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void encrypt(uint32_t* v) {
	  uint32_t v0=v[0], v1=v[1], sum=0, i;             // set up
	  uint32_t delta=0x9e3779b9;                       // a key schedule constant
	  for (i=0; i < 32; i++) {                         // basic cycle start
	    sum += delta;
	    v0 += ((v1<<4) + KEY[0]) ^ (v1 + sum) ^ ((v1>>5) + KEY[1]);
	    v1 += ((v0<<4) + KEY[2]) ^ (v0 + sum) ^ ((v0>>5) + KEY[3]);  
	  }                                                // end cycle 
	  v[0]=v0; v[1]=v1;
}
	
void decrypt (uint32_t* v) {
  uint32_t v0=v[0], v1=v[1], sum=0xC6EF3720, i;  // set up 
  uint32_t delta=0x9e3779b9;                     // a key schedule constant 
  for (i=0; i<32; i++) {                         // basic cycle start 
    v1 -= ((v0<<4) + KEY[2]) ^ (v0 + sum) ^ ((v0>>5) + KEY[3]);
    v0 -= ((v1<<4) + KEY[0]) ^ (v1 + sum) ^ ((v1>>5) + KEY[1]);
    sum -= delta;
  }                                              // end cycle 
  
  v[0]=v0; v[1]=v1;
}