X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f168b2633b28e52e8ca08ace5f3e62f1767d9df2..61500621bcceb9b210ee2191f257244bf80de474:/armsrc/des.c

diff --git a/armsrc/des.c b/armsrc/des.c
index dbe62da9..f1aa80da 100644
--- a/armsrc/des.c
+++ b/armsrc/des.c
@@ -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 */
@@ -378,38 +378,53 @@ 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;