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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| /* | ||
| * | ||
| * Copyright (c) 2023 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. | ||
| */ | ||
|
|
||
| #include <crypto/CHIPCryptoPAL.h> | ||
| #include <lib/core/CHIPSafeCasts.h> | ||
| #include <platform/ESP32/ESP32CHIPCryptoPAL.h> | ||
|
|
||
| #include <ecdsa/ecdsa_alt.h> | ||
| #include <mbedtls/bignum.h> | ||
| #include <mbedtls/ctr_drbg.h> | ||
| #include <mbedtls/ecdh.h> | ||
| #include <mbedtls/ecdsa.h> | ||
| #include <mbedtls/ecp.h> | ||
| #include <mbedtls/error.h> | ||
|
|
||
| // In mbedTLS 3.0.0 direct access to structure fields was replaced with using MBEDTLS_PRIVATE macro. | ||
| #if (MBEDTLS_VERSION_NUMBER >= 0x03000000) | ||
| #define CHIP_CRYPTO_PAL_PRIVATE(x) MBEDTLS_PRIVATE(x) | ||
| #else | ||
| #define CHIP_CRYPTO_PAL_PRIVATE(x) x | ||
| #endif | ||
|
|
||
| #define MAX_ERROR_STR_LEN 128 | ||
|
|
||
| namespace { | ||
|
|
||
| static int CryptoRNG(void * ctxt, uint8_t * out_buffer, size_t out_length) | ||
| { | ||
| return (chip::Crypto::DRBG_get_bytes(out_buffer, out_length) == CHIP_NO_ERROR) ? 0 : 1; | ||
| } | ||
|
|
||
| static inline mbedtls_ecdsa_context * to_ecdsa_ctx(chip::Crypto::P256KeypairContext * context) | ||
| { | ||
| return chip::SafePointerCast<mbedtls_ecdsa_context *>(context); | ||
| } | ||
|
|
||
| static void _log_mbedTLS_error(int error_code) | ||
| { | ||
| if (error_code != 0) | ||
| { | ||
| #if defined(MBEDTLS_ERROR_C) | ||
| char error_str[MAX_ERROR_STR_LEN]; | ||
| mbedtls_strerror(error_code, error_str, sizeof(error_str)); | ||
| ChipLogError(Crypto, "mbedTLS error: %s", error_str); | ||
| #else | ||
| // Error codes defined in 16-bit negative hex numbers. Ease lookup by printing likewise | ||
| ChipLogError(Crypto, "mbedTLS error: -0x%04X", -static_cast<uint16_t>(error_code)); | ||
| #endif | ||
| } | ||
| } | ||
|
|
||
| } // anonymous namespace | ||
|
|
||
| namespace chip { | ||
| namespace Crypto { | ||
|
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| CHIP_ERROR ESP32P256Keypair::Initialize(ECPKeyTarget keyTarget, int efuseBlock) | ||
| { | ||
| Clear(); | ||
|
|
||
| CHIP_ERROR error = CHIP_NO_ERROR; | ||
|
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| mbedtls_ecdsa_context * ecdsa_ctx = to_ecdsa_ctx(&mKeypair); | ||
| mbedtls_ecdsa_init(ecdsa_ctx); | ||
|
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| int status = mbedtls_ecp_group_load(&ecdsa_ctx->MBEDTLS_PRIVATE(grp), MBEDTLS_ECP_DP_SECP256R1); | ||
| VerifyOrExit(status == 0, error = CHIP_ERROR_INTERNAL); | ||
|
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| status = esp_ecdsa_privkey_load_mpi(&ecdsa_ctx->MBEDTLS_PRIVATE(d), efuseBlock); | ||
| VerifyOrExit(status == 0, error = CHIP_ERROR_INTERNAL); | ||
|
|
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| mInitialized = true; | ||
| ecdsa_ctx = nullptr; | ||
| return error; | ||
|
|
||
| exit: | ||
| if (ecdsa_ctx) | ||
| { | ||
| mbedtls_ecdsa_free(ecdsa_ctx); | ||
| ecdsa_ctx = nullptr; | ||
| } | ||
| _log_mbedTLS_error(status); | ||
| return error; | ||
| } | ||
|
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||
| CHIP_ERROR ESP32P256Keypair::ECDSA_sign_msg(const uint8_t * msg, const size_t msg_length, P256ECDSASignature & out_signature) const | ||
| { | ||
| VerifyOrReturnError(mInitialized, CHIP_ERROR_WELL_UNINITIALIZED); | ||
| VerifyOrReturnError((msg != nullptr) && (msg_length > 0), CHIP_ERROR_INVALID_ARGUMENT); | ||
|
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||
| uint8_t digest[kSHA256_Hash_Length]; | ||
| memset(&digest[0], 0, sizeof(digest)); | ||
| ReturnErrorOnFailure(Hash_SHA256(msg, msg_length, &digest[0])); | ||
|
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| #if defined(MBEDTLS_ECDSA_C) | ||
| CHIP_ERROR error = CHIP_NO_ERROR; | ||
| int result = 0; | ||
| mbedtls_mpi r, s; | ||
| mbedtls_mpi_init(&r); | ||
| mbedtls_mpi_init(&s); | ||
|
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||
| mbedtls_ecdsa_context * ecdsa_ctx = to_ecdsa_ctx(&mKeypair); | ||
|
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| result = mbedtls_ecdsa_sign(&ecdsa_ctx->CHIP_CRYPTO_PAL_PRIVATE(grp), &r, &s, &ecdsa_ctx->CHIP_CRYPTO_PAL_PRIVATE(d), | ||
| Uint8::to_const_uchar(digest), sizeof(digest), CryptoRNG, nullptr); | ||
|
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| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); | ||
|
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| VerifyOrExit((mbedtls_mpi_size(&r) <= kP256_FE_Length) && (mbedtls_mpi_size(&s) <= kP256_FE_Length), | ||
| error = CHIP_ERROR_INTERNAL); | ||
|
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| // Concatenate r and s to output. Sizes were checked above. | ||
| result = mbedtls_mpi_write_binary(&r, out_signature.Bytes() + 0u, kP256_FE_Length); | ||
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); | ||
|
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| result = mbedtls_mpi_write_binary(&s, out_signature.Bytes() + kP256_FE_Length, kP256_FE_Length); | ||
| VerifyOrExit(result == 0, error = CHIP_ERROR_INTERNAL); | ||
|
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| VerifyOrExit(out_signature.SetLength(kP256_ECDSA_Signature_Length_Raw) == CHIP_NO_ERROR, error = CHIP_ERROR_INTERNAL); | ||
|
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| exit: | ||
| ecdsa_ctx = nullptr; | ||
| mbedtls_mpi_free(&s); | ||
| mbedtls_mpi_free(&r); | ||
| _log_mbedTLS_error(result); | ||
| return error; | ||
| #else | ||
| return CHIP_ERROR_NOT_IMPLEMENTED; | ||
| #endif | ||
| } | ||
|
|
||
| } // namespace Crypto | ||
| } // namespace chip |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| /* | ||
| * | ||
| * Copyright (c) 2023 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 | ||
| * This files overrides few APIs from mbedTLS based implementation of CHIP crypto primitives | ||
| * for using ECDSA peripheral on ESP32 chips. | ||
| */ | ||
| #pragma once | ||
|
|
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| #include <crypto/CHIPCryptoPAL.h> | ||
|
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| namespace chip { | ||
| namespace Crypto { | ||
|
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| class ESP32P256Keypair : public P256Keypair | ||
| { | ||
| public: | ||
| /** | ||
| * @brief Initialize the keypair with efuse block key | ||
| * @return Returns a CHIP_ERROR on error, CHIP_NO_ERROR otherwise | ||
| **/ | ||
| CHIP_ERROR Initialize(ECPKeyTarget keyTarget, int efuseBlock); | ||
|
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| CHIP_ERROR ECDSA_sign_msg(const uint8_t * msg, const size_t msg_length, P256ECDSASignature & out_signature) const override; | ||
| }; | ||
|
|
||
| } // namespace Crypto | ||
| } // namespace chip |
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