[thirdparty/openssl.git] / crypto / asn1 / tasn_enc.c

/* tasn_enc.c */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 2000.
 */
/* ====================================================================
 * Copyright (c) 2000-2004 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 <stddef.h>
#include <string.h>
#include "internal/cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include "internal/asn1_int.h"
#include "asn1_locl.h"

static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
                                 const ASN1_ITEM *it, int tag, int aclass);
static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
                            int skcontlen, const ASN1_ITEM *item,
                            int do_sort, int iclass);
static int asn1_template_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
                                const ASN1_TEMPLATE *tt, int tag, int aclass);
static int asn1_item_flags_i2d(ASN1_VALUE *val, unsigned char **out,
                               const ASN1_ITEM *it, int flags);
static int asn1_ex_i2c(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(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(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(ASN1_VALUE *val, unsigned char **out,
                               const ASN1_ITEM *it, int flags)
{
    if (out && !*out) {
        unsigned char *p, *buf;
        int len;
        len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
        if (len <= 0)
            return len;
        buf = OPENSSL_malloc(len);
        if (!buf)
            return -1;
        p = buf;
        ASN1_item_ex_i2d(&val, &p, it, -1, flags);
        *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(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;
    ASN1_aux_cb *asn1_cb = 0;

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

    if (aux && aux->asn1_cb)
        asn1_cb = aux->asn1_cb;

    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:
        return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);

    case ASN1_ITYPE_CHOICE:
        if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
            return 0;
        i = asn1_get_choice_selector(pval, it);
        if ((i >= 0) && (i < it->tcount)) {
            ASN1_VALUE **pchval;
            const ASN1_TEMPLATE *chtt;
            chtt = it->templates + i;
            pchval = asn1_get_field_ptr(pval, chtt);
            return asn1_template_ex_i2d(pchval, out, chtt, -1, aclass);
        }
        /* Fixme: error condition if selector out of range */
        if (asn1_cb && !asn1_cb(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 = 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 (asn1_cb && !asn1_cb(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;
            ASN1_VALUE **pseqval;
            seqtt = asn1_do_adb(pval, tt, 1);
            if (!seqtt)
                return 0;
            pseqval = asn1_get_field_ptr(pval, seqtt);
            /* FIXME: check for errors in enhanced version */
            seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt,
                                               -1, aclass);
        }

        seqlen = ASN1_object_size(ndef, seqcontlen, tag);
        if (!out)
            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;
            ASN1_VALUE **pseqval;
            seqtt = asn1_do_adb(pval, tt, 1);
            if (!seqtt)
                return 0;
            pseqval = asn1_get_field_ptr(pval, seqtt);
            /* FIXME: check for errors in enhanced version */
            asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
        }
        if (ndef == 2)
            ASN1_put_eoc(out);
        if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
            return 0;
        return seqlen;

    default:
        return 0;

    }
    return 0;
}

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

    /*
     * 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(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
        int isset, sktag, skaclass;
        int skcontlen, sklen;
        ASN1_VALUE *skitem;

        if (!*pval)
            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_ASN1_VALUE_num(sk); i++) {
            skitem = sk_ASN1_VALUE_value(sk, i);
            skcontlen += ASN1_item_ex_i2d(&skitem, NULL,
                                          ASN1_ITEM_ptr(tt->item),
                                          -1, iclass);
        }
        sklen = ASN1_object_size(ndef, skcontlen, sktag);
        /* If EXPLICIT need length of surrounding tag */
        if (flags & ASN1_TFLG_EXPTAG)
            ret = ASN1_object_size(ndef, sklen, ttag);
        else
            ret = sklen;

        if (!out)
            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 */
        asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
                         isset, iclass);
        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)
            return 0;
        /* Find length of EXPLICIT tag */
        ret = ASN1_object_size(ndef, i, ttag);
        if (out) {
            /* Output tag and item */
            ASN1_put_object(out, ndef, i, ttag, tclass);
            ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, iclass);
            if (ndef == 2)
                ASN1_put_eoc(out);
        }
        return ret;
    }

    /* Either normal or IMPLICIT tagging: combine class and flags */
    return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
                            ttag, tclass | iclass);

}

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

typedef struct {
    unsigned char *data;
    int length;
    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(ASN1_VALUE) *sk, unsigned char **out,
                            int skcontlen, const ASN1_ITEM *item,
                            int do_sort, int iclass)
{
    int i;
    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_ASN1_VALUE_num(sk) < 2)
            do_sort = 0;
        else {
            derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk)
                                    * sizeof(*derlst));
            if (!derlst)
                return 0;
            tmpdat = OPENSSL_malloc(skcontlen);
            if (!tmpdat) {
                OPENSSL_free(derlst);
                return 0;
            }
        }
    }
    /* If not sorting just output each item */
    if (!do_sort) {
        for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
            skitem = sk_ASN1_VALUE_value(sk, i);
            ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
        }
        return 1;
    }
    p = tmpdat;

    /* Doing sort: build up a list of each member's DER encoding */
    for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
        skitem = sk_ASN1_VALUE_value(sk, i);
        tder->data = p;
        tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
        tder->field = skitem;
    }

    /* Now sort them */
    qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
    /* Output sorted DER encoding */
    p = *out;
    for (i = 0, tder = derlst; i < sk_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_ASN1_VALUE_num(sk); i++, tder++)
            (void)sk_ASN1_VALUE_set(sk, i, tder->field);
    }
    OPENSSL_free(derlst);
    OPENSSL_free(tmpdat);
    return 1;
}

static int asn1_i2d_ex_primitive(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(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)
            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 = &typ->value.asn1_value;
    } else
        utype = *putype;

    switch (utype) {
    case V_ASN1_OBJECT:
        otmp = (ASN1_OBJECT *)*pval;
        cont = otmp->data;
        len = otmp->length;
        break;

    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 i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval,
                                   cout ? &cout : NULL);

    case V_ASN1_INTEGER:
    case V_ASN1_NEG_INTEGER:
    case V_ASN1_ENUMERATED:
    case V_ASN1_NEG_ENUMERATED:
        /*
         * These are all have the same content format as ASN1_INTEGER
         */
        return 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;
}
Commit	Line	Data
9d6b1ce6	1	/* tasn_enc.c */
0f113f3e MC	2	/*
	3	* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
	4	* 2000.
9d6b1ce6 DSH	5	*/
9d6b1ce6 DSH	6	/* ====================================================================
8845420f	7	* Copyright (c) 2000-2004 The OpenSSL Project. All rights reserved.
9d6b1ce6 DSH	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
0f113f3e	14	* notice, this list of conditions and the following disclaimer.
9d6b1ce6 DSH	15	*
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in
	18	* the documentation and/or other materials provided with the
	19	* distribution.
	20	*
	21	* 3. All advertising materials mentioning features or use of this
	22	* software must display the following acknowledgment:
	23	* "This product includes software developed by the OpenSSL Project
	24	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	25	*
	26	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	27	* endorse or promote products derived from this software without
	28	* prior written permission. For written permission, please contact
	29	* licensing@OpenSSL.org.
	30	*
	31	* 5. Products derived from this software may not be called "OpenSSL"
	32	* nor may "OpenSSL" appear in their names without prior written
	33	* permission of the OpenSSL Project.
	34	*
	35	* 6. Redistributions of any form whatsoever must retain the following
	36	* acknowledgment:
	37	* "This product includes software developed by the OpenSSL Project
	38	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	39	*
	40	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	41	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	43	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	44	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	45	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	46	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	47	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	49	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	50	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	51	* OF THE POSSIBILITY OF SUCH DAMAGE.
	52	* ====================================================================
	53	*
	54	* This product includes cryptographic software written by Eric Young
	55	* (eay@cryptsoft.com). This product includes software written by Tim
	56	* Hudson (tjh@cryptsoft.com).
	57	*
	58	*/
	59
9d6b1ce6	60	#include <stddef.h>
d8770f3e	61	#include <string.h>
b39fc560	62	#include "internal/cryptlib.h"
9d6b1ce6 DSH	63	#include <openssl/asn1.h>
	64	#include <openssl/asn1t.h>
	65	#include <openssl/objects.h>
2e430277	66	#include "internal/asn1_int.h"
c1ee50aa	67	#include "asn1_locl.h"
9d6b1ce6	68
230fd6b7	69	static int asn1_i2d_ex_primitive(ASN1_VALUE pval, unsigned char out,
0f113f3e	70	const ASN1_ITEM *it, int tag, int aclass);
230fd6b7	71	static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) sk, unsigned char *out,
0f113f3e MC	72	int skcontlen, const ASN1_ITEM *item,
0f113f3e MC	73	int do_sort, int iclass);
230fd6b7	74	static int asn1_template_ex_i2d(ASN1_VALUE pval, unsigned char out,
0f113f3e	75	const ASN1_TEMPLATE *tt, int tag, int aclass);
230fd6b7	76	static int asn1_item_flags_i2d(ASN1_VALUE val, unsigned char *out,
0f113f3e	77	const ASN1_ITEM *it, int flags);
23dc1706 DSH	78	static int asn1_ex_i2c(ASN1_VALUE *pval, unsigned char cout, int *putype,
23dc1706 DSH	79	const ASN1_ITEM *it);
230fd6b7	80
0f113f3e MC	81	/*
	82	* Top level i2d equivalents: the 'ndef' variant instructs the encoder to use
	83	* indefinite length constructed encoding, where appropriate
230fd6b7 DSH	84	*/
230fd6b7 DSH	85
8845420f	86	int ASN1_item_ndef_i2d(ASN1_VALUE val, unsigned char *out,
0f113f3e MC	87	const ASN1_ITEM *it)
	88	{
	89	return asn1_item_flags_i2d(val, out, it, ASN1_TFLG_NDEF);
	90	}
9d6b1ce6	91
230fd6b7	92	int ASN1_item_i2d(ASN1_VALUE val, unsigned char out, const ASN1_ITEM it)
0f113f3e MC	93	{
	94	return asn1_item_flags_i2d(val, out, it, 0);
	95	}
230fd6b7	96
0f113f3e MC	97	/*
	98	* Encode an ASN1 item, this is use by the standard 'i2d' function. 'out'
	99	* points to a buffer to output the data to. The new i2d has one additional
	100	* feature. If the output buffer is NULL (i.e. *out == NULL) then a buffer is
9d6b1ce6 DSH	101	* allocated and populated with the encoding.
	102	*/
	103
8845420f	104	static int asn1_item_flags_i2d(ASN1_VALUE val, unsigned char *out,
0f113f3e MC	105	const ASN1_ITEM *it, int flags)
	106	{
	107	if (out && !*out) {
	108	unsigned char p, buf;
	109	int len;
	110	len = ASN1_item_ex_i2d(&val, NULL, it, -1, flags);
	111	if (len <= 0)
	112	return len;
	113	buf = OPENSSL_malloc(len);
	114	if (!buf)
	115	return -1;
	116	p = buf;
	117	ASN1_item_ex_i2d(&val, &p, it, -1, flags);
	118	*out = buf;
	119	return len;
	120	}
	121
	122	return ASN1_item_ex_i2d(&val, out, it, -1, flags);
	123	}
	124
	125	/*
	126	* Encode an item, taking care of IMPLICIT tagging (if any). This function
	127	* performs the normal item handling: it can be used in external types.
9d6b1ce6 DSH	128	*/
9d6b1ce6 DSH	129
230fd6b7	130	int ASN1_item_ex_i2d(ASN1_VALUE pval, unsigned char out,
0f113f3e MC	131	const ASN1_ITEM *it, int tag, int aclass)
	132	{
	133	const ASN1_TEMPLATE *tt = NULL;
0f113f3e	134	int i, seqcontlen, seqlen, ndef = 1;
0f113f3e MC	135	const ASN1_EXTERN_FUNCS *ef;
	136	const ASN1_AUX *aux = it->funcs;
	137	ASN1_aux_cb *asn1_cb = 0;
	138
	139	if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval)
	140	return 0;
	141
	142	if (aux && aux->asn1_cb)
	143	asn1_cb = aux->asn1_cb;
	144
	145	switch (it->itype) {
	146
	147	case ASN1_ITYPE_PRIMITIVE:
	148	if (it->templates)
	149	return asn1_template_ex_i2d(pval, out, it->templates,
	150	tag, aclass);
	151	return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
0f113f3e MC	152
	153	case ASN1_ITYPE_MSTRING:
	154	return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
	155
	156	case ASN1_ITYPE_CHOICE:
	157	if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
	158	return 0;
	159	i = asn1_get_choice_selector(pval, it);
	160	if ((i >= 0) && (i < it->tcount)) {
	161	ASN1_VALUE **pchval;
	162	const ASN1_TEMPLATE *chtt;
	163	chtt = it->templates + i;
	164	pchval = asn1_get_field_ptr(pval, chtt);
	165	return asn1_template_ex_i2d(pchval, out, chtt, -1, aclass);
	166	}
	167	/* Fixme: error condition if selector out of range */
	168	if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
	169	return 0;
	170	break;
	171
	172	case ASN1_ITYPE_EXTERN:
	173	/* If new style i2d it does all the work */
	174	ef = it->funcs;
	175	return ef->asn1_ex_i2d(pval, out, it, tag, aclass);
	176
0f113f3e MC	177	case ASN1_ITYPE_NDEF_SEQUENCE:
	178	/* Use indefinite length constructed if requested */
	179	if (aclass & ASN1_TFLG_NDEF)
	180	ndef = 2;
	181	/* fall through */
	182
	183	case ASN1_ITYPE_SEQUENCE:
	184	i = asn1_enc_restore(&seqcontlen, out, pval, it);
	185	/* An error occurred */
	186	if (i < 0)
	187	return 0;
	188	/* We have a valid cached encoding... */
	189	if (i > 0)
	190	return seqcontlen;
	191	/* Otherwise carry on */
	192	seqcontlen = 0;
	193	/* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */
	194	if (tag == -1) {
	195	tag = V_ASN1_SEQUENCE;
	196	/* Retain any other flags in aclass */
	197	aclass = (aclass & ~ASN1_TFLG_TAG_CLASS)
	198	\| V_ASN1_UNIVERSAL;
	199	}
	200	if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
	201	return 0;
	202	/* First work out sequence content length */
	203	for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
	204	const ASN1_TEMPLATE *seqtt;
	205	ASN1_VALUE **pseqval;
	206	seqtt = asn1_do_adb(pval, tt, 1);
	207	if (!seqtt)
	208	return 0;
	209	pseqval = asn1_get_field_ptr(pval, seqtt);
	210	/* FIXME: check for errors in enhanced version */
	211	seqcontlen += asn1_template_ex_i2d(pseqval, NULL, seqtt,
	212	-1, aclass);
	213	}
	214
	215	seqlen = ASN1_object_size(ndef, seqcontlen, tag);
	216	if (!out)
	217	return seqlen;
	218	/* Output SEQUENCE header */
	219	ASN1_put_object(out, ndef, seqcontlen, tag, aclass);
	220	for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
	221	const ASN1_TEMPLATE *seqtt;
	222	ASN1_VALUE **pseqval;
	223	seqtt = asn1_do_adb(pval, tt, 1);
	224	if (!seqtt)
	225	return 0;
	226	pseqval = asn1_get_field_ptr(pval, seqtt);
	227	/* FIXME: check for errors in enhanced version */
	228	asn1_template_ex_i2d(pseqval, out, seqtt, -1, aclass);
	229	}
	230	if (ndef == 2)
	231	ASN1_put_eoc(out);
	232	if (asn1_cb && !asn1_cb(ASN1_OP_I2D_POST, pval, it, NULL))
	233	return 0;
	234	return seqlen;
	235
	236	default:
	237	return 0;
	238
	239	}
	240	return 0;
241	}
9d6b1ce6	242
8845420f	243	static int asn1_template_ex_i2d(ASN1_VALUE pval, unsigned char out,
0f113f3e MC	244	const ASN1_TEMPLATE *tt, int tag, int iclass)
	245	{
	246	int i, ret, flags, ttag, tclass, ndef;
de17bd5d	247	ASN1_VALUE *tval;
0f113f3e	248	flags = tt->flags;
de17bd5d DSH	249
	250	/*
	251	* If field is embedded then val needs fixing so it is a pointer to
	252	* a pointer to a field.
	253	*/
	254	if (flags & ASN1_TFLG_EMBED) {
	255	tval = (ASN1_VALUE *)pval;
	256	pval = &tval;
	257	}
0f113f3e MC	258	/*
	259	* Work out tag and class to use: tagging may come either from the
	260	* template or the arguments, not both because this would create
	261	* ambiguity. Additionally the iclass argument may contain some
	262	* additional flags which should be noted and passed down to other
	263	* levels.
	264	*/
	265	if (flags & ASN1_TFLG_TAG_MASK) {
	266	/* Error if argument and template tagging */
	267	if (tag != -1)
	268	/* FIXME: error code here */
	269	return -1;
	270	/* Get tagging from template */
	271	ttag = tt->tag;
	272	tclass = flags & ASN1_TFLG_TAG_CLASS;
	273	} else if (tag != -1) {
	274	/* No template tagging, get from arguments */
	275	ttag = tag;
	276	tclass = iclass & ASN1_TFLG_TAG_CLASS;
	277	} else {
	278	ttag = -1;
	279	tclass = 0;
	280	}
	281	/*
	282	* Remove any class mask from iflag.
	283	*/
	284	iclass &= ~ASN1_TFLG_TAG_CLASS;
	285
	286	/*
	287	* At this point 'ttag' contains the outer tag to use, 'tclass' is the
	288	* class and iclass is any flags passed to this function.
	289	*/
	290
	291	/* if template and arguments require ndef, use it */
	292	if ((flags & ASN1_TFLG_NDEF) && (iclass & ASN1_TFLG_NDEF))
	293	ndef = 2;
	294	else
	295	ndef = 1;
	296
	297	if (flags & ASN1_TFLG_SK_MASK) {
	298	/* SET OF, SEQUENCE OF */
	299	STACK_OF(ASN1_VALUE) sk = (STACK_OF(ASN1_VALUE) )*pval;
	300	int isset, sktag, skaclass;
	301	int skcontlen, sklen;
	302	ASN1_VALUE *skitem;
	303
	304	if (!*pval)
	305	return 0;
	306
	307	if (flags & ASN1_TFLG_SET_OF) {
	308	isset = 1;
	309	/* 2 means we reorder */
	310	if (flags & ASN1_TFLG_SEQUENCE_OF)
	311	isset = 2;
	312	} else
	313	isset = 0;
	314
	315	/*
	316	* Work out inner tag value: if EXPLICIT or no tagging use underlying
	317	* type.
	318	*/
	319	if ((ttag != -1) && !(flags & ASN1_TFLG_EXPTAG)) {
	320	sktag = ttag;
	321	skaclass = tclass;
322	} else {
323	skaclass = V_ASN1_UNIVERSAL;
324	if (isset)
325	sktag = V_ASN1_SET;
326	else
327	sktag = V_ASN1_SEQUENCE;
328	}
329
330	/* Determine total length of items */
331	skcontlen = 0;
332	for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
333	skitem = sk_ASN1_VALUE_value(sk, i);
334	skcontlen += ASN1_item_ex_i2d(&skitem, NULL,
335	ASN1_ITEM_ptr(tt->item),
336	-1, iclass);
337	}
338	sklen = ASN1_object_size(ndef, skcontlen, sktag);
339	/* If EXPLICIT need length of surrounding tag */
340	if (flags & ASN1_TFLG_EXPTAG)
341	ret = ASN1_object_size(ndef, sklen, ttag);
342	else
343	ret = sklen;
344
345	if (!out)
346	return ret;
347
348	/* Now encode this lot... */
349	/* EXPLICIT tag */
350	if (flags & ASN1_TFLG_EXPTAG)
351	ASN1_put_object(out, ndef, sklen, ttag, tclass);
352	/* SET or SEQUENCE and IMPLICIT tag */
353	ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
354	/* And the stuff itself */
355	asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
356	isset, iclass);
357	if (ndef == 2) {
358	ASN1_put_eoc(out);
359	if (flags & ASN1_TFLG_EXPTAG)
360	ASN1_put_eoc(out);
361	}
362
363	return ret;
364	}
365
366	if (flags & ASN1_TFLG_EXPTAG) {
367	/* EXPLICIT tagging */
368	/* Find length of tagged item */
369	i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item), -1, iclass);
370	if (!i)
371	return 0;
372	/* Find length of EXPLICIT tag */
373	ret = ASN1_object_size(ndef, i, ttag);
374	if (out) {
375	/* Output tag and item */
376	ASN1_put_object(out, ndef, i, ttag, tclass);
377	ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item), -1, iclass);
378	if (ndef == 2)
379	ASN1_put_eoc(out);
380	}
381	return ret;
382	}
383
384	/* Either normal or IMPLICIT tagging: combine class and flags */
385	return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
386	ttag, tclass \| iclass);
230fd6b7	387
9d6b1ce6 DSH	388	}
	389
	390	/* Temporary structure used to hold DER encoding of items for SET OF */
	391
0f113f3e MC	392	typedef struct {
	393	unsigned char *data;
	394	int length;
	395	ASN1_VALUE *field;
9d6b1ce6 DSH	396	} DER_ENC;
	397
	398	static int der_cmp(const void a, const void b)
0f113f3e MC	399	{
	400	const DER_ENC d1 = a, d2 = b;
	401	int cmplen, i;
	402	cmplen = (d1->length < d2->length) ? d1->length : d2->length;
	403	i = memcmp(d1->data, d2->data, cmplen);
	404	if (i)
	405	return i;
	406	return d1->length - d2->length;
	407	}
9d6b1ce6 DSH	408
	409	/* Output the content octets of SET OF or SEQUENCE OF */
	410
230fd6b7	411	static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) sk, unsigned char *out,
0f113f3e MC	412	int skcontlen, const ASN1_ITEM *item,
	413	int do_sort, int iclass)
	414	{
	415	int i;
	416	ASN1_VALUE *skitem;
	417	unsigned char tmpdat = NULL, p = NULL;
	418	DER_ENC derlst = NULL, tder;
	419	if (do_sort) {
	420	/* Don't need to sort less than 2 items */
	421	if (sk_ASN1_VALUE_num(sk) < 2)
	422	do_sort = 0;
	423	else {
	424	derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk)
	425	* sizeof(*derlst));
	426	if (!derlst)
	427	return 0;
	428	tmpdat = OPENSSL_malloc(skcontlen);
	429	if (!tmpdat) {
	430	OPENSSL_free(derlst);
	431	return 0;
	432	}
	433	}
	434	}
	435	/* If not sorting just output each item */
	436	if (!do_sort) {
	437	for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
	438	skitem = sk_ASN1_VALUE_value(sk, i);
	439	ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
	440	}
	441	return 1;
	442	}
	443	p = tmpdat;
	444
	445	/* Doing sort: build up a list of each member's DER encoding */
	446	for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
	447	skitem = sk_ASN1_VALUE_value(sk, i);
	448	tder->data = p;
	449	tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
	450	tder->field = skitem;
	451	}
	452
	453	/* Now sort them */
	454	qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
	455	/* Output sorted DER encoding */
	456	p = *out;
	457	for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++) {
	458	memcpy(p, tder->data, tder->length);
	459	p += tder->length;
	460	}
	461	*out = p;
	462	/* If do_sort is 2 then reorder the STACK */
	463	if (do_sort == 2) {
	464	for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
	465	(void)sk_ASN1_VALUE_set(sk, i, tder->field);
	466	}
	467	OPENSSL_free(derlst);
	468	OPENSSL_free(tmpdat);
	469	return 1;
	470	}
9d6b1ce6	471
8845420f	472	static int asn1_i2d_ex_primitive(ASN1_VALUE pval, unsigned char out,
0f113f3e MC	473	const ASN1_ITEM *it, int tag, int aclass)
	474	{
	475	int len;
	476	int utype;
	477	int usetag;
	478	int ndef = 0;
	479
	480	utype = it->utype;
	481
	482	/*
	483	* Get length of content octets and maybe find out the underlying type.
	484	*/
	485
	486	len = asn1_ex_i2c(pval, NULL, &utype, it);
	487
	488	/*
	489	* If SEQUENCE, SET or OTHER then header is included in pseudo content
	490	* octets so don't include tag+length. We need to check here because the
	491	* call to asn1_ex_i2c() could change utype.
	492	*/
	493	if ((utype == V_ASN1_SEQUENCE) \|\| (utype == V_ASN1_SET) \|\|
	494	(utype == V_ASN1_OTHER))
	495	usetag = 0;
	496	else
	497	usetag = 1;
	498
	499	/* -1 means omit type */
	500
	501	if (len == -1)
	502	return 0;
	503
	504	/* -2 return is special meaning use ndef */
	505	if (len == -2) {
	506	ndef = 2;
	507	len = 0;
	508	}
	509
	510	/* If not implicitly tagged get tag from underlying type */
	511	if (tag == -1)
	512	tag = utype;
	513
	514	/* Output tag+length followed by content octets */
	515	if (out) {
	516	if (usetag)
	517	ASN1_put_object(out, ndef, len, tag, aclass);
	518	asn1_ex_i2c(pval, *out, &utype, it);
	519	if (ndef)
	520	ASN1_put_eoc(out);
	521	else
	522	*out += len;
	523	}
	524
	525	if (usetag)
	526	return ASN1_object_size(ndef, len, tag);
	527	return len;
	528	}
9d6b1ce6 DSH	529
	530	/* Produce content octets from a structure */
	531
23dc1706 DSH	532	static int asn1_ex_i2c(ASN1_VALUE *pval, unsigned char cout, int *putype,
23dc1706 DSH	533	const ASN1_ITEM *it)
0f113f3e MC	534	{
	535	ASN1_BOOLEAN *tbool = NULL;
	536	ASN1_STRING *strtmp;
	537	ASN1_OBJECT *otmp;
	538	int utype;
	539	const unsigned char *cont;
	540	unsigned char c;
	541	int len;
	542	const ASN1_PRIMITIVE_FUNCS *pf;
	543	pf = it->funcs;
	544	if (pf && pf->prim_i2c)
	545	return pf->prim_i2c(pval, cout, putype, it);
	546
	547	/* Should type be omitted? */
	548	if ((it->itype != ASN1_ITYPE_PRIMITIVE)
	549	\|\| (it->utype != V_ASN1_BOOLEAN)) {
	550	if (!*pval)
	551	return -1;
	552	}
	553
	554	if (it->itype == ASN1_ITYPE_MSTRING) {
	555	/* If MSTRING type set the underlying type */
	556	strtmp = (ASN1_STRING )pval;
	557	utype = strtmp->type;
	558	*putype = utype;
	559	} else if (it->utype == V_ASN1_ANY) {
	560	/* If ANY set type and pointer to value */
	561	ASN1_TYPE *typ;
	562	typ = (ASN1_TYPE )pval;
	563	utype = typ->type;
	564	*putype = utype;
	565	pval = &typ->value.asn1_value;
	566	} else
	567	utype = *putype;
	568
	569	switch (utype) {
	570	case V_ASN1_OBJECT:
	571	otmp = (ASN1_OBJECT )pval;
	572	cont = otmp->data;
	573	len = otmp->length;
	574	break;
	575
	576	case V_ASN1_NULL:
	577	cont = NULL;
	578	len = 0;
	579	break;
	580
	581	case V_ASN1_BOOLEAN:
	582	tbool = (ASN1_BOOLEAN *)pval;
	583	if (*tbool == -1)
	584	return -1;
	585	if (it->utype != V_ASN1_ANY) {
	586	/*
	587	* Default handling if value == size field then omit
	588	*/
	589	if (*tbool && (it->size > 0))
	590	return -1;
	591	if (!*tbool && !it->size)
	592	return -1;
	593	}
	594	c = (unsigned char)*tbool;
	595	cont = &c;
	596	len = 1;
	597	break;
598
599	case V_ASN1_BIT_STRING:
600	return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING )pval,
601	cout ? &cout : NULL);
0f113f3e MC	602
	603	case V_ASN1_INTEGER:
	604	case V_ASN1_NEG_INTEGER:
	605	case V_ASN1_ENUMERATED:
	606	case V_ASN1_NEG_ENUMERATED:
	607	/*
	608	* These are all have the same content format as ASN1_INTEGER
	609	*/
	610	return i2c_ASN1_INTEGER((ASN1_INTEGER )pval, cout ? &cout : NULL);
0f113f3e MC	611
	612	case V_ASN1_OCTET_STRING:
	613	case V_ASN1_NUMERICSTRING:
	614	case V_ASN1_PRINTABLESTRING:
	615	case V_ASN1_T61STRING:
	616	case V_ASN1_VIDEOTEXSTRING:
	617	case V_ASN1_IA5STRING:
	618	case V_ASN1_UTCTIME:
	619	case V_ASN1_GENERALIZEDTIME:
	620	case V_ASN1_GRAPHICSTRING:
	621	case V_ASN1_VISIBLESTRING:
	622	case V_ASN1_GENERALSTRING:
	623	case V_ASN1_UNIVERSALSTRING:
	624	case V_ASN1_BMPSTRING:
	625	case V_ASN1_UTF8STRING:
	626	case V_ASN1_SEQUENCE:
	627	case V_ASN1_SET:
	628	default:
	629	/* All based on ASN1_STRING and handled the same */
	630	strtmp = (ASN1_STRING )pval;
	631	/* Special handling for NDEF */
	632	if ((it->size == ASN1_TFLG_NDEF)
	633	&& (strtmp->flags & ASN1_STRING_FLAG_NDEF)) {
	634	if (cout) {
	635	strtmp->data = cout;
	636	strtmp->length = 0;
	637	}
	638	/* Special return code */
	639	return -2;
	640	}
	641	cont = strtmp->data;
	642	len = strtmp->length;
	643
	644	break;
	645
	646	}
	647	if (cout && len)
	648	memcpy(cout, cont, len);
	649	return len;
	650	}