src/omxmlsec/iv.c

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdio.h>
#include <axis2_util.h>
#include <oxs_iv.h>
#include <oxs_buffer.h>
#include <oxs_cipher.h>
#include <oxs_error.h>
#include <openssl_cipher_property.h>


AXIS2_EXTERN axis2_char_t* AXIS2_CALL
oxs_iv_generate_for_algo(const axutil_env_t *env,
                         axis2_char_t *key_algo)
{
    axis2_char_t* iv = NULL;
    openssl_cipher_property_t *cprop = NULL;
    int size;
    cprop =  oxs_get_cipher_property_for_url(env, key_algo);
    if (!cprop)
    {
        oxs_error(env, OXS_ERROR_LOCATION, OXS_ERROR_DEFAULT,
                  "openssl_get_cipher_property failed");
        return NULL;
    }
    size = openssl_cipher_property_get_iv_size(cprop, env);

    openssl_cipher_property_free(cprop, env);
    cprop = NULL;

    /*Here we have predefined IVs in the openssl_constants.
      Get the correct one using the size*/

    if (size == 8)
    {
        iv = OPENSSL_DEFAULT_IV8;
    }
    else if (size == 16)
    {
        iv = OPENSSL_DEFAULT_IV16;
    }
    else if (size == 24)
    {
        iv = OPENSSL_DEFAULT_IV24;
    }
    else
    {
        iv = OXS_IV_DEFAULT;
    }

    return iv;
}