Merge pull request #81 from mdp/fixguard

[proxmark3-svn] / armsrc / des.c

diff --git a/armsrc/des.c b/armsrc/des.c
index 513f89bfeb9c17124361aafc047074cd0ba08519..78ae87447b766ef9d17e9bf5b201249d2b914e5e 100644 (file)
--- a/armsrc/des.c
+++ b/armsrc/des.c
@@ -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);
 }
 
 /******************************************************************************/