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components/wpa_supplicant/esp_supplicant/src/crypto/crypto_mbedtls-rsa.c
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/*
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifdef ESP_PLATFORM
#include "mbedtls/bignum.h"
#endif
#include "utils/includes.h"
#include "utils/common.h"
#include "crypto.h"
#include "common/defs.h"
#ifdef CONFIG_CRYPTO_MBEDTLS
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include <mbedtls/error.h>
#include <mbedtls/x509_crt.h>
#include <mbedtls/platform.h>
#include <mbedtls/sha256.h>
/* Dummy structures; these are just typecast to struct crypto_rsa_key */
struct crypto_public_key;
struct crypto_private_key;
#ifdef DEBUG_PRINT
static void crypto_dump_verify_info(u32 flags)
{
char dump_buffer[1024];
mbedtls_x509_crt_verify_info(dump_buffer, 1024, " ! ", flags);
wpa_printf(MSG_ERROR, "%s", dump_buffer);
}
#else
static void crypto_dump_verify_info(u32 flags) { }
#endif
static int crypto_rng_wrapper(void *ctx, unsigned char *buf, size_t len)
{
return os_get_random(buf, len);
}
int crypto_verify_cert(const u8 *cert_start, int certlen, const u8 *ca_cert_start, int ca_certlen)
{
int ret;
u32 flags = 0;
mbedtls_x509_crt *cert = os_zalloc(sizeof(mbedtls_x509_crt));
mbedtls_x509_crt *ca_cert = os_zalloc(sizeof(mbedtls_x509_crt));
if (!cert || !ca_cert) {
if (cert) {
os_free(cert);
}
if (ca_cert) {
os_free(ca_cert);
}
wpa_printf(MSG_ERROR, "%s: memory allocation failed", __func__);
return -1;
}
mbedtls_x509_crt_init(cert);
mbedtls_x509_crt_init(ca_cert);
ret = mbedtls_x509_crt_parse(cert, cert_start, certlen);
if (ret < 0) {
wpa_printf(MSG_ERROR, "peer cert parsing failed");
goto cleanup;
}
ret = mbedtls_x509_crt_parse(ca_cert, ca_cert_start, ca_certlen);
if (ret < 0) {
wpa_printf(MSG_ERROR, "CA cert parsing failed");
goto cleanup;
}
ret = mbedtls_x509_crt_verify(cert, ca_cert, NULL, NULL, &flags, NULL, NULL);
/* Certification is failed, try to get some more info */
if (ret != 0) {
crypto_dump_verify_info(flags);
}
cleanup:
mbedtls_x509_crt_free(cert);
mbedtls_x509_crt_free(ca_cert);
os_free(cert);
os_free(ca_cert);
return ret;
}
struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
{
int ret;
mbedtls_pk_context *pkey = os_zalloc(sizeof(*pkey));
if (!pkey) {
return NULL;
}
mbedtls_pk_init(pkey);
ret = mbedtls_pk_parse_public_key(pkey, key, len);
if (ret < 0) {
wpa_printf(MSG_ERROR, "failed to parse public key");
os_free(pkey);
return NULL;
}
return (struct crypto_public_key *)pkey;
}
struct crypto_private_key * crypto_private_key_import(const u8 *key,
size_t len,
const char *passwd)
{
int ret;
mbedtls_pk_context *pkey = os_zalloc(sizeof(mbedtls_pk_context));
if (!pkey) {
return NULL;
}
mbedtls_pk_init(pkey);
ret = mbedtls_pk_parse_key(pkey, key, len, (const unsigned char *)passwd,
passwd ? os_strlen(passwd) : 0, crypto_rng_wrapper, NULL);
if (ret < 0) {
wpa_printf(MSG_ERROR, "failed to parse private key");
os_free(pkey);
pkey = NULL;
}
return (struct crypto_private_key *)pkey;
}
struct crypto_public_key *crypto_public_key_from_cert(const u8 *buf,
size_t len)
{
int ret;
mbedtls_x509_crt *cert;
mbedtls_pk_context *kctx = os_zalloc(sizeof(*kctx));
if (!kctx) {
wpa_printf(MSG_ERROR, "failed to allocate memory");
return NULL;
}
cert = os_zalloc(sizeof(mbedtls_x509_crt));
if (!cert) {
wpa_printf(MSG_ERROR, "failed to allocate memory");
goto fail;
}
mbedtls_x509_crt_init(cert);
ret = mbedtls_x509_crt_parse(cert, buf, len);
if (ret < 0) {
wpa_printf(MSG_ERROR, "cert parsing failed");
goto fail;
}
mbedtls_pk_init(kctx);
if (mbedtls_pk_setup(kctx, mbedtls_pk_info_from_type(mbedtls_pk_get_type(&cert->pk))) != 0) {
wpa_printf(MSG_ERROR, "key setup failed");
goto fail;
}
ret = mbedtls_rsa_copy(mbedtls_pk_rsa(*kctx), mbedtls_pk_rsa(cert->pk));
if (ret < 0) {
wpa_printf(MSG_ERROR, "key copy failed");
goto fail;
}
cleanup:
mbedtls_x509_crt_free(cert);
os_free(cert);
return (struct crypto_public_key *)kctx;
fail:
os_free(kctx);
kctx = NULL;
goto cleanup;
}
int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
const u8 *in, size_t inlen,
u8 *out, size_t *outlen)
{
int ret;
mbedtls_pk_context *pkey = (mbedtls_pk_context *)key;
const char *pers = "rsa_encrypt";
mbedtls_entropy_context *entropy = os_zalloc(sizeof(*entropy));
mbedtls_ctr_drbg_context *ctr_drbg = os_zalloc(sizeof(*ctr_drbg));
if (!pkey || !entropy || !ctr_drbg) {
if (entropy) {
os_free(entropy);
}
if (ctr_drbg) {
os_free(ctr_drbg);
}
wpa_printf(MSG_ERROR, "failed to allocate memory");
return -1;
}
mbedtls_entropy_init(entropy);
mbedtls_ctr_drbg_init(ctr_drbg);
ret = mbedtls_ctr_drbg_seed(ctr_drbg, mbedtls_entropy_func,
entropy, (const unsigned char *) pers,
strlen(pers));
if (ret != 0) {
wpa_printf(MSG_ERROR, " failed ! mbedtls_ctr_drbg_seed returned %d",
ret);
goto cleanup;
}
ret = mbedtls_rsa_pkcs1_encrypt(mbedtls_pk_rsa(*pkey), mbedtls_ctr_drbg_random,
ctr_drbg, inlen, in, out);
if (ret != 0) {
wpa_printf(MSG_ERROR, " failed ! mbedtls_rsa_pkcs1_encrypt returned -0x%04x", -ret);
goto cleanup;
}
*outlen = mbedtls_rsa_get_len(mbedtls_pk_rsa(*pkey));
cleanup:
mbedtls_ctr_drbg_free(ctr_drbg);
mbedtls_entropy_free(entropy);
os_free(entropy);
os_free(ctr_drbg);
return ret;
}
int crypto_private_key_decrypt_pkcs1_v15(struct crypto_private_key *key,
const u8 *in, size_t inlen,
u8 *out, size_t *outlen)
{
int ret;
size_t i;
mbedtls_pk_context *pkey = (mbedtls_pk_context *)key;
const char *pers = "rsa_decrypt";
mbedtls_entropy_context *entropy = os_malloc(sizeof(*entropy));
mbedtls_ctr_drbg_context *ctr_drbg = os_malloc(sizeof(*ctr_drbg));
if (!pkey || !entropy || !ctr_drbg) {
if (entropy) {
os_free(entropy);
}
if (ctr_drbg) {
os_free(ctr_drbg);
}
return -1;
}
mbedtls_ctr_drbg_init(ctr_drbg);
mbedtls_entropy_init(entropy);
ret = mbedtls_ctr_drbg_seed(ctr_drbg, mbedtls_entropy_func,
entropy, (const unsigned char *) pers,
strlen(pers));
if (ret < 0) {
goto cleanup;
}
i = mbedtls_rsa_get_len(mbedtls_pk_rsa(*pkey));
ret = mbedtls_rsa_rsaes_pkcs1_v15_decrypt(mbedtls_pk_rsa(*pkey), mbedtls_ctr_drbg_random,
ctr_drbg, &i, in, out, *outlen);
*outlen = i;
cleanup:
mbedtls_ctr_drbg_free(ctr_drbg);
mbedtls_entropy_free(entropy);
os_free(entropy);
os_free(ctr_drbg);
return ret;
}
int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
const u8 *in, size_t inlen,
u8 *out, size_t *outlen)
{
int ret;
const char *pers = "rsa_encrypt";
mbedtls_pk_context *pkey = (mbedtls_pk_context *)key;
mbedtls_entropy_context *entropy = os_malloc(sizeof(*entropy));
mbedtls_ctr_drbg_context *ctr_drbg = os_malloc(sizeof(*ctr_drbg));
if (!pkey || !entropy || !ctr_drbg) {
if (entropy) {
os_free(entropy);
}
if (ctr_drbg) {
os_free(ctr_drbg);
}
return -1;
}
mbedtls_ctr_drbg_init(ctr_drbg);
mbedtls_entropy_init(entropy);
ret = mbedtls_ctr_drbg_seed(ctr_drbg, mbedtls_entropy_func,
entropy, (const unsigned char *) pers,
strlen(pers));
if ((ret = mbedtls_rsa_pkcs1_sign(mbedtls_pk_rsa(*pkey), mbedtls_ctr_drbg_random, ctr_drbg,
(mbedtls_pk_rsa(*pkey))->MBEDTLS_PRIVATE(hash_id),
inlen, in, out)) != 0) {
wpa_printf(MSG_ERROR, " failed ! mbedtls_rsa_pkcs1_sign returned %d", ret);
goto cleanup;
}
*outlen = mbedtls_rsa_get_len(mbedtls_pk_rsa(*pkey));
cleanup:
mbedtls_ctr_drbg_free(ctr_drbg);
mbedtls_entropy_free(entropy);
os_free(entropy);
os_free(ctr_drbg);
return ret;
}
void crypto_public_key_free(struct crypto_public_key *key)
{
mbedtls_pk_context *pkey = (mbedtls_pk_context *)key;
if (!pkey) {
return;
}
mbedtls_pk_free(pkey);
os_free(pkey);
}
void crypto_private_key_free(struct crypto_private_key *key)
{
mbedtls_pk_context *pkey = (mbedtls_pk_context *)key;
if (!pkey) {
return;
}
mbedtls_pk_free(pkey);
os_free(pkey);
}
int crypto_public_key_decrypt_pkcs1(struct crypto_public_key *key,
const u8 *crypt, size_t crypt_len,
u8 *plain, size_t *plain_len)
{
size_t len;
u8 *pos;
mbedtls_pk_context *pkey = (mbedtls_pk_context *)key;
len = mbedtls_pk_rsa(*pkey)->MBEDTLS_PRIVATE(len);
if (len != crypt_len) {
return -1;
}
if (mbedtls_rsa_public(mbedtls_pk_rsa(*pkey), crypt, plain) < 0) {
return -1;
}
/*
* PKCS #1 v1.5, 8.1:
*
* EB = 00 || BT || PS || 00 || D
* BT = 00 or 01
* PS = k-3-||D|| times (00 if BT=00) or (FF if BT=01)
* k = length of modulus in octets
*
* Based on 10.1.3, "The block type shall be 01" for a signature.
*/
if (len < 3 + 8 + 16 /* min hash len */ ||
plain[0] != 0x00 || plain[1] != 0x01) {
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
"structure");
wpa_hexdump_key(MSG_DEBUG, "Signature EB", plain, len);
return -1;
}
pos = plain + 3;
/* BT = 01 */
if (plain[2] != 0xff) {
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature "
"PS (BT=01)");
wpa_hexdump_key(MSG_DEBUG, "Signature EB", plain, len);
return -1;
}
while (pos < plain + len && *pos == 0xff) {
pos++;
}
if (pos - plain - 2 < 8) {
/* PKCS #1 v1.5, 8.1: At least eight octets long PS */
wpa_printf(MSG_INFO, "LibTomCrypt: Too short signature "
"padding");
wpa_hexdump_key(MSG_DEBUG, "Signature EB", plain, len);
return -1;
}
if (pos + 16 /* min hash len */ >= plain + len || *pos != 0x00) {
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
"structure (2)");
wpa_hexdump_key(MSG_DEBUG, "Signature EB", plain, len);
return -1;
}
pos++;
len -= pos - plain;
/* Strip PKCS #1 header */
os_memmove(plain, pos, len);
*plain_len = len;
return 0;
}
#endif
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