X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f164662363901292b83d452b107a4f630473144a..f53020e729d583f7975095ca7b4b467741d99edb:/armsrc/des.c

diff --git a/armsrc/des.c b/armsrc/des.c
index 0a27503e..172b3235 100644
--- 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;
+	}
+ }
+
 /******************************************************************************/