public override void PerformTest()
{
IDigest d = new Sha1Digest();
ShortenedDigest sd = new ShortenedDigest(new Sha1Digest(), 10);
if (sd.GetDigestSize() != 10)
{
Fail("size check wrong for SHA-1");
}
if (sd.GetByteLength() != d.GetByteLength())
{
Fail("byte length check wrong for SHA-1");
}
//
// check output fits
//
sd.DoFinal(new byte[10], 0);
d = new Sha512Digest();
sd = new ShortenedDigest(new Sha512Digest(), 20);
if (sd.GetDigestSize() != 20)
{
Fail("size check wrong for SHA-512");
}
if (sd.GetByteLength() != d.GetByteLength())
{
Fail("byte length check wrong for SHA-512");
}
//
// check output fits
//
sd.DoFinal(new byte[20], 0);
try
{
new ShortenedDigest(null, 20);
Fail("null parameter not caught");
}
catch (ArgumentException)
{
// expected
}
try
{
new ShortenedDigest(new Sha1Digest(), 50);
Fail("short digest not caught");
}
catch (ArgumentException)
{
// expected
}
}
// signature
public static string CreateSignature(string email, string password, RsaKeyParameters key)
{
byte[] prefix = { 0x00 };
var keyStruct = KeyToStruct(key);
var toEncrypt = Encoding.UTF8.GetBytes(email + "\x00" + password);
var cipher = new OaepEncoding(new RsaEngine(), new Sha1Digest(), null);
cipher.Init(true, key);
var encrypted = cipher.ProcessBlock(toEncrypt, 0, toEncrypt.Length);
var digest = new Sha1Digest();
var hash = new byte[digest.GetByteLength()];
digest.BlockUpdate(keyStruct, 0, keyStruct.Length);
digest.DoFinal(hash, 0);
var hashExcerpt = hash.Take(4).ToArray();
return DataTypeUtils.UrlSafeBase64(DataTypeUtils.CombineBytes(prefix, hashExcerpt, encrypted));
}