sys/src/cmd/ssh/cipher3des.c

   1 #include "ssh.h"
   2
   3 struct CipherState
   4 {
   5         DESstate enc3des[3];
   6         DESstate dec3des[3];
   7 };
   8
   9 static CipherState*
  10 init3des(Conn *c, int)
  11 {
  12         int i;
  13         CipherState *cs;
  14
  15         cs = emalloc(sizeof(CipherState));
  16         for(i=0; i<3; i++){
  17                 setupDESstate(&cs->enc3des[i], c->sesskey+8*i, nil);
  18                 setupDESstate(&cs->dec3des[i], c->sesskey+8*i, nil);
  19         }
  20         return cs;
  21 }
  22
  23 static void
  24 encrypt3des(CipherState *cs, uchar *buf, int nbuf)
  25 {
  26         desCBCencrypt(buf, nbuf, &cs->enc3des[0]);
  27         desCBCdecrypt(buf, nbuf, &cs->enc3des[1]);
  28         desCBCencrypt(buf, nbuf, &cs->enc3des[2]);
  29 }
  30
  31 static void
  32 decrypt3des(CipherState *cs, uchar *buf, int nbuf)
  33 {
  34         desCBCdecrypt(buf, nbuf, &cs->dec3des[2]);
  35         desCBCencrypt(buf, nbuf, &cs->dec3des[1]);
  36         desCBCdecrypt(buf, nbuf, &cs->dec3des[0]);
  37 }
  38
  39 Cipher cipher3des =
  40 {
  41         SSH_CIPHER_3DES,
  42         "3des",
  43         init3des,
  44         encrypt3des,
  45         decrypt3des,
  46 };
  47