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PluginExtensions.cs
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PluginExtensions.cs
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using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
namespace Metacrack
{
public static class PluginExtensions
{
public static (string Hash, string Plain, int Length) ReadLineAsHashPlain(this StreamReader reader, bool ignoreSalt = false)
{
var line = reader.ReadLine();
var splits = line.Split(':');
var splitsLength = splits.Length;
if (splitsLength < 2) return (null, null, 0);
var fullHash = splits[0];
//Throw away any hash identifier eg MD5 ABCXXX
if (fullHash.Contains(' ')) fullHash = fullHash.Split(' ')[1];
//Salts can have the : character.
//So we have to take the first split and the last split as the hash and password and use everything in between
if (splitsLength > 2)
{
var i = 1;
var builder = new StringBuilder(fullHash);
while (i < splitsLength - 1)
{
builder.Append(':');
builder.Append(splits[i]);
i++;
}
if (!ignoreSalt) fullHash = builder.ToString();
return (fullHash, splits[splitsLength - 1], line.Length);
}
else
{
return (fullHash, splits[1], line.Length);
}
}
public static (string Email, string FullHash, string Text, string HashPart, string Salt, int SplitLength) ReadLineAsEmailHash(this StreamReader reader, bool noSalt = false, bool base64 = false)
{
var line = reader.ReadLine();
var splits = line.Split(':');
var splitsLength = splits.Length;
if (splitsLength < 2) return (null, null, line, null, null, 0);
var email = splits[0];
var fullHash = splits[1];
var hashPart = splits[1];
var salt = default(String);
//Append the rest of the splits as the salt, adding back the : that was lost
if (splits.Length > 2 && !noSalt)
{
var builder = new StringBuilder(fullHash);
var saltBuilder = new StringBuilder();
var i = 2;
while (i < splitsLength)
{
builder.Append(':');
builder.Append(splits[i]);
if (i>2) saltBuilder.Append(':');
saltBuilder.Append(splits[i]);
i++;
}
fullHash = builder.ToString();
salt = saltBuilder.ToString();
}
//Check hash for base64 encoding
if (base64)
{
if (fullHash.EndsWith("="))
{
var bytes = Convert.FromBase64String(fullHash);
fullHash = BitConverter.ToString(bytes).Replace("-", "").ToLower();
}
}
return (email, fullHash, line, hashPart, salt, splitsLength);
}
public static (string FullHash, string Text, string HashPart, string Salt, int SplitLength) ReadLineAsHash(this StreamReader reader, bool noSalt = false, bool base64 = false)
{
var line = reader.ReadLine();
var splits = line.Split(':');
var splitsLength = splits.Length;
var fullHash = splits[0];
var hashPart = splits[0];
var salt = default(String);
//Append the rest of the splits as the salt, adding back the : that was lost
if (splits.Length > 1 && !noSalt)
{
var builder = new StringBuilder(fullHash);
var saltBuilder = new StringBuilder();
var i = 1;
while (i < splitsLength)
{
builder.Append(':');
builder.Append(splits[i]);
if (i > 1) saltBuilder.Append(':');
saltBuilder.Append(splits[i]);
i++;
}
fullHash = builder.ToString();
salt = saltBuilder.ToString();
}
//Check hash for base64 encoding
if (base64)
{
if (fullHash.EndsWith("="))
{
var bytes = Convert.FromBase64String(fullHash);
fullHash = BitConverter.ToString(bytes).Replace("-", "").ToLower();
}
}
return (fullHash, line, hashPart, salt, splitsLength);
}
public static void RemoveLowest(this Dictionary<string, int> value)
{
var low = int.MaxValue;
foreach (var de in value)
{
if (de.Value < low) low = de.Value;
}
//Now loop through again and remove all keys that have a low value
var keys = new List<string>();
foreach (var de in value)
{
if (de.Value == low) keys.Add(de.Key);
}
//Finally remove
foreach (var key in keys) value.Remove(key);
}
public static async Task<List<string>> ReadLinesAsync(this StreamReader reader, int count)
{
var result = new List<string>();
var i = 1;
while (!reader.EndOfStream && i < count)
{
result.Add(reader.ReadLine());
i++;
}
//Perform the last read asyncronously to yield some control
if (!reader.EndOfStream) result.Add(await reader.ReadLineAsync());
return result;
}
public static string ReplaceFirst(this string text, string search, string replace)
{
int pos = text.IndexOf(search);
if (pos < 0) return text;
return text.Substring(0, pos) + replace + text.Substring(pos + search.Length);
}
}
}