获取文件的MD5值
public static string GetFileHash(string filePath, HashType type)
{
if (!File.Exists(filePath))
return string.Empty;
System.Security.Cryptography.HashAlgorithm hasher;
switch(type)
{
case HashType.SHA1:
default:
hasher = new SHA1CryptoServiceProvider();
break;
case HashType.SHA256:
hasher = new SHA256Managed();
break;
case HashType.SHA384:
hasher = new SHA384Managed();
break;
case HashType.SHA512:
hasher = new SHA512Managed();
break;
case HashType.MD5:
hasher = new MD5CryptoServiceProvider();
break;
case HashType.RIPEMD160:
hasher = new RIPEMD160Managed();
break;
}
StringBuilder buff = new StringBuilder();
try
{
using (FileStream f = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 8192))
{
hasher.ComputeHash(f);
Byte[] hash = hasher.Hash;
foreach (Byte hashByte in hash)
{
buff.Append(string.Format("{0:x2}", hashByte));
}
}
}
catch
{
return "Error reading file." + new System.Random(DateTime.Now.Second * DateTime.Now.Millisecond).Next().ToString();
}
return buff.ToString();
}
public enum HashType
{
[Description("SHA-1")]
SHA1,
[Description("SHA-256")]
SHA256,
[Description("SHA-384")]
SHA384,
[Description("SHA-512")]
SHA512,
[Description("MD5")]
MD5,
[Description("RIPEMD-160")]
RIPEMD160
}