/src/openssl/crypto/asn1/tasn_enc.c

Source
/*
 * Copyright 2000-2026 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 <stddef.h>
#include <string.h>
#include "internal/cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include "crypto/asn1.h"
#include "asn1_local.h"

static int asn1_i2d_ex_primitive(const ASN1_VALUE **pval, unsigned char **out,
    const ASN1_ITEM *it, int tag, int aclass);
static int asn1_set_seq_out(STACK_OF(const_ASN1_VALUE) *sk,
    unsigned char **out,
    int skcontlen, const ASN1_ITEM *item,
    int do_sort, int iclass);
static int asn1_template_ex_i2d(const ASN1_VALUE **pval, unsigned char **out,
    const ASN1_TEMPLATE *tt, int tag, int aclass);
static int asn1_item_flags_i2d(const ASN1_VALUE *val, unsigned char **out,
    const ASN1_ITEM *it, int flags);
static int asn1_ex_i2c(const ASN1_VALUE **pval, unsigned char *cout, int *putype,
    const ASN1_ITEM *it);

/*
 * Top level i2d equivalents: the 'ndef' variant instructs the encoder to use
 * indefinite length constructed encoding, where appropriate
 */

int ASN1_item_ndef_i2d(const ASN1_VALUE *val, unsigned char **out,
    const ASN1_ITEM *it)
{
    return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
}

int ASN1_item_i2d(const ASN1_VALUE *val, unsigned char **out, const ASN1_ITEM *it)
{
    return asn1_item_flags_i2d(val, out, it, 0);
}

/*
 * Encode an ASN1 item, this is use by the standard 'i2d' function. 'out'
 * points to a buffer to output the data to. The new i2d has one additional
 * feature. If the output buffer is NULL (i.e. *out == NULL) then a buffer is
 * allocated and populated with the encoding.
 */

static int asn1_item_flags_i2d(const ASN1_VALUE *val, unsigned char **out,
    const ASN1_ITEM *it, int flags)
{
    if (out != NULL && *out == NULL) {
        unsigned char *p, *buf;
        int len, outlen;

        len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
        if (len <= 0)
            return len;
        if ((buf = OPENSSL_malloc(len)) == NULL)
            return -1;
        p = buf;
        outlen = ASN1_item_ex_i2d(&val, &p, it, -1, flags);
        if (outlen != len || p != buf + len) {
            OPENSSL_free(buf);
            return -1;
        }
        *out = buf;
        return len;
    }

    return ASN1_item_ex_i2d(&val, out, it, -1, flags);
}

/*
 * Encode an item, taking care of IMPLICIT tagging (if any). This function
 * performs the normal item handling: it can be used in external types.
 */

int ASN1_item_ex_i2d(const ASN1_VALUE **pval, unsigned char **out,
    const ASN1_ITEM *it, int tag, int aclass)
{
    const ASN1_TEMPLATE *tt = NULL;
    int i, seqcontlen, seqlen, ndef = 1;
    const ASN1_EXTERN_FUNCS *ef;
    const ASN1_AUX *aux = it->funcs;

    if ((it->itype != ASN1_ITYPE_PRIMITIVE) && *pval == NULL)
        return 0;

    switch (it->itype) {

    case ASN1_ITYPE_PRIMITIVE:
        if (it->templates)
            return asn1_template_ex_i2d(pval, out, it->templates,
                tag, aclass);
        return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);

    case ASN1_ITYPE_MSTRING:
        /*
         * It never makes sense for multi-strings to have implicit tagging, so
         * if tag != -1, then this looks like an error in the template.
         */
        if (tag != -1) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
            return -1;
        }
        return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);

    case ASN1_ITYPE_CHOICE:
        /*
         * It never makes sense for CHOICE types to have implicit tagging, so
         * if tag != -1, then this looks like an error in the template.
         */
        if (tag != -1) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
            return -1;
        }
        if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_PRE, pval, it, NULL))
            return 0;
        i = ossl_asn1_get_choice_selector_const(pval, it);
        if ((i >= 0) && (i < it->tcount)) {
            const ASN1_VALUE **pchval;
            const ASN1_TEMPLATE *chtt;
            chtt = it->templates + i;
            pchval = ossl_asn1_get_const_field_ptr(pval, chtt);
            return asn1_template_ex_i2d(pchval, out, chtt, -1, aclass);
        }
        /* Fixme: error condition if selector out of range */
        if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_POST, pval, it, NULL))
            return 0;
        break;

    case ASN1_ITYPE_EXTERN:
        /* If new style i2d it does all the work */
        ef = it->funcs;
        return ef->asn1_ex_i2d(pval, out, it, tag, aclass);

    case ASN1_ITYPE_NDEF_SEQUENCE:
        /* Use indefinite length constructed if requested */
        if (aclass & ASN1_TFLG_NDEF)
            ndef = 2;
        /* fall through */

    case ASN1_ITYPE_SEQUENCE:
        i = ossl_asn1_enc_restore(&seqcontlen, out, pval, it);
        /* An error occurred */
        if (i < 0)
            return 0;
        /* We have a valid cached encoding... */
        if (i > 0)
            return seqcontlen;
        /* Otherwise carry on */
        seqcontlen = 0;
        /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
        if (tag == -1) {
            tag = V_ASN1_SEQUENCE;
            /* Retain any other flags in aclass */
            aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
                | V_ASN1_UNIVERSAL;
        }
        if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_PRE, pval, it, NULL))
            return 0;
        /* First work out sequence content length */
        for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
            const ASN1_TEMPLATE *seqtt;
            const ASN1_VALUE **pseqval;
            int tmplen;
            seqtt = ossl_asn1_do_adb(*pval, tt, 1);
            if (!seqtt)
                return 0;
            pseqval = ossl_asn1_get_const_field_ptr(pval, seqtt);
            tmplen = asn1_template_ex_i2d(pseqval, NULL, seqtt, -1, aclass);
            if (tmplen < 0 || (tmplen > INT_MAX - seqcontlen))
                return -1;
            seqcontlen += tmplen;
        }

        seqlen = ASN1_object_size(ndef, seqcontlen, tag);
        if (!out || seqlen == -1)
            return seqlen;
        /* Output SEQUENCE header */
        ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
        for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
            const ASN1_TEMPLATE *seqtt;
            const ASN1_VALUE **pseqval;
            int tmplen;

            seqtt = ossl_asn1_do_adb(*pval, tt, 1);
            if (!seqtt)
                return 0;
            pseqval = ossl_asn1_get_const_field_ptr(pval, seqtt);
            tmplen = asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
            if (tmplen < 0)
                return -1;
        }
        if (ndef == 2)
            ASN1_put_eoc(out);
        if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_POST, pval, it, NULL))
            return 0;
        return seqlen;

    default:
        return 0;
    }
    return 0;
}

static int asn1_template_ex_i2d(const ASN1_VALUE **pval, unsigned char **out,
    const ASN1_TEMPLATE *tt, int tag, int iclass)
{
    const int flags = tt->flags;
    int i, ret, ttag, tclass, ndef, len;
    const ASN1_VALUE *tval;
    unsigned char *p;

    /*
     * If field is embedded then val needs fixing so it is a pointer to
     * a pointer to a field.
     */
    if (flags & ASN1_TFLG_EMBED) {
        tval = (ASN1_VALUE *)pval;
        pval = &tval;
    }
    /*
     * Work out tag and class to use: tagging may come either from the
     * template or the arguments, not both because this would create
     * ambiguity. Additionally the iclass argument may contain some
     * additional flags which should be noted and passed down to other
     * levels.
     */
    if (flags & ASN1_TFLG_TAG_MASK) {
        /* Error if argument and template tagging */
        if (tag != -1)
            /* FIXME: error code here */
            return -1;
        /* Get tagging from template */
        ttag = tt->tag;
        tclass = flags & ASN1_TFLG_TAG_CLASS;
    } else if (tag != -1) {
        /* No template tagging, get from arguments */
        ttag = tag;
        tclass = iclass & ASN1_TFLG_TAG_CLASS;
    } else {
        ttag = -1;
        tclass = 0;
    }
    /*
     * Remove any class mask from iflag.
     */
    iclass &= ~ASN1_TFLG_TAG_CLASS;

    /*
     * At this point 'ttag' contains the outer tag to use, 'tclass' is the
     * class and iclass is any flags passed to this function.
     */

    /* if template and arguments require ndef, use it */
    if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
        ndef = 2;
    else
        ndef = 1;

    if (flags & ASN1_TFLG_SK_MASK) {
        /* SET OF, SEQUENCE OF */
        STACK_OF(const_ASN1_VALUE) *sk = (STACK_OF(const_ASN1_VALUE) *)*pval;
        int isset, sktag, skaclass;
        int skcontlen, sklen;
        const ASN1_VALUE *skitem;

        if (*pval == NULL)
            return 0;

        if (flags & ASN1_TFLG_SET_OF) {
            isset = 1;
            /* 2 means we reorder */
            if (flags & ASN1_TFLG_SEQUENCE_OF)
                isset = 2;
        } else
            isset = 0;

        /*
         * Work out inner tag value: if EXPLICIT or no tagging use underlying
         * type.
         */
        if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) {
            sktag = ttag;
            skaclass = tclass;
        } else {
            skaclass = V_ASN1_UNIVERSAL;
            if (isset)
                sktag = V_ASN1_SET;
            else
                sktag = V_ASN1_SEQUENCE;
        }

        /* Determine total length of items */
        skcontlen = 0;
        for (i = 0; i < sk_const_ASN1_VALUE_num(sk); i++) {
            skitem = sk_const_ASN1_VALUE_value(sk, i);
            len = ASN1_item_ex_i2d(&skitem, NULL, ASN1_ITEM_ptr(tt->item),
                -1, iclass);
            if (len < 0 || (skcontlen > INT_MAX - len))
                return -1;
            if (len == 0 && (tt->flags & ASN1_TFLG_OPTIONAL) == 0) {
                ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_ZERO_CONTENT);
                return -1;
            }
            skcontlen += len;
        }
        sklen = ASN1_object_size(ndef, skcontlen, sktag);
        if (sklen == -1)
            return -1;
        /* If EXPLICIT need length of surrounding tag */
        if (flags & ASN1_TFLG_EXPTAG)
            ret = ASN1_object_size(ndef, sklen, ttag);
        else
            ret = sklen;

        if (!out || ret == -1)
            return ret;

        /* Now encode this lot... */
        /* EXPLICIT tag */
        if (flags & ASN1_TFLG_EXPTAG)
            ASN1_put_object(out, ndef, sklen, ttag, tclass);
        /* SET or SEQUENCE and IMPLICIT tag */
        ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
        /* And the stuff itself */
        if (!asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
                isset, iclass))
            return -1;
        if (ndef == 2) {
            ASN1_put_eoc(out);
            if (flags & ASN1_TFLG_EXPTAG)
                ASN1_put_eoc(out);
        }

        return ret;
    }

    if (flags & ASN1_TFLG_EXPTAG) {
        /* EXPLICIT tagging */
        /* Find length of tagged item */
        i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, iclass);
        if (i < 0)
            return -1;
        if (i == 0) {
            if ((tt->flags & ASN1_TFLG_OPTIONAL) == 0) {
                ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_ZERO_CONTENT);
                return -1;
            }
            return 0;
        }
        /* Find length of EXPLICIT tag */
        ret = ASN1_object_size(ndef, i, ttag);
        if (out && ret != -1) {
            /* Output tag and item */
            ASN1_put_object(out, ndef, i, ttag, tclass);
            p = *out;
            len = ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1,
                iclass);
            if (len != i || *out != p + i)
                return -1;
            if (ndef == 2)
                ASN1_put_eoc(out);
        }
        return ret;
    }

    /* Either normal or IMPLICIT tagging: combine class and flags */
    len = ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
        ttag, tclass | iclass);
    if (len == 0 && (tt->flags & ASN1_TFLG_OPTIONAL) == 0) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_ZERO_CONTENT);
        return -1;
    }
    return len;
}

/* Temporary structure used to hold DER encoding of items for SET OF */

typedef struct {
    unsigned char *data;
    int length;
    const ASN1_VALUE *field;
} DER_ENC;

static int der_cmp(const void *a, const void *b)
{
    const DER_ENC *d1 = a, *d2 = b;
    int cmplen, i;
    cmplen = (d1->length < d2->length) ? d1->length : d2->length;
    i = memcmp(d1->data, d2->data, cmplen);
    if (i)
        return i;
    return d1->length - d2->length;
}

/* Output the content octets of SET OF or SEQUENCE OF */

static int asn1_set_seq_out(STACK_OF(const_ASN1_VALUE) *sk,
    unsigned char **out,
    int skcontlen, const ASN1_ITEM *item,
    int do_sort, int iclass)
{
    int i, ret = 0;
    const ASN1_VALUE *skitem;
    unsigned char *tmpdat = NULL, *p = NULL;
    DER_ENC *derlst = NULL, *tder;

    if (do_sort) {
        /* Don't need to sort less than 2 items */
        if (sk_const_ASN1_VALUE_num(sk) < 2)
            do_sort = 0;
        else {
            derlst = OPENSSL_malloc(sk_const_ASN1_VALUE_num(sk)
                * sizeof(*derlst));
            if (derlst == NULL)
                return 0;
            tmpdat = OPENSSL_malloc(skcontlen);
            if (tmpdat == NULL)
                goto err;
        }
    }
    /* If not sorting just output each item */
    if (!do_sort) {
        for (i = 0; i < sk_const_ASN1_VALUE_num(sk); i++) {
            skitem = sk_const_ASN1_VALUE_value(sk, i);
            if (ASN1_item_ex_i2d(&skitem, out, item, -1, iclass) <= 0)
                return 0;
        }
        return 1;
    }
    p = tmpdat;

    /* Doing sort: build up a list of each member's DER encoding */
    for (i = 0, tder = derlst; i < sk_const_ASN1_VALUE_num(sk); i++, tder++) {
        skitem = sk_const_ASN1_VALUE_value(sk, i);
        tder->data = p;
        tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
        if (tder->length <= 0)
            goto err;
        tder->field = skitem;
    }

    /* Now sort them */
    qsort(derlst, sk_const_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
    /* Output sorted DER encoding */
    p = *out;
    for (i = 0, tder = derlst; i < sk_const_ASN1_VALUE_num(sk); i++, tder++) {
        memcpy(p, tder->data, tder->length);
        p += tder->length;
    }
    *out = p;
    /* If do_sort is 2 then reorder the STACK */
    if (do_sort == 2) {
        for (i = 0, tder = derlst; i < sk_const_ASN1_VALUE_num(sk); i++, tder++)
            (void)sk_const_ASN1_VALUE_set(sk, i, tder->field);
    }
    ret = 1;
err:
    OPENSSL_free(derlst);
    OPENSSL_free(tmpdat);
    return ret;
}

static int asn1_i2d_ex_primitive(const ASN1_VALUE **pval, unsigned char **out,
    const ASN1_ITEM *it, int tag, int aclass)
{
    int len;
    int utype;
    int usetag;
    int ndef = 0;

    utype = it->utype;

    /*
     * Get length of content octets and maybe find out the underlying type.
     */

    len = asn1_ex_i2c(pval, NULL, &utype, it);

    /*
     * If SEQUENCE, SET or OTHER then header is included in pseudo content
     * octets so don't include tag+length. We need to check here because the
     * call to asn1_ex_i2c() could change utype.
     */
    if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))
        usetag = 0;
    else
        usetag = 1;

    /* -1 means omit type */

    if (len == -1)
        return 0;

    /* -2 return is special meaning use ndef */
    if (len == -2) {
        ndef = 2;
        len = 0;
    }

    /* If not implicitly tagged get tag from underlying type */
    if (tag == -1)
        tag = utype;

    /* Output tag+length followed by content octets */
    if (out) {
        if (usetag)
            ASN1_put_object(out, ndef, len, tag, aclass);
        asn1_ex_i2c(pval, *out, &utype, it);
        if (ndef)
            ASN1_put_eoc(out);
        else
            *out += len;
    }

    if (usetag)
        return ASN1_object_size(ndef, len, tag);
    return len;
}

/* Produce content octets from a structure */

static int asn1_ex_i2c(const ASN1_VALUE **pval, unsigned char *cout, int *putype,
    const ASN1_ITEM *it)
{
    ASN1_BOOLEAN *tbool = NULL;
    ASN1_STRING *strtmp;
    ASN1_OBJECT *otmp;
    int utype;
    const unsigned char *cont;
    unsigned char c;
    int len;
    const ASN1_PRIMITIVE_FUNCS *pf;
    pf = it->funcs;
    if (pf && pf->prim_i2c)
        return pf->prim_i2c(pval, cout, putype, it);

    /* Should type be omitted? */
    if ((it->itype != ASN1_ITYPE_PRIMITIVE)
        || (it->utype != V_ASN1_BOOLEAN)) {
        if (*pval == NULL)
            return -1;
    }

    if (it->itype == ASN1_ITYPE_MSTRING) {
        /* If MSTRING type set the underlying type */
        strtmp = (ASN1_STRING *)*pval;
        utype = strtmp->type;
        *putype = utype;
    } else if (it->utype == V_ASN1_ANY) {
        /* If ANY set type and pointer to value */
        ASN1_TYPE *typ;
        typ = (ASN1_TYPE *)*pval;
        utype = typ->type;
        *putype = utype;
        pval = (const ASN1_VALUE **)&typ->value.asn1_value; /* actually is const */
    } else
        utype = *putype;

    switch (utype) {
    case V_ASN1_OBJECT:
        otmp = (ASN1_OBJECT *)*pval;
        cont = otmp->data;
        len = otmp->length;
        if (cont == NULL || len == 0)
            return -1;
        break;

    case V_ASN1_UNDEF:
        return -2;

    case V_ASN1_NULL:
        cont = NULL;
        len = 0;
        break;

    case V_ASN1_BOOLEAN:
        tbool = (ASN1_BOOLEAN *)pval;
        if (*tbool == -1)
            return -1;
        if (it->utype != V_ASN1_ANY) {
            /*
             * Default handling if value == size field then omit
             */
            if (*tbool && (it->size > 0))
                return -1;
            if (!*tbool && !it->size)
                return -1;
        }
        c = (unsigned char)*tbool;
        cont = &c;
        len = 1;
        break;

    case V_ASN1_BIT_STRING:
        return ossl_i2c_ASN1_BIT_STRING((const ASN1_BIT_STRING *)*pval,
            cout ? &cout : NULL);

    case V_ASN1_INTEGER:
    case V_ASN1_ENUMERATED:
        /*
         * These are all have the same content format as ASN1_INTEGER
         */
        return ossl_i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval, cout ? &cout : NULL);

    case V_ASN1_OCTET_STRING:
    case V_ASN1_NUMERICSTRING:
    case V_ASN1_PRINTABLESTRING:
    case V_ASN1_T61STRING:
    case V_ASN1_VIDEOTEXSTRING:
    case V_ASN1_IA5STRING:
    case V_ASN1_UTCTIME:
    case V_ASN1_GENERALIZEDTIME:
    case V_ASN1_GRAPHICSTRING:
    case V_ASN1_VISIBLESTRING:
    case V_ASN1_GENERALSTRING:
    case V_ASN1_UNIVERSALSTRING:
    case V_ASN1_BMPSTRING:
    case V_ASN1_UTF8STRING:
    case V_ASN1_SEQUENCE:
    case V_ASN1_SET:
    default:
        /* All based on ASN1_STRING and handled the same */
        strtmp = (ASN1_STRING *)*pval;
        /* Special handling for NDEF */
        if ((it->size == ASN1_TFLG_NDEF)
            && (strtmp->flags & ASN1_STRING_FLAG_NDEF)) {
            if (cout) {
                strtmp->data = cout;
                strtmp->length = 0;
            }
            /* Special return code */
            return -2;
        }
        cont = strtmp->data;
        len = strtmp->length;

        break;
    }
    if (cout && len)
        memcpy(cout, cont, len);
    return len;
}

Coverage Report

Created: 2026-09-17 06:47

Line	Count	Source
1		/*
2		* Copyright 2000-2026 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include <stddef.h>
11		#include <string.h>
12		#include "internal/cryptlib.h"
13		#include <openssl/asn1.h>
14		#include <openssl/asn1t.h>
15		#include <openssl/objects.h>
16		#include "crypto/asn1.h"
17		#include "asn1_local.h"
18
19		static int asn1_i2d_ex_primitive(const ASN1_VALUE pval, unsigned char out,
20		const ASN1_ITEM *it, int tag, int aclass);
21		static int asn1_set_seq_out(STACK_OF(const_ASN1_VALUE) *sk,
22		unsigned char **out,
23		int skcontlen, const ASN1_ITEM *item,
24		int do_sort, int iclass);
25		static int asn1_template_ex_i2d(const ASN1_VALUE pval, unsigned char out,
26		const ASN1_TEMPLATE *tt, int tag, int aclass);
27		static int asn1_item_flags_i2d(const ASN1_VALUE val, unsigned char *out,
28		const ASN1_ITEM *it, int flags);
29		static int asn1_ex_i2c(const ASN1_VALUE *pval, unsigned char cout, int *putype,
30		const ASN1_ITEM *it);
31
32		/*
33		* Top level i2d equivalents: the 'ndef' variant instructs the encoder to use
34		* indefinite length constructed encoding, where appropriate
35		*/
36
37		int ASN1_item_ndef_i2d(const ASN1_VALUE val, unsigned char *out,
38		const ASN1_ITEM *it)
39	0	{
40	0	return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
41	0	}
42
43		int ASN1_item_i2d(const ASN1_VALUE val, unsigned char out, const ASN1_ITEM it)
44	5.58k	{
45	5.58k	return asn1_item_flags_i2d(val, out, it, 0);
46	5.58k	}
47
48		/*
49		* Encode an ASN1 item, this is use by the standard 'i2d' function. 'out'
50		* points to a buffer to output the data to. The new i2d has one additional
51		* feature. If the output buffer is NULL (i.e. *out == NULL) then a buffer is
52		* allocated and populated with the encoding.
53		*/
54
55		static int asn1_item_flags_i2d(const ASN1_VALUE val, unsigned char *out,
56		const ASN1_ITEM *it, int flags)
57	5.58k	{
58	5.58k	if (out != NULL && *out == NULL) {
59	5.58k	unsigned char p, buf;
60	5.58k	int len, outlen;
61
62	5.58k	len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
63	5.58k	if (len <= 0)
64	0	return len;
65	5.58k	if ((buf = OPENSSL_malloc(len)) == NULL)
66	0	return -1;
67	5.58k	p = buf;
68	5.58k	outlen = ASN1_item_ex_i2d(&val, &p, it, -1, flags);
69	5.58k	if (outlen != len \|\| p != buf + len) {
70	0	OPENSSL_free(buf);
71	0	return -1;
72	0	}
73	5.58k	*out = buf;
74	5.58k	return len;
75	5.58k	}
76
77	0	return ASN1_item_ex_i2d(&val, out, it, -1, flags);
78	5.58k	}
79
80		/*
81		* Encode an item, taking care of IMPLICIT tagging (if any). This function
82		* performs the normal item handling: it can be used in external types.
83		*/
84
85		int ASN1_item_ex_i2d(const ASN1_VALUE pval, unsigned char out,
86		const ASN1_ITEM *it, int tag, int aclass)
87	44.6k	{
88	44.6k	const ASN1_TEMPLATE *tt = NULL;
89	44.6k	int i, seqcontlen, seqlen, ndef = 1;
90	44.6k	const ASN1_EXTERN_FUNCS *ef;
91	44.6k	const ASN1_AUX *aux = it->funcs;
92
93	44.6k	if ((it->itype != ASN1_ITYPE_PRIMITIVE) && *pval == NULL)
94	0	return 0;
95
96	44.6k	switch (it->itype) {
97
98	33.5k	case ASN1_ITYPE_PRIMITIVE:
99	33.5k	if (it->templates)
100	0	return asn1_template_ex_i2d(pval, out, it->templates,
101	0	tag, aclass);
102	33.5k	return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
103
104	0	case ASN1_ITYPE_MSTRING:
105		/*
106		* It never makes sense for multi-strings to have implicit tagging, so
107		* if tag != -1, then this looks like an error in the template.
108		*/
109	0	if (tag != -1) {
110	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
111	0	return -1;
112	0	}
113	0	return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
114
115	0	case ASN1_ITYPE_CHOICE:
116		/*
117		* It never makes sense for CHOICE types to have implicit tagging, so
118		* if tag != -1, then this looks like an error in the template.
119		*/
120	0	if (tag != -1) {
121	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE);
122	0	return -1;
123	0	}
124	0	if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_PRE, pval, it, NULL))
125	0	return 0;
126	0	i = ossl_asn1_get_choice_selector_const(pval, it);
127	0	if ((i >= 0) && (i < it->tcount)) {
128	0	const ASN1_VALUE **pchval;
129	0	const ASN1_TEMPLATE *chtt;
130	0	chtt = it->templates + i;
131	0	pchval = ossl_asn1_get_const_field_ptr(pval, chtt);
132	0	return asn1_template_ex_i2d(pchval, out, chtt, -1, aclass);
133	0	}
134		/* Fixme: error condition if selector out of range */
135	0	if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_POST, pval, it, NULL))
136	0	return 0;
137	0	break;
138
139	0	case ASN1_ITYPE_EXTERN:
140		/* If new style i2d it does all the work */
141	0	ef = it->funcs;
142	0	return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
143
144	0	case ASN1_ITYPE_NDEF_SEQUENCE:
145		/* Use indefinite length constructed if requested */
146	0	if (aclass & ASN1_TFLG_NDEF)
147	0	ndef = 2;
148		/* fall through */
149
150	11.1k	case ASN1_ITYPE_SEQUENCE:
151	11.1k	i = ossl_asn1_enc_restore(&seqcontlen, out, pval, it);
152		/* An error occurred */
153	11.1k	if (i < 0)
154	0	return 0;
155		/* We have a valid cached encoding... */
156	11.1k	if (i > 0)
157	0	return seqcontlen;
158		/* Otherwise carry on */
159	11.1k	seqcontlen = 0;
160		/* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
161	11.1k	if (tag == -1) {
162	11.1k	tag = V_ASN1_SEQUENCE;
163		/* Retain any other flags in aclass */
164	11.1k	aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
165	11.1k	\| V_ASN1_UNIVERSAL;
166	11.1k	}
167	11.1k	if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_PRE, pval, it, NULL))
168	0	return 0;
169		/* First work out sequence content length */
170	33.5k	for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
171	22.3k	const ASN1_TEMPLATE *seqtt;
172	22.3k	const ASN1_VALUE **pseqval;
173	22.3k	int tmplen;
174	22.3k	seqtt = ossl_asn1_do_adb(*pval, tt, 1);
175	22.3k	if (!seqtt)
176	0	return 0;
177	22.3k	pseqval = ossl_asn1_get_const_field_ptr(pval, seqtt);
178	22.3k	tmplen = asn1_template_ex_i2d(pseqval, NULL, seqtt, -1, aclass);
179	22.3k	if (tmplen < 0 \|\| (tmplen > INT_MAX - seqcontlen))
180	0	return -1;
181	22.3k	seqcontlen += tmplen;
182	22.3k	}
183
184	11.1k	seqlen = ASN1_object_size(ndef, seqcontlen, tag);
185	11.1k	if (!out \|\| seqlen == -1)
186	5.58k	return seqlen;
187		/* Output SEQUENCE header */
188	5.58k	ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
189	16.7k	for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
190	11.1k	const ASN1_TEMPLATE *seqtt;
191	11.1k	const ASN1_VALUE **pseqval;
192	11.1k	int tmplen;
193
194	11.1k	seqtt = ossl_asn1_do_adb(*pval, tt, 1);
195	11.1k	if (!seqtt)
196	0	return 0;
197	11.1k	pseqval = ossl_asn1_get_const_field_ptr(pval, seqtt);
198	11.1k	tmplen = asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
199	11.1k	if (tmplen < 0)
200	0	return -1;
201	11.1k	}
202	5.58k	if (ndef == 2)
203	0	ASN1_put_eoc(out);
204	5.58k	if (!ossl_asn1_call_aux_cb(aux, ASN1_OP_I2D_POST, pval, it, NULL))
205	0	return 0;
206	5.58k	return seqlen;
207
208	0	default:
209	0	return 0;
210	44.6k	}
211	0	return 0;
212	44.6k	}
213
214		static int asn1_template_ex_i2d(const ASN1_VALUE pval, unsigned char out,
215		const ASN1_TEMPLATE *tt, int tag, int iclass)
216	33.5k	{
217	33.5k	const int flags = tt->flags;
218	33.5k	int i, ret, ttag, tclass, ndef, len;
219	33.5k	const ASN1_VALUE *tval;
220	33.5k	unsigned char *p;
221
222		/*
223		* If field is embedded then val needs fixing so it is a pointer to
224		* a pointer to a field.
225		*/
226	33.5k	if (flags & ASN1_TFLG_EMBED) {
227	0	tval = (ASN1_VALUE *)pval;
228	0	pval = &tval;
229	0	}
230		/*
231		* Work out tag and class to use: tagging may come either from the
232		* template or the arguments, not both because this would create
233		* ambiguity. Additionally the iclass argument may contain some
234		* additional flags which should be noted and passed down to other
235		* levels.
236		*/
237	33.5k	if (flags & ASN1_TFLG_TAG_MASK) {
238		/* Error if argument and template tagging */
239	0	if (tag != -1)
240		/* FIXME: error code here */
241	0	return -1;
242		/* Get tagging from template */
243	0	ttag = tt->tag;
244	0	tclass = flags & ASN1_TFLG_TAG_CLASS;
245	33.5k	} else if (tag != -1) {
246		/* No template tagging, get from arguments */
247	0	ttag = tag;
248	0	tclass = iclass & ASN1_TFLG_TAG_CLASS;
249	33.5k	} else {
250	33.5k	ttag = -1;
251	33.5k	tclass = 0;
252	33.5k	}
253		/*
254		* Remove any class mask from iflag.
255		*/
256	33.5k	iclass &= ~ASN1_TFLG_TAG_CLASS;
257
258		/*
259		* At this point 'ttag' contains the outer tag to use, 'tclass' is the
260		* class and iclass is any flags passed to this function.
261		*/
262
263		/* if template and arguments require ndef, use it */
264	33.5k	if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
265	0	ndef = 2;
266	33.5k	else
267	33.5k	ndef = 1;
268
269	33.5k	if (flags & ASN1_TFLG_SK_MASK) {
270		/* SET OF, SEQUENCE OF */
271	0	STACK_OF(const_ASN1_VALUE) sk = (STACK_OF(const_ASN1_VALUE) )*pval;
272	0	int isset, sktag, skaclass;
273	0	int skcontlen, sklen;
274	0	const ASN1_VALUE *skitem;
275
276	0	if (*pval == NULL)
277	0	return 0;
278
279	0	if (flags & ASN1_TFLG_SET_OF) {
280	0	isset = 1;
281		/* 2 means we reorder */
282	0	if (flags & ASN1_TFLG_SEQUENCE_OF)
283	0	isset = 2;
284	0	} else
285	0	isset = 0;
286
287		/*
288		* Work out inner tag value: if EXPLICIT or no tagging use underlying
289		* type.
290		*/
291	0	if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) {
292	0	sktag = ttag;
293	0	skaclass = tclass;
294	0	} else {
295	0	skaclass = V_ASN1_UNIVERSAL;
296	0	if (isset)
297	0	sktag = V_ASN1_SET;
298	0	else
299	0	sktag = V_ASN1_SEQUENCE;
300	0	}
301
302		/* Determine total length of items */
303	0	skcontlen = 0;
304	0	for (i = 0; i < sk_const_ASN1_VALUE_num(sk); i++) {
305	0	skitem = sk_const_ASN1_VALUE_value(sk, i);
306	0	len = ASN1_item_ex_i2d(&skitem, NULL, ASN1_ITEM_ptr(tt->item),
307	0	-1, iclass);
308	0	if (len < 0 \|\| (skcontlen > INT_MAX - len))
309	0	return -1;
310	0	if (len == 0 && (tt->flags & ASN1_TFLG_OPTIONAL) == 0) {
311	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_ZERO_CONTENT);
312	0	return -1;
313	0	}
314	0	skcontlen += len;
315	0	}
316	0	sklen = ASN1_object_size(ndef, skcontlen, sktag);
317	0	if (sklen == -1)
318	0	return -1;
319		/* If EXPLICIT need length of surrounding tag */
320	0	if (flags & ASN1_TFLG_EXPTAG)
321	0	ret = ASN1_object_size(ndef, sklen, ttag);
322	0	else
323	0	ret = sklen;
324
325	0	if (!out \|\| ret == -1)
326	0	return ret;
327
328		/* Now encode this lot... */
329		/* EXPLICIT tag */
330	0	if (flags & ASN1_TFLG_EXPTAG)
331	0	ASN1_put_object(out, ndef, sklen, ttag, tclass);
332		/* SET or SEQUENCE and IMPLICIT tag */
333	0	ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
334		/* And the stuff itself */
335	0	if (!asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
336	0	isset, iclass))
337	0	return -1;
338	0	if (ndef == 2) {
339	0	ASN1_put_eoc(out);
340	0	if (flags & ASN1_TFLG_EXPTAG)
341	0	ASN1_put_eoc(out);
342	0	}
343
344	0	return ret;
345	0	}
346
347	33.5k	if (flags & ASN1_TFLG_EXPTAG) {
348		/* EXPLICIT tagging */
349		/* Find length of tagged item */
350	0	i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, iclass);
351	0	if (i < 0)
352	0	return -1;
353	0	if (i == 0) {
354	0	if ((tt->flags & ASN1_TFLG_OPTIONAL) == 0) {
355	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_ZERO_CONTENT);
356	0	return -1;
357	0	}
358	0	return 0;
359	0	}
360		/* Find length of EXPLICIT tag */
361	0	ret = ASN1_object_size(ndef, i, ttag);
362	0	if (out && ret != -1) {
363		/* Output tag and item */
364	0	ASN1_put_object(out, ndef, i, ttag, tclass);
365	0	p = *out;
366	0	len = ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1,
367	0	iclass);
368	0	if (len != i \|\| *out != p + i)
369	0	return -1;
370	0	if (ndef == 2)
371	0	ASN1_put_eoc(out);
372	0	}
373	0	return ret;
374	0	}
375
376		/* Either normal or IMPLICIT tagging: combine class and flags */
377	33.5k	len = ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
378	33.5k	ttag, tclass \| iclass);
379	33.5k	if (len == 0 && (tt->flags & ASN1_TFLG_OPTIONAL) == 0) {
380	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_ZERO_CONTENT);
381	0	return -1;
382	0	}
383	33.5k	return len;
384	33.5k	}
385
386		/* Temporary structure used to hold DER encoding of items for SET OF */
387
388		typedef struct {
389		unsigned char *data;
390		int length;
391		const ASN1_VALUE *field;
392		} DER_ENC;
393
394		static int der_cmp(const void a, const void b)
395	0	{
396	0	const DER_ENC d1 = a, d2 = b;
397	0	int cmplen, i;
398	0	cmplen = (d1->length < d2->length) ? d1->length : d2->length;
399	0	i = memcmp(d1->data, d2->data, cmplen);
400	0	if (i)
401	0	return i;
402	0	return d1->length - d2->length;
403	0	}
404
405		/* Output the content octets of SET OF or SEQUENCE OF */
406
407		static int asn1_set_seq_out(STACK_OF(const_ASN1_VALUE) *sk,
408		unsigned char **out,
409		int skcontlen, const ASN1_ITEM *item,
410		int do_sort, int iclass)
411	0	{
412	0	int i, ret = 0;
413	0	const ASN1_VALUE *skitem;
414	0	unsigned char tmpdat = NULL, p = NULL;
415	0	DER_ENC derlst = NULL, tder;
416
417	0	if (do_sort) {
418		/* Don't need to sort less than 2 items */
419	0	if (sk_const_ASN1_VALUE_num(sk) < 2)
420	0	do_sort = 0;
421	0	else {
422	0	derlst = OPENSSL_malloc(sk_const_ASN1_VALUE_num(sk)
423	0	* sizeof(*derlst));
424	0	if (derlst == NULL)
425	0	return 0;
426	0	tmpdat = OPENSSL_malloc(skcontlen);
427	0	if (tmpdat == NULL)
428	0	goto err;
429	0	}
430	0	}
431		/* If not sorting just output each item */
432	0	if (!do_sort) {
433	0	for (i = 0; i < sk_const_ASN1_VALUE_num(sk); i++) {
434	0	skitem = sk_const_ASN1_VALUE_value(sk, i);
435	0	if (ASN1_item_ex_i2d(&skitem, out, item, -1, iclass) <= 0)
436	0	return 0;
437	0	}
438	0	return 1;
439	0	}
440	0	p = tmpdat;
441
442		/* Doing sort: build up a list of each member's DER encoding */
443	0	for (i = 0, tder = derlst; i < sk_const_ASN1_VALUE_num(sk); i++, tder++) {
444	0	skitem = sk_const_ASN1_VALUE_value(sk, i);
445	0	tder->data = p;
446	0	tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
447	0	if (tder->length <= 0)
448	0	goto err;
449	0	tder->field = skitem;
450	0	}
451
452		/* Now sort them */
453	0	qsort(derlst, sk_const_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
454		/* Output sorted DER encoding */
455	0	p = *out;
456	0	for (i = 0, tder = derlst; i < sk_const_ASN1_VALUE_num(sk); i++, tder++) {
457	0	memcpy(p, tder->data, tder->length);
458	0	p += tder->length;
459	0	}
460	0	*out = p;
461		/* If do_sort is 2 then reorder the STACK */
462	0	if (do_sort == 2) {
463	0	for (i = 0, tder = derlst; i < sk_const_ASN1_VALUE_num(sk); i++, tder++)
464	0	(void)sk_const_ASN1_VALUE_set(sk, i, tder->field);
465	0	}
466	0	ret = 1;
467	0	err:
468	0	OPENSSL_free(derlst);
469	0	OPENSSL_free(tmpdat);
470	0	return ret;
471	0	}
472
473		static int asn1_i2d_ex_primitive(const ASN1_VALUE pval, unsigned char out,
474		const ASN1_ITEM *it, int tag, int aclass)
475	33.5k	{
476	33.5k	int len;
477	33.5k	int utype;
478	33.5k	int usetag;
479	33.5k	int ndef = 0;
480
481	33.5k	utype = it->utype;
482
483		/*
484		* Get length of content octets and maybe find out the underlying type.
485		*/
486
487	33.5k	len = asn1_ex_i2c(pval, NULL, &utype, it);
488
489		/*
490		* If SEQUENCE, SET or OTHER then header is included in pseudo content
491		* octets so don't include tag+length. We need to check here because the
492		* call to asn1_ex_i2c() could change utype.
493		*/
494	33.5k	if ((utype == V_ASN1_SEQUENCE) \|\| (utype == V_ASN1_SET) \|\| (utype == V_ASN1_OTHER))
495	0	usetag = 0;
496	33.5k	else
497	33.5k	usetag = 1;
498
499		/* -1 means omit type */
500
501	33.5k	if (len == -1)
502	0	return 0;
503
504		/* -2 return is special meaning use ndef */
505	33.5k	if (len == -2) {
506	0	ndef = 2;
507	0	len = 0;
508	0	}
509
510		/* If not implicitly tagged get tag from underlying type */
511	33.5k	if (tag == -1)
512	33.5k	tag = utype;
513
514		/* Output tag+length followed by content octets */
515	33.5k	if (out) {
516	11.1k	if (usetag)
517	11.1k	ASN1_put_object(out, ndef, len, tag, aclass);
518	11.1k	asn1_ex_i2c(pval, *out, &utype, it);
519	11.1k	if (ndef)
520	0	ASN1_put_eoc(out);
521	11.1k	else
522	11.1k	*out += len;
523	11.1k	}
524
525	33.5k	if (usetag)
526	33.5k	return ASN1_object_size(ndef, len, tag);
527	0	return len;
528	33.5k	}
529
530		/* Produce content octets from a structure */
531
532		static int asn1_ex_i2c(const ASN1_VALUE *pval, unsigned char cout, int *putype,
533		const ASN1_ITEM *it)
534	44.6k	{
535	44.6k	ASN1_BOOLEAN *tbool = NULL;
536	44.6k	ASN1_STRING *strtmp;
537	44.6k	ASN1_OBJECT *otmp;
538	44.6k	int utype;
539	44.6k	const unsigned char *cont;
540	44.6k	unsigned char c;
541	44.6k	int len;
542	44.6k	const ASN1_PRIMITIVE_FUNCS *pf;
543	44.6k	pf = it->funcs;
544	44.6k	if (pf && pf->prim_i2c)
545	44.6k	return pf->prim_i2c(pval, cout, putype, it);
546
547		/* Should type be omitted? */
548	0	if ((it->itype != ASN1_ITYPE_PRIMITIVE)
549	0	\|\| (it->utype != V_ASN1_BOOLEAN)) {
550	0	if (*pval == NULL)
551	0	return -1;
552	0	}
553
554	0	if (it->itype == ASN1_ITYPE_MSTRING) {
555		/* If MSTRING type set the underlying type */
556	0	strtmp = (ASN1_STRING )pval;
557	0	utype = strtmp->type;
558	0	*putype = utype;
559	0	} else if (it->utype == V_ASN1_ANY) {
560		/* If ANY set type and pointer to value */
561	0	ASN1_TYPE *typ;
562	0	typ = (ASN1_TYPE )pval;
563	0	utype = typ->type;
564	0	*putype = utype;
565	0	pval = (const ASN1_VALUE *)&typ->value.asn1_value; / actually is const */
566	0	} else
567	0	utype = *putype;
568
569	0	switch (utype) {
570	0	case V_ASN1_OBJECT:
571	0	otmp = (ASN1_OBJECT )pval;
572	0	cont = otmp->data;
573	0	len = otmp->length;
574	0	if (cont == NULL \|\| len == 0)
575	0	return -1;
576	0	break;
577
578	0	case V_ASN1_UNDEF:
579	0	return -2;
580
581	0	case V_ASN1_NULL:
582	0	cont = NULL;
583	0	len = 0;
584	0	break;
585
586	0	case V_ASN1_BOOLEAN:
587	0	tbool = (ASN1_BOOLEAN *)pval;
588	0	if (*tbool == -1)
589	0	return -1;
590	0	if (it->utype != V_ASN1_ANY) {
591		/*
592		* Default handling if value == size field then omit
593		*/
594	0	if (*tbool && (it->size > 0))
595	0	return -1;
596	0	if (!*tbool && !it->size)
597	0	return -1;
598	0	}
599	0	c = (unsigned char)*tbool;
600	0	cont = &c;
601	0	len = 1;
602	0	break;
603
604	0	case V_ASN1_BIT_STRING:
605	0	return ossl_i2c_ASN1_BIT_STRING((const ASN1_BIT_STRING )pval,
606	0	cout ? &cout : NULL);
607
608	0	case V_ASN1_INTEGER:
609	0	case V_ASN1_ENUMERATED:
610		/*
611		* These are all have the same content format as ASN1_INTEGER
612		*/
613	0	return ossl_i2c_ASN1_INTEGER((ASN1_INTEGER )pval, cout ? &cout : NULL);
614
615	0	case V_ASN1_OCTET_STRING:
616	0	case V_ASN1_NUMERICSTRING:
617	0	case V_ASN1_PRINTABLESTRING:
618	0	case V_ASN1_T61STRING:
619	0	case V_ASN1_VIDEOTEXSTRING:
620	0	case V_ASN1_IA5STRING:
621	0	case V_ASN1_UTCTIME:
622	0	case V_ASN1_GENERALIZEDTIME:
623	0	case V_ASN1_GRAPHICSTRING:
624	0	case V_ASN1_VISIBLESTRING:
625	0	case V_ASN1_GENERALSTRING:
626	0	case V_ASN1_UNIVERSALSTRING:
627	0	case V_ASN1_BMPSTRING:
628	0	case V_ASN1_UTF8STRING:
629	0	case V_ASN1_SEQUENCE:
630	0	case V_ASN1_SET:
631	0	default:
632		/* All based on ASN1_STRING and handled the same */
633	0	strtmp = (ASN1_STRING )pval;
634		/* Special handling for NDEF */
635	0	if ((it->size == ASN1_TFLG_NDEF)
636	0	&& (strtmp->flags & ASN1_STRING_FLAG_NDEF)) {
637	0	if (cout) {
638	0	strtmp->data = cout;
639	0	strtmp->length = 0;
640	0	}
641		/* Special return code */
642	0	return -2;
643	0	}
644	0	cont = strtmp->data;
645	0	len = strtmp->length;
646
647	0	break;
648	0	}
649	0	if (cout && len)
650	0	memcpy(cout, cont, len);
651	0	return len;
652	0	}