| /* |
| * |
| * Copyright (c) 2021 Project CHIP Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * HSM based implementation of CHIP crypto primitives |
| * Based on configurations in CHIPCryptoPALHsm_config.h file, |
| * chip crypto apis use either HSM or rollback to software implementation. |
| */ |
| |
| #include "CHIPCryptoPALHsm_SE05X_utils.h" |
| #include <lib/core/CHIPEncoding.h> |
| |
| #if ENABLE_HSM_HKDF_SHA256 |
| |
| namespace chip { |
| namespace Crypto { |
| |
| HKDF_shaHSM::HKDF_shaHSM() |
| { |
| keyid = kKeyId_hkdf_sha256_hmac_keyid; |
| } |
| HKDF_shaHSM::~HKDF_shaHSM() {} |
| |
| CHIP_ERROR HKDF_shaHSM::HKDF_SHA256(const uint8_t * secret, const size_t secret_length, const uint8_t * salt, |
| const size_t salt_length, const uint8_t * info, const size_t info_length, uint8_t * out_buffer, |
| size_t out_length) |
| { |
| CHIP_ERROR error = CHIP_ERROR_INTERNAL; |
| if (salt_length > 64 || info_length > 80 || secret_length > 256 || out_length > 768) |
| { |
| /* Length not supported by se05x. Rollback to SW */ |
| return HKDF_sha::HKDF_SHA256(secret, secret_length, salt, salt_length, info, info_length, out_buffer, out_length); |
| } |
| |
| // Salt is optional |
| if (salt_length > 0) |
| { |
| VerifyOrReturnError(salt != nullptr, CHIP_ERROR_INVALID_ARGUMENT); |
| } |
| VerifyOrReturnError(info_length > 0, CHIP_ERROR_INVALID_ARGUMENT); |
| VerifyOrReturnError(info != nullptr, CHIP_ERROR_INVALID_ARGUMENT); |
| VerifyOrReturnError(out_length > 0, CHIP_ERROR_INVALID_ARGUMENT); |
| VerifyOrReturnError(out_buffer != nullptr, CHIP_ERROR_INVALID_ARGUMENT); |
| VerifyOrReturnError(secret != nullptr, CHIP_ERROR_INVALID_ARGUMENT); |
| |
| VerifyOrReturnError(keyid != kKeyId_NotInitialized, CHIP_ERROR_HSM); |
| |
| se05x_sessionOpen(); |
| VerifyOrReturnError(gex_sss_chip_ctx.ks.session != NULL, CHIP_ERROR_INTERNAL); |
| |
| sss_object_t keyObject = { 0 }; |
| sss_status_t status = sss_key_object_init(&keyObject, &gex_sss_chip_ctx.ks); |
| VerifyOrReturnError(status == kStatus_SSS_Success, CHIP_ERROR_INTERNAL); |
| |
| status = sss_key_object_allocate_handle(&keyObject, keyid, kSSS_KeyPart_Default, kSSS_CipherType_HMAC, secret_length, |
| kKeyObject_Mode_Transient); |
| VerifyOrReturnError(status == kStatus_SSS_Success, CHIP_ERROR_INTERNAL); |
| |
| status = sss_key_store_set_key(&gex_sss_chip_ctx.ks, &keyObject, secret, secret_length, secret_length * 8, NULL, 0); |
| VerifyOrReturnError(status == kStatus_SSS_Success, CHIP_ERROR_INTERNAL); |
| |
| const smStatus_t smstatus = Se05x_API_HKDF_Extended( |
| &((sss_se05x_session_t *) &gex_sss_chip_ctx.session)->s_ctx, keyObject.keyId, kSE05x_DigestMode_SHA256, |
| kSE05x_HkdfMode_ExtractExpand, salt, salt_length, 0, info, info_length, 0, (uint16_t) out_length, out_buffer, &out_length); |
| VerifyOrExit(smstatus == SM_OK, error = CHIP_ERROR_INTERNAL); |
| |
| error = CHIP_NO_ERROR; |
| exit: |
| sss_key_store_erase_key(&gex_sss_chip_ctx.ks, &keyObject); |
| |
| return error; |
| } |
| |
| } // namespace Crypto |
| } // namespace chip |
| |
| #endif //#if ENABLE_HSM_HKDF_SHA256 |