X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fcrypto.git;a=blobdiff_plain;f=des.c;h=a001060759c6023d40c734fe23cc92fa95d5b7b1;hp=2101a9520a5731198ca3f5972bf4a30e1cbed65d;hb=refs%2Fheads%2Fmaster;hpb=f0de6e2ec2cef7013695bf9b5222c55413ff1f98

diff --git a/des.c b/des.c
index 2101a95..a001060 100644
--- a/des.c
+++ b/des.c
@@ -5,7 +5,6 @@
  *
  */
 
-#include <stdio.h>
 #include <string.h>
 #include "des.h"
 
@@ -111,9 +110,6 @@ int rotate_left(u8 *obj) {
  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;
 }
 
@@ -137,8 +133,6 @@ 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);
@@ -182,11 +176,15 @@ int progress_data(u8 *data,u8 *crypted,u8 subkey[DES_SUBKEYS][DES_SUBKEY_LEN/8],
   /* sbox substitutions and pbox permutations */
   data_s_and_p(permuted_data);
   /* xor with left data */
-  memcpy(tmp,right,DES_DATA_BLOCK_LEN/(2*8));
-  for(j=0;j<DES_DATA_BLOCK_LEN/(2*8);j++)    
-   right[j]=permuted_data[j]^left[j];
-  /* switch left and right data - not for last round */
-  if(i!=15) memcpy(left,tmp,DES_DATA_BLOCK_LEN/(2*8)); 
+  if(i!=15) {
+   memcpy(tmp,right,DES_DATA_BLOCK_LEN/(2*8));
+   for(j=0;j<DES_DATA_BLOCK_LEN/(2*8);j++)    
+    right[j]=permuted_data[j]^left[j];
+   /* switch left and right data - not for last round */
+   memcpy(left,tmp,DES_DATA_BLOCK_LEN/(2*8));
+  }
+  else
+   for(j=0;j<DES_DATA_BLOCK_LEN/(2*8);j++) left[j]^=permuted_data[j];
  }
  /* merge and do final permutation */
  memcpy(permuted_data,left,DES_DATA_BLOCK_LEN/(2*8));
@@ -208,12 +206,6 @@ 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