CHG: 'lf cotag demod' - now finds FC/CN Thanks to @marshmellow42

[proxmark3-svn] / common / tea.c

diff --git a/common/tea.c b/common/tea.c
index d0bea1c0edbcfda3e84685a6fe6e5bd061598329..616b4043bf6a84f6d7c378c4f5a863950adc5d21 100644 (file)
--- a/common/tea.c
+++ b/common/tea.c
@@ -10,8 +10,6 @@
 #define ROUNDS 32
 #define DELTA  0x9E3779B9
 #define SUM    0xC6EF3720
 #define ROUNDS 32
 #define DELTA  0x9E3779B9
 #define SUM    0xC6EF3720

-#define SWAPENDIAN(x)\
-  (x = (x >> 8 & 0xff00ff) | (x & 0xff00ff) << 8, x = x >> 16 | x << 16)

 
 void tea_encrypt(uint8_t *v, uint8_t *key) {
 
 
 void tea_encrypt(uint8_t *v, uint8_t *key) {
 


@@ -28,13 +26,6 @@ void tea_encrypt(uint8_t *v, uint8_t *key) {
        //input
        y = bytes_to_num(v, 4);
        z = bytes_to_num(v+4, 4);
        //input
        y = bytes_to_num(v, 4);
        z = bytes_to_num(v+4, 4);

-       
-       // SWAPENDIAN(a);
-       // SWAPENDIAN(b);
-       // SWAPENDIAN(c);
-       // SWAPENDIAN(d);
-       // SWAPENDIAN(y);
-       // SWAPENDIAN(z);

                
        while ( n-- > 0 ) {
                sum += DELTA;
                
        while ( n-- > 0 ) {
                sum += DELTA;


@@ -42,9 +33,6 @@ void tea_encrypt(uint8_t *v, uint8_t *key) {
                z += ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
        }
 
                z += ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
        }
 

-       // SWAPENDIAN(y);
-       // SWAPENDIAN(z);
-

        num_to_bytes(y, 4, v);
        num_to_bytes(z, 4, v+4);
 }
        num_to_bytes(y, 4, v);
        num_to_bytes(z, 4, v+4);
 }


@@ -65,22 +53,12 @@ void tea_decrypt(uint8_t *v, uint8_t *key) {
        y = bytes_to_num(v, 4);
        z = bytes_to_num(v+4, 4);
 
        y = bytes_to_num(v, 4);
        z = bytes_to_num(v+4, 4);
 

-       // SWAPENDIAN(a);
-       // SWAPENDIAN(b);
-       // SWAPENDIAN(c);
-       // SWAPENDIAN(d);
-       // SWAPENDIAN(y);
-       // SWAPENDIAN(z);
-       

        /* sum = delta<<5, in general sum = delta * n */
        while ( n-- > 0 ) {
                z -= ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
                y -= ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
                sum -= DELTA;
        }
        /* sum = delta<<5, in general sum = delta * n */
        while ( n-- > 0 ) {
                z -= ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
                y -= ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
                sum -= DELTA;
        }

-
-       // SWAPENDIAN(y);
-       // SWAPENDIAN(z);

        num_to_bytes(y, 4, v);
        num_to_bytes(z, 4, v+4);
 }
        num_to_bytes(y, 4, v);
        num_to_bytes(z, 4, v+4);
 }