1First up, let me say I don't like writing in assembler. It is not portable,
2dependant on the particular CPU architecture release and is generally a pig
3to debug and get right. Having said that, the x86 architecture is probably
4the most important for speed due to number of boxes and since
5it appears to be the worst architecture to to get
6good C compilers for. So due to this, I have lowered myself to do
7assembler for the inner DES routines in libdes :-).
8
9The file to implement in assembler is des_enc.c. Replace the following
104 functions
| 1First up, let me say I don't like writing in assembler. It is not portable,
2dependant on the particular CPU architecture release and is generally a pig
3to debug and get right. Having said that, the x86 architecture is probably
4the most important for speed due to number of boxes and since
5it appears to be the worst architecture to to get
6good C compilers for. So due to this, I have lowered myself to do
7assembler for the inner DES routines in libdes :-).
8
9The file to implement in assembler is des_enc.c. Replace the following
104 functions
|
11des_encrypt(DES_LONG data[2],des_key_schedule ks, int encrypt);
| 11des_encrypt1(DES_LONG data[2],des_key_schedule ks, int encrypt);
|
12des_encrypt2(DES_LONG data[2],des_key_schedule ks, int encrypt);
13des_encrypt3(DES_LONG data[2],des_key_schedule ks1,ks2,ks3);
14des_decrypt3(DES_LONG data[2],des_key_schedule ks1,ks2,ks3);
15
16They encrypt/decrypt the 64 bits held in 'data' using
17the 'ks' key schedules. The only difference between the 4 functions is that
18des_encrypt2() does not perform IP() or FP() on the data (this is an
19optimization for when doing triple DES and des_encrypt3() and des_decrypt3()
--- 112 unchanged lines hidden --- | 12des_encrypt2(DES_LONG data[2],des_key_schedule ks, int encrypt);
13des_encrypt3(DES_LONG data[2],des_key_schedule ks1,ks2,ks3);
14des_decrypt3(DES_LONG data[2],des_key_schedule ks1,ks2,ks3);
15
16They encrypt/decrypt the 64 bits held in 'data' using
17the 'ks' key schedules. The only difference between the 4 functions is that
18des_encrypt2() does not perform IP() or FP() on the data (this is an
19optimization for when doing triple DES and des_encrypt3() and des_decrypt3()
--- 112 unchanged lines hidden --- |