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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 <errno.h>
#include "pki.h"
#include <credentials/certificates/certificate.h>
#include <credentials/certificates/x509.h>
/**
* Extract a public key from a private key/certificate
*/
static int pub()
{
cred_encoding_type_t form = PUBKEY_SPKI_ASN1_DER;
credential_type_t type = CRED_PRIVATE_KEY;
int subtype = KEY_RSA;
certificate_t *cert;
private_key_t *private;
public_key_t *public;
chunk_t encoding;
char *file = NULL, *keyid = NULL;
void *cred;
char *arg;
while (TRUE)
{
switch (command_getopt(&arg))
{
case 'h':
return command_usage(NULL);
case 't':
if (streq(arg, "rsa"))
{
type = CRED_PRIVATE_KEY;
subtype = KEY_RSA;
}
else if (streq(arg, "ecdsa"))
{
type = CRED_PRIVATE_KEY;
subtype = KEY_ECDSA;
}
else if (streq(arg, "pub"))
{
type = CRED_PUBLIC_KEY;
subtype = KEY_ANY;
}
else if (streq(arg, "pkcs10"))
{
type = CRED_CERTIFICATE;
subtype = CERT_PKCS10_REQUEST;
}
else if (streq(arg, "x509"))
{
type = CRED_CERTIFICATE;
subtype = CERT_X509;
}
else
{
return command_usage("invalid input type");
}
continue;
case 'f':
if (!get_form(arg, &form, CRED_PUBLIC_KEY))
{
return command_usage("invalid output format");
}
continue;
case 'i':
file = arg;
continue;
case 'x':
keyid = arg;
continue;
case EOF:
break;
default:
return command_usage("invalid --pub option");
}
break;
}
if (file)
{
cred = lib->creds->create(lib->creds, type, subtype,
BUILD_FROM_FILE, file, BUILD_END);
}
else if (keyid)
{
chunk_t chunk;
chunk = chunk_from_hex(chunk_create(keyid, strlen(keyid)), NULL);
cred = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, KEY_ANY,
BUILD_PKCS11_KEYID, chunk, BUILD_END);
free(chunk.ptr);
}
else
{
chunk_t chunk;
set_file_mode(stdin, CERT_ASN1_DER);
if (!chunk_from_fd(0, &chunk))
{
fprintf(stderr, "reading input failed: %s\n", strerror(errno));
return 1;
}
cred = lib->creds->create(lib->creds, type, subtype,
BUILD_BLOB, chunk, BUILD_END);
free(chunk.ptr);
}
if (type == CRED_PRIVATE_KEY)
{
private = cred;
if (!private)
{
fprintf(stderr, "parsing private key failed\n");
return 1;
}
public = private->get_public_key(private);
private->destroy(private);
}
else if (type == CRED_PUBLIC_KEY)
{
public = cred;
if (!public)
{
fprintf(stderr, "parsing public key failed\n");
return 1;
}
}
else
{
cert = cred;
if (!cert)
{
fprintf(stderr, "parsing certificate failed\n");
return 1;
}
public = cert->get_public_key(cert);
cert->destroy(cert);
}
if (!public)
{
fprintf(stderr, "extracting public key failed\n");
return 1;
}
if (!public->get_encoding(public, form, &encoding))
{
fprintf(stderr, "public key encoding failed\n");
public->destroy(public);
return 1;
}
public->destroy(public);
set_file_mode(stdout, form);
if (fwrite(encoding.ptr, encoding.len, 1, stdout) != 1)
{
fprintf(stderr, "writing public 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) {
pub, 'p', "pub",
"extract the public key from a private key/certificate",
{"[--in file|--keyid hex] [--type rsa|ecdsa|pub|pkcs10|x509]",
"[--outform der|pem|dnskey|sshkey]"},
{
{"help", 'h', 0, "show usage information"},
{"in", 'i', 1, "input file, default: stdin"},
{"keyid", 'x', 1, "keyid on smartcard of private key"},
{"type", 't', 1, "type of credential, default: rsa"},
{"outform", 'f', 1, "encoding of extracted public key, default: der"},
}
});
}
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