PBC应用

CC签名

#include"pbc.h"
#include"pbc_time.h"
int main(void)
{
	pairing_t pairing;
	element_t P,Ppub,Qu,Su,V,W,temp;
	element_t s,r,h,temp1;
	element_t T1,T2;
	double time1,time2;
	int byte1,byte2;
	a_param_input(pairing);
	element_init_G1(P,pairing);
	element_init_G1(Ppub,pairing);
	element_init_G1(Qu,pairing);
	element_init_G1(Su,pairing);
	element_init_G1(V,pairing);
	element_init_G1(W,pairing);
	element_init_G1(temp,pairing);

	element_init_Zr(s,pairing);
	element_init_Zr(r,pairing);
	element_init_Zr(h,pairing);
	element_init_Zr(temp1,pairing);

	element_init_GT(T1,pairing);
	element_init_GT(T2,pairing);

	if(!pairing_is_symmetric(pairing))
	{
		fprintf(stderr,"only works with symmetric pairingn");
		exit(1);
	}
	printf("SetUpn");
	time1=get_time();
	element_random(s);
	element_random(P);
	element_mul_zn(Ppub,P,s);
	time2=get_time();
	element_printf("P=%Bn",P);
	element_printf("Ppub=%Bn",Ppub);

	printf("the time of setup phase = %fsb",time2-time1);
	printf("Extractn");
	
	time1=get_time();
	element_from_hash(Qu,"IDu",3);
	element_mul_zn(Su,Qu,s);
	time2=get_time();
	element_printf("Qu=%Bn",Qu);
	element_printf("Su=%Bn",Su);

	printf("the time of extract phase = %fsn",time2-time1);
	printf("Signn");

	time1=get_time();
	element_random(r);
	element_mul_zn(V,Qu,r);
	element_random(h);
	element_add(temp1,h,r);
	element_mul_zn(W,Su,temp1);
	time2=get_time();
	printf("the signature of message is:n");
	element_printf("V=%Bn",V);
	element_printf("W=%Bn",W);

	printf("the time of sign phase = %fsn",time2-time1);
	printf("Verifyn");
	
	time1=get_time();
	pairing_apply(T1,P,W,pairing);
	element_mul_zn(temp,Qu,h);
	element_add(temp,temp,V);
	pairing_apply(T2,Ppub,temp,pairing);

	if(!element_cmp(T1,T2))
		printf("the signature is valid!n");
	else
		printf("the signature is not valid!n");


	time2=get_time();
	element_printf("e(P,W)=%Bn",T1);
	element_printf("the time of verify phase= %fsn",time2-time1);
	byte1=element_length_in_bytes(W);
	byte2=element_length_in_bytes(V);

	printf("the bytes of signature = %dn",byte1+byte2);
    
    /*释放*/
	element_clear(P);
	element_clear(Ppub);
	element_clear(Qu);
	element_clear(Su);
	element_clear(W);
	element_clear(V);
	element_clear(temp);
	element_clear(s);
	element_clear(h);
	element_clear(r);
	element_clear(temp1);
	element_clear(T1);
	element_clear(T2);
	pairing_clear(pairing);
	return 0;
	
}

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