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using System;
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using System.Security.Cryptography;
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using System.Text;
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namespace NzbDrone.Common
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{
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public static class HashUtil
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{
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public static string CalculateCrc(string input)
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{
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var mCrc = 0xffffffff;
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var bytes = Encoding.UTF8.GetBytes(input);
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foreach (var myByte in bytes)
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{
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mCrc ^= (uint)myByte << 24;
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for (var i = 0; i < 8; i++)
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{
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if ((Convert.ToUInt32(mCrc) & 0x80000000) == 0x80000000)
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{
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mCrc = (mCrc << 1) ^ 0x04C11DB7;
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}
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else
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{
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mCrc <<= 1;
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}
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}
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}
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return $"{mCrc:x8}";
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}
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public static string ComputeSha256Hash(string rawData)
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{
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using var sha256Hash = SHA256.Create();
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var hashBytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));
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return Convert.ToHexString(hashBytes);
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}
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public static string CalculateMd5(string s)
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{
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// Use input string to calculate MD5 hash
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using (var md5 = MD5.Create())
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{
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var inputBytes = Encoding.ASCII.GetBytes(s);
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var hashBytes = md5.ComputeHash(inputBytes);
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return Convert.ToHexString(hashBytes);
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}
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}
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public static string AnonymousToken()
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{
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var seed = $"{Environment.ProcessorCount}_{Environment.OSVersion.Platform}_{Environment.MachineName}_{Environment.UserName}";
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return HashUtil.CalculateCrc(seed);
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}
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}
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}
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