Merge pull request #81 from mdp/fixguard

[proxmark3-svn] / armsrc / des.c

diff --git a/armsrc/des.c b/armsrc/des.c
index 0a27503e016d197e63d730a557b625cded147e63..78ae87447b766ef9d17e9bf5b201249d2b914e5e 100644 (file)
--- a/armsrc/des.c
+++ b/armsrc/des.c
@@ -25,8 +25,8 @@
  * \license     GPLv3 or later
  * 
  */
-#include <stdint.h>
-#include <string.h>
+
+#include "des.h"
 
 const uint8_t sbox[256]  = {
   /* S-box 1 */
@@ -210,7 +210,7 @@ void permute(const uint8_t *ptable, const uint8_t *in, uint8_t *out){
        for(byte=0; byte<ob; ++byte){
                uint8_t x,t=0;
                for(bit=0; bit<8; ++bit){
-                       x=*ptable++ -1 ;
+                       x = *ptable++ - 1;
                                t<<=1;
                        if((in[x/8]) & (0x80>>(x%8)) ){
                                t|=0x01;
@@ -274,7 +274,7 @@ uint32_t des_f(uint32_t r, uint8_t* kr){
        uint64_t data;
        uint8_t *sbp; /* sboxpointer */ 
        permute((uint8_t*)e_permtab, (uint8_t*)&r, (uint8_t*)&data);
-       for(i=0; i<7; ++i)
+       for(i=0; i<6; ++i)
                ((uint8_t*)&data)[i] ^= kr[i];
        
        /* Sbox substitution */
@@ -296,15 +296,24 @@ uint32_t des_f(uint32_t r, uint8_t* kr){
 
 /******************************************************************************/
 
+typedef struct {
+       union {
+               uint8_t  v8[8];
+               uint32_t v32[2];
+       } d;
+} data_t;
+#define R (data.d.v32[1])
+#define L (data.d.v32[0])
+
 void des_enc(void* out, const void* in, const void* key){
-#define R *((uint32_t*)&(data[4]))
-#define L *((uint32_t*)&(data[0]))
 
-       uint8_t data[8],kr[6],k[7];
+       uint8_t kr[6], k[7];
        uint8_t i;
+       data_t data;
        
-       permute((uint8_t*)ip_permtab, (uint8_t*)in, data);
+       permute((uint8_t*)ip_permtab, (uint8_t*)in, data.d.v8);
        permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
+
        for(i=0; i<8; ++i){
                shiftkey(k);
                if(ROTTABLE&((1<<((i<<1)+0))) )
@@ -324,18 +333,18 @@ void des_enc(void* out, const void* in, const void* key){
        L ^= R;
        R ^= L;
        
-       permute((uint8_t*)inv_ip_permtab, data, (uint8_t*)out);
+       permute((uint8_t*)inv_ip_permtab, data.d.v8, (uint8_t*)out);
 }
 
 /******************************************************************************/
 
 void des_dec(void* out, const void* in, const uint8_t* key){
-#define R *((uint32_t*)&(data[4]))
-#define L *((uint32_t*)&(data[0]))
 
-       uint8_t data[8],kr[6],k[7];
+       uint8_t kr[6],k[7];
        int8_t i;
-       permute((uint8_t*)ip_permtab, (uint8_t*)in, data);
+       data_t data;
+       
+       permute((uint8_t*)ip_permtab, (uint8_t*)in, data.d.v8);
        permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
        for(i=7; i>=0; --i){
                
@@ -359,7 +368,7 @@ void des_dec(void* out, const void* in, const uint8_t* key){
        L ^= R;
        R ^= L;
        
-       permute((uint8_t*)inv_ip_permtab, data, (uint8_t*)out);
+       permute((uint8_t*)inv_ip_permtab, data.d.v8, (uint8_t*)out);
 }
 
 /******************************************************************************/
@@ -378,6 +387,60 @@ void tdes_dec(void* out, void* in, const uint8_t* key){
        des_dec(out, out, (uint8_t*)key + 0);
 }
 
+ void tdes_2key_enc(void* out, const void* in, size_t length, const void* key, unsigned char iv[8]){
+
+       if( length % 8 ) return; 
+
+       uint8_t i;
+       uint8_t* tin = (uint8_t*) in;
+       uint8_t* tout = (uint8_t*) out;
+       
+       while( length > 0 )
+       {
+               for( i = 0; i < 8; i++ )
+                               tout[i] = (unsigned char)( tin[i] ^ iv[i] );
+               
+               des_enc(tout,  tin, (uint8_t*)key + 0);
+               des_dec(tout, tout, (uint8_t*)key + 8);
+               des_enc(tout, tout, (uint8_t*)key + 0);
+               
+               memcpy( iv, tout, 8 );
+               
+               tin  += 8;
+               tout += 8;
+               length -= 8;
+       }
+ }
+ 
+ void tdes_2key_dec(void* out, const void* in, size_t length, const void* key, unsigned char iv[8]){
+       
+       if( length % 8 ) return; 
+
+       uint8_t i;
+       unsigned char temp[8];
+       uint8_t* tin = (uint8_t*) in;
+       uint8_t* tout = (uint8_t*) out;
+       
+       while( length > 0 )
+       {
+               memcpy( temp, tin, 8 );
+               
+               des_dec(tout,  tin, (uint8_t*)key + 0);
+               des_enc(tout, tout, (uint8_t*)key + 8);
+               des_dec(tout, tout, (uint8_t*)key + 0);          
+
+               for( i = 0; i < 8; i++ )
+                       tout[i] = (unsigned char)( tout[i] ^ iv[i] );
+
+               memcpy( iv, temp, 8 );
+               
+               tin  += 8;
+               tout += 8;
+               length -= 8;
+       }
+ }
+
+
 /******************************************************************************/