/** * 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_common.h" #if NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS) #include "nrf_log.h" #include "nrf_crypto_error.h" #include "nrf_crypto_types.h" #include "mbedtls_backend_hmac.h" #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA256) static ret_code_t mbedtls_backend_hmac_init_sha256(void * const p_context, uint8_t const * p_key, size_t key_size) { int err_code; nrf_crypto_backend_mbedtls_hmac_sha256_context_t * p_ctx = (nrf_crypto_backend_mbedtls_hmac_sha256_context_t *)p_context; // Memset context to 0. This is equevalend with a call to mbedtls_md_init(). memset(p_ctx->md_ctx_buffer, 0, sizeof(p_ctx->md_ctx_buffer)); memset(p_ctx->hmac_ctx_buffer, 0, sizeof(p_ctx->hmac_ctx_buffer)); // Set info and context pointers to buffer allocated by user. // This is Normally handled by mbedtls_md_setup(), but has to be done here in order // to avoid dynamic allocation of memory inside mbed TLS. p_ctx->mbedtls_ctx.md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256); p_ctx->mbedtls_ctx.md_ctx = p_ctx->md_ctx_buffer; p_ctx->mbedtls_ctx.hmac_ctx = p_ctx->hmac_ctx_buffer; // Enter key to start err_code = mbedtls_md_hmac_starts(&p_ctx->mbedtls_ctx, p_key, key_size); if (err_code != 0) { NRF_LOG_ERROR("Error in mbedtls_md_hmac_starts: %u", err_code); return NRF_ERROR_CRYPTO_INTERNAL; } return NRF_SUCCESS; } static ret_code_t mbedtls_backend_hmac_update_sha256(void * const p_context, uint8_t const * p_data, size_t size) { int err_code; nrf_crypto_backend_mbedtls_hmac_sha256_context_t * p_ctx = (nrf_crypto_backend_mbedtls_hmac_sha256_context_t *)p_context; err_code = mbedtls_md_hmac_update(&p_ctx->mbedtls_ctx, p_data, size); if (err_code != 0) { NRF_LOG_ERROR("Error in mbedtls_md_hmac_update: %u", err_code); return NRF_ERROR_CRYPTO_INTERNAL; } return NRF_SUCCESS; } static ret_code_t mbedtls_backend_hmac_finalize_sha256(void * const p_context, uint8_t * p_digest, size_t * const p_size) { int err_code; nrf_crypto_backend_mbedtls_hmac_sha256_context_t * const p_ctx = (nrf_crypto_backend_mbedtls_hmac_sha256_context_t *)p_context; // Set the digest length to 0 so that this is used in case of any error. *p_size = 0; err_code = mbedtls_md_hmac_finish(&p_ctx->mbedtls_ctx, p_digest); if (err_code != 0) { NRF_LOG_ERROR("Error in mbedtls_md_hmac_finish: %u", err_code); return NRF_ERROR_CRYPTO_INTERNAL; } *p_size = p_ctx->header.p_info->digest_size; return NRF_SUCCESS; } // Information structure for HMAC SHA256 using mbed TLS backend. const nrf_crypto_hmac_info_t g_nrf_crypto_hmac_sha256_info = { .init_fn = mbedtls_backend_hmac_init_sha256, .update_fn = mbedtls_backend_hmac_update_sha256, .finalize_fn = mbedtls_backend_hmac_finalize_sha256, .digest_size = NRF_CRYPTO_HASH_SIZE_SHA256, .context_size = sizeof(nrf_crypto_backend_hmac_sha256_context_t), .type = NRF_CRYPTO_HMAC_SHA256_TYPE }; #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA256) #if NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA512) static ret_code_t mbedtls_backend_hmac_init_sha512(void * const p_context, uint8_t const * p_key, size_t key_size) { int err_code; nrf_crypto_backend_mbedtls_hmac_sha512_context_t * p_ctx = (nrf_crypto_backend_mbedtls_hmac_sha512_context_t *)p_context; // Memset context to 0. This is equevalend with a call to mbedtls_md_init(). memset(p_ctx->md_ctx_buffer, 0, sizeof(p_ctx->md_ctx_buffer)); memset(p_ctx->hmac_ctx_buffer, 0, sizeof(p_ctx->hmac_ctx_buffer)); // Set info and context pointers to buffer allocated by user. // (Normally handled by mbedtls_md_setup()) p_ctx->mbedtls_ctx.md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512); p_ctx->mbedtls_ctx.md_ctx = p_ctx->md_ctx_buffer; p_ctx->mbedtls_ctx.hmac_ctx = p_ctx->hmac_ctx_buffer; // Enter key to start err_code = mbedtls_md_hmac_starts(&p_ctx->mbedtls_ctx, p_key, key_size); if (err_code != 0) { NRF_LOG_ERROR("Error in mbedtls_md_hmac_starts: %u", err_code); return NRF_ERROR_CRYPTO_INTERNAL; } return NRF_SUCCESS; } static ret_code_t mbedtls_backend_hmac_update_sha512(void * const p_context, uint8_t const * p_data, size_t size) { int err_code; nrf_crypto_backend_mbedtls_hmac_sha512_context_t * p_ctx = (nrf_crypto_backend_mbedtls_hmac_sha512_context_t *)p_context; err_code = mbedtls_md_hmac_update(&p_ctx->mbedtls_ctx, p_data, size); if (err_code != 0) { NRF_LOG_ERROR("Error in mbedtls_md_hmac_update: %u", err_code); return NRF_ERROR_CRYPTO_INTERNAL; } return NRF_SUCCESS; } static ret_code_t mbedtls_backend_hmac_finalize_sha512(void * const p_context, uint8_t * p_digest, size_t * const p_size) { int err_code; nrf_crypto_backend_mbedtls_hmac_sha512_context_t * p_ctx = (nrf_crypto_backend_mbedtls_hmac_sha512_context_t *)p_context; // Set the digest length to 0 so that this is used in case of any error. *p_size = 0; err_code = mbedtls_md_hmac_finish(&p_ctx->mbedtls_ctx, p_digest); if (err_code != 0) { NRF_LOG_ERROR("Error in mbedtls_md_hmac_finish: %u", err_code); return NRF_ERROR_CRYPTO_INTERNAL; } *p_size = p_ctx->header.p_info->digest_size; return NRF_SUCCESS; } // Information structure for HMAC SHA512 using mbed TLS backend. const nrf_crypto_hmac_info_t g_nrf_crypto_hmac_sha512_info = { .init_fn = mbedtls_backend_hmac_init_sha512, .update_fn = mbedtls_backend_hmac_update_sha512, .finalize_fn = mbedtls_backend_hmac_finalize_sha512, .digest_size = NRF_CRYPTO_HASH_SIZE_SHA512, .context_size = sizeof(nrf_crypto_backend_hmac_sha512_context_t), .type = NRF_CRYPTO_HMAC_SHA512_TYPE }; #endif // NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS_HMAC_SHA512) #endif // NRF_MODULE_ENABLED(NRF_CRYPTO) && NRF_MODULE_ENABLED(NRF_CRYPTO_BACKEND_MBEDTLS)