void USART0_SendData (unsigned char data[], unsigned char length) {
unsigned char i;
for(i=0; i<length; i++) {
USART0_SendByte(data[i]);
}
}
void getLargePrime(uint8_t* arr,uint32_t to){
#if RSADEBUG0==1
USART0_SendStr("Attempt: ");
#endif
uint32_t k=0;
do{
++k;
bigRandomTo(arr,to);
arr[0]|=1;
#if RSADEBUG0==1
USART0_SendNum(k);
if(k%20==0)
USART0_SendStr("\n");
else
USART0_SendByte(' ');
USART0_SendByte('\n');
bigPrint(arr);
#endif
}while(!isPrime(arr));
#if RSADEBUG0==1
USART0_SendStr("\n");
#endif
}
int32_t millerRabin(uint8_t* n){
//Most memory requirement part. mem=8*NUMLEN
#if RSADEBUG==1
USART0_SendStr("Start MR test:\n");
#endif
if(n[0]&1==0)
return 0;
uint32_t t=0;
int32_t i=0,k;
uint8_t temp;
uint8_t s[NUMLEN];
uint8_t a[NUMLEN];
int32_t next=0;
bigCopy(s,n);
s[0]^=1;//s=s-1
while(!s[i]){
++i;
t+=8;
}
temp=s[i];
while((temp&1)==0){
++t;
temp>>=1;
}
bigRShift(s,t);
k=0;
while(k<MILLER_RABIN_K){
#if RSADEBUG==1
USART0_SendByte('.');
#endif
n[0]|=1;
bigRandom(a,n);
bigExp(a,s,n);//a=a**s mod n
n[0]^=1;
if(!(bigIsOne(a)||bigEqual(a,n))){
next=0;
for(i=0;(i<t-1)&&!next;++i){
n[0]|=1;
bigMul(a,a,n);
if(bigIsOne(a)){
#if RSADEBUG==1
USART0_SendByte(' ');
#endif
return 0;
}
n[0]^=1;
if(bigEqual(a,n))
next=1;
}
if(!next){
#if RSADEBUG==1
USART0_SendByte(' ');
#endif
return 0;
}
}
k+=2;
}
#if RSADEBUG==1
USART0_SendStr("\n");
#endif
n[0]|=1;
return 1;
}