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This commit is contained in:
Philippe Teuwen 2019-03-10 00:00:59 +01:00
commit 0373696662
483 changed files with 56514 additions and 52451 deletions
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34
common/tea.c
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@ -11,54 +11,56 @@
#define DELTA 0x9E3779B9
#define SUM 0xC6EF3720
void tea_encrypt(uint8_t *v, uint8_t *key) {
void tea_encrypt(uint8_t *v, uint8_t *key)
{
uint32_t a=0,b=0,c=0,d=0,y=0,z=0;
uint32_t a = 0, b = 0, c = 0, d = 0, y = 0, z = 0;
uint32_t sum = 0;
uint8_t n = ROUNDS;
//key
a = bytes_to_num(key, 4);
b = bytes_to_num(key+4, 4);
c = bytes_to_num(key+8, 4);
d = bytes_to_num(key+12, 4);
b = bytes_to_num(key + 4, 4);
c = bytes_to_num(key + 8, 4);
d = bytes_to_num(key + 12, 4);
//input
y = bytes_to_num(v, 4);
z = bytes_to_num(v+4, 4);
z = bytes_to_num(v + 4, 4);
while ( n-- > 0 ) {
while (n-- > 0) {
sum += DELTA;
y += ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
z += ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
}
num_to_bytes(y, 4, v);
num_to_bytes(z, 4, v+4);
num_to_bytes(z, 4, v + 4);
}
void tea_decrypt(uint8_t *v, uint8_t *key) {
void tea_decrypt(uint8_t *v, uint8_t *key)
{
uint32_t a=0,b=0,c=0,d=0,y=0,z=0;
uint32_t a = 0, b = 0, c = 0, d = 0, y = 0, z = 0;
uint32_t sum = SUM;
uint8_t n = ROUNDS;
//key
a = bytes_to_num(key, 4);
b = bytes_to_num(key+4, 4);
c = bytes_to_num(key+8, 4);
d = bytes_to_num(key+12, 4);
b = bytes_to_num(key + 4, 4);
c = bytes_to_num(key + 8, 4);
d = bytes_to_num(key + 12, 4);
//input
y = bytes_to_num(v, 4);
z = bytes_to_num(v+4, 4);
z = bytes_to_num(v + 4, 4);
/* sum = delta<<5, in general sum = delta * n */
while ( n-- > 0 ) {
while (n-- > 0) {
z -= ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
y -= ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
sum -= DELTA;
}
num_to_bytes(y, 4, v);
num_to_bytes(z, 4, v+4);
num_to_bytes(z, 4, v + 4);
}