FIX; the "L" optional parameter for swapping endianess on used authentication key...

[proxmark3-svn] / armsrc / des.c

diff --git a/armsrc/des.c b/armsrc/des.c
index 0a27503e016d197e63d730a557b625cded147e63..172b32358dbf38aa96f30a25dcd0e118105d1634 100644 (file)
--- a/armsrc/des.c
+++ b/armsrc/des.c
@@ -378,6 +378,60 @@ 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;
+       }
+ }
+
 /******************************************************************************/