/* frontend to IBE_construct_key() in ibe_lib.c * (constructs private key shares into a private key) * Ben Lynn *//*Copyright (C) 2001 Benjamin Lynn (blynn@cs.stanford.edu)See LICENSE for license*/#include <openssl/evp.h>#include "format.h"#include "ibe_progs.h"int combine(int argc, char **argv){    char **ksfiles;    int i;    char *id;    char s[100];    char pw[100];    int status;    int count = IBE_threshold(params);    char *privkeyfile = GetStringParam(cnfctx, "keyfile", 0, "keyfile");    byte_string_t key;    byte_string_t *kshare;    if (argc < 3) {	fprintf(stderr, "Usage: combine ID KEYFILES...\n");	return 1;    }    id = FMT_make_id(argv[1], NULL, params);    if (argc - 2 < count) {	fprintf(stderr, "not enough pieces to make a private key\n");	return 1;    }    kshare = (byte_string_t *) malloc(count * sizeof(byte_string_t));    ksfiles = (char **) malloc(count * sizeof(char *));    for (i=0; i<count; i++) {	ksfiles[i] = argv[i+2];	sprintf(s, "password for %s: ", ksfiles[i]);	status = EVP_read_pw_string(pw, 100, s, 1);	if (status) {	    fprintf(stderr, "error reading password\n");	    return 1;	}	status = FMT_crypt_load(ksfiles[i], kshare[i], pw);	if (!status) {	    fprintf(stderr, "error loading %s\n", ksfiles[i]);	    return 1;	}    }    IBE_combine(key, kshare, params);    status = EVP_read_pw_string(pw, 100, "private key password: ", 1);    if (status) {	fprintf(stderr, "error reading password\n");	return 1;    }    FMT_crypt_save(privkeyfile, key, pw);    for (i=0; i<count; i++) {	byte_string_clear(kshare[i]);    }    free(kshare);    free(ksfiles);    return 0;}