110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
/*
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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/hmac_key.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include "hmac_operation.h"
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namespace keymaster {
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static HmacSignOperationFactory sign_factory;
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static HmacVerifyOperationFactory verify_factory;
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OperationFactory* HmacKeyFactory::GetOperationFactory(keymaster_purpose_t purpose) const {
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switch (purpose) {
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case KM_PURPOSE_SIGN:
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return &sign_factory;
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case KM_PURPOSE_VERIFY:
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return &verify_factory;
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default:
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return nullptr;
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}
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}
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keymaster_error_t HmacKeyFactory::LoadKey(KeymasterKeyBlob&& key_material,
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const AuthorizationSet& /* additional_params */,
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AuthorizationSet&& hw_enforced,
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AuthorizationSet&& sw_enforced,
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UniquePtr<Key>* key) const {
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if (!key) return KM_ERROR_OUTPUT_PARAMETER_NULL;
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uint32_t min_mac_length;
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if (!hw_enforced.GetTagValue(TAG_MIN_MAC_LENGTH, &min_mac_length) &&
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!sw_enforced.GetTagValue(TAG_MIN_MAC_LENGTH, &min_mac_length)) {
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LOG_E("HMAC key must have KM_TAG_MIN_MAC_LENGTH", 0);
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return KM_ERROR_INVALID_KEY_BLOB;
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}
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key->reset(new (std::nothrow)
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HmacKey(move(key_material), move(hw_enforced), move(sw_enforced), this));
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if (!key->get()) return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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return KM_ERROR_OK;
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}
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keymaster_error_t HmacKeyFactory::validate_algorithm_specific_new_key_params(
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const AuthorizationSet& key_description) const {
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uint32_t min_mac_length_bits;
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if (!key_description.GetTagValue(TAG_MIN_MAC_LENGTH, &min_mac_length_bits))
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return KM_ERROR_MISSING_MIN_MAC_LENGTH;
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keymaster_digest_t digest;
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if (!key_description.GetTagValue(TAG_DIGEST, &digest)) {
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LOG_E("%d digests specified for HMAC key", key_description.GetTagCount(TAG_DIGEST));
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return KM_ERROR_UNSUPPORTED_DIGEST;
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}
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size_t hash_size_bits = 0;
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switch (digest) {
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case KM_DIGEST_NONE:
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return KM_ERROR_UNSUPPORTED_DIGEST;
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case KM_DIGEST_MD5:
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hash_size_bits = 128;
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break;
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case KM_DIGEST_SHA1:
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hash_size_bits = 160;
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break;
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case KM_DIGEST_SHA_2_224:
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hash_size_bits = 224;
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break;
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case KM_DIGEST_SHA_2_256:
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hash_size_bits = 256;
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break;
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case KM_DIGEST_SHA_2_384:
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hash_size_bits = 384;
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break;
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case KM_DIGEST_SHA_2_512:
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hash_size_bits = 512;
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break;
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};
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if (hash_size_bits == 0) {
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// digest was not matched
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return KM_ERROR_UNSUPPORTED_DIGEST;
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}
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if (min_mac_length_bits % 8 != 0 || min_mac_length_bits > hash_size_bits)
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return KM_ERROR_UNSUPPORTED_MIN_MAC_LENGTH;
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if (min_mac_length_bits < kMinHmacLengthBits) return KM_ERROR_UNSUPPORTED_MIN_MAC_LENGTH;
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return KM_ERROR_OK;
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}
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} // namespace keymaster
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