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implement Cipher;
include "sys.m";
include "ipints.m";
ipints: IPints;
IPint: import ipints;
include "crypt.m";
crypt: Crypt;
DESstate: import crypt;
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)
{
ipints = load IPints IPints->PATH;
crypt = load Crypt Crypt->PATH;
cs = ref Cipherstate(array[3] of ref DESstate, array[3] of ref DESstate);
for(i := 0; i < 3; i++){
cs.enc[i] = crypt->dessetup(key[i*8:], nil);
cs.dec[i] = crypt->dessetup(key[i*8:], nil);
}
}
encrypt(buf: array of byte, nbuf: int)
{
crypt->descbc(cs.enc[0], buf, nbuf, Crypt->Encrypt);
crypt->descbc(cs.enc[1], buf, nbuf, Crypt->Decrypt);
crypt->descbc(cs.enc[2], buf, nbuf, Crypt->Encrypt);
}
decrypt(buf: array of byte, nbuf: int)
{
crypt->descbc(cs.dec[2], buf, nbuf, Crypt->Decrypt);
crypt->descbc(cs.dec[1], buf, nbuf, Crypt->Encrypt);
crypt->descbc(cs.dec[0], buf, nbuf, Crypt->Decrypt);
}
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