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components/wpa_supplicant/esp_supplicant/src/crypto/crypto_mbedtls.c
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/*
* SPDX-FileCopyrightText: 2020-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifdef ESP_PLATFORM
#include "esp_system.h"
#endif
#include "utils/includes.h"
#include "utils/common.h"
#include "crypto.h"
#include "random.h"
#include "sha256.h"
#include "mbedtls/ecp.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/md.h"
#include "mbedtls/aes.h"
#include "mbedtls/bignum.h"
#include "mbedtls/pkcs5.h"
#include "mbedtls/cmac.h"
#include "mbedtls/nist_kw.h"
#include "mbedtls/des.h"
#include "mbedtls/ccm.h"
#include "common.h"
#include "utils/wpabuf.h"
#include "dh_group5.h"
#include "md5.h"
#include "sha1.h"
#include "sha256.h"
#include "sha384.h"
#include "aes_wrap.h"
#include "crypto.h"
#include "mbedtls/esp_config.h"
#ifdef CONFIG_FAST_PBKDF2
#include "fastpbkdf2.h"
#endif
static int digest_vector(mbedtls_md_type_t md_type, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
size_t i;
const mbedtls_md_info_t *md_info;
mbedtls_md_context_t md_ctx;
int ret;
mbedtls_md_init(&md_ctx);
md_info = mbedtls_md_info_from_type(md_type);
if (!md_info) {
wpa_printf(MSG_ERROR, "mbedtls_md_info_from_type() failed");
return -1;
}
ret = mbedtls_md_setup(&md_ctx, md_info, 0);
if (ret != 0) {
wpa_printf(MSG_ERROR, "mbedtls_md_setup() returned error");
goto cleanup;
}
ret = mbedtls_md_starts(&md_ctx);
if (ret != 0) {
wpa_printf(MSG_ERROR, "mbedtls_md_starts returned error");
goto cleanup;
}
for (i = 0; i < num_elem; i++) {
ret = mbedtls_md_update(&md_ctx, addr[i], len[i]);
if (ret != 0) {
wpa_printf(MSG_ERROR, "mbedtls_md_update ret=%d", ret);
goto cleanup;
}
}
ret = mbedtls_md_finish(&md_ctx, mac);
cleanup:
mbedtls_md_free(&md_ctx);
return ret;
}
int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len,
u8 *mac)
{
return digest_vector(MBEDTLS_MD_SHA256, num_elem, addr, len, mac);
}
int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len,
u8 *mac)
{
return digest_vector(MBEDTLS_MD_SHA384, num_elem, addr, len, mac);
}
int sha512_vector(size_t num_elem, const u8 *addr[], const size_t *len,
u8 *mac)
{
return digest_vector(MBEDTLS_MD_SHA512, num_elem, addr, len, mac);
}
int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return digest_vector(MBEDTLS_MD_SHA1, num_elem, addr, len, mac);
}
int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return digest_vector(MBEDTLS_MD_MD5, num_elem, addr, len, mac);
}
#ifdef MBEDTLS_MD4_C
int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return digest_vector(MBEDTLS_MD_MD4, num_elem, addr, len, mac);
}
#endif
struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
size_t key_len)
{
mbedtls_md_context_t *ctx = NULL;
mbedtls_md_type_t md_type;
const mbedtls_md_info_t *md_info;
int ret;
int is_hmac = 0;
switch (alg) {
case CRYPTO_HASH_ALG_MD5:
case CRYPTO_HASH_ALG_HMAC_MD5:
md_type = MBEDTLS_MD_MD5;
break;
case CRYPTO_HASH_ALG_SHA1:
case CRYPTO_HASH_ALG_HMAC_SHA1:
md_type = MBEDTLS_MD_SHA1;
break;
case CRYPTO_HASH_ALG_SHA256:
case CRYPTO_HASH_ALG_HMAC_SHA256:
md_type = MBEDTLS_MD_SHA256;
break;
case CRYPTO_HASH_ALG_SHA384:
md_type = MBEDTLS_MD_SHA384;
break;
case CRYPTO_HASH_ALG_SHA512:
md_type = MBEDTLS_MD_SHA512;
break;
default:
return NULL;
}
switch (alg) {
case CRYPTO_HASH_ALG_HMAC_MD5:
case CRYPTO_HASH_ALG_HMAC_SHA1:
case CRYPTO_HASH_ALG_HMAC_SHA256:
is_hmac = 1;
break;
default:
break;
}
ctx = os_zalloc(sizeof(*ctx));
if (ctx == NULL) {
return NULL;
}
mbedtls_md_init(ctx);
md_info = mbedtls_md_info_from_type(md_type);
if (!md_info) {
goto cleanup;
}
if (mbedtls_md_setup(ctx, md_info, is_hmac) != 0) {
goto cleanup;
}
if (is_hmac) {
ret = mbedtls_md_hmac_starts(ctx, key, key_len);
} else {
ret = mbedtls_md_starts(ctx);
}
if (ret < 0) {
goto cleanup;
}
return (struct crypto_hash *)ctx;
cleanup:
mbedtls_md_free(ctx);
os_free(ctx);
return NULL;
}
void crypto_hash_update(struct crypto_hash *crypto_ctx, const u8 *data, size_t len)
{
int ret;
mbedtls_md_context_t *ctx = (mbedtls_md_context_t *)crypto_ctx;
if (ctx == NULL) {
return;
}
if (ctx->MBEDTLS_PRIVATE(hmac_ctx)) {
ret = mbedtls_md_hmac_update(ctx, data, len);
} else {
ret = mbedtls_md_update(ctx, data, len);
}
if (ret != 0) {
wpa_printf(MSG_ERROR, "%s: mbedtls_md_hmac_update failed", __func__);
}
}
int crypto_hash_finish(struct crypto_hash *crypto_ctx, u8 *mac, size_t *len)
{
int ret = 0;
mbedtls_md_type_t md_type;
mbedtls_md_context_t *ctx = (mbedtls_md_context_t *)crypto_ctx;
if (ctx == NULL) {
return -2;
}
if (mac == NULL || len == NULL) {
goto err;
}
md_type = mbedtls_md_get_type(mbedtls_md_info_from_ctx(ctx));
switch (md_type) {
case MBEDTLS_MD_MD5:
if (*len < MD5_MAC_LEN) {
*len = MD5_MAC_LEN;
ret = -1;
goto err;
}
*len = MD5_MAC_LEN;
break;
case MBEDTLS_MD_SHA1:
if (*len < SHA1_MAC_LEN) {
*len = SHA1_MAC_LEN;
ret = -1;
goto err;
}
*len = SHA1_MAC_LEN;
break;
case MBEDTLS_MD_SHA256:
if (*len < SHA256_MAC_LEN) {
*len = SHA256_MAC_LEN;
ret = -1;
goto err;
}
*len = SHA256_MAC_LEN;
break;
case MBEDTLS_MD_SHA384:
if (*len < SHA384_MAC_LEN) {
*len = SHA384_MAC_LEN;
ret = -1;
goto err;
}
*len = SHA384_MAC_LEN;
break;
case MBEDTLS_MD_SHA512:
if (*len < SHA512_MAC_LEN) {
*len = SHA512_MAC_LEN;
ret = -1;
goto err;
}
*len = SHA512_MAC_LEN;
break;
default:
*len = 0;
ret = -1;
goto err;
}
if (ctx->MBEDTLS_PRIVATE(hmac_ctx)) {
ret = mbedtls_md_hmac_finish(ctx, mac);
} else {
ret = mbedtls_md_finish(ctx, mac);
}
err:
mbedtls_md_free(ctx);
bin_clear_free(ctx, sizeof(*ctx));
return ret;
}
static int hmac_vector(mbedtls_md_type_t md_type,
const u8 *key, size_t key_len,
size_t num_elem, const u8 *addr[],
const size_t *len, u8 *mac)
{
size_t i;
const mbedtls_md_info_t *md_info;
mbedtls_md_context_t md_ctx;
int ret;
mbedtls_md_init(&md_ctx);
md_info = mbedtls_md_info_from_type(md_type);
if (!md_info) {
return -1;
}
ret = mbedtls_md_setup(&md_ctx, md_info, 1);
if (ret != 0) {
return (ret);
}
ret = mbedtls_md_hmac_starts(&md_ctx, key, key_len);
if (ret != 0) {
return (ret);
}
for (i = 0; i < num_elem; i++) {
ret = mbedtls_md_hmac_update(&md_ctx, addr[i], len[i]);
if (ret != 0) {
return (ret);
}
}
ret = mbedtls_md_hmac_finish(&md_ctx, mac);
mbedtls_md_free(&md_ctx);
return ret;
}
int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return hmac_vector(MBEDTLS_MD_SHA384, key, key_len, num_elem, addr,
len, mac);
}
int hmac_sha384(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *mac)
{
return hmac_sha384_vector(key, key_len, 1, &data, &data_len, mac);
}
int hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return hmac_vector(MBEDTLS_MD_SHA256, key, key_len, num_elem, addr,
len, mac);
}
int hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *mac)
{
return hmac_sha256_vector(key, key_len, 1, &data, &data_len, mac);
}
int hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return hmac_vector(MBEDTLS_MD_MD5, key, key_len,
num_elem, addr, len, mac);
}
int hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
u8 *mac)
{
return hmac_md5_vector(key, key_len, 1, &data, &data_len, mac);
}
int hmac_sha1_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return hmac_vector(MBEDTLS_MD_SHA1, key, key_len, num_elem, addr,
len, mac);
}
int hmac_sha1(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
u8 *mac)
{
return hmac_sha1_vector(key, key_len, 1, &data, &data_len, mac);
}
static void *aes_crypt_init(int mode, const u8 *key, size_t len)
{
int ret = -1;
mbedtls_aes_context *aes = os_malloc(sizeof(*aes));
if (!aes) {
return NULL;
}
mbedtls_aes_init(aes);
if (mode == MBEDTLS_AES_ENCRYPT) {
ret = mbedtls_aes_setkey_enc(aes, key, len * 8);
} else if (mode == MBEDTLS_AES_DECRYPT) {
ret = mbedtls_aes_setkey_dec(aes, key, len * 8);
}
if (ret < 0) {
mbedtls_aes_free(aes);
os_free(aes);
wpa_printf(MSG_ERROR, "%s: mbedtls_aes_setkey_enc/mbedtls_aes_setkey_dec failed", __func__);
return NULL;
}
return (void *) aes;
}
static int aes_crypt(void *ctx, int mode, const u8 *in, u8 *out)
{
return mbedtls_aes_crypt_ecb((mbedtls_aes_context *)ctx,
mode, in, out);
}
static void aes_crypt_deinit(void *ctx)
{
mbedtls_aes_free((mbedtls_aes_context *)ctx);
os_free(ctx);
}
void *aes_encrypt_init(const u8 *key, size_t len)
{
return aes_crypt_init(MBEDTLS_AES_ENCRYPT, key, len);
}
int aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
{
return aes_crypt(ctx, MBEDTLS_AES_ENCRYPT, plain, crypt);
}
void aes_encrypt_deinit(void *ctx)
{
return aes_crypt_deinit(ctx);
}
void * aes_decrypt_init(const u8 *key, size_t len)
{
return aes_crypt_init(MBEDTLS_AES_DECRYPT, key, len);
}
int aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
{
return aes_crypt(ctx, MBEDTLS_AES_DECRYPT, crypt, plain);
}
void aes_decrypt_deinit(void *ctx)
{
return aes_crypt_deinit(ctx);
}
int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
{
int ret = 0;
mbedtls_aes_context ctx;
u8 cbc[MBEDTLS_AES_BLOCK_SIZE];
mbedtls_aes_init(&ctx);
ret = mbedtls_aes_setkey_enc(&ctx, key, 128);
if (ret < 0) {
mbedtls_aes_free(&ctx);
return ret;
}
os_memcpy(cbc, iv, MBEDTLS_AES_BLOCK_SIZE);
ret = mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_ENCRYPT,
data_len, cbc, data, data);
mbedtls_aes_free(&ctx);
return ret;
}
int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
{
int ret = 0;
mbedtls_aes_context ctx;
u8 cbc[MBEDTLS_AES_BLOCK_SIZE];
mbedtls_aes_init(&ctx);
ret = mbedtls_aes_setkey_dec(&ctx, key, 128);
if (ret < 0) {
mbedtls_aes_free(&ctx);
return ret;
}
os_memcpy(cbc, iv, MBEDTLS_AES_BLOCK_SIZE);
ret = mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_DECRYPT,
data_len, cbc, data, data);
mbedtls_aes_free(&ctx);
return ret;
}
#ifdef CONFIG_TLS_INTERNAL_CLIENT
struct crypto_cipher {
mbedtls_cipher_context_t ctx_enc;
mbedtls_cipher_context_t ctx_dec;
};
static int crypto_init_cipher_ctx(mbedtls_cipher_context_t *ctx,
const mbedtls_cipher_info_t *cipher_info,
const u8 *iv, const u8 *key, size_t key_len,
mbedtls_operation_t operation)
{
mbedtls_cipher_init(ctx);
int ret;
ret = mbedtls_cipher_setup(ctx, cipher_info);
if (ret != 0) {
return -1;
}
ret = mbedtls_cipher_setkey(ctx, key, key_len * 8, operation);
if (ret != 0) {
wpa_printf(MSG_ERROR, "mbedtls_cipher_setkey returned error=%d", ret);
return -1;
}
ret = mbedtls_cipher_set_iv(ctx, iv, cipher_info->MBEDTLS_PRIVATE(iv_size) << MBEDTLS_IV_SIZE_SHIFT);
if (ret != 0) {
wpa_printf(MSG_ERROR, "mbedtls_cipher_set_iv returned error=%d", ret);
return -1;
}
ret = mbedtls_cipher_reset(ctx);
if (ret != 0) {
wpa_printf(MSG_ERROR, "mbedtls_cipher_reset() returned error=%d", ret);
return -1;
}
return 0;
}
static mbedtls_cipher_type_t alg_to_mbedtls_cipher(enum crypto_cipher_alg alg,
size_t key_len)
{
switch (alg) {
case CRYPTO_CIPHER_ALG_AES:
if (key_len == 16) {
return MBEDTLS_CIPHER_AES_128_CBC;
}
if (key_len == 24) {
return MBEDTLS_CIPHER_AES_192_CBC;
}
if (key_len == 32) {
return MBEDTLS_CIPHER_AES_256_CBC;
}
break;
#ifdef MBEDTLS_DES_C
case CRYPTO_CIPHER_ALG_3DES:
return MBEDTLS_CIPHER_DES_EDE3_CBC;
case CRYPTO_CIPHER_ALG_DES:
return MBEDTLS_CIPHER_DES_CBC;
#endif
default:
break;
}
return MBEDTLS_CIPHER_NONE;
}
struct crypto_cipher *crypto_cipher_init(enum crypto_cipher_alg alg,
const u8 *iv, const u8 *key,
size_t key_len)
{
struct crypto_cipher *ctx;
mbedtls_cipher_type_t cipher_type;
const mbedtls_cipher_info_t *cipher_info;
ctx = (struct crypto_cipher *)os_zalloc(sizeof(*ctx));
if (!ctx) {
return NULL;
}
cipher_type = alg_to_mbedtls_cipher(alg, key_len);
if (cipher_type == MBEDTLS_CIPHER_NONE) {
goto cleanup;
}
cipher_info = mbedtls_cipher_info_from_type(cipher_type);
if (cipher_info == NULL) {
goto cleanup;
}
/* Init both ctx encryption/decryption */
if (crypto_init_cipher_ctx(&ctx->ctx_enc, cipher_info, iv, key,
key_len, MBEDTLS_ENCRYPT) < 0) {
goto cleanup;
}
if (crypto_init_cipher_ctx(&ctx->ctx_dec, cipher_info, iv, key,
key_len, MBEDTLS_DECRYPT) < 0) {
goto cleanup;
}
if (mbedtls_cipher_set_padding_mode(&ctx->ctx_enc, MBEDTLS_PADDING_NONE) < 0) {
goto cleanup;
}
if (mbedtls_cipher_set_padding_mode(&ctx->ctx_dec, MBEDTLS_PADDING_NONE) < 0) {
goto cleanup;
}
return ctx;
cleanup:
os_free(ctx);
return NULL;
}
int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
u8 *crypt, size_t len)
{
int ret;
size_t olen = 0;
ret = mbedtls_cipher_update(&ctx->ctx_enc, plain, len, crypt, &olen);
if (ret != 0) {
return -1;
}
ret = mbedtls_cipher_finish(&ctx->ctx_enc, crypt + olen, &olen);
if (ret != 0) {
return -1;
}
return 0;
}
int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
u8 *plain, size_t len)
{
int ret;
size_t olen = 0;
ret = mbedtls_cipher_update(&ctx->ctx_dec, crypt, len, plain, &olen);
if (ret != 0) {
return -1;
}
ret = mbedtls_cipher_finish(&ctx->ctx_dec, plain + olen, &olen);
if (ret != 0) {
return -1;
}
return 0;
}
void crypto_cipher_deinit(struct crypto_cipher *ctx)
{
mbedtls_cipher_free(&ctx->ctx_enc);
mbedtls_cipher_free(&ctx->ctx_dec);
os_free(ctx);
}
#endif
int aes_ctr_encrypt(const u8 *key, size_t key_len, const u8 *nonce,
u8 *data, size_t data_len)
{
int ret;
mbedtls_aes_context ctx;
uint8_t stream_block[MBEDTLS_AES_BLOCK_SIZE];
size_t offset = 0;
mbedtls_aes_init(&ctx);
ret = mbedtls_aes_setkey_enc(&ctx, key, key_len * 8);
if (ret < 0) {
goto cleanup;
}
ret = mbedtls_aes_crypt_ctr(&ctx, data_len, &offset, (u8 *)nonce,
stream_block, data, data);
cleanup:
mbedtls_aes_free(&ctx);
return ret;
}
int aes_128_ctr_encrypt(const u8 *key, const u8 *nonce,
u8 *data, size_t data_len)
{
return aes_ctr_encrypt(key, 16, nonce, data, data_len);
}
#ifdef MBEDTLS_NIST_KW_C
int aes_wrap(const u8 *kek, size_t kek_len, int n, const u8 *plain, u8 *cipher)
{
mbedtls_nist_kw_context ctx;
size_t olen;
int ret = 0;
mbedtls_nist_kw_init(&ctx);
ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES,
kek, kek_len * 8, 1);
if (ret != 0) {
return ret;
}
ret = mbedtls_nist_kw_wrap(&ctx, MBEDTLS_KW_MODE_KW, plain,
n * 8, cipher, &olen, (n + 1) * 8);
mbedtls_nist_kw_free(&ctx);
return ret;
}
int aes_unwrap(const u8 *kek, size_t kek_len, int n, const u8 *cipher,
u8 *plain)
{
mbedtls_nist_kw_context ctx;
size_t olen;
int ret = 0;
mbedtls_nist_kw_init(&ctx);
ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES,
kek, kek_len * 8, 0);
if (ret != 0) {
return ret;
}
ret = mbedtls_nist_kw_unwrap(&ctx, MBEDTLS_KW_MODE_KW, cipher,
(n + 1) * 8, plain, &olen, (n * 8));
mbedtls_nist_kw_free(&ctx);
return ret;
}
#endif
int crypto_mod_exp(const uint8_t *base, size_t base_len,
const uint8_t *power, size_t power_len,
const uint8_t *modulus, size_t modulus_len,
uint8_t *result, size_t *result_len)
{
mbedtls_mpi bn_base, bn_exp, bn_modulus, bn_result, bn_rinv;
int ret = 0;
mbedtls_mpi_init(&bn_base);
mbedtls_mpi_init(&bn_exp);
mbedtls_mpi_init(&bn_modulus);
mbedtls_mpi_init(&bn_result);
mbedtls_mpi_init(&bn_rinv);
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&bn_base, base, base_len));
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&bn_exp, power, power_len));
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&bn_modulus, modulus, modulus_len));
MBEDTLS_MPI_CHK(mbedtls_mpi_exp_mod(&bn_result, &bn_base, &bn_exp, &bn_modulus,
&bn_rinv));
ret = mbedtls_mpi_write_binary(&bn_result, result, *result_len);
cleanup:
mbedtls_mpi_free(&bn_base);
mbedtls_mpi_free(&bn_exp);
mbedtls_mpi_free(&bn_modulus);
mbedtls_mpi_free(&bn_result);
mbedtls_mpi_free(&bn_rinv);
return ret;
}
int pbkdf2_sha1(const char *passphrase, const u8 *ssid, size_t ssid_len,
int iterations, u8 *buf, size_t buflen)
{
#ifdef CONFIG_FAST_PBKDF2
fastpbkdf2_hmac_sha1((const u8 *) passphrase, os_strlen(passphrase),
ssid, ssid_len, iterations, buf, buflen);
return 0;
#else
int ret = mbedtls_pkcs5_pbkdf2_hmac_ext(MBEDTLS_MD_SHA1, (const u8 *) passphrase,
os_strlen(passphrase), ssid,
ssid_len, iterations, buflen, buf);
if (ret != 0) {
ret = -1;
goto cleanup;
}
cleanup:
return ret;
#endif
}
#ifdef MBEDTLS_DES_C
int des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
{
int ret;
mbedtls_des_context des;
u8 pkey[8], next, tmp;
int i;
/* Add parity bits to the key */
next = 0;
for (i = 0; i < 7; i++) {
tmp = key[i];
pkey[i] = (tmp >> i) | next | 1;
next = tmp << (7 - i);
}
pkey[i] = next | 1;
mbedtls_des_init(&des);
ret = mbedtls_des_setkey_enc(&des, pkey);
if (ret < 0) {
return ret;
}
ret = mbedtls_des_crypt_ecb(&des, clear, cypher);
mbedtls_des_free(&des);
return ret;
}
#endif
/* Only enable this if all other ciphers are using MbedTLS implementation */
#if defined(MBEDTLS_CCM_C) && defined(MBEDTLS_CMAC_C) && defined(MBEDTLS_NIST_KW_C)
int aes_ccm_ae(const u8 *key, size_t key_len, const u8 *nonce,
size_t M, const u8 *plain, size_t plain_len,
const u8 *aad, size_t aad_len, u8 *crypt, u8 *auth)
{
int ret;
mbedtls_ccm_context ccm;
mbedtls_ccm_init(&ccm);
ret = mbedtls_ccm_setkey(&ccm, MBEDTLS_CIPHER_ID_AES,
key, key_len * 8);
if (ret < 0) {
wpa_printf(MSG_ERROR, "mbedtls_ccm_setkey failed");
goto cleanup;
}
ret = mbedtls_ccm_encrypt_and_tag(&ccm, plain_len, nonce, 13, aad,
aad_len, plain, crypt, auth, M);
cleanup:
mbedtls_ccm_free(&ccm);
return ret;
}
int aes_ccm_ad(const u8 *key, size_t key_len, const u8 *nonce,
size_t M, const u8 *crypt, size_t crypt_len,
const u8 *aad, size_t aad_len, const u8 *auth,
u8 *plain)
{
int ret;
mbedtls_ccm_context ccm;
mbedtls_ccm_init(&ccm);
ret = mbedtls_ccm_setkey(&ccm, MBEDTLS_CIPHER_ID_AES,
key, key_len * 8);
if (ret < 0) {
goto cleanup;;
}
ret = mbedtls_ccm_star_auth_decrypt(&ccm, crypt_len,
nonce, 13, aad, aad_len,
crypt, plain, auth, M);
cleanup:
mbedtls_ccm_free(&ccm);
return ret;
}
#endif
#ifdef MBEDTLS_CMAC_C
int omac1_aes_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
const mbedtls_cipher_info_t *cipher_info;
int i, ret = 0;
mbedtls_cipher_type_t cipher_type;
mbedtls_cipher_context_t ctx;
switch (key_len) {
case 16:
cipher_type = MBEDTLS_CIPHER_AES_128_ECB;
break;
case 24:
cipher_type = MBEDTLS_CIPHER_AES_192_ECB;
break;
case 32:
cipher_type = MBEDTLS_CIPHER_AES_256_ECB;
break;
default:
cipher_type = MBEDTLS_CIPHER_NONE;
break;
}
cipher_info = mbedtls_cipher_info_from_type(cipher_type);
if (cipher_info == NULL) {
/* Failing at this point must be due to a build issue */
ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
goto cleanup;
}
if (key == NULL || mac == NULL) {
return -1;
}
mbedtls_cipher_init(&ctx);
ret = mbedtls_cipher_setup(&ctx, cipher_info);
if (ret != 0) {
goto cleanup;
}
ret = mbedtls_cipher_cmac_starts(&ctx, key, key_len * 8);
if (ret != 0) {
goto cleanup;
}
for (i = 0 ; i < num_elem; i++) {
ret = mbedtls_cipher_cmac_update(&ctx, addr[i], len[i]);
if (ret != 0) {
goto cleanup;
}
}
ret = mbedtls_cipher_cmac_finish(&ctx, mac);
cleanup:
mbedtls_cipher_free(&ctx);
return (ret);
}
int omac1_aes_128_vector(const u8 *key, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return omac1_aes_vector(key, 16, num_elem, addr, len, mac);
}
int omac1_aes_128(const u8 *key, const u8 *data, size_t data_len, u8 *mac)
{
return omac1_aes_128_vector(key, 1, &data, &data_len, mac);
}
#endif
int crypto_dh_init(u8 generator, const u8 *prime, size_t prime_len, u8 *privkey,
u8 *pubkey)
{
size_t pubkey_len, pad;
if (os_get_random(privkey, prime_len) < 0) {
return -1;
}
if (os_memcmp(privkey, prime, prime_len) > 0) {
/* Make sure private value is smaller than prime */
privkey[0] = 0;
}
pubkey_len = prime_len;
if (crypto_mod_exp(&generator, 1, privkey, prime_len, prime, prime_len,
pubkey, &pubkey_len) < 0) {
return -1;
}
if (pubkey_len < prime_len) {
pad = prime_len - pubkey_len;
os_memmove(pubkey + pad, pubkey, pubkey_len);
os_memset(pubkey, 0, pad);
}
return 0;
}
int crypto_global_init(void)
{
return 0;
}
void crypto_global_deinit(void)
{
}
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