/* v3_akey.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/x509v3.h>

static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
			AUTHORITY_KEYID *akeyid, STACK_OF(CONF_VALUE) *extlist);
static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
			X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values);

X509V3_EXT_METHOD v3_akey_id = {
NID_authority_key_identifier, X509V3_EXT_MULTILINE, &AUTHORITY_KEYID_it,
0,0,0,0,
0,0,
(X509V3_EXT_I2V)i2v_AUTHORITY_KEYID,
(X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
0,0,
NULL
};

ASN1_SEQUENCE(AUTHORITY_KEYID) = {
	ASN1_IMP_OPT(AUTHORITY_KEYID, keyid, ASN1_OCTET_STRING, 0),
	ASN1_IMP_SEQUENCE_OF_OPT(AUTHORITY_KEYID, issuer, GENERAL_NAME, 1),
	ASN1_IMP_OPT(AUTHORITY_KEYID, serial, ASN1_INTEGER, 2)
} ASN1_SEQUENCE_END(AUTHORITY_KEYID);

IMPLEMENT_ASN1_FUNCTIONS(AUTHORITY_KEYID)

static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
	     AUTHORITY_KEYID *akeyid, STACK_OF(CONF_VALUE) *extlist)
{
	char *tmp;
	if(akeyid->keyid) {
		tmp = hex_to_string(akeyid->keyid->data, akeyid->keyid->length);
		X509V3_add_value("keyid", tmp, &extlist);
		OPENSSL_free(tmp);
	}
	if(akeyid->issuer) 
		extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
	if(akeyid->serial) {
		tmp = hex_to_string(akeyid->serial->data,
						 akeyid->serial->length);
		X509V3_add_value("serial", tmp, &extlist);
		OPENSSL_free(tmp);
	}
	return extlist;
}

/* Currently two options:
 * keyid: use the issuers subject keyid, the value 'always' means its is
 * an error if the issuer certificate doesn't have a key id.
 * issuer: use the issuers cert issuer and serial number. The default is
 * to only use this if keyid is not present. With the option 'always'
 * this is always included.
 */

static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
	     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values)
{
char keyid=0, issuer=0;
int i;
CONF_VALUE *cnf;
ASN1_OCTET_STRING *ikeyid = NULL;
X509_NAME *isname = NULL;
GENERAL_NAMES * gens = NULL;
GENERAL_NAME *gen = NULL;
ASN1_INTEGER *serial = NULL;
X509_EXTENSION *ext;
X509 *cert;
AUTHORITY_KEYID *akeyid;
for(i = 0; i < sk_CONF_VALUE_num(values); i++) {
	cnf = sk_CONF_VALUE_value(values, i);
	if(!strcmp(cnf->name, "keyid")) {
		keyid = 1;
		if(cnf->value && !strcmp(cnf->value, "always")) keyid = 2;
	} else if(!strcmp(cnf->name, "issuer")) {
		issuer = 1;
		if(cnf->value && !strcmp(cnf->value, "always")) issuer = 2;
	} else {
		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_UNKNOWN_OPTION);
		ERR_add_error_data(2, "name=", cnf->name);
		return NULL;
	}
}

if(!ctx || !ctx->issuer_cert) {
	if(ctx && (ctx->flags==CTX_TEST)) return AUTHORITY_KEYID_new();
	X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_NO_ISSUER_CERTIFICATE);
	return NULL;
}

cert = ctx->issuer_cert;

if(keyid) {
	i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);
	if((i >= 0)  && (ext = X509_get_ext(cert, i)))
						 ikeyid = X509V3_EXT_d2i(ext);
	if(keyid==2 && !ikeyid) {
		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
		return NULL;
	}
}

if((issuer && !ikeyid) || (issuer == 2)) {
	isname = X509_NAME_dup(X509_get_issuer_name(cert));
	serial = M_ASN1_INTEGER_dup(X509_get_serialNumber(cert));
	if(!isname || !serial) {
		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
		goto err;
	}
}

if(!(akeyid = AUTHORITY_KEYID_new())) goto err;

if(isname) {
	if(!(gens = sk_GENERAL_NAME_new_null()) || !(gen = GENERAL_NAME_new())
		|| !sk_GENERAL_NAME_push(gens, gen)) {
		X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,ERR_R_MALLOC_FAILURE);
		goto err;
	}
	gen->type = GEN_DIRNAME;
	gen->d.dirn = isname;
}

akeyid->issuer = gens;
akeyid->serial = serial;
akeyid->keyid = ikeyid;

return akeyid;

err:
X509_NAME_free(isname);
M_ASN1_INTEGER_free(serial);
M_ASN1_OCTET_STRING_free(ikeyid);
return NULL;

}