PEM_read_RSA_PUBKEY
keys[0] = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL);
keys[1] = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL);
keys[i] = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL);
keys[i] = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL);