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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 <assert.h>
#include <cbmc_proof/cbmc_utils.h>
#include <cbmc_proof/make_common_datastructures.h>
#include "api/s2n.h"
#include "utils/s2n_blob.h"
/*
* There's unreachable code in the CBMC output because s2n_dup calls
* s2n_alloc, which itself calls s2n_realloc. Since the to blob must
* be size 0 with a null data pointer to pass the first checks in s2n_dup,
* many branches of s2n_realloc cannot be executed. This is intentional behavior.
*/
void s2n_dup_harness()
{
struct s2n_blob *from = cbmc_allocate_s2n_blob();
struct s2n_blob *to = cbmc_allocate_s2n_blob();
__CPROVER_assume(s2n_result_is_ok(s2n_blob_validate(from)));
__CPROVER_assume(s2n_result_is_ok(s2n_blob_validate(to)));
const struct s2n_blob old_from = *from;
const struct s2n_blob old_to = *to;
struct store_byte_from_buffer old_byte;
save_byte_from_blob(from, &old_byte);
nondet_s2n_mem_init();
if (s2n_dup(from, to) == S2N_SUCCESS) {
assert(old_from.size != 0);
assert(old_from.data != NULL);
assert(old_to.size == 0);
assert(old_to.data == NULL);
assert(to->size == from->size);
uint32_t idx;
__CPROVER_assume(idx < from->size);
assert(from->data[ idx ] == to->data[ idx ]);
}
assert(s2n_result_is_ok(s2n_blob_validate(from)));
assert(s2n_result_is_ok(s2n_blob_validate(to)));
assert_blob_equivalence(from, &old_from, &old_byte);
}
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