/// <summary>
/// Read a keyblob of the given type from the buffer, and return it as
/// a key. Only RSA and DSA keys are supported.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public Key ReadKeyBlob(string type)
{
switch (type)
{
case "ssh-dss":
var dsakey = new DsaKey();
dsakey.P = ReadBigNum();
dsakey.Q = ReadBigNum();
dsakey.G = ReadBigNum();
dsakey.X = ReadBigNum(); //pub
return dsakey;
case "ssh-rsa":
var rsakey = new RsaKey();
rsakey.Exponent = ReadBigNum();
rsakey.Modulus = ReadBigNum();
return rsakey;
default:
throw new NotSupportedException(string.Format("unsupported key type `{0}'", type));
}
}
public void WriteDssKeyShouldWriteArgumentToEndOfBuffer()
{
var buffer = new Buffer("start");
var key = new DsaKey();
key.P = new BigInteger(new byte[] {0x0, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99, 0x88});
key.Q = new BigInteger(new byte[] {0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00});
key.G = new BigInteger(new byte[] {0, 0xff, 0xdd, 0xbb, 0x99, 0x77, 0x55, 0x33, 0x11});
key.X = new BigInteger(new byte[] {0xee, 0xcc, 0xaa, 0x88, 0x66, 0x44, 0x22, 0x00});
buffer.WriteKey(key);
Assert.AreEqual(
"start\0\0\0\x7ssh-dss\0\0\0\x8\xff\xee\xdd\xcc\xbb\xaa\x99\x88\0\0\0\x8\x77\x66\x55\x44\x33\x22\x11\x00\0\0\0\x8\xff\xdd\xbb\x99\x77\x55\x33\x11\0\0\0\x8\xee\xcc\xaa\x88\x66\x44\x22\x00",
buffer.ToString());
}