/* $OpenBSD: asn1_gen.c,v 1.28 2025/05/10 05:54:38 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2002.
 */
/* ====================================================================
 * Copyright (c) 2002 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 <string.h>

#include <openssl/asn1.h>
#include <openssl/x509v3.h>

#include "asn1_local.h"
#include "conf_local.h"
#include "err_local.h"
#include "x509_local.h"

#define ASN1_GEN_FLAG           0x10000
#define ASN1_GEN_FLAG_IMP       (ASN1_GEN_FLAG|1)
#define ASN1_GEN_FLAG_EXP       (ASN1_GEN_FLAG|2)
#define ASN1_GEN_FLAG_TAG       (ASN1_GEN_FLAG|3)
#define ASN1_GEN_FLAG_BITWRAP   (ASN1_GEN_FLAG|4)
#define ASN1_GEN_FLAG_OCTWRAP   (ASN1_GEN_FLAG|5)
#define ASN1_GEN_FLAG_SEQWRAP   (ASN1_GEN_FLAG|6)
#define ASN1_GEN_FLAG_SETWRAP   (ASN1_GEN_FLAG|7)
#define ASN1_GEN_FLAG_FORMAT    (ASN1_GEN_FLAG|8)

#define ASN1_GEN_STR(str,val){str, sizeof(str) - 1, val}

#define ASN1_FLAG_EXP_MAX       20

/* Input formats */

/* ASCII: default */
#define ASN1_GEN_FORMAT_ASCII   1
/* UTF8 */
#define ASN1_GEN_FORMAT_UTF8    2
/* Hex */
#define ASN1_GEN_FORMAT_HEX     3
/* List of bits */
#define ASN1_GEN_FORMAT_BITLIST 4

struct tag_name_st {
        const char *strnam;
        int len;
        int tag;
};

typedef struct {
        int exp_tag;
        int exp_class;
        int exp_constructed;
        int exp_pad;
        long exp_len;
} tag_exp_type;

typedef struct {
        int imp_tag;
        int imp_class;
        int utype;
        int format;
        const char *str;
        tag_exp_type exp_list[ASN1_FLAG_EXP_MAX];
        int exp_count;
} tag_exp_arg;

static int bitstr_cb(const char *elem, int len, void *bitstr);
static int asn1_cb(const char *elem, int len, void *bitstr);
static int append_exp(tag_exp_arg *arg, int exp_tag, int exp_class,
    int exp_constructed, int exp_pad, int imp_ok);
static int parse_tagging(const char *vstart, int vlen, int *ptag, int *pclass);
static ASN1_TYPE *asn1_multi(int utype, const char *section, X509V3_CTX *cnf);
static ASN1_TYPE *asn1_str2type(const char *str, int format, int utype);
static int asn1_str2tag(const char *tagstr, int len);

ASN1_TYPE *
ASN1_generate_nconf(const char *str, CONF *nconf)
{
        X509V3_CTX cnf;

        if (!nconf)
                return ASN1_generate_v3(str, NULL);

        X509V3_set_nconf(&cnf, nconf);
        return ASN1_generate_v3(str, &cnf);
}
LCRYPTO_ALIAS(ASN1_generate_nconf);

ASN1_TYPE *
ASN1_generate_v3(const char *str, X509V3_CTX *cnf)
{
        ASN1_TYPE *ret;
        tag_exp_arg asn1_tags;
        tag_exp_type *etmp;

        int i, len;

        unsigned char *orig_der = NULL, *new_der = NULL;
        const unsigned char *cpy_start;
        unsigned char *p;
        const unsigned char *cp;
        int cpy_len;
        long hdr_len = 0;
        int hdr_constructed = 0, hdr_tag, hdr_class;
        int r;

        asn1_tags.imp_tag = -1;
        asn1_tags.imp_class = -1;
        asn1_tags.format = ASN1_GEN_FORMAT_ASCII;
        asn1_tags.exp_count = 0;
        if (CONF_parse_list(str, ',', 1, asn1_cb, &asn1_tags) != 0)
                return NULL;

        if ((asn1_tags.utype == V_ASN1_SEQUENCE) ||
            (asn1_tags.utype == V_ASN1_SET)) {
                if (!cnf) {
                        ASN1error(ASN1_R_SEQUENCE_OR_SET_NEEDS_CONFIG);
                        return NULL;
                }
                ret = asn1_multi(asn1_tags.utype, asn1_tags.str, cnf);
        } else
                ret = asn1_str2type(asn1_tags.str, asn1_tags.format,
                    asn1_tags.utype);

        if (!ret)
                return NULL;

        /* If no tagging return base type */
        if ((asn1_tags.imp_tag == -1) && (asn1_tags.exp_count == 0))
                return ret;

        /* Generate the encoding */
        cpy_len = i2d_ASN1_TYPE(ret, &orig_der);
        ASN1_TYPE_free(ret);
        ret = NULL;
        /* Set point to start copying for modified encoding */
        cpy_start = orig_der;

        /* Do we need IMPLICIT tagging? */
        if (asn1_tags.imp_tag != -1) {
                /* If IMPLICIT we will replace the underlying tag */
                /* Skip existing tag+len */
                r = ASN1_get_object(&cpy_start, &hdr_len, &hdr_tag,
                    &hdr_class, cpy_len);
                if (r & 0x80)
                        goto err;
                /* Update copy length */
                cpy_len -= cpy_start - orig_der;
                /* For IMPLICIT tagging the length should match the
                 * original length and constructed flag should be
                 * consistent.
                 */
                if (r & 0x1) {
                        /* Indefinite length constructed */
                        hdr_constructed = 2;
                        hdr_len = 0;
                } else
                        /* Just retain constructed flag */
                        hdr_constructed = r & V_ASN1_CONSTRUCTED;
                /* Work out new length with IMPLICIT tag: ignore constructed
                 * because it will mess up if indefinite length
                 */
                len = ASN1_object_size(0, hdr_len, asn1_tags.imp_tag);
        } else
                len = cpy_len;

        /* Work out length in any EXPLICIT, starting from end */

        for (i = 0, etmp = asn1_tags.exp_list + asn1_tags.exp_count - 1;
            i < asn1_tags.exp_count; i++, etmp--) {
                /* Content length: number of content octets + any padding */
                len += etmp->exp_pad;
                etmp->exp_len = len;
                /* Total object length: length including new header */
                len = ASN1_object_size(0, len, etmp->exp_tag);
        }

        /* Allocate buffer for new encoding */

        new_der = malloc(len);
        if (!new_der)
                goto err;

        /* Generate tagged encoding */
        p = new_der;

        /* Output explicit tags first */
        for (i = 0, etmp = asn1_tags.exp_list; i < asn1_tags.exp_count;
            i++, etmp++) {
                ASN1_put_object(&p, etmp->exp_constructed, etmp->exp_len,
                    etmp->exp_tag, etmp->exp_class);
                if (etmp->exp_pad)
                        *p++ = 0;
        }

        /* If IMPLICIT, output tag */

        if (asn1_tags.imp_tag != -1) {
                if (asn1_tags.imp_class == V_ASN1_UNIVERSAL &&
                    (asn1_tags.imp_tag == V_ASN1_SEQUENCE ||
                    asn1_tags.imp_tag == V_ASN1_SET))
                        hdr_constructed = V_ASN1_CONSTRUCTED;
                ASN1_put_object(&p, hdr_constructed, hdr_len,
                    asn1_tags.imp_tag, asn1_tags.imp_class);
        }

        /* Copy across original encoding */
        memcpy(p, cpy_start, cpy_len);

        cp = new_der;

        /* Obtain new ASN1_TYPE structure */
        ret = d2i_ASN1_TYPE(NULL, &cp, len);

 err:
        free(orig_der);
        free(new_der);

        return ret;
}
LCRYPTO_ALIAS(ASN1_generate_v3);

static int
asn1_cb(const char *elem, int len, void *bitstr)
{
        tag_exp_arg *arg = bitstr;
        int i;
        int utype;
        int vlen = 0;
        const char *p, *vstart = NULL;

        int tmp_tag, tmp_class;

        for (i = 0, p = elem; i < len; p++, i++) {
                /* Look for the ':' in name value pairs */
                if (*p == ':') {
                        vstart = p + 1;
                        vlen = len - (vstart - elem);
                        len = p - elem;
                        break;
                }
        }

        utype = asn1_str2tag(elem, len);

        if (utype == -1) {
                ASN1error(ASN1_R_UNKNOWN_TAG);
                ERR_asprintf_error_data("tag=%s", elem);
                return -1;
        }

        /* If this is not a modifier mark end of string and exit */
        if (!(utype & ASN1_GEN_FLAG)) {
                arg->utype = utype;
                arg->str = vstart;
                /* If no value and not end of string, error */
                if (!vstart && elem[len]) {
                        ASN1error(ASN1_R_MISSING_VALUE);
                        return -1;
                }
                return 0;
        }

        switch (utype) {

        case ASN1_GEN_FLAG_IMP:
                /* Check for illegal multiple IMPLICIT tagging */
                if (arg->imp_tag != -1) {
                        ASN1error(ASN1_R_ILLEGAL_NESTED_TAGGING);
                        return -1;
                }
                if (!parse_tagging(vstart, vlen, &arg->imp_tag,
                    &arg->imp_class))
                        return -1;
                break;

        case ASN1_GEN_FLAG_EXP:
                if (!parse_tagging(vstart, vlen, &tmp_tag, &tmp_class))
                        return -1;
                if (!append_exp(arg, tmp_tag, tmp_class, 1, 0, 0))
                        return -1;
                break;

        case ASN1_GEN_FLAG_SEQWRAP:
                if (!append_exp(arg, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL, 1, 0, 1))
                        return -1;
                break;

        case ASN1_GEN_FLAG_SETWRAP:
                if (!append_exp(arg, V_ASN1_SET, V_ASN1_UNIVERSAL, 1, 0, 1))
                        return -1;
                break;

        case ASN1_GEN_FLAG_BITWRAP:
                if (!append_exp(arg, V_ASN1_BIT_STRING, V_ASN1_UNIVERSAL, 0, 1, 1))
                        return -1;
                break;

        case ASN1_GEN_FLAG_OCTWRAP:
                if (!append_exp(arg, V_ASN1_OCTET_STRING, V_ASN1_UNIVERSAL, 0, 0, 1))
                        return -1;
                break;

        case ASN1_GEN_FLAG_FORMAT:
                if (vstart == NULL) {
                        ASN1error(ASN1_R_ILLEGAL_FORMAT);
                        return -1;
                }
                if (!strncmp(vstart, "ASCII", 5))
                        arg->format = ASN1_GEN_FORMAT_ASCII;
                else if (!strncmp(vstart, "UTF8", 4))
                        arg->format = ASN1_GEN_FORMAT_UTF8;
                else if (!strncmp(vstart, "HEX", 3))
                        arg->format = ASN1_GEN_FORMAT_HEX;
                else if (!strncmp(vstart, "BITLIST", 7))
                        arg->format = ASN1_GEN_FORMAT_BITLIST;
                else {
                        ASN1error(ASN1_R_UNKOWN_FORMAT);
                        return -1;
                }
                break;

        }

        return 1;
}

static int
parse_tagging(const char *vstart, int vlen, int *ptag, int *pclass)
{
        long tag_num;
        char *eptr;

        if (!vstart)
                return 0;
        tag_num = strtoul(vstart, &eptr, 10);
        /* Check we haven't gone past max length: should be impossible */
        if (eptr && *eptr && (eptr > vstart + vlen))
                return 0;
        if (tag_num < 0) {
                ASN1error(ASN1_R_INVALID_NUMBER);
                return 0;
        }
        *ptag = tag_num;
        /* If we have non numeric characters, parse them */
        if (eptr)
                vlen -= eptr - vstart;
        else
                vlen = 0;
        if (vlen) {
                switch (*eptr) {

                case 'U':
                        *pclass = V_ASN1_UNIVERSAL;
                        break;

                case 'A':
                        *pclass = V_ASN1_APPLICATION;
                        break;

                case 'P':
                        *pclass = V_ASN1_PRIVATE;
                        break;

                case 'C':
                        *pclass = V_ASN1_CONTEXT_SPECIFIC;
                        break;

                default:
                        ASN1error(ASN1_R_INVALID_MODIFIER);
                        ERR_asprintf_error_data("Char=%c", *eptr);
                        return 0;
                        break;

                }
        } else
                *pclass = V_ASN1_CONTEXT_SPECIFIC;

        return 1;

}

/* Handle multiple types: SET and SEQUENCE */

static ASN1_TYPE *
asn1_multi(int utype, const char *section, X509V3_CTX *cnf)
{
        ASN1_TYPE *ret = NULL;
        STACK_OF(ASN1_TYPE) *sk = NULL;
        STACK_OF(CONF_VALUE) *sect = NULL;
        unsigned char *der = NULL;
        int derlen;
        int i;
        sk = sk_ASN1_TYPE_new_null();
        if (!sk)
                goto bad;
        if (section) {
                if (!cnf)
                        goto bad;
                sect = X509V3_get0_section(cnf, section);
                if (!sect)
                        goto bad;
                for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
                        ASN1_TYPE *typ = ASN1_generate_v3(
                            sk_CONF_VALUE_value(sect, i)->value, cnf);
                        if (!typ)
                                goto bad;
                        if (!sk_ASN1_TYPE_push(sk, typ))
                                goto bad;
                }
        }

        /* Now we has a STACK of the components, convert to the correct form */

        if (utype == V_ASN1_SET)
                derlen = i2d_ASN1_SET_ANY(sk, &der);
        else
                derlen = i2d_ASN1_SEQUENCE_ANY(sk, &der);

        if (derlen < 0)
                goto bad;

        if (!(ret = ASN1_TYPE_new()))
                goto bad;

        if (!(ret->value.asn1_string = ASN1_STRING_type_new(utype)))
                goto bad;

        ret->type = utype;

        ret->value.asn1_string->data = der;
        ret->value.asn1_string->length = derlen;

        der = NULL;

 bad:
        free(der);
        sk_ASN1_TYPE_pop_free(sk, ASN1_TYPE_free);

        return ret;
}

static int
append_exp(tag_exp_arg *arg, int exp_tag, int exp_class, int exp_constructed,
    int exp_pad, int imp_ok)
{
        tag_exp_type *exp_tmp;

        /* Can only have IMPLICIT if permitted */
        if ((arg->imp_tag != -1) && !imp_ok) {
                ASN1error(ASN1_R_ILLEGAL_IMPLICIT_TAG);
                return 0;
        }

        if (arg->exp_count == ASN1_FLAG_EXP_MAX) {
                ASN1error(ASN1_R_DEPTH_EXCEEDED);
                return 0;
        }

        exp_tmp = &arg->exp_list[arg->exp_count++];

        /* If IMPLICIT set tag to implicit value then
         * reset implicit tag since it has been used.
         */
        if (arg->imp_tag != -1) {
                exp_tmp->exp_tag = arg->imp_tag;
                exp_tmp->exp_class = arg->imp_class;
                arg->imp_tag = -1;
                arg->imp_class = -1;
        } else {
                exp_tmp->exp_tag = exp_tag;
                exp_tmp->exp_class = exp_class;
        }
        exp_tmp->exp_constructed = exp_constructed;
        exp_tmp->exp_pad = exp_pad;

        return 1;
}

static int
asn1_str2tag(const char *tagstr, int len)
{
        unsigned int i;
        const struct tag_name_st *tntmp;
        static const struct tag_name_st tnst[] = {
                ASN1_GEN_STR("BOOL", V_ASN1_BOOLEAN),
                ASN1_GEN_STR("BOOLEAN", V_ASN1_BOOLEAN),
                ASN1_GEN_STR("NULL", V_ASN1_NULL),
                ASN1_GEN_STR("INT", V_ASN1_INTEGER),
                ASN1_GEN_STR("INTEGER", V_ASN1_INTEGER),
                ASN1_GEN_STR("ENUM", V_ASN1_ENUMERATED),
                ASN1_GEN_STR("ENUMERATED", V_ASN1_ENUMERATED),
                ASN1_GEN_STR("OID", V_ASN1_OBJECT),
                ASN1_GEN_STR("OBJECT", V_ASN1_OBJECT),
                ASN1_GEN_STR("UTCTIME", V_ASN1_UTCTIME),
                ASN1_GEN_STR("UTC", V_ASN1_UTCTIME),
                ASN1_GEN_STR("GENERALIZEDTIME", V_ASN1_GENERALIZEDTIME),
                ASN1_GEN_STR("GENTIME", V_ASN1_GENERALIZEDTIME),
                ASN1_GEN_STR("OCT", V_ASN1_OCTET_STRING),
                ASN1_GEN_STR("OCTETSTRING", V_ASN1_OCTET_STRING),
                ASN1_GEN_STR("BITSTR", V_ASN1_BIT_STRING),
                ASN1_GEN_STR("BITSTRING", V_ASN1_BIT_STRING),
                ASN1_GEN_STR("UNIVERSALSTRING", V_ASN1_UNIVERSALSTRING),
                ASN1_GEN_STR("UNIV", V_ASN1_UNIVERSALSTRING),
                ASN1_GEN_STR("IA5", V_ASN1_IA5STRING),
                ASN1_GEN_STR("IA5STRING", V_ASN1_IA5STRING),
                ASN1_GEN_STR("UTF8", V_ASN1_UTF8STRING),
                ASN1_GEN_STR("UTF8String", V_ASN1_UTF8STRING),
                ASN1_GEN_STR("BMP", V_ASN1_BMPSTRING),
                ASN1_GEN_STR("BMPSTRING", V_ASN1_BMPSTRING),
                ASN1_GEN_STR("VISIBLESTRING", V_ASN1_VISIBLESTRING),
                ASN1_GEN_STR("VISIBLE", V_ASN1_VISIBLESTRING),
                ASN1_GEN_STR("PRINTABLESTRING", V_ASN1_PRINTABLESTRING),
                ASN1_GEN_STR("PRINTABLE", V_ASN1_PRINTABLESTRING),
                ASN1_GEN_STR("T61", V_ASN1_T61STRING),
                ASN1_GEN_STR("T61STRING", V_ASN1_T61STRING),
                ASN1_GEN_STR("TELETEXSTRING", V_ASN1_T61STRING),
                ASN1_GEN_STR("GeneralString", V_ASN1_GENERALSTRING),
                ASN1_GEN_STR("GENSTR", V_ASN1_GENERALSTRING),
                ASN1_GEN_STR("NUMERIC", V_ASN1_NUMERICSTRING),
                ASN1_GEN_STR("NUMERICSTRING", V_ASN1_NUMERICSTRING),

                /* Special cases */
                ASN1_GEN_STR("SEQUENCE", V_ASN1_SEQUENCE),
                ASN1_GEN_STR("SEQ", V_ASN1_SEQUENCE),
                ASN1_GEN_STR("SET", V_ASN1_SET),
                /* type modifiers */
                /* Explicit tag */
                ASN1_GEN_STR("EXP", ASN1_GEN_FLAG_EXP),
                ASN1_GEN_STR("EXPLICIT", ASN1_GEN_FLAG_EXP),
                /* Implicit tag */
                ASN1_GEN_STR("IMP", ASN1_GEN_FLAG_IMP),
                ASN1_GEN_STR("IMPLICIT", ASN1_GEN_FLAG_IMP),
                /* OCTET STRING wrapper */
                ASN1_GEN_STR("OCTWRAP", ASN1_GEN_FLAG_OCTWRAP),
                /* SEQUENCE wrapper */
                ASN1_GEN_STR("SEQWRAP", ASN1_GEN_FLAG_SEQWRAP),
                /* SET wrapper */
                ASN1_GEN_STR("SETWRAP", ASN1_GEN_FLAG_SETWRAP),
                /* BIT STRING wrapper */
                ASN1_GEN_STR("BITWRAP", ASN1_GEN_FLAG_BITWRAP),
                ASN1_GEN_STR("FORM", ASN1_GEN_FLAG_FORMAT),
                ASN1_GEN_STR("FORMAT", ASN1_GEN_FLAG_FORMAT),
        };

        if (len == -1)
                len = strlen(tagstr);

        tntmp = tnst;
        for (i = 0; i < sizeof(tnst) / sizeof(struct tag_name_st);
            i++, tntmp++) {
                if ((len == tntmp->len) && !strncmp(tntmp->strnam, tagstr, len))
                        return tntmp->tag;
        }

        return -1;
}

static ASN1_TYPE *
asn1_str2type(const char *str, int format, int utype)
{
        ASN1_TYPE *atmp = NULL;
        CONF_VALUE vtmp;
        unsigned char *rdata;
        long rdlen;
        int no_unused = 1;

        if (!(atmp = ASN1_TYPE_new())) {
                ASN1error(ERR_R_MALLOC_FAILURE);
                return NULL;
        }

        if (!str)
                str = "";

        switch (utype) {

        case V_ASN1_NULL:
                if (str && *str) {
                        ASN1error(ASN1_R_ILLEGAL_NULL_VALUE);
                        goto bad_form;
                }
                break;

        case V_ASN1_BOOLEAN:
                if (format != ASN1_GEN_FORMAT_ASCII) {
                        ASN1error(ASN1_R_NOT_ASCII_FORMAT);
                        goto bad_form;
                }
                vtmp.name = NULL;
                vtmp.section = NULL;
                vtmp.value = (char *)str;
                if (!X509V3_get_value_bool(&vtmp, &atmp->value.boolean)) {
                        ASN1error(ASN1_R_ILLEGAL_BOOLEAN);
                        goto bad_str;
                }
                break;

        case V_ASN1_INTEGER:
        case V_ASN1_ENUMERATED:
                if (format != ASN1_GEN_FORMAT_ASCII) {
                        ASN1error(ASN1_R_INTEGER_NOT_ASCII_FORMAT);
                        goto bad_form;
                }
                if (!(atmp->value.integer =
                    s2i_ASN1_INTEGER(NULL, (char *)str))) {
                        ASN1error(ASN1_R_ILLEGAL_INTEGER);
                        goto bad_str;
                }
                break;

        case V_ASN1_OBJECT:
                if (format != ASN1_GEN_FORMAT_ASCII) {
                        ASN1error(ASN1_R_OBJECT_NOT_ASCII_FORMAT);
                        goto bad_form;
                }
                if (!(atmp->value.object = OBJ_txt2obj(str, 0))) {
                        ASN1error(ASN1_R_ILLEGAL_OBJECT);
                        goto bad_str;
                }
                break;

        case V_ASN1_UTCTIME:
        case V_ASN1_GENERALIZEDTIME:
                if (format != ASN1_GEN_FORMAT_ASCII) {
                        ASN1error(ASN1_R_TIME_NOT_ASCII_FORMAT);
                        goto bad_form;
                }
                if (!(atmp->value.asn1_string = ASN1_STRING_new())) {
                        ASN1error(ERR_R_MALLOC_FAILURE);
                        goto bad_str;
                }
                if (!ASN1_STRING_set(atmp->value.asn1_string, str, -1)) {
                        ASN1error(ERR_R_MALLOC_FAILURE);
                        goto bad_str;
                }
                atmp->value.asn1_string->type = utype;
                if (!ASN1_TIME_check(atmp->value.asn1_string)) {
                        ASN1error(ASN1_R_ILLEGAL_TIME_VALUE);
                        goto bad_str;
                }
                break;

        case V_ASN1_BMPSTRING:
        case V_ASN1_PRINTABLESTRING:
        case V_ASN1_IA5STRING:
        case V_ASN1_T61STRING:
        case V_ASN1_UTF8STRING:
        case V_ASN1_VISIBLESTRING:
        case V_ASN1_UNIVERSALSTRING:
        case V_ASN1_GENERALSTRING:
        case V_ASN1_NUMERICSTRING:

                if (format == ASN1_GEN_FORMAT_ASCII)
                        format = MBSTRING_ASC;
                else if (format == ASN1_GEN_FORMAT_UTF8)
                        format = MBSTRING_UTF8;
                else {
                        ASN1error(ASN1_R_ILLEGAL_FORMAT);
                        goto bad_form;
                }

                if (ASN1_mbstring_copy(&atmp->value.asn1_string,
                    (unsigned char *)str, -1, format,
                    ASN1_tag2bit(utype)) <= 0) {
                        ASN1error(ERR_R_MALLOC_FAILURE);
                        goto bad_str;
                }
                break;

        case V_ASN1_BIT_STRING:
        case V_ASN1_OCTET_STRING:
                if (!(atmp->value.asn1_string = ASN1_STRING_new())) {
                        ASN1error(ERR_R_MALLOC_FAILURE);
                        goto bad_form;
                }

                if (format == ASN1_GEN_FORMAT_HEX) {

                        if (!(rdata = string_to_hex((char *)str, &rdlen))) {
                                ASN1error(ASN1_R_ILLEGAL_HEX);
                                goto bad_str;
                        }

                        atmp->value.asn1_string->data = rdata;
                        atmp->value.asn1_string->length = rdlen;
                        atmp->value.asn1_string->type = utype;

                } else if (format == ASN1_GEN_FORMAT_ASCII) {
                        if (ASN1_STRING_set(atmp->value.asn1_string, str,
                            -1) == 0) {
                                ASN1error(ERR_R_MALLOC_FAILURE);
                                goto bad_str;
                        }
                } else if ((format == ASN1_GEN_FORMAT_BITLIST) &&
                    (utype == V_ASN1_BIT_STRING)) {
                        if (!CONF_parse_list(str, ',', 1, bitstr_cb,
                            atmp->value.bit_string)) {
                                ASN1error(ASN1_R_LIST_ERROR);
                                goto bad_str;
                        }
                        no_unused = 0;

                } else {
                        ASN1error(ASN1_R_ILLEGAL_BITSTRING_FORMAT);
                        goto bad_form;
                }

                if ((utype == V_ASN1_BIT_STRING) && no_unused) {
                        if (!asn1_abs_set_unused_bits(atmp->value.asn1_string,
                            0))
                                goto bad_str;
                }

                break;

        default:
                ASN1error(ASN1_R_UNSUPPORTED_TYPE);
                goto bad_str;
                break;
        }

        atmp->type = utype;
        return atmp;

 bad_str:
        ERR_asprintf_error_data("string=%s", str);
 bad_form:
        ASN1_TYPE_free(atmp);
        return NULL;
}

static int
bitstr_cb(const char *elem, int len, void *bitstr)
{
        long bitnum;
        char *eptr;

        if (!elem)
                return 0;
        bitnum = strtoul(elem, &eptr, 10);
        if (eptr && *eptr && (eptr != elem + len))
                return 0;
        if (bitnum < 0) {
                ASN1error(ASN1_R_INVALID_NUMBER);
                return 0;
        }
        if (!ASN1_BIT_STRING_set_bit(bitstr, bitnum, 1)) {
                ASN1error(ERR_R_MALLOC_FAILURE);
                return 0;
        }
        return 1;
}