/*

 * Copyright 1999-2025 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/conf.h>

#include <openssl/x509v3.h>

#include "ext_dat.h"

static BIT_STRING_BITNAME ns_cert_type_table[] = {

    { 0, "SSL Client", "client" },

    { 1, "SSL Server", "server" },

    { 2, "S/MIME", "email" },

    { 3, "Object Signing", "objsign" },

    { 4, "Unused", "reserved" },

    { 5, "SSL CA", "sslCA" },

    { 6, "S/MIME CA", "emailCA" },

    { 7, "Object Signing CA", "objCA" },

    { -1, NULL, NULL }

};

static BIT_STRING_BITNAME key_usage_type_table[] = {

    { 0, "Digital Signature", "digitalSignature" },

    { 1, "Non Repudiation", "nonRepudiation" },

    { 1, "Content Commitment", "contentCommitment" },

    { 2, "Key Encipherment", "keyEncipherment" },

    { 3, "Data Encipherment", "dataEncipherment" },

    { 4, "Key Agreement", "keyAgreement" },

    { 5, "Certificate Sign", "keyCertSign" },

    { 6, "CRL Sign", "cRLSign" },

    { 7, "Encipher Only", "encipherOnly" },

    { 8, "Decipher Only", "decipherOnly" },

    { -1, NULL, NULL }

};

const X509V3_EXT_METHOD ossl_v3_nscert = EXT_BITSTRING(NID_netscape_cert_type, ns_cert_type_table);

const X509V3_EXT_METHOD ossl_v3_key_usage = EXT_BITSTRING(NID_key_usage, key_usage_type_table);

STACK_OF(CONF_VALUE) *i2v_ASN1_BIT_STRING(X509V3_EXT_METHOD *method,

    ASN1_BIT_STRING *bits,

    STACK_OF(CONF_VALUE) *ret)

{

    BIT_STRING_BITNAME *bnam;

    int last_seen_bit = -1;

    for (bnam = method->usr_data; bnam->lname; bnam++) {

        /*

         * If the bitnumber did not change from the last iteration, this entry

         * is an an alias for the previous bit; treat the first result as

         * canonical and ignore the rest.

         */

        if (last_seen_bit == bnam->bitnum)

            continue;

        last_seen_bit = bnam->bitnum;

        if (ASN1_BIT_STRING_get_bit(bits, bnam->bitnum))

            X509V3_add_value(bnam->lname, NULL, &ret);

    }

    return ret;

}

ASN1_BIT_STRING *v2i_ASN1_BIT_STRING(X509V3_EXT_METHOD *method,

    X509V3_CTX *ctx,

    STACK_OF(CONF_VALUE) *nval)

{

    CONF_VALUE *val;

    ASN1_BIT_STRING *bs;

    int i;

    BIT_STRING_BITNAME *bnam;

    if ((bs = ASN1_BIT_STRING_new()) == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

        return NULL;

    }

    for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {

        val = sk_CONF_VALUE_value(nval, i);

        for (bnam = method->usr_data; bnam->lname; bnam++) {

            if (strcmp(bnam->sname, val->name) == 0

                || strcmp(bnam->lname, val->name) == 0) {

                if (!ASN1_BIT_STRING_set_bit(bs, bnam->bitnum, 1)) {

                    ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);

                    ASN1_BIT_STRING_free(bs);

                    return NULL;

                }

                break;

            }

        }

        if (!bnam->lname) {

            ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_BIT_STRING_ARGUMENT,

                "%s", val->name);

            ASN1_BIT_STRING_free(bs);

            return NULL;

        }

    }

    return bs;

}