.Security.Cryptography.SHA1.Create().ComputeHash(fop));
于 2017-06-26T10:23:20.747 回答