add reveal method

bls/main.cpp

@@ -53,12 +53,28 @@ struct pub_key_type {
     int len;
 };
 
+struct signature_type {
+    char *data;
+    int len;
+};
+
+struct hash_type {
+    char *data;
+    int len;
+};
+
+
 struct Game {
     bool new_game(int n) {
         len = 0;
         players = (char**)malloc(sizeof(char*) * n);
         stakes = (int*)malloc(sizeof(int) * n);
         game_id = game_id_autoinc++;
+        signs = (signature_type*)malloc(sizeof(signature_type) * n);
+        reveals = 0;
+        threshold = n * 2 / 3 + 1;
+        winner = -1;
+
 
         state = STATE_GATHERING_STAKES;
         return true;
@@ -107,6 +123,26 @@ struct Game {
         return state;
     }
 
+    bool reveal(pub_key_type pub_key, hash_type game_id_hash, signature_type sign) {
+        blsSignature s;
+        blsPublicKey pk;
+
+        mclBnG1_setStr(&s.v, sign.data, sign.len, 512);
+        mclBnG2_setStr(&pk.v, pub_key.data, pub_key.len, 0);
+
+        if (!blsVerify(&s, &pk, game_id_hash.data, game_id_hash.len)) {
+            return;
+        }
+
+        signs[reveals++] = sign;
+
+        if (reveals == threshold) {
+            winner = players[blsAggregate(signs, reveals)];
+        }
+
+        state = STATE_DONE;
+    }
+
 private:
     bool compare(char *a, char *b, int len) {
         for (int i = 0; i < len; i++) {