/*
 * Written by Dr Stephen N Henson (steve@openssl.org) 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 "internal/cryptlib.h"
#include <openssl/x509v3.h>
#include "internal/x509_int.h"
#include "ext_dat.h"

static ASN1_OCTET_STRING *s2i_skey_id(X509V3_EXT_METHOD *method,
                                      X509V3_CTX *ctx, char *str);
const X509V3_EXT_METHOD v3_skey_id = {
    NID_subject_key_identifier, 0, ASN1_ITEM_ref(ASN1_OCTET_STRING),
    0, 0, 0, 0,
    (X509V3_EXT_I2S)i2s_ASN1_OCTET_STRING,
    (X509V3_EXT_S2I)s2i_skey_id,
    0, 0, 0, 0,
    NULL
};

char *i2s_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method, ASN1_OCTET_STRING *oct)
{
    return OPENSSL_buf2hexstr(oct->data, oct->length);
}

ASN1_OCTET_STRING *s2i_ASN1_OCTET_STRING(X509V3_EXT_METHOD *method,
                                         X509V3_CTX *ctx, char *str)
{
    ASN1_OCTET_STRING *oct;
    long length;

    if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
        X509V3err(X509V3_F_S2I_ASN1_OCTET_STRING, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    if ((oct->data = OPENSSL_hexstr2buf(str, &length)) == NULL) {
        ASN1_OCTET_STRING_free(oct);
        return NULL;
    }

    oct->length = length;

    return oct;

}

static ASN1_OCTET_STRING *s2i_skey_id(X509V3_EXT_METHOD *method,
                                      X509V3_CTX *ctx, char *str)
{
    ASN1_OCTET_STRING *oct;
    X509_PUBKEY *pubkey;
    const unsigned char *pk;
    int pklen;
    unsigned char pkey_dig[EVP_MAX_MD_SIZE];
    unsigned int diglen;

    if (strcmp(str, "hash"))
        return s2i_ASN1_OCTET_STRING(method, ctx, str);

    if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
        X509V3err(X509V3_F_S2I_SKEY_ID, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    if (ctx && (ctx->flags == CTX_TEST))
        return oct;

    if (!ctx || (!ctx->subject_req && !ctx->subject_cert)) {
        X509V3err(X509V3_F_S2I_SKEY_ID, X509V3_R_NO_PUBLIC_KEY);
        goto err;
    }

    if (ctx->subject_req)
        pubkey = ctx->subject_req->req_info.pubkey;
    else
        pubkey = ctx->subject_cert->cert_info.key;

    if (pubkey == NULL) {
        X509V3err(X509V3_F_S2I_SKEY_ID, X509V3_R_NO_PUBLIC_KEY);
        goto err;
    }

    X509_PUBKEY_get0_param(NULL, &pk, &pklen, NULL, pubkey);

    if (!EVP_Digest(pk, pklen, pkey_dig, &diglen, EVP_sha1(), NULL))
        goto err;

    if (!ASN1_OCTET_STRING_set(oct, pkey_dig, diglen)) {
        X509V3err(X509V3_F_S2I_SKEY_ID, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    return oct;

 err:
    ASN1_OCTET_STRING_free(oct);
    return NULL;
}