openssl/crypto/objects/obj_lib.c

/*
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/lhash.h>
#include <openssl/objects.h>
#include <openssl/buffer.h>
#include "internal/asn1_int.h"

ASN1_OBJECT *OBJ_dup(const ASN1_OBJECT *o)
{
    ASN1_OBJECT *r;
    int i;
    char *ln = NULL, *sn = NULL;
    unsigned char *data = NULL;

    if (o == NULL)
        return (NULL);
    if (!(o->flags & ASN1_OBJECT_FLAG_DYNAMIC))
        return ((ASN1_OBJECT *)o); /* XXX: ugh! Why? What kind of duplication
                                    * is this??? */

    r = ASN1_OBJECT_new();
    if (r == NULL) {
        OBJerr(OBJ_F_OBJ_DUP, ERR_R_ASN1_LIB);
        return (NULL);
    }
    data = OPENSSL_malloc(o->length);
    if (data == NULL)
        goto err;
    if (o->data != NULL)
        memcpy(data, o->data, o->length);
    /* once data attached to object it remains const */
    r->data = data;
    r->length = o->length;
    r->nid = o->nid;
    r->ln = r->sn = NULL;
    if (o->ln != NULL) {
        i = strlen(o->ln) + 1;
        ln = OPENSSL_malloc(i);
        if (ln == NULL)
            goto err;
        memcpy(ln, o->ln, i);
        r->ln = ln;
    }

    if (o->sn != NULL) {
        i = strlen(o->sn) + 1;
        sn = OPENSSL_malloc(i);
        if (sn == NULL)
            goto err;
        memcpy(sn, o->sn, i);
        r->sn = sn;
    }
    r->flags = o->flags | (ASN1_OBJECT_FLAG_DYNAMIC |
                           ASN1_OBJECT_FLAG_DYNAMIC_STRINGS |
                           ASN1_OBJECT_FLAG_DYNAMIC_DATA);
    return (r);
 err:
    OBJerr(OBJ_F_OBJ_DUP, ERR_R_MALLOC_FAILURE);
    OPENSSL_free(ln);
    OPENSSL_free(sn);
    OPENSSL_free(data);
    OPENSSL_free(r);
    return (NULL);
}

int OBJ_cmp(const ASN1_OBJECT *a, const ASN1_OBJECT *b)
{
    int ret;

    ret = (a->length - b->length);
    if (ret)
        return (ret);
    return (memcmp(a->data, b->data, a->length));
}