public string GenerateSecret()
{
var buffer = new byte[9];
using var rng = RNGCryptoServiceProvider.Create();
rng.GetBytes(buffer);
var secret = Convert.ToBase64String(buffer).Substring(0, 10).Replace('/', '0').Replace('+', '1');
var encoded = new Base32Codec().Encode(Encoding.ASCII.GetBytes(secret));
return(encoded);
}
public void EncodeTest()
{
var tests = new[] {
new { encoded = "", decoded = "", },
new { encoded = "MY======", decoded = "f", },
new { encoded = "MZXQ====", decoded = "fo", },
new { encoded = "MZXW6===", decoded = "foo", },
new { encoded = "MZXW6YQ=", decoded = "foob", },
new { encoded = "MZXW6YTB", decoded = "fooba", },
new { encoded = "MZXW6YTBOI======", decoded = "foobar", },
};
var encoding = new Base32Codec();
foreach (var test in tests)
{
var buffer = Encoding.ASCII.GetBytes(test.decoded);
var encoded = encoding.Encode(buffer);
Assert.AreEqual(test.encoded, encoded);
}
}
public void DecodeTest()
{
var tests = new[] {
new { encoded = "", decoded = "", },
new { encoded = "MY======", decoded = "f", },
new { encoded = "MZXQ====", decoded = "fo", },
new { encoded = "MZXW6===", decoded = "foo", },
new { encoded = "MZXW6YQ=", decoded = "foob", },
new { encoded = "MZXW6YTB", decoded = "fooba", },
new { encoded = "MZXW6YTBOI======", decoded = "foobar", },
};
var encoding = new Base32Codec();
foreach (var test in tests)
{
var bytes = encoding.Decode(test.encoded);
var decoded = Encoding.ASCII.GetString(bytes);
Assert.AreEqual(test.decoded, decoded);
}
}
public byte[] GetKey(string secret)
{
var decoded = new Base32Codec().Decode(secret);
return(decoded);
}
