crashtest-r0ket/firmware/l0dable/pwgen.c

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2011-08-04 19:49:33 +00:00
#include "basic/basic.h"
#include "usetable.h"
#define PW_LEN 8
void pw_cleanup(char * pw);
void pw_set(char * pw, uint16_t * k);
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void ram(void)
{
char pw[PW_LEN+1];
uint16_t k[8];
int button;
memset(k, 0, 16);
while(1){
lcdClear();
lcdNl();
lcdPrintln(" password");
lcdPrintln(" generator");
lcdNl();
lcdNl();
pw_set(pw,k);
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pw_cleanup(pw);
lcdPrint(" ");
lcdPrintln(pw);
lcdRefresh();
delayms(23);
while((button=getInputRaw())==BTN_NONE)
delayms(23);
if(button==BTN_LEFT) return;
}
}
void pw_cleanup(char * pw)
{
int i;
for(i=0;i<PW_LEN;i++)
{
/* strip unwanted ascii chars */
pw[i]&=0x7f;
if(pw[i]<0x30)pw[i]+=0x30;
if(pw[i]>0x7a)pw[i]-=0x10;
if((pw[i]>'Z')&&(pw[i]<'a'))
pw[i]-=0x10;
}
}
void pw_set(char * pw, uint16_t * k)
{
int i;
memset(pw,0,PW_LEN); /* wipe old PW */
for(i=0;i<4;i++)
k[1]=getRandom();
xxtea_encode_words(pw,PW_LEN/4,k);
pw[PW_LEN]=0;
}