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- /**
- * Copyright (c) 2018 - 2020, Nordic Semiconductor ASA
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form, except as embedded into a Nordic
- * Semiconductor ASA integrated circuit in a product or a software update for
- * such product, must reproduce the above copyright notice, this list of
- * conditions and the following disclaimer in the documentation and/or other
- * materials provided with the distribution.
- *
- * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * 4. This software, with or without modification, must only be used with a
- * Nordic Semiconductor ASA integrated circuit.
- *
- * 5. Any software provided in binary form under this license must not be reverse
- * engineered, decompiled, modified and/or disassembled.
- *
- * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
- * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
- * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include "sdk_config.h"
- #include "nordic_common.h"
- #if NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON)
- #include <stdbool.h>
- #include <string.h>
- #include <stddef.h>
- #include "app_util.h"
- #include "nrf_crypto_ecc.h"
- #include "nrf_crypto_mem.h"
- #include "nrf_crypto_rng.h"
- #include "nrf_crypto_shared.h"
- #include "oberon_backend_ecc.h"
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
- #include "ocrypto_ecdh_p256.h"
- #endif
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
- #include "ocrypto_curve25519.h"
- #endif
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_ED25519)
- #include "ocrypto_ed25519.h"
- #endif
- /** @internal @brief Structure holding private key common to all curves implemented by the Oberon.
- */
- typedef struct
- {
- nrf_crypto_internal_ecc_key_header_t header; /**< @internal @brief Common ECC key header. */
- uint8_t key[32]; /**< @internal @brief Raw key. */
- } nrf_crypto_backend_oberon_private_key_t;
- /** @internal @brief Structure holding public key common to all curves implemented by the Oberon.
- */
- typedef struct
- {
- nrf_crypto_internal_ecc_key_header_t header; /**< @internal @brief Common ECC key header. */
- uint8_t key[64]; /**< @internal @brief Raw key. */
- } nrf_crypto_backend_oberon_public_key_t;
- /** @internal @brief Function to hold copy function (can be simple mem copy or copy with endian swap).
- */
- typedef void (*copy_fn_t)(void * p_dest, void const * p_src, size_t size);
- ret_code_t nrf_crypto_backend_oberon_private_key_to_raw(
- void const * p_private_key,
- uint8_t * p_raw_data)
- {
- nrf_crypto_backend_oberon_private_key_t const * p_prv =
- (nrf_crypto_backend_oberon_private_key_t const *)p_private_key;
- //lint -save -e611 (Suspicious cast)
- copy_fn_t copy_fn = (copy_fn_t)p_prv->header.p_info->p_backend_data;
- //lint -restore
- copy_fn(p_raw_data, p_prv->key, p_prv->header.p_info->raw_private_key_size);
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_backend_oberon_public_key_from_raw(
- void * p_public_key,
- uint8_t const * p_raw_data)
- {
- nrf_crypto_backend_oberon_public_key_t * p_pub =
- (nrf_crypto_backend_oberon_public_key_t *)p_public_key;
- //lint -save -e611 (Suspicious cast)
- copy_fn_t copy_fn = (copy_fn_t)p_pub->header.p_info->p_backend_data;
- //lint -restore
- copy_fn(p_pub->key, p_raw_data, p_pub->header.p_info->raw_public_key_size);
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_backend_oberon_public_key_to_raw(
- void const * p_public_key,
- uint8_t * p_raw_data)
- {
- nrf_crypto_backend_oberon_public_key_t const * p_pub =
- (nrf_crypto_backend_oberon_public_key_t const *)p_public_key;
- //lint -save -e611 (Suspicious cast)
- copy_fn_t copy_fn = (copy_fn_t)p_pub->header.p_info->p_backend_data;
- //lint -restore
- copy_fn(p_raw_data, p_pub->key, p_pub->header.p_info->raw_public_key_size);
- return NRF_SUCCESS;
- }
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1) \
- || NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
- ret_code_t nrf_crypto_backend_oberon_private_key_from_raw(
- void * p_private_key,
- uint8_t const * p_raw_data)
- {
- nrf_crypto_backend_oberon_private_key_t * p_prv =
- (nrf_crypto_backend_oberon_private_key_t *)p_private_key;
- //lint -save -e611 (Suspicious cast)
- copy_fn_t copy_fn = (copy_fn_t)p_prv->header.p_info->p_backend_data;
- //lint -restore
- copy_fn(p_prv->key, p_raw_data, p_prv->header.p_info->raw_private_key_size);
- return NRF_SUCCESS;
- }
- #endif //NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1) || NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519) \
- || NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_ED25519)
- static ret_code_t oberon_vector_generate(uint8_t * p_data, size_t size)
- {
- #if defined(NRF_CRYPTO_RNG_ENABLED) && (NRF_CRYPTO_RNG_ENABLED == 1)
- return nrf_crypto_rng_vector_generate(p_data, size);
- #elif defined(NRF_CRYPTO_RNG_ENABLED) && (NRF_CRYPTO_RNG_ENABLED == 0)
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- #else
- #warning NRF_CRYPTO_RNG_ENABLED define not found in sdk_config.h (Is the sdk_config.h valid?).
- #endif
- }
- #endif //NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519) || NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_ED25519)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
- // Make sure that common key structure match secp256r1 key structure to safely cast types.
- STATIC_ASSERT(offsetof(nrf_crypto_backend_oberon_private_key_t, key) ==
- offsetof(nrf_crypto_backend_secp256r1_private_key_t, key),
- "Common Oberon private key structure does not match secp256r1 one.");
- STATIC_ASSERT(offsetof(nrf_crypto_backend_oberon_public_key_t, key) ==
- offsetof(nrf_crypto_backend_secp256r1_public_key_t, key),
- "Common Oberon public key structure does not match secp256r1 one.");
- ret_code_t nrf_crypto_backend_oberon_ecc_secp256r1_rng(uint8_t data[32])
- {
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_RNG)
- static const uint8_t min_value[32] =
- {
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
- };
- static const uint8_t max_value[32] =
- {
- 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
- 0xBC, 0xE6, 0xFA, 0xAD, 0xA7, 0x17, 0x9E, 0x84, 0xF3, 0xB9, 0xCA, 0xC2, 0xFC, 0x63, 0x25, 0x50,
- };
- return nrf_crypto_rng_vector_generate_in_range(data, min_value, max_value, 32);
- #else
- return NRF_ERROR_CRYPTO_FEATURE_UNAVAILABLE;
- #endif
- }
- ret_code_t nrf_crypto_backend_secp256r1_key_pair_generate(
- void * p_context,
- void * p_private_key,
- void * p_public_key)
- {
- int result;
- nrf_crypto_backend_secp256r1_private_key_t * p_prv =
- (nrf_crypto_backend_secp256r1_private_key_t *)p_private_key;
- nrf_crypto_backend_secp256r1_public_key_t * p_pub =
- (nrf_crypto_backend_secp256r1_public_key_t *)p_public_key;
- result = nrf_crypto_backend_oberon_ecc_secp256r1_rng(p_prv->key);
- if (result != NRF_SUCCESS)
- {
- return result;
- }
- result = ocrypto_ecdh_p256_public_key(p_pub->key, p_prv->key);
- if (result != 0)
- {
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_backend_secp256r1_public_key_calculate(
- void * p_context,
- void const * p_private_key,
- void * p_public_key)
- {
- int result;
- nrf_crypto_backend_secp256r1_private_key_t const * p_prv =
- (nrf_crypto_backend_secp256r1_private_key_t const *)p_private_key;
- nrf_crypto_backend_secp256r1_public_key_t * p_pub =
- (nrf_crypto_backend_secp256r1_public_key_t *)p_public_key;
- result = ocrypto_ecdh_p256_public_key(p_pub->key, p_prv->key);
- if (result != 0)
- {
- return NRF_ERROR_CRYPTO_INTERNAL;
- }
- return NRF_SUCCESS;
- }
- const nrf_crypto_ecc_curve_info_t g_nrf_crypto_ecc_secp256r1_curve_info =
- {
- .public_key_size = sizeof(nrf_crypto_backend_secp256r1_public_key_t),
- .private_key_size = sizeof(nrf_crypto_backend_secp256r1_private_key_t),
- .curve_type = NRF_CRYPTO_ECC_SECP256R1_CURVE_TYPE,
- .raw_private_key_size = NRF_CRYPTO_ECC_SECP256R1_RAW_PRIVATE_KEY_SIZE,
- .raw_public_key_size = NRF_CRYPTO_ECC_SECP256R1_RAW_PUBLIC_KEY_SIZE,
- //lint -save -e611 -e546 (Suspicious cast, Suspicious use of &)
- .p_backend_data = (void *)&memcpy,
- //lint -restore
- };
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_SECP256R1)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
- // Make sure that common key structure match Curve25519 key structure to safely cast types.
- STATIC_ASSERT(offsetof(nrf_crypto_backend_oberon_private_key_t, key) ==
- offsetof(nrf_crypto_backend_curve25519_private_key_t, key),
- "Common Oberon private key structure does not match Curve25519 one.");
- STATIC_ASSERT(offsetof(nrf_crypto_backend_oberon_public_key_t, key) ==
- offsetof(nrf_crypto_backend_curve25519_public_key_t, key),
- "Common Oberon public key structure does not match Curve25519 one.");
- ret_code_t nrf_crypto_backend_curve25519_key_pair_generate(
- void * p_context,
- void * p_private_key,
- void * p_public_key)
- {
- ret_code_t result;
- nrf_crypto_backend_curve25519_private_key_t * p_prv =
- (nrf_crypto_backend_curve25519_private_key_t *)p_private_key;
- nrf_crypto_backend_curve25519_public_key_t * p_pub =
- (nrf_crypto_backend_curve25519_public_key_t *)p_public_key;
- result = oberon_vector_generate(p_prv->key, sizeof(p_prv->key));
- if (result != NRF_SUCCESS)
- {
- return result;
- }
- p_prv->key[0] &= 0xF8; // Private key is multiply of 8 (by definition), so lower 3 bits are 0.
- p_prv->key[31] &= 0x7F; // Highest bit has to be 0, because private key is 255-bit long.
- p_prv->key[31] |= 0x40; // Bit 254 has to be 1 (by definition)
- ocrypto_curve25519_scalarmult_base(p_pub->key, p_prv->key);
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_backend_curve25519_public_key_calculate(
- void * p_context,
- void const * p_private_key,
- void * p_public_key)
- {
- nrf_crypto_backend_curve25519_private_key_t * p_prv =
- (nrf_crypto_backend_curve25519_private_key_t *)p_private_key;
- nrf_crypto_backend_curve25519_public_key_t * p_pub =
- (nrf_crypto_backend_curve25519_public_key_t *)p_public_key;
- // Private key bit fixing is done inside Oberon library.
- ocrypto_curve25519_scalarmult_base(p_pub->key, p_prv->key);
- return NRF_SUCCESS;
- }
- const nrf_crypto_ecc_curve_info_t g_nrf_crypto_ecc_curve25519_curve_info =
- {
- .public_key_size = sizeof(nrf_crypto_backend_curve25519_public_key_t),
- .private_key_size = sizeof(nrf_crypto_backend_curve25519_private_key_t),
- .curve_type = NRF_CRYPTO_ECC_CURVE25519_CURVE_TYPE,
- .raw_private_key_size = NRF_CRYPTO_ECC_CURVE25519_RAW_PRIVATE_KEY_SIZE,
- .raw_public_key_size = NRF_CRYPTO_ECC_CURVE25519_RAW_PUBLIC_KEY_SIZE,
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_CURVE25519_BIG_ENDIAN)
- //lint -save -e611 -e546 (Suspicious cast, Suspicious use of &)
- .p_backend_data = (void *)&nrf_crypto_internal_swap_endian,
- //lint -restore
- #else
- //lint -save -e611 -e546 (Suspicious cast, Suspicious use of &)
- .p_backend_data = (void *)&memcpy,
- //lint -restore
- #endif
- };
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_CURVE25519)
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_ED25519)
- // Make sure that common key structure match Ed25519 key structure to safely cast types.
- STATIC_ASSERT(offsetof(nrf_crypto_backend_oberon_private_key_t, key) ==
- offsetof(nrf_crypto_backend_ed25519_private_key_t, private_part),
- "Common Oberon private key structure does not match Ed25519 one.");
- STATIC_ASSERT(offsetof(nrf_crypto_backend_oberon_public_key_t, key) ==
- offsetof(nrf_crypto_backend_ed25519_public_key_t, key),
- "Common Oberon public key structure does not match Ed25519 one.");
- ret_code_t nrf_crypto_backend_ed25519_private_key_from_raw(
- void * p_private_key,
- uint8_t const * p_raw_data)
- {
- nrf_crypto_backend_ed25519_private_key_t * p_prv =
- (nrf_crypto_backend_ed25519_private_key_t *)p_private_key;
- memcpy(p_prv->private_part, p_raw_data, sizeof(p_prv->private_part));
- ocrypto_ed25519_public_key(p_prv->public_part, p_prv->private_part);
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_backend_ed25519_key_pair_generate(
- void * p_context,
- void * p_private_key,
- void * p_public_key)
- {
- ret_code_t result;
- nrf_crypto_backend_ed25519_private_key_t * p_prv =
- (nrf_crypto_backend_ed25519_private_key_t *)p_private_key;
- nrf_crypto_backend_ed25519_public_key_t * p_pub =
- (nrf_crypto_backend_ed25519_public_key_t *)p_public_key;
- result = oberon_vector_generate(p_prv->private_part, sizeof(p_prv->private_part));
- if (result != NRF_SUCCESS)
- {
- return result;
- }
- ocrypto_ed25519_public_key(p_prv->public_part, p_prv->private_part);
- memcpy(p_pub->key, p_prv->public_part, sizeof(p_pub->key));
- return NRF_SUCCESS;
- }
- ret_code_t nrf_crypto_backend_ed25519_public_key_calculate(
- void * p_context,
- void const * p_private_key,
- void * p_public_key)
- {
- nrf_crypto_backend_ed25519_private_key_t * p_prv =
- (nrf_crypto_backend_ed25519_private_key_t *)p_private_key;
- nrf_crypto_backend_ed25519_public_key_t * p_pub =
- (nrf_crypto_backend_ed25519_public_key_t *)p_public_key;
- memcpy(p_pub->key, p_prv->public_part, sizeof(p_pub->key));
- return NRF_SUCCESS;
- }
- const nrf_crypto_ecc_curve_info_t g_nrf_crypto_ecc_ed25519_curve_info =
- {
- .public_key_size = sizeof(nrf_crypto_backend_ed25519_public_key_t),
- .private_key_size = sizeof(nrf_crypto_backend_ed25519_private_key_t),
- .curve_type = NRF_CRYPTO_ECC_ED25519_CURVE_TYPE,
- .raw_private_key_size = NRF_CRYPTO_ECC_ED25519_RAW_PRIVATE_KEY_SIZE,
- .raw_public_key_size = NRF_CRYPTO_ECC_ED25519_RAW_PUBLIC_KEY_SIZE,
- //lint -save -e611 -e546 (Suspicious cast, Suspicious use of &)
- .p_backend_data = (void *)&memcpy,
- //lint -restore
- };
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON_ECC_ED25519)
- #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_OBERON)
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