Difference between revisions of "Random Numbers"
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| − | + | [[SubSpace]] uses random numbers primarily in its encryption, generating [[prize]]s, and controlling [[door]]s. | |
| + | |||
| + | The following code is used in generating the encrypted keystream, prizes, and doors: | ||
| + | <pre> | ||
| + | #define MULT_C 0x834E0B5F | ||
| + | #define DIV_C 0x1F31D | ||
| + | |||
| + | DWORD SS_RNG(DWORD seed) | ||
| + | { | ||
| + | DWORD nseed, temp; | ||
| + | |||
| + | temp = (MULT_C * (unsigned __int64)seed) >> 32; | ||
| + | temp = (temp >> 16) + (temp >> 31); //aka the sign bit | ||
| + | |||
| + | nseed = (seed % DIV_C) * 16807; | ||
| + | nseed -= (temp * 2836); | ||
| + | nseed += 123; | ||
| + | |||
| + | if (!nseed || nseed > 0x7FFFFFFF) | ||
| + | nseed += 0x7FFFFFFF; | ||
| + | |||
| + | return nseed; | ||
| + | } | ||
| + | </pre> | ||
| + | |||
| + | [[Category:Game Intricacies]] | ||
Latest revision as of 03:53, 30 November 2005
SubSpace uses random numbers primarily in its encryption, generating prizes, and controlling doors.
The following code is used in generating the encrypted keystream, prizes, and doors:
#define MULT_C 0x834E0B5F
#define DIV_C 0x1F31D
DWORD SS_RNG(DWORD seed)
{
DWORD nseed, temp;
temp = (MULT_C * (unsigned __int64)seed) >> 32;
temp = (temp >> 16) + (temp >> 31); //aka the sign bit
nseed = (seed % DIV_C) * 16807;
nseed -= (temp * 2836);
nseed += 123;
if (!nseed || nseed > 0x7FFFFFFF)
nseed += 0x7FFFFFFF;
return nseed;
}
