/* for testing; extracts a key share given a server's master share * (users should never have access to any master share) * also constructs any private key given * the share files (which in real life would never be together in one place) * Ben Lynn *//*Copyright (C) 2001 Benjamin Lynn (blynn@cs.stanford.edu)See LICENSE for license*/#include <stdlib.h>#include <openssl/evp.h>#include "format.h"#include "ibe_progs.h"int extract_share(int argc, char **argv){    char *id;    char *sfile;    byte_string_t mshare, kshare;    if (argc < 3) {	fprintf(stderr, "Usage: extract_share ID SHAREFILE\n");	return 1;    }    id = FMT_make_id(argv[1], NULL, params);    sfile = argv[2];    FMT_load_byte_string(sfile, mshare);    IBE_extract_share(kshare, mshare, id, params);    FMT_crypt_save_fp(stdout, kshare, "password");    return 0;}int key_from_master_shares(int argc, char **argv){    char *id;    int count = IBE_threshold(params);    char **sfiles;    int i;    char *privkeyfile;    byte_string_t key;    byte_string_t master;    if (argc < 3) {	fprintf(stderr, "Usage: construct_private ID SHAREFILES...\n");	return 1;    }    if (argc - 2 < count) {	fprintf(stderr, "not enough pieces to make a private key\n");	return 1;    }    id = FMT_make_id(argv[1], NULL, params);    sfiles = (char **) malloc(count * sizeof(char*));    for (i=0; i<count; i++) {	sfiles[i] = argv[i+2];    }    privkeyfile = GetStringParam(cnfctx, "keyfile", 0, "keyfile");    if (!FMT_construct_master(master, sfiles, count, params)) {	fprintf(stderr, "at least one bad share file!\n");	return 1;    }    IBE_extract(key, master, id, params);    FMT_crypt_save(privkeyfile, key, "password");    byte_string_clear(master);    byte_string_clear(key);    return 0;}int fixed_password_decrypt(int argc, char **argv){    char *privkeyfile = GetStringParam(cnfctx, "keyfile", 0, "keyfile");    byte_string_t key;    int status;    char *id;    if (argc < 2) {	printf("Usage: fixed_password_decrypt ID\n\n");	printf("Decrypts stdin and prints on stdout\n");	printf("Reads private key from file specified in config file\n");	printf("Assumes file has been encrypted with \"password\"\n");	return 1;    }    id = FMT_make_id(argv[1], NULL, params);    status = FMT_crypt_load(privkeyfile, key, "password");    if (status != 1) {	fprintf(stderr, "error loading private key %s\n", privkeyfile);	return 1;    }    FMT_decrypt_stream(id, key, stdin, stdout, params);    byte_string_clear(key);    return 0;}