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implement Cipher;
include "sys.m";
include "keyring.m";
kr: Keyring;
DESstate: import kr;
include "sshio.m";
Cipherstate: adt
{
enc: array of ref DESstate;
dec: array of ref DESstate;
};
cs: ref Cipherstate;
id(): int
{
return SSH_CIPHER_3DES;
}
init(key: array of byte, nil: int)
{
kr = load Keyring Keyring->PATH;
cs = ref Cipherstate(array[3] of ref DESstate, array[3] of ref DESstate);
for(i := 0; i < 3; i++){
cs.enc[i] = kr->dessetup(key[i*8:], nil);
cs.dec[i] = kr->dessetup(key[i*8:], nil);
}
}
encrypt(buf: array of byte, nbuf: int)
{
kr->descbc(cs.enc[0], buf, nbuf, Keyring->Encrypt);
kr->descbc(cs.enc[1], buf, nbuf, Keyring->Decrypt);
kr->descbc(cs.enc[2], buf, nbuf, Keyring->Encrypt);
}
decrypt(buf: array of byte, nbuf: int)
{
kr->descbc(cs.dec[2], buf, nbuf, Keyring->Decrypt);
kr->descbc(cs.dec[1], buf, nbuf, Keyring->Encrypt);
kr->descbc(cs.dec[0], buf, nbuf, Keyring->Decrypt);
}
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