/// <summary>
/// 计算文件 Hash 值
/// </summary>
/// <param name="path"></param>
/// <param name="hashAlgorithm"></param>
/// <returns></returns>
public static async Task <string> ComputeFileHashAsync(string path, HashAlgorithm hashAlgorithm)
{
await using var fs = File.OpenRead(path);
var retVal = await hashAlgorithm.ComputeHashAsync(fs);
return(BitConverter.ToString(retVal).Replace("-", string.Empty));
}
private async Task VerifyComputeHashStreamAsync(Stream input, string output)
{
byte[] expected = ByteUtils.HexToByteArray(output);
byte[] actual;
using (HashAlgorithm hash = Create())
{
Assert.True(hash.HashSize > 0);
actual = await hash.ComputeHashAsync(input);
}
Assert.Equal(expected, actual);
}
private async Task <bool> EnsureExistAndHash(string file, string requiredHash, HashAlgorithm sha)
{
if (!File.Exists(file))
{
return(false);
}
if (string.IsNullOrEmpty(requiredHash))
{
return(true);
}
await using var stream = File.OpenRead(file);
var hash = await sha.ComputeHashAsync(stream);
var hashString = BytesToString(hash);
return(hashString.Equals(requiredHash, StringComparison.CurrentCultureIgnoreCase));
}
