ref: 5ebb1a29d8250027e8b7f2287f3bfa3a6f3d13ac
dir: /sys/src/ape/lib/openssl/crypto/asn1/tasn_utl.c/
/* tasn_utl.c */
/* Written by Dr Stephen N Henson ([email protected]) 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
* [email protected].
*
* 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
* ([email protected]). This product includes software written by Tim
* Hudson ([email protected]).
*
*/
#include <stddef.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include <openssl/err.h>
/* Utility functions for manipulating fields and offsets */
/* Add 'offset' to 'addr' */
#define offset2ptr(addr, offset) (void *)(((char *) addr) + offset)
/* Given an ASN1_ITEM CHOICE type return
* the selector value
*/
int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
int *sel = offset2ptr(*pval, it->utype);
return *sel;
}
/* Given an ASN1_ITEM CHOICE type set
* the selector value, return old value.
*/
int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it)
{
int *sel, ret;
sel = offset2ptr(*pval, it->utype);
ret = *sel;
*sel = value;
return ret;
}
/* Do reference counting. The value 'op' decides what to do.
* if it is +1 then the count is incremented. If op is 0 count is
* set to 1. If op is -1 count is decremented and the return value
* is the current refrence count or 0 if no reference count exists.
*/
int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)
{
const ASN1_AUX *aux;
int *lck, ret;
if ((it->itype != ASN1_ITYPE_SEQUENCE)
&& (it->itype != ASN1_ITYPE_NDEF_SEQUENCE))
return 0;
aux = it->funcs;
if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT))
return 0;
lck = offset2ptr(*pval, aux->ref_offset);
if (op == 0)
{
*lck = 1;
return 1;
}
ret = CRYPTO_add(lck, op, aux->ref_lock);
#ifdef REF_PRINT
fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck);
#endif
#ifdef REF_CHECK
if (ret < 0)
fprintf(stderr, "%s, bad reference count\n", it->sname);
#endif
return ret;
}
static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
const ASN1_AUX *aux;
if (!pval || !*pval)
return NULL;
aux = it->funcs;
if (!aux || !(aux->flags & ASN1_AFLG_ENCODING))
return NULL;
return offset2ptr(*pval, aux->enc_offset);
}
void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (enc)
{
enc->enc = NULL;
enc->len = 0;
enc->modified = 1;
}
}
void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (enc)
{
if (enc->enc)
OPENSSL_free(enc->enc);
enc->enc = NULL;
enc->len = 0;
enc->modified = 1;
}
}
int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,
const ASN1_ITEM *it)
{
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (!enc)
return 1;
if (enc->enc)
OPENSSL_free(enc->enc);
enc->enc = OPENSSL_malloc(inlen);
if (!enc->enc)
return 0;
memcpy(enc->enc, in, inlen);
enc->len = inlen;
enc->modified = 0;
return 1;
}
int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,
const ASN1_ITEM *it)
{
ASN1_ENCODING *enc;
enc = asn1_get_enc_ptr(pval, it);
if (!enc || enc->modified)
return 0;
if (out)
{
memcpy(*out, enc->enc, enc->len);
*out += enc->len;
}
if (len)
*len = enc->len;
return 1;
}
/* Given an ASN1_TEMPLATE get a pointer to a field */
ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
{
ASN1_VALUE **pvaltmp;
if (tt->flags & ASN1_TFLG_COMBINE)
return pval;
pvaltmp = offset2ptr(*pval, tt->offset);
/* NOTE for BOOLEAN types the field is just a plain
* int so we can't return int **, so settle for
* (int *).
*/
return pvaltmp;
}
/* Handle ANY DEFINED BY template, find the selector, look up
* the relevant ASN1_TEMPLATE in the table and return it.
*/
const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
int nullerr)
{
const ASN1_ADB *adb;
const ASN1_ADB_TABLE *atbl;
long selector;
ASN1_VALUE **sfld;
int i;
if (!(tt->flags & ASN1_TFLG_ADB_MASK))
return tt;
/* Else ANY DEFINED BY ... get the table */
adb = ASN1_ADB_ptr(tt->item);
/* Get the selector field */
sfld = offset2ptr(*pval, adb->offset);
/* Check if NULL */
if (!sfld)
{
if (!adb->null_tt)
goto err;
return adb->null_tt;
}
/* Convert type to a long:
* NB: don't check for NID_undef here because it
* might be a legitimate value in the table
*/
if (tt->flags & ASN1_TFLG_ADB_OID)
selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
else
selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
/* Try to find matching entry in table
* Maybe should check application types first to
* allow application override? Might also be useful
* to have a flag which indicates table is sorted and
* we can do a binary search. For now stick to a
* linear search.
*/
for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)
if (atbl->value == selector)
return &atbl->tt;
/* FIXME: need to search application table too */
/* No match, return default type */
if (!adb->default_tt)
goto err;
return adb->default_tt;
err:
/* FIXME: should log the value or OID of unsupported type */
if (nullerr)
ASN1err(ASN1_F_ASN1_DO_ADB,
ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
return NULL;
}