ftu/main.c

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3.1 KiB
C
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2022-09-09 06:47:49 +00:00
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "blst/blst.h"
const byte dst[] = "MY-DST";
double time_taken;
clock_t t;
void printbytes(byte *toprint, int length){
for(int i=0;i<length;i++){
printf("%.2x ", toprint[i]);
}
printf("\n");
}
void signer(byte *compressed_signature, byte *compressed_public_key, byte *msg){
blst_scalar sk;
blst_p2 pk;
blst_p1 hash, signature;
byte debug_print_buf[256];
byte myikm[32] = {'*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*', '*'};
// On signer's side:
printf("IKM: ");
printbytes(myikm, 32);
blst_keygen(&sk, myikm, 32, 0, 0);
blst_bendian_from_scalar(debug_print_buf, &sk);
printf("Secret Key: ");
printbytes(debug_print_buf, 32);
blst_sk_to_pk_in_g2(&pk, &sk);
blst_p2_compress(compressed_public_key, &pk);
printf("Compressed Public Key: ");
printbytes(compressed_public_key, 96);
t = clock();
blst_hash_to_g1(&hash, msg, strlen((char *) msg), dst, strlen((char *) dst), 0, 0);
t = clock() - t;
time_taken = ((double)t)/CLOCKS_PER_SEC*1000.0;
printf("blst_hash_to_g1 took %f ms\n", time_taken);
blst_p1_serialize(debug_print_buf, &hash);
printf("Message Hash: ");
printbytes(debug_print_buf, 96);
t = clock();
blst_sign_pk_in_g2(&signature, &hash, &sk);
t = clock() - t;
time_taken = ((double)t)/CLOCKS_PER_SEC*1000.0;
printf("blst_sign_pk_in_g2 took %f ms\n", time_taken);
blst_p1_serialize(debug_print_buf, &signature);
printf("Signature: ");
printbytes(debug_print_buf, 96);
blst_p1_compress(compressed_signature, &signature);
printf("Compressed Signature: ");
printbytes(compressed_signature, 48);
}
void verifier(byte *compressed_signature, byte *compressed_public_key, byte *msg){
blst_p1_affine sig;
blst_p2_affine pk;
blst_p1_uncompress(&sig, compressed_signature);
blst_p2_uncompress(&pk, compressed_public_key);
BLST_ERROR returned;
// TODO: check if in g2 group
t = clock();
returned = blst_core_verify_pk_in_g2(&pk, &sig, 1, msg, strlen((char *) msg), dst, strlen((char *) dst), 0, 0);
t = clock() - t;
time_taken = ((double)t)/CLOCKS_PER_SEC*1000.0;
printf("blst_core_verify_pk_in_g2 took %f ms\n", time_taken);
if(returned == BLST_SUCCESS){
printf("Verified!\n");
}else{
printf("Not verified!\n");
}
}
int main(){
byte compressed_signature[48];
byte compressed_public_key[96];
byte msg[] = "assertion";
t = clock();
t = clock() - t;
time_taken = ((double)t)/CLOCKS_PER_SEC*1000.0;
printf("Doing nothing took %f ms\n", time_taken);
printf("msg is now %s\n", msg);
// Sign the message and get the results back
signer(compressed_signature, compressed_public_key, msg);
//msg[8] = 'A';
printf("msg is now %s\n", msg);
// Now on verifier's side (after compressed_signature, serialized_public_key, and msg are passed over the network)
verifier(compressed_signature, compressed_public_key, msg);
}