FANDOM


/* XTEA
/* 00AG9603
v gives the plaintext of 2 words
k gives the key of 4 words
N gives the number of cycles, 32 are recommended
if negative causes decoding, N must be the same as
  for coding
if zero causes no coding or decoding
assumes 32 bit "long" and same endian coding or

  decoding */

Ooa














tean(long *v,long *k,long N)
{
unsigned long y = v[0],z = v[1],DELTA = 0x9e3779b9;
unsigned long limit,sum;
 
if (N > 0) /* the "if" code performs encryption */
 {
 limit = DELTA * N;
 sum = 0;
 while (sum != limit)
   y += (z << 4^z >> 5) + z^sum + k[sum&3],
   sum += DELTA,
   z += (y << 4^y >> 5) + y^sum + k[sum >> 11&3];
 }
00a2







else    /* the "else" code performs decryption */
  {     /* IT IS TRULY MINUSCULE */
 sum = DELTA * (-N);
 while (sum)
   z -= (y << 4^y >> 5) + y^sum + k[sum>>11&3],
   sum -= DELTA,
   y -= (z << 4^z >> 5) + z^sum + k[sum&3];

 }



v[0] = y;
v[1] = z;
return;
}

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