generate hash key from a string , should init first

hash_key_generator.c

#include <string.h>
#include <stdio.h>

static unsigned long crypt[0x500];
void crypt_init();

#define PRIME_SIZE 32
static const unsigned long prime_list[PRIME_SIZE] =
{
  0ul,          3ul,          11ul,         23ul,         53ul,
  97ul,         193ul,        389ul,        769ul,        1543ul,
  3079ul,       6151ul,       12289ul,      24593ul,      49157ul,
  98317ul,      196613ul,     393241ul,     786433ul,     1572869ul,
  3145739ul,    6291469ul,    12582917ul,   25165843ul,   50331653ul,
  100663319ul,  201326611ul,  402653189ul,  805306457ul,  1610612741ul,
  3221225473ul, 4294967291ul
};

void crypt_init()  
{   
	unsigned long seed = 0x00100001, idx_a = 0, idx_b = 0, i;  

	for( idx_a = 0; idx_a < 0x100; idx_a++ )  
	{   
		for( idx_b = idx_a, i = 0; i < 5; i++, idx_b += 0x100 )  
		{   
			unsigned long t1, t2;  
			seed = (seed * 125 + 3) % 0x2AAAAB;  
			t1 = (seed & 0xFFFF) << 0x10;  
			seed = (seed * 125 + 3) % 0x2AAAAB;  
			t2 = (seed & 0xFFFF);  
			crypt[idx_b] = ( t1 | t2 );   
		}   
	}   
}

unsigned long hkg(const unsigned char * k, unsigned long offset)
{
	unsigned long seed_a = 0x7FED7FED, seed_b = 0xEEEEEEEE;  
	unsigned long ch;
	while(*k != 0)  
	{
		ch = (*k++);
		//ch = toupper(*k++);
		seed_a = crypt[(offset << 8) + ch] ^ (seed_a + seed_b);  
		seed_b = ch + seed_a + seed_b + (seed_b << 5) + 3;   
	}  
	return seed_a;
}

int main(int argc,char * argv[])
{
    crypt_init();
    const char * a0 = "string a";
    const char * a1 = "string a";
    const char * a2 = "STRING a";
    const char * a3 = "string b";
    const char * a4 = "中文 ";
    const char * a5 = "中文2";
    int i ;
    for(i = 0 ; i <PRIME_SIZE; i++ )
    {
        printf("[%2d] %-5lu\t",i,prime_list[i]);
        if((i+1) % 5 == 0 ) printf("\n");
    }
    printf("\n");
    printf("%lu ~ %lu\n",hkg(a0,0),hkg(a0,0)%prime_list[11]);
    printf("%lu ~ %lu\n",hkg(a0,0),hkg(a0,0)%prime_list[15]);
    printf("%lu\n",hkg(a1,0));
    printf("%lu\n",hkg(a2,0));
    printf("%lu\n",hkg(a3,0));
    printf("%lu\n",hkg(a4,0));
    printf("%lu\n",hkg(a5,0));
    
    return 0;
}