internal byte[] genKey(byte[] passphrase, byte[] iv)
{
if (cipher == null)
{
cipher = genCipher();
}
if (hash == null)
{
hash = genHash();
}
byte[] key = new byte[cipher.getBlockSize()];
int hsize = hash.getBlockSize();
byte[] hn = new byte[key.Length / hsize * hsize +
(key.Length % hsize == 0 ? 0 : hsize)];
try {
byte[] tmp = null;
if (vendor == VENDOR_OPENSSH)
{
for (int index = 0; index + hsize <= hn.Length;)
{
if (tmp != null)
{
hash.update(tmp, 0, tmp.Length);
}
hash.update(passphrase, 0, passphrase.Length);
hash.update(iv, 0, iv.Length);
tmp = hash.digest();
Array.Copy(tmp, 0, hn, index, tmp.Length);
index += tmp.Length;
}
Array.Copy(hn, 0, key, 0, key.Length);
}
else if (vendor == VENDOR_FSECURE)
{
for (int index = 0; index + hsize <= hn.Length;)
{
if (tmp != null)
{
hash.update(tmp, 0, tmp.Length);
}
hash.update(passphrase, 0, passphrase.Length);
tmp = hash.digest();
Array.Copy(tmp, 0, hn, index, tmp.Length);
index += tmp.Length;
}
Array.Copy(hn, 0, key, 0, key.Length);
}
}
catch (Exception e) {
Console.WriteLine(e);
}
return(key);
}
public bool setPassphrase(String _passphrase)
{
/*
* hash is MD5
* h(0) <- hash(passphrase, iv);
* h(n) <- hash(h(n-1), passphrase, iv);
* key <- (h(0),...,h(n))[0,..,key.Length];
*/
try {
if (encrypted)
{
if (_passphrase == null)
{
return(false);
}
byte[] passphrase = System.Text.Encoding.Default.GetBytes(_passphrase);
int hsize = hash.getBlockSize();
byte[] hn = new byte[key.Length / hsize * hsize +
(key.Length % hsize == 0 ? 0 : hsize)];
byte[] tmp = null;
if (keytype == OPENSSH)
{
for (int index = 0; index + hsize <= hn.Length;)
{
if (tmp != null)
{
hash.update(tmp, 0, tmp.Length);
}
hash.update(passphrase, 0, passphrase.Length);
hash.update(iv, 0, iv.Length);
tmp = hash.digest();
Array.Copy(tmp, 0, hn, index, tmp.Length);
index += tmp.Length;
}
Array.Copy(hn, 0, key, 0, key.Length);
}
else if (keytype == FSECURE)
{
for (int index = 0; index + hsize <= hn.Length;)
{
if (tmp != null)
{
hash.update(tmp, 0, tmp.Length);
}
hash.update(passphrase, 0, passphrase.Length);
tmp = hash.digest();
Array.Copy(tmp, 0, hn, index, tmp.Length);
index += tmp.Length;
}
Array.Copy(hn, 0, key, 0, key.Length);
}
}
if (decrypt())
{
encrypted = false;
return(true);
}
P_array = Q_array = G_array = pub_array = prv_array = null;
return(false);
}
catch (Exception e) {
if (e is SshClientException)
{
throw (SshClientException)e;
}
throw new SshClientException(e.ToString());
}
}