1 /*
2  * Copyright 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef SYSTEM_KEYMASTER_ECDSA_KEYMASTER1_OPERATION_H_
18 #define SYSTEM_KEYMASTER_ECDSA_KEYMASTER1_OPERATION_H_
19 
20 #include <openssl/evp.h>
21 
22 #include <hardware/keymaster1.h>
23 
24 #include <keymaster/android_keymaster_utils.h>
25 #include <keymaster/km_openssl/ecdsa_operation.h>
26 #include <keymaster/legacy_support/keymaster1_engine.h>
27 
28 namespace keymaster {
29 
30 class EcdsaKeymaster1WrappedOperation {
31   public:
EcdsaKeymaster1WrappedOperation(keymaster_purpose_t purpose,const Keymaster1Engine * engine)32     EcdsaKeymaster1WrappedOperation(keymaster_purpose_t purpose, const Keymaster1Engine* engine)
33         : purpose_(purpose), operation_handle_(0), engine_(engine) {}
~EcdsaKeymaster1WrappedOperation()34     ~EcdsaKeymaster1WrappedOperation() {
35         if (operation_handle_) Abort();
36     }
37 
38     keymaster_error_t Begin(EVP_PKEY* ecdsa_key, const AuthorizationSet& input_params);
39     keymaster_error_t PrepareFinish(EVP_PKEY* ecdsa_key, const AuthorizationSet& input_params);
40     keymaster_error_t Abort();
41 
42     keymaster_error_t GetError(EVP_PKEY* ecdsa_key);
43 
GetOperationHandle()44     keymaster_operation_handle_t GetOperationHandle() const { return operation_handle_; }
45 
46   protected:
47     keymaster_purpose_t purpose_;
48     keymaster_operation_handle_t operation_handle_;
49     const Keymaster1Engine* engine_;
50 };
51 
52 template <typename BaseOperation> class EcdsaKeymaster1Operation : public BaseOperation {
53     typedef BaseOperation super;
54 
55   public:
EcdsaKeymaster1Operation(AuthorizationSet && hw_enforced,AuthorizationSet && sw_enforced,keymaster_digest_t digest,EVP_PKEY * key,const Keymaster1Engine * engine)56     EcdsaKeymaster1Operation(AuthorizationSet&& hw_enforced, AuthorizationSet&& sw_enforced,
57                              keymaster_digest_t digest, EVP_PKEY* key,
58                              const Keymaster1Engine* engine)
59         : BaseOperation(move(hw_enforced), move(sw_enforced), digest, key),
60           wrapped_operation_(super::purpose(), engine) {
61         // Shouldn't be instantiated for public key operations.
62         assert(super::purpose() != KM_PURPOSE_VERIFY);
63         assert(super::purpose() != KM_PURPOSE_ENCRYPT);
64     }
65 
Begin(const AuthorizationSet & input_params,AuthorizationSet * output_params)66     keymaster_error_t Begin(const AuthorizationSet& input_params,
67                             AuthorizationSet* output_params) override {
68         keymaster_error_t error = wrapped_operation_.Begin(super::ecdsa_key_, input_params);
69         if (error != KM_ERROR_OK) return error;
70         return super::Begin(input_params, output_params);
71     }
72 
Finish(const AuthorizationSet & input_params,const Buffer & input,const Buffer & signature,AuthorizationSet * output_params,Buffer * output)73     keymaster_error_t Finish(const AuthorizationSet& input_params, const Buffer& input,
74                              const Buffer& signature, AuthorizationSet* output_params,
75                              Buffer* output) override {
76         keymaster_error_t error = wrapped_operation_.PrepareFinish(super::ecdsa_key_, input_params);
77         if (error != KM_ERROR_OK) return error;
78         error = super::Finish(input_params, input, signature, output_params, output);
79         if (wrapped_operation_.GetError(super::ecdsa_key_) != KM_ERROR_OK)
80             error = wrapped_operation_.GetError(super::ecdsa_key_);
81         return error;
82     }
83 
Abort()84     keymaster_error_t Abort() override {
85         keymaster_error_t error = wrapped_operation_.Abort();
86         if (error != KM_ERROR_OK) return error;
87         return super::Abort();
88     }
89 
operation_handle()90     keymaster_operation_handle_t operation_handle() const override {
91         return wrapped_operation_.GetOperationHandle();
92     }
93 
94   private:
95     EcdsaKeymaster1WrappedOperation wrapped_operation_;
96 };
97 
98 /**
99  * Factory that produces EcdsaKeymaster1Operations.  This is instantiated and
100  * provided by EcdsaKeymaster1KeyFactory.
101  */
102 class EcdsaKeymaster1OperationFactory : public OperationFactory {
103   public:
EcdsaKeymaster1OperationFactory(keymaster_purpose_t purpose,const Keymaster1Engine * engine)104     EcdsaKeymaster1OperationFactory(keymaster_purpose_t purpose, const Keymaster1Engine* engine)
105         : purpose_(purpose), engine_(engine) {}
registry_key()106     KeyType registry_key() const override { return KeyType(KM_ALGORITHM_EC, purpose_); }
107 
108     OperationPtr CreateOperation(Key&& key, const AuthorizationSet& begin_params,
109                                  keymaster_error_t* error) override;
110 
111     const keymaster_digest_t* SupportedDigests(size_t* digest_count) const override;
112     const keymaster_padding_t* SupportedPaddingModes(size_t* padding_mode_count) const override;
113 
114   private:
115     keymaster_purpose_t purpose_;
116     const Keymaster1Engine* engine_;
117 };
118 
119 }  // namespace keymaster
120 
121 #endif  // SYSTEM_KEYMASTER_ECDSA_KEYMASTER1_OPERATION_H_
122