288 lines
12 KiB
C++
288 lines
12 KiB
C++
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/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <keymaster/km_openssl/ecdsa_operation.h>
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#include <openssl/curve25519.h>
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#include <openssl/ecdsa.h>
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#include <keymaster/km_openssl/ec_key.h>
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#include <keymaster/km_openssl/openssl_err.h>
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#include <keymaster/km_openssl/openssl_utils.h>
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namespace keymaster {
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// Message size limit for Ed25519 messages, which are not pre-digested.
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static const size_t MAX_ED25519_MSG_SIZE = 16 * 1024;
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static const keymaster_digest_t supported_digests[] = {KM_DIGEST_NONE, KM_DIGEST_SHA1,
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KM_DIGEST_SHA_2_224, KM_DIGEST_SHA_2_256,
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KM_DIGEST_SHA_2_384, KM_DIGEST_SHA_2_512};
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OperationPtr EcdsaOperationFactory::CreateOperation(Key&& key, const AuthorizationSet& begin_params,
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keymaster_error_t* error) {
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const AsymmetricKey& ecdsa_key = static_cast<AsymmetricKey&>(key);
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EVP_PKEY_Ptr pkey(ecdsa_key.InternalToEvp());
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if (pkey.get() == nullptr) {
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*error = KM_ERROR_UNKNOWN_ERROR;
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return nullptr;
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}
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keymaster_digest_t digest;
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if (!GetAndValidateDigest(begin_params, ecdsa_key, &digest, error, true)) {
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return nullptr;
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}
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*error = KM_ERROR_OK;
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auto op = OperationPtr(InstantiateOperation(key.hw_enforced_move(), key.sw_enforced_move(),
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digest, pkey.release()));
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if (!op) *error = KM_ERROR_MEMORY_ALLOCATION_FAILED;
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return op;
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}
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const keymaster_digest_t* EcdsaOperationFactory::SupportedDigests(size_t* digest_count) const {
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*digest_count = array_length(supported_digests);
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return supported_digests;
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}
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EcdsaOperation::~EcdsaOperation() {
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if (ecdsa_key_ != nullptr) EVP_PKEY_free(ecdsa_key_);
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EVP_MD_CTX_cleanup(&digest_ctx_);
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}
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keymaster_error_t EcdsaOperation::InitDigest() {
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switch (digest_) {
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case KM_DIGEST_NONE:
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return KM_ERROR_OK;
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case KM_DIGEST_MD5:
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return KM_ERROR_UNSUPPORTED_DIGEST;
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case KM_DIGEST_SHA1:
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digest_algorithm_ = EVP_sha1();
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return KM_ERROR_OK;
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case KM_DIGEST_SHA_2_224:
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digest_algorithm_ = EVP_sha224();
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return KM_ERROR_OK;
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case KM_DIGEST_SHA_2_256:
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digest_algorithm_ = EVP_sha256();
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return KM_ERROR_OK;
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case KM_DIGEST_SHA_2_384:
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digest_algorithm_ = EVP_sha384();
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return KM_ERROR_OK;
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case KM_DIGEST_SHA_2_512:
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digest_algorithm_ = EVP_sha512();
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return KM_ERROR_OK;
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default:
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return KM_ERROR_UNSUPPORTED_DIGEST;
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}
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}
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inline size_t min(size_t a, size_t b) {
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return (a < b) ? a : b;
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}
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keymaster_error_t EcdsaOperation::StoreData(const Buffer& input, size_t* input_consumed) {
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if (!data_.reserve((EVP_PKEY_bits(ecdsa_key_) + 7) / 8))
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return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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if (!data_.write(input.peek_read(), min(data_.available_write(), input.available_read())))
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return KM_ERROR_UNKNOWN_ERROR;
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*input_consumed = input.available_read();
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return KM_ERROR_OK;
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}
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keymaster_error_t EcdsaSignOperation::Begin(const AuthorizationSet& /* input_params */,
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AuthorizationSet* /* output_params */) {
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auto rc = GenerateRandom(reinterpret_cast<uint8_t*>(&operation_handle_),
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(size_t)sizeof(operation_handle_));
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if (rc != KM_ERROR_OK) return rc;
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keymaster_error_t error = InitDigest();
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if (error != KM_ERROR_OK) return error;
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if (digest_ == KM_DIGEST_NONE) return KM_ERROR_OK;
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EVP_PKEY_CTX* pkey_ctx;
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if (EVP_DigestSignInit(&digest_ctx_, &pkey_ctx, digest_algorithm_, nullptr /* engine */,
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ecdsa_key_) != 1)
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return TranslateLastOpenSslError();
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return KM_ERROR_OK;
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}
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keymaster_error_t EcdsaSignOperation::Update(const AuthorizationSet& /* additional_params */,
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const Buffer& input,
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AuthorizationSet* /* output_params */,
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Buffer* /* output */, size_t* input_consumed) {
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if (digest_ == KM_DIGEST_NONE) return StoreData(input, input_consumed);
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if (EVP_DigestSignUpdate(&digest_ctx_, input.peek_read(), input.available_read()) != 1)
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return TranslateLastOpenSslError();
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*input_consumed = input.available_read();
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return KM_ERROR_OK;
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}
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keymaster_error_t EcdsaSignOperation::Finish(const AuthorizationSet& additional_params,
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const Buffer& input, const Buffer& /* signature */,
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AuthorizationSet* /* output_params */,
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Buffer* output) {
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if (!output) return KM_ERROR_OUTPUT_PARAMETER_NULL;
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keymaster_error_t error = UpdateForFinish(additional_params, input);
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if (error != KM_ERROR_OK) return error;
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size_t siglen;
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if (digest_ == KM_DIGEST_NONE) {
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UniquePtr<EC_KEY, EC_KEY_Delete> ecdsa(EVP_PKEY_get1_EC_KEY(ecdsa_key_));
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if (!ecdsa.get()) return TranslateLastOpenSslError();
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output->Reinitialize(ECDSA_size(ecdsa.get()));
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unsigned int siglen_tmp;
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if (!ECDSA_sign(0 /* type -- ignored */, data_.peek_read(), data_.available_read(),
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output->peek_write(), &siglen_tmp, ecdsa.get()))
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return TranslateLastOpenSslError();
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siglen = siglen_tmp;
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} else {
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if (EVP_DigestSignFinal(&digest_ctx_, nullptr /* signature */, &siglen) != 1)
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return TranslateLastOpenSslError();
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if (!output->Reinitialize(siglen)) return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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if (EVP_DigestSignFinal(&digest_ctx_, output->peek_write(), &siglen) <= 0)
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return TranslateLastOpenSslError();
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}
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if (!output->advance_write(siglen)) return KM_ERROR_UNKNOWN_ERROR;
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return KM_ERROR_OK;
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}
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keymaster_error_t Ed25519SignOperation::Begin(const AuthorizationSet& /* input_params */,
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AuthorizationSet* /* output_params */) {
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if (digest_ != KM_DIGEST_NONE) {
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// Ed25519 includes an internal digest, so no pre-digesting is supported.
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return KM_ERROR_UNSUPPORTED_DIGEST;
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}
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return GenerateRandom(reinterpret_cast<uint8_t*>(&operation_handle_),
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(size_t)sizeof(operation_handle_));
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}
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keymaster_error_t Ed25519SignOperation::Update(const AuthorizationSet& /* additional_params */,
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const Buffer& input,
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AuthorizationSet* /* output_params */,
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Buffer* /* output */, size_t* input_consumed) {
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return StoreAllData(input, input_consumed);
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}
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keymaster_error_t Ed25519SignOperation::Finish(const AuthorizationSet& additional_params,
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const Buffer& input, const Buffer& /* signature */,
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AuthorizationSet* /* output_params */,
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Buffer* output) {
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if (!output) return KM_ERROR_OUTPUT_PARAMETER_NULL;
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keymaster_error_t error = UpdateForFinish(additional_params, input);
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if (error != KM_ERROR_OK) return error;
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if (!output->Reinitialize(ED25519_SIGNATURE_LEN)) {
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return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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}
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EVP_MD_CTX ctx;
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EVP_MD_CTX_init(&ctx);
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if (!EVP_DigestSignInit(&ctx, /* pctx */ nullptr, /* digest */ nullptr, /* engine */ nullptr,
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ecdsa_key_)) {
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EVP_MD_CTX_cleanup(&ctx);
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return TranslateLastOpenSslError();
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}
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size_t out_len = ED25519_SIGNATURE_LEN;
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if (!EVP_DigestSign(&ctx, output->peek_write(), &out_len, data_.peek_read(),
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data_.available_read())) {
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EVP_MD_CTX_cleanup(&ctx);
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return TranslateLastOpenSslError();
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}
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EVP_MD_CTX_cleanup(&ctx);
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output->advance_write(out_len);
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return KM_ERROR_OK;
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}
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keymaster_error_t Ed25519SignOperation::StoreAllData(const Buffer& input, size_t* input_consumed) {
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if ((data_.available_read() + input.available_read()) > MAX_ED25519_MSG_SIZE) {
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return KM_ERROR_INVALID_INPUT_LENGTH;
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}
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if (!data_.reserve(input.available_read())) {
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return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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}
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if (!data_.write(input.peek_read(), input.available_read())) {
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return KM_ERROR_UNKNOWN_ERROR;
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}
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*input_consumed = input.available_read();
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return KM_ERROR_OK;
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}
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keymaster_error_t EcdsaVerifyOperation::Begin(const AuthorizationSet& /* input_params */,
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AuthorizationSet* /* output_params */) {
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auto rc = GenerateRandom(reinterpret_cast<uint8_t*>(&operation_handle_),
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(size_t)sizeof(operation_handle_));
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if (rc != KM_ERROR_OK) return rc;
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keymaster_error_t error = InitDigest();
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if (error != KM_ERROR_OK) return error;
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if (digest_ == KM_DIGEST_NONE) return KM_ERROR_OK;
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EVP_PKEY_CTX* pkey_ctx;
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if (EVP_DigestVerifyInit(&digest_ctx_, &pkey_ctx, digest_algorithm_, nullptr /* engine */,
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ecdsa_key_) != 1)
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return TranslateLastOpenSslError();
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return KM_ERROR_OK;
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}
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keymaster_error_t EcdsaVerifyOperation::Update(const AuthorizationSet& /* additional_params */,
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const Buffer& input,
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AuthorizationSet* /* output_params */,
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Buffer* /* output */, size_t* input_consumed) {
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if (digest_ == KM_DIGEST_NONE) return StoreData(input, input_consumed);
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if (EVP_DigestVerifyUpdate(&digest_ctx_, input.peek_read(), input.available_read()) != 1)
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return TranslateLastOpenSslError();
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*input_consumed = input.available_read();
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return KM_ERROR_OK;
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}
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keymaster_error_t EcdsaVerifyOperation::Finish(const AuthorizationSet& additional_params,
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const Buffer& input, const Buffer& signature,
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AuthorizationSet* /* output_params */,
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Buffer* /* output */) {
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keymaster_error_t error = UpdateForFinish(additional_params, input);
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if (error != KM_ERROR_OK) return error;
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if (digest_ == KM_DIGEST_NONE) {
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UniquePtr<EC_KEY, EC_KEY_Delete> ecdsa(EVP_PKEY_get1_EC_KEY(ecdsa_key_));
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if (!ecdsa.get()) return TranslateLastOpenSslError();
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int result =
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ECDSA_verify(0 /* type -- ignored */, data_.peek_read(), data_.available_read(),
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signature.peek_read(), signature.available_read(), ecdsa.get());
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if (result < 0)
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return TranslateLastOpenSslError();
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else if (result == 0)
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return KM_ERROR_VERIFICATION_FAILED;
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} else if (!EVP_DigestVerifyFinal(&digest_ctx_, signature.peek_read(),
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signature.available_read()))
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return KM_ERROR_VERIFICATION_FAILED;
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return KM_ERROR_OK;
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}
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} // namespace keymaster
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