00AG9603 CODES

/* 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 */



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]; }

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; }