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components/wpa_supplicant/esp_supplicant/src/crypto/crypto_mbedtls-bignum.c
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/*
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifdef ESP_PLATFORM
#include "esp_system.h"
#include "mbedtls/bignum.h"
#endif
#include "utils/includes.h"
#include "utils/common.h"
#include "crypto.h"
#include "random.h"
#include "sha256.h"
#include "mbedtls/pk.h"
static int crypto_rng_wrapper(void *ctx, unsigned char *buf, size_t len)
{
return random_get_bytes(buf, len);
}
struct crypto_bignum *crypto_bignum_init(void)
{
mbedtls_mpi *bn = os_zalloc(sizeof(mbedtls_mpi));
if (bn == NULL) {
return NULL;
}
mbedtls_mpi_init(bn);
return (struct crypto_bignum *)bn;
}
struct crypto_bignum *crypto_bignum_init_set(const u8 *buf, size_t len)
{
int ret = 0;
mbedtls_mpi *bn = os_zalloc(sizeof(mbedtls_mpi));
if (bn == NULL) {
return NULL;
}
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(bn, buf, len));
return (struct crypto_bignum *) bn;
cleanup:
os_free(bn);
return NULL;
}
struct crypto_bignum * crypto_bignum_init_uint(unsigned int val)
{
mbedtls_mpi *bn = os_zalloc(sizeof(mbedtls_mpi));
if (bn == NULL) {
return NULL;
}
mbedtls_mpi_init(bn);
mbedtls_mpi_lset(bn, val);
return (struct crypto_bignum *)bn;
}
void crypto_bignum_deinit(struct crypto_bignum *n, int clear)
{
mbedtls_mpi_free((mbedtls_mpi *)n);
os_free((mbedtls_mpi *)n);
}
int crypto_bignum_to_bin(const struct crypto_bignum *a,
u8 *buf, size_t buflen, size_t padlen)
{
int num_bytes, offset;
int ret;
if (padlen > buflen) {
return -1;
}
num_bytes = mbedtls_mpi_size((mbedtls_mpi *) a);
if ((size_t) num_bytes > buflen) {
return -1;
}
if (padlen > (size_t) num_bytes) {
offset = padlen - num_bytes;
} else {
offset = 0;
}
os_memset(buf, 0, offset);
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary((mbedtls_mpi *) a, buf + offset, mbedtls_mpi_size((mbedtls_mpi *)a)));
return num_bytes + offset;
cleanup:
return ret;
}
int crypto_bignum_add(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
return mbedtls_mpi_add_mpi((mbedtls_mpi *) c, (const mbedtls_mpi *) a, (const mbedtls_mpi *) b) ?
-1 : 0;
}
int crypto_bignum_mod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
return mbedtls_mpi_mod_mpi((mbedtls_mpi *) c, (const mbedtls_mpi *) a, (const mbedtls_mpi *) b) ? -1 : 0;
}
int crypto_bignum_exptmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d)
{
return mbedtls_mpi_exp_mod((mbedtls_mpi *) d, (const mbedtls_mpi *) a, (const mbedtls_mpi *) b, (const mbedtls_mpi *) c, NULL) ? -1 : 0;
}
int crypto_bignum_inverse(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
return mbedtls_mpi_inv_mod((mbedtls_mpi *) c, (const mbedtls_mpi *) a,
(const mbedtls_mpi *) b) ? -1 : 0;
}
int crypto_bignum_sub(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
return mbedtls_mpi_sub_mpi((mbedtls_mpi *) c, (const mbedtls_mpi *) a, (const mbedtls_mpi *) b) ?
-1 : 0;
}
int crypto_bignum_div(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
return mbedtls_mpi_div_mpi((mbedtls_mpi *) c, NULL, (const mbedtls_mpi *) a, (const mbedtls_mpi *) b) ?
-1 : 0;
}
int crypto_bignum_mulmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d)
{
return mbedtls_mpi_mul_mpi((mbedtls_mpi *)d, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) ||
mbedtls_mpi_mod_mpi((mbedtls_mpi *)d, (mbedtls_mpi *)d, (const mbedtls_mpi *)c) ? -1 : 0;
}
int crypto_bignum_sqrmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
struct crypto_bignum *c)
{
int res;
struct crypto_bignum *tmp = crypto_bignum_init();
if (!tmp) {
return -1;
}
res = mbedtls_mpi_copy((mbedtls_mpi *) tmp, (const mbedtls_mpi *) a);
res = crypto_bignum_mulmod(a, tmp, b, c);
crypto_bignum_deinit(tmp, 0);
return res ? -1 : 0;
}
int crypto_bignum_rshift(const struct crypto_bignum *a, int n,
struct crypto_bignum *r)
{
int res;
res = mbedtls_mpi_copy((mbedtls_mpi *) r, (const mbedtls_mpi *) a);
if (res) {
return -1;
}
res = mbedtls_mpi_shift_r((mbedtls_mpi *)r, n);
return res ? -1 : 0;
}
int crypto_bignum_cmp(const struct crypto_bignum *a,
const struct crypto_bignum *b)
{
return mbedtls_mpi_cmp_mpi((const mbedtls_mpi *) a, (const mbedtls_mpi *) b);
}
int crypto_bignum_bits(const struct crypto_bignum *a)
{
return mbedtls_mpi_bitlen((const mbedtls_mpi *) a);
}
int crypto_bignum_is_zero(const struct crypto_bignum *a)
{
return (mbedtls_mpi_cmp_int((const mbedtls_mpi *) a, 0) == 0);
}
int crypto_bignum_is_one(const struct crypto_bignum *a)
{
return (mbedtls_mpi_cmp_int((const mbedtls_mpi *) a, 1) == 0);
}
int crypto_bignum_is_odd(const struct crypto_bignum *a)
{
return (mbedtls_mpi_get_bit((const mbedtls_mpi *) a, 0) == 1);
}
int crypto_bignum_rand(struct crypto_bignum *r, const struct crypto_bignum *m)
{
return ((mbedtls_mpi_random((mbedtls_mpi *) r, 0, (const mbedtls_mpi *) m,
crypto_rng_wrapper, NULL) != 0) ? -1 : 0);
}
int crypto_bignum_legendre(const struct crypto_bignum *a,
const struct crypto_bignum *p)
{
mbedtls_mpi exp, tmp;
int res = -2, ret;
mbedtls_mpi_init(&exp);
mbedtls_mpi_init(&tmp);
/* exp = (p-1) / 2 */
MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(&exp, (const mbedtls_mpi *) p, 1));
MBEDTLS_MPI_CHK(mbedtls_mpi_shift_r(&exp, 1));
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&tmp, (const mbedtls_mpi *) a, &exp, (const mbedtls_mpi *) p, NULL));
if (mbedtls_mpi_cmp_int(&tmp, 1) == 0) {
res = 1;
} else if (mbedtls_mpi_cmp_int(&tmp, 0) == 0
/* The below check is workaround for the case where HW
* does not behave properly for X ^ A mod M when X is
* power of M. Instead of returning value 0, value M is
* returned.*/
|| mbedtls_mpi_cmp_mpi(&tmp, (const mbedtls_mpi *)p) == 0) {
res = 0;
} else {
res = -1;
}
cleanup:
mbedtls_mpi_free(&tmp);
mbedtls_mpi_free(&exp);
return res;
}
int crypto_bignum_to_string(const struct crypto_bignum *a,
u8 *buf, size_t buflen, size_t padlen)
{
int num_bytes, offset;
size_t outlen;
if (padlen > buflen) {
return -1;
}
num_bytes = mbedtls_mpi_size((mbedtls_mpi *) a);
if (padlen > (size_t) num_bytes) {
offset = padlen - num_bytes;
} else {
offset = 0;
}
os_memset(buf, 0, offset);
mbedtls_mpi_write_string((mbedtls_mpi *) a, 16, (char *)(buf + offset),
mbedtls_mpi_size((mbedtls_mpi *)a), &outlen);
return outlen;
}
int crypto_bignum_addmod(const struct crypto_bignum *a,
const struct crypto_bignum *b,
const struct crypto_bignum *c,
struct crypto_bignum *d)
{
struct crypto_bignum *tmp = crypto_bignum_init();
int ret = -1;
if (mbedtls_mpi_add_mpi((mbedtls_mpi *) tmp, (const mbedtls_mpi *) a, (const mbedtls_mpi *) b) < 0) {
goto fail;
}
if (mbedtls_mpi_mod_mpi((mbedtls_mpi *) d, (const mbedtls_mpi *) tmp, (const mbedtls_mpi *) c) < 0) {
goto fail;
}
ret = 0;
fail:
crypto_bignum_deinit(tmp, 0);
return ret;
}
void crypto_free_buffer(unsigned char *buf)
{
os_free(buf);
}
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