where the tweak routine point to?

where the tweak routine point to?

[Bai Shuwei]

Hi, All:
  When i use the cryptsetup command to set the aes-xts-plain
encryption, the system will entry the crypt() routine which defined in
the xts.c file. I find the routine will call two important routines:
tw and fn. I think the fn will point to the aes_encrypt/decrypt
routine. But i want to know which routine the tw will point to for
aes-xts-plain encryption? and where i can find its source code? I put
the segment where the tw routine will be called in the bellow.

       wsrc = w->src.virt.addr;
       wdst = w->dst.virt.addr;

       /* calculate first value of T */
       tw(crypto_cipher_tfm(ctx->tweak), w->iv, w->iv);

       goto first;

       for (;;) {
               do {


Thanks all!

Best Regards

Bai Shuweiv
-- 
Love other people, as same as love yourself!
Don't think all the time, do it by your hands!

E-Mail: baishuwei@gmail.com