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Initial commit for Encode/Decode.

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benthompson15
2020-11-06 15:23:24 -06:00
parent 84fb821c47
commit 3e9b7b3401
9 changed files with 320 additions and 4 deletions
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56
utils/funcexp/sql_crypt.cpp Normal file
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#include <cstdlib>
#include <string>
using namespace std;
#include "sql_crypt.h"
namespace funcexp
{
void SQL_CRYPT::init(ulong *rand_nr)
{
uint i;
my_rnd_init(&rand,rand_nr[0],rand_nr[1]);
for (i=0 ; i<=255; i++)
decode_buff[i]= (char) i;
for (i=0 ; i<= 255 ; i++)
{
int idx= (uint) (my_rnd(&rand)*255.0);
char a= decode_buff[idx];
decode_buff[idx]= decode_buff[i];
decode_buff[+i]=a;
}
for (i=0 ; i <= 255 ; i++)
encode_buff[(unsigned char) decode_buff[i]]=i;
org_rand=rand;
shift=0;
}
void SQL_CRYPT::encode(char *str,uint length)
{
for (uint i=0; i < length; i++)
{
shift^=(uint) (my_rnd(&rand)*255.0);
uint idx= (uint) (unsigned char) str[0];
*str++ = (char) ((unsigned char) encode_buff[idx] ^ shift);
shift^= idx;
}
}
void SQL_CRYPT::decode(char *str,uint length)
{
for (uint i=0; i < length; i++)
{
shift^=(uint) (my_rnd(&rand)*255.0);
uint idx= (uint) ((unsigned char) str[0] ^ shift);
*str = decode_buff[idx];
shift^= (uint) (unsigned char) *str++;
}
}
}