X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/aa60d1560ece20fe93fb22f9ee60c897e96f2b42..d23f3f2c9a0680d925f9282e535e60fcaed94a4a:/armsrc/des.c

diff --git a/armsrc/des.c b/armsrc/des.c
index cb44751f..172b3235 100644
--- a/armsrc/des.c
+++ b/armsrc/des.c
@@ -378,38 +378,54 @@ 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){
+ 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){
+ 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;