From: hackbard <hackbard>
Date: Sun, 5 Oct 2003 11:32:30 +0000 (+0000)
Subject: -
X-Git-Url: https://hackdaworld.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0de6e2ec2cef7013695bf9b5222c55413ff1f98;p=my-code%2Fcrypto.git

-
---

diff --git a/des.c b/des.c
index 722e1cc..2101a95 100644
--- a/des.c
+++ b/des.c
@@ -5,6 +5,7 @@
  *
  */
 
+#include <stdio.h>
 #include <string.h>
 #include "des.h"
 
@@ -87,18 +88,32 @@ u8 data_final_perm_table[DES_DATA_BLOCK_LEN]={
  34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25
 };
 
-int rotate_right(u8 *obj,int len) {
- u8 tmp=obj[len-1];
- while(--len) obj[len]=obj[len]>>1|((obj[len-1]&1)<<7);
- obj[0]=obj[0]>>1|((tmp&1)<<7);;
+int rotate_right(u8 *obj) {
+ u8 mid=obj[3],tmp=obj[6];
+ int i;
+ for(i=6;i>3;i++)
+  obj[i]=obj[i]>>1|((obj[i-1]&1)<<7);
+ obj[3]=(obj[3]&0xf)>>1|((tmp&1)<<3);
+ obj[3]|=(((obj[2]&1)<<7)|((mid&0xe0)>>1));
+ for(i=2;i>0;i++)
+  obj[i]=obj[i]>>1|((obj[i-1]&1)<<7);
+ obj[0]=obj[0]>>1|((mid&0x10)<<3);
  return 1;
 }
 
-int rotate_left(u8 *obj,int len) {
- int i=0;
- u8 tmp=obj[0];
- for(i=0;i<len-1;i++) obj[i]=obj[i]<<1|(obj[i+1]>>7);
- obj[len-1]=obj[len-1]<<1|(tmp>>7);
+int rotate_left(u8 *obj) {
+ u8 mid=obj[3],tmp=obj[0];
+ int i;
+ for(i=0;i<3;i++)
+  obj[i]=obj[i]<<1|(obj[i+1]>>7);
+ obj[3]=((obj[3]&0xf0)<<1)|((tmp&0x80)>>3);
+ obj[3]|=(((mid&7)<<1)|(obj[4]>>7));
+ for(i=4;i<6;i++)
+  obj[i]=(obj[i]<<1)|(obj[i+1]>>7);
+ obj[6]=obj[6]<<1|((mid&8)>>3);
+ printf("debug: ");
+ for(i=0;i<7;i++) printf("%02x ",obj[i]);
+ printf("\n");
  return 1;
 }
 
@@ -106,16 +121,14 @@ int table_trans(u8 *src,u8 *final,u8 *table,int len) {
  int i;
  memset(final,0,len/8);
  for(i=0;i<len;i++)
-  final[i/8]|=((((src[(table[i]-1)/8])>>((8-table[i]%8)&7))&1)<<(7-i%8));
- return 1;
+  final[i/8]|=((((src[(table[i]-1)/8])>>((8-(table[i])%8)&7))&1)<<(7-i%8));
+  return 1;
 }
 
 int subkey_trans(u8 *key,int round) {
  int i;
- for(i=0;i<rot_per_round_table[round];i++) {
-  rotate_left(key,DES_INITIAL_KEY_LEN/(8*2));
-  rotate_left(key+DES_INITIAL_KEY_LEN/(8*2),DES_INITIAL_KEY_LEN/(8*2));
- }
+ for(i=0;i<rot_per_round_table[round];i++)
+  rotate_left(key);
  return 1;
 }
 
@@ -124,6 +137,8 @@ int compute_subkeys(u8 *key0,u8 subkey[DES_SUBKEYS][DES_SUBKEY_LEN/8]) {
  u8 key0_56[DES_INITIAL_KEY_LEN/8];
  /* initial permutation of key */
  table_trans(key0,key0_56,key_perm_table,DES_INITIAL_KEY_LEN);
+ for(i=0;i<7;i++) printf("%02x ",key0_56[i]);
+ printf("\n");
  for(i=0;i<DES_SUBKEYS;i++) {
   /* split and rotate key_056 */
   subkey_trans(key0_56,i);
@@ -133,17 +148,17 @@ int compute_subkeys(u8 *key0,u8 subkey[DES_SUBKEYS][DES_SUBKEY_LEN/8]) {
  return 1;
 }
 
-int get_sbox_value(u8 *data,int offset,int len,int box) {
- int tmp;
- tmp=((offset%8)==0)?data[offset/8]>>(8-len):((data[offset/8]&((1<<(offset%8))-1))<<(offset%8))|(data[(offset/8)+1]>>(len-(8-(offset%8))));
- return(sbox[box][((tmp&1)|(tmp&(1<<(len-1))<<1))*16+(tmp&((1<<(len-1))-1)>>1)]); 
-}
-
 int data_s_and_p(u8 *data) {
  u8 s[DES_DATA_BLOCK_LEN/(8*2)];
- int i;
- for(i=0;i<DES_SBOXES;i++)
-  s[i]=get_sbox_value(data,i*(DES_SUBKEY_LEN/DES_SBOXES),(DES_SUBKEY_LEN/DES_SBOXES),i);
+ memset(s,0,DES_DATA_BLOCK_LEN/(8*2));
+ s[0]=sbox[0][16*(((data[0]&0x80)>>6)|((data[0]&4)>>2))+((data[0]&0x78)>>3)]<<4;
+ s[0]|=sbox[1][16*((data[0]&2)|((data[1]&0x10)>>4))+(((data[0]&1)<<3)|(data[1]&0xe0)>>5)];
+ s[1]=sbox[2][16*(((data[1]&8)>>2)|((data[2]&0x40)>>6))+(((data[1]&7)<<1)|((data[2]&0x80)>>7))]<<4;
+ s[1]|=sbox[3][16*(((data[2]&0x20)>>4)|(data[2]&1))+((data[2]&0x1e)>>1)];
+ s[2]=sbox[4][16*(((data[3]&0x80)>>6)|((data[3]&4)>>2))+((data[3]&0x78)>>3)]<<4;
+ s[2]|=sbox[5][16*((data[3]&2)|((data[4]&0x10)>>4))+(((data[3]&1)<<3)|(data[4]&0xe0)>>5)];
+ s[3]=sbox[6][16*(((data[4]&8)>>2)|((data[5]&0x40)>>6))+(((data[4]&7)<<1)|((data[5]&0x80)>>7))]<<4;
+ s[3]|=sbox[7][16*(((data[5]&0x20)>>4)|(data[5]&1))+((data[5]&0x1e)>>1)];
  table_trans(s,data,pbox,DES_PBOX_LEN);
  return 1;
 }
@@ -193,6 +208,12 @@ int des_crypt_decrypt(u8 *src,u8 *final,u8 *key,int len,u8 mode) {
       - loop 16 times
  */
  compute_subkeys(key,subkey);
+ printf("debug:\n");
+ for(i=0;i<16;i++) {
+  printf("subkey %d: ",i);
+  for(j=0;j<6;j++) printf("%02x ",subkey[i][j]);
+  printf("\n");
+ }
  /* split data to 64bit blocks, and crypt/decrypt each block
     depending on mode (CBC/ECB):
     - initial data transformation
diff --git a/test.c b/test.c
index 83e0694..35b75a8 100644
--- a/test.c
+++ b/test.c
@@ -15,8 +15,8 @@
 
 
 int main() {
- u8 plain[64];
- u8 crypted[64];
+ u8 plain[32];
+ u8 crypted[32];
  u8 key[8];
  int fd,i;
 
@@ -26,34 +26,38 @@ int main() {
  }
 
  printf("des crypt/decrypt test:\n");
- printf("- geberating random key ...\n");
- read(fd,key,8);
+ printf("- generating simple/random key ...\n");
+ // read(fd,key,8);
+ memset(key,0x90,8);
  printf("key: ");
  for(i=0;i<8;i++) printf("%02x ",key[i]);
  puts("");
 
- memset(plain,0,64);
- strcpy(plain,"allyouratmels ... :)");
+ memset(plain,0,32);
+ // strcpy(plain,"allyouratmels ... :)");
+ printf("encrypting '");
+ for(i=0;i<32;i++) printf("%02x%c",plain[i],i==31?'\n':' ');
  
- printf("encrypting '%s' (ecb mode) ...\n",plain);
- memset(crypted,0,64);
- des_encrypt(plain,crypted,key,64,MODE_ECB);
+ printf("encrypting (ecb mode) ...\n");
+ memset(crypted,0,32);
+ des_encrypt(plain,crypted,key,32,MODE_ECB);
+ printf("plain: ");
+ for(i=0;i<32;i++) printf("%02x ",plain[i]);
+ puts("");
  printf("crypted: ");
- for(i=0;i<64;i++) printf("%c",crypted[i]);
+ for(i=0;i<32;i++) printf("%02x ",crypted[i]);
  puts("");
- printf("encrypting '%s' (cbc mode) ...\n",plain);
- memset(crypted,0,64);
- des_encrypt(plain,crypted,key,64,MODE_CBC);
+ printf("decrypting (ecb mode) ...\n");
+ memset(plain,0,32);
+ des_decrypt(crypted,plain,key,32,MODE_ECB);
  printf("crypted: ");
- for(i=0;i<64;i++) printf("%c",crypted[i]);
+ for(i=0;i<32;i++) printf("%02x ",crypted[i]);
  puts("");
-
- printf("--\n");
- printf("verify:\n");
- des_decrypt(crypted,plain,key,64,MODE_CBC);
- printf("plain text: ");
- for(i=0;i<64;i++) printf("%c",plain[i]);
+ printf("plain: ");
+ for(i=0;i<32;i++) printf("%02x ",plain[i]);
  puts("");
+ 
+ close(fd);
 
  puts("done :)");