sys/src/cmd/ssh/cipherrc4.c

   1 #include "ssh.h"
   2
   3 struct CipherState
   4 {
   5         RC4state enc;
   6         RC4state dec;
   7 };
   8
   9 static CipherState*
  10 initrc4(Conn *c, int isserver)
  11 {
  12         CipherState *cs;
  13
  14         cs = emalloc(sizeof(CipherState));
  15         if(isserver){
  16                 setupRC4state(&cs->enc, c->sesskey, 16);
  17                 setupRC4state(&cs->dec, c->sesskey+16, 16);
  18         }else{
  19                 setupRC4state(&cs->dec, c->sesskey, 16);
  20                 setupRC4state(&cs->enc, c->sesskey+16, 16);
  21         }
  22         return cs;
  23 }
  24
  25 static void
  26 encryptrc4(CipherState *cs, uchar *buf, int nbuf)
  27 {
  28         rc4(&cs->enc, buf, nbuf);
  29 }
  30
  31 static void
  32 decryptrc4(CipherState *cs, uchar *buf, int nbuf)
  33 {
  34         rc4(&cs->dec, buf, nbuf);
  35 }
  36
  37 Cipher cipherrc4 =
  38 {
  39         SSH_CIPHER_RC4,
  40         "rc4",
  41         initrc4,
  42         encryptrc4,
  43         decryptrc4,
  44 };
  45