// Pops out random know answer tests from the list, max number is 1000
public KnownAnswerTests RandomKATsSubset(KnownAnswerTests kats, uint subsetLength = 200)
{
if (subsetLength >= 2000)
{
throw new ArgumentOutOfRangeException("Maximum number of KATs available is 2000");
}
subsetLength = 2000 - subsetLength;
Random rnd = new Random();
for (int i = 0; i < subsetLength; i++)
{
kats.ModSHA256.RemoveAt(rnd.Next(kats.ModSHA256.Count));
kats.ModSHA512.RemoveAt(rnd.Next(kats.ModSHA512.Count));
}
return(kats);
}
public static KnownAnswerTests ParseKATFile()
{
try
{
if (!File.Exists(katpath))
{
using (WebClient client = new WebClient())
{
client.DownloadFile(katurl, "kat.txt");
}
}
string[] lines = File.ReadAllLines(katpath);
KnownAnswerTests KATs = new KnownAnswerTests();
// Initialise regexes
Regex kdf256regex = new Regex("KDF/SHA-256");
Regex kdf512regex = new Regex("KDF/SHA-512");
Regex modSHA256initregex = new Regex("2048-bit modulus, SHA-256");
Regex modSHA512initregex = new Regex("2048-bit modulus, SHA-512");
Regex modSHA256regex = new Regex(@"2048-bit modulus, SHA-256 input: ([a-f0-9]*)" +
" salt: ([a-f0-9]*) pre-hashing: (.*) post-hashing: (.*) bin384: ([a-f0-9]*)" +
" bin4096: ([a-f0-9]*) str384: ([A-Za-z0-9+/_]*) str4096: ([A-Za-z0-9+/_]*)");
Regex modSHA512regex = new Regex(@"2048-bit modulus, SHA-512 input: ([a-f0-9]*)" +
" salt: ([a-f0-9]*) pre-hashing: (.*) post-hashing: (.*) bin384: ([a-f0-9]*)" +
" bin4096: ([a-f0-9]*) str384: ([A-Za-z0-9+/_]*) str4096: ([A-Za-z0-9+/_]*)");
// Parse lines, seperate KATs into appropriate lists of dictionaries
for (int i = 0; i < lines.Length; i++)
{
string line = lines[i];
// Check KAT type
if (kdf256regex.Match(line).Success)
{
var dict = new Dictionary <string, string>
{
{ "input", lines[i + 1].Replace("input: ", string.Empty) },
{ "output", lines[i + 2].Replace("output: ", string.Empty) }
};
KATs.KDF256.Add(dict);
}
else if (kdf512regex.Match(line).Success)
{
var dict = new Dictionary <string, string>
{
{ "input", lines[i + 1].Replace("input: ", string.Empty) },
{ "output", lines[i + 2].Replace("output: ", string.Empty) }
};
KATs.KDF512.Add(dict);
}
else if (modSHA256initregex.Match(line).Success)
{
// Concatenate variables and extract regex captures
String concat = String.Join(" ", lines.Skip(i).Take(9));
Match ModSHA256Match = modSHA256regex.Match(concat);
if (ModSHA256Match.Success)
{
var dict = new Dictionary <string, string>();
dict.Add("hashfunction", "SHA256");
dict.Add("input", ModSHA256Match.Groups[1].ToString());
dict.Add("salt", ModSHA256Match.Groups[2].ToString());
dict.Add("pre-hashing", ModSHA256Match.Groups[3].ToString());
dict.Add("post-hashing", ModSHA256Match.Groups[4].ToString());
dict.Add("bin384", ModSHA256Match.Groups[5].ToString());
dict.Add("bin4096", ModSHA256Match.Groups[6].ToString());
dict.Add("str384", ModSHA256Match.Groups[7].ToString());
dict.Add("str4096", ModSHA256Match.Groups[8].ToString());
KATs.ModSHA256.Add(dict);
}
}
else if (modSHA512initregex.Match(line).Success)
{
String concat = String.Join(" ", lines.Skip(i).Take(9));
Match ModSHA512Match = modSHA512regex.Match(concat);
if (ModSHA512Match.Success)
{
var dict = new Dictionary <string, string>();
dict.Add("hashfunction", "SHA512");
dict.Add("input", ModSHA512Match.Groups[1].ToString());
dict.Add("salt", ModSHA512Match.Groups[2].ToString());
dict.Add("pre-hashing", ModSHA512Match.Groups[3].ToString());
dict.Add("post-hashing", ModSHA512Match.Groups[4].ToString());
dict.Add("bin384", ModSHA512Match.Groups[5].ToString());
dict.Add("bin4096", ModSHA512Match.Groups[6].ToString());
dict.Add("str384", ModSHA512Match.Groups[7].ToString());
dict.Add("str4096", ModSHA512Match.Groups[8].ToString());
KATs.ModSHA512.Add(dict);
}
}
//string[] katKeys = { "input", "salt", "pre-hashing", "post-hashing", "bin384", "bin4096", "str384", "str4096" };
//var dict = new Dictionary<string, string>{{ "hashfunction", "SHA512" } };
//for (int j = 0; i < 8; i++ )
//{
// dict.Add(katKeys[j], ModSHA512Match.Groups[j+1].ToString()); )
//}
}
return(KATs);
}
catch (FileNotFoundException)
{
throw new FileNotFoundException("No KAT file and unable to download," +
" kat.txt can be found here:" +
" https://github.com/bsdphk/PHC/blob/master/Makwa/kat.txt. " +
"Place in KnownAnswerTests folder");
}
}