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/*
* Copyright (C) 2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pki.h"
/**
* Generate a private key
*/
static int gen()
{
cred_encoding_type_t form = PRIVKEY_ASN1_DER;
key_type_t type = KEY_RSA;
u_int size = 0, shares = 0, threshold = 1;
private_key_t *key;
chunk_t encoding;
bool safe_primes = FALSE;
char *arg;
while (TRUE)
{
switch (command_getopt(&arg))
{
case 'h':
return command_usage(NULL);
case 't':
if (streq(arg, "rsa"))
{
type = KEY_RSA;
}
else if (streq(arg, "ecdsa"))
{
type = KEY_ECDSA;
}
else
{
return command_usage("invalid key type");
}
continue;
case 'f':
if (!get_form(arg, &form, CRED_PRIVATE_KEY))
{
return command_usage("invalid key output format");
}
continue;
case 's':
size = atoi(arg);
if (!size)
{
return command_usage("invalid key size");
}
continue;
case 'p':
safe_primes = TRUE;
continue;
case 'n':
shares = atoi(arg);
if (shares < 2)
{
return command_usage("invalid number of key shares");
}
continue;
case 'l':
threshold = atoi(arg);
if (threshold < 1)
{
return command_usage("invalid key share threshold");
}
continue;
case EOF:
break;
default:
return command_usage("invalid --gen option");
}
break;
}
/* default key sizes */
if (!size)
{
switch (type)
{
case KEY_RSA:
size = 2048;
break;
case KEY_ECDSA:
size = 384;
break;
default:
break;
}
}
if (type == KEY_RSA && shares)
{
if (threshold > shares)
{
return command_usage("threshold is larger than number of shares");
}
key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, type,
BUILD_KEY_SIZE, size, BUILD_SAFE_PRIMES,
BUILD_SHARES, shares, BUILD_THRESHOLD, threshold,
BUILD_END);
}
else if (type == KEY_RSA && safe_primes)
{
key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, type,
BUILD_KEY_SIZE, size, BUILD_SAFE_PRIMES, BUILD_END);
}
else
{
key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, type,
BUILD_KEY_SIZE, size, BUILD_END);
}
if (!key)
{
fprintf(stderr, "private key generation failed\n");
return 1;
}
if (!key->get_encoding(key, form, &encoding))
{
fprintf(stderr, "private key encoding failed\n");
key->destroy(key);
return 1;
}
key->destroy(key);
if (fwrite(encoding.ptr, encoding.len, 1, stdout) != 1)
{
fprintf(stderr, "writing private key failed\n");
free(encoding.ptr);
return 1;
}
free(encoding.ptr);
return 0;
}
/**
* Register the command.
*/
static void __attribute__ ((constructor))reg()
{
command_register((command_t) {
gen, 'g', "gen", "generate a new private key",
{" [--type rsa|ecdsa] [--size bits] [--safe-primes]",
"[--shares n] [--threshold l] [--outform der|pem|pgp]"},
{
{"help", 'h', 0, "show usage information"},
{"type", 't', 1, "type of key, default: rsa"},
{"size", 's', 1, "keylength in bits, default: rsa 2048, ecdsa 384"},
{"safe-primes", 'p', 0, "generate rsa safe primes"},
{"shares", 'n', 1, "number of private rsa key shares"},
{"threshold", 'l', 1, "minimum number of participating rsa key shares"},
{"outform", 'f', 1, "encoding of generated private key"},
}
});
}
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