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/**
* \file bignum_helpers.c
*
* \brief This file contains the prototypes of helper functions for
* bignum-related testing.
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed 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.
*/
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
#include <test/bignum_helpers.h>
#if defined(MBEDTLS_BIGNUM_C)
#include <stdlib.h>
#include <string.h>
#include <mbedtls/bignum.h>
#include <bignum_core.h>
#include <bignum_mod.h>
#include <bignum_mod_raw.h>
#include <test/helpers.h>
#include <test/macros.h>
int mbedtls_test_read_mpi_core(mbedtls_mpi_uint **pX, size_t *plimbs,
const char *input)
{
/* Sanity check */
if (*pX != NULL) {
return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
}
size_t hex_len = strlen(input);
size_t byte_len = (hex_len + 1) / 2;
*plimbs = CHARS_TO_LIMBS(byte_len);
/* A core bignum is not allowed to be empty. Forbid it as test data,
* this way static analyzers have a chance of knowing we don't expect
* the bignum functions to support empty inputs. */
if (*plimbs == 0) {
return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
}
*pX = mbedtls_calloc(*plimbs, sizeof(**pX));
if (*pX == NULL) {
return MBEDTLS_ERR_MPI_ALLOC_FAILED;
}
unsigned char *byte_start = (unsigned char *) *pX;
if (byte_len % sizeof(mbedtls_mpi_uint) != 0) {
byte_start += sizeof(mbedtls_mpi_uint) - byte_len % sizeof(mbedtls_mpi_uint);
}
if ((hex_len & 1) != 0) {
/* mbedtls_test_unhexify wants an even number of hex digits */
TEST_ASSERT(mbedtls_test_ascii2uc(*input, byte_start) == 0);
++byte_start;
++input;
--byte_len;
}
TEST_ASSERT(mbedtls_test_unhexify(byte_start,
byte_len,
input,
&byte_len) == 0);
mbedtls_mpi_core_bigendian_to_host(*pX, *plimbs);
return 0;
exit:
mbedtls_free(*pX);
return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
}
int mbedtls_test_read_mpi_modulus(mbedtls_mpi_mod_modulus *N,
const char *s,
mbedtls_mpi_mod_rep_selector int_rep)
{
mbedtls_mpi_uint *p = NULL;
size_t limbs = 0;
if (N->limbs != 0) {
return MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
}
int ret = mbedtls_test_read_mpi_core(&p, &limbs, s);
if (ret != 0) {
return ret;
}
ret = mbedtls_mpi_mod_modulus_setup(N, p, limbs, int_rep);
if (ret != 0) {
mbedtls_free(p);
}
return ret;
}
void mbedtls_test_mpi_mod_modulus_free_with_limbs(mbedtls_mpi_mod_modulus *N)
{
mbedtls_free((mbedtls_mpi_uint *) N->p);
mbedtls_mpi_mod_modulus_free(N);
}
int mbedtls_test_read_mpi(mbedtls_mpi *X, const char *s)
{
int negative = 0;
/* Always set the sign bit to -1 if the input has a minus sign, even for 0.
* This creates an invalid representation, which mbedtls_mpi_read_string()
* avoids but we want to be able to create that in test data. */
if (s[0] == '-') {
++s;
negative = 1;
}
/* mbedtls_mpi_read_string() currently retains leading zeros.
* It always allocates at least one limb for the value 0. */
if (s[0] == 0) {
mbedtls_mpi_free(X);
return 0;
}
int ret = mbedtls_mpi_read_string(X, 16, s);
if (ret != 0) {
return ret;
}
if (negative) {
if (mbedtls_mpi_cmp_int(X, 0) == 0) {
++mbedtls_test_case_uses_negative_0;
}
X->s = -1;
}
return 0;
}
#endif /* MBEDTLS_BIGNUM_C */
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