1 /*
2  * Copyright 2014 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_OPERATION_H_
18 #define SYSTEM_KEYMASTER_ECDSA_OPERATION_H_
19 
20 #include <openssl/ec.h>
21 #include <openssl/evp.h>
22 
23 #include <UniquePtr.h>
24 
25 #include "operation.h"
26 
27 namespace keymaster {
28 
29 class EcdsaOperation : public Operation {
30   public:
EcdsaOperation(keymaster_purpose_t purpose,keymaster_digest_t digest,EVP_PKEY * key)31     EcdsaOperation(keymaster_purpose_t purpose, keymaster_digest_t digest, EVP_PKEY* key)
32         : Operation(purpose), digest_(digest), ecdsa_key_(key) {
33         EVP_MD_CTX_init(&digest_ctx_);
34     }
35     ~EcdsaOperation();
36 
Abort()37     keymaster_error_t Abort() override { return KM_ERROR_OK; }
38 
39   protected:
40     keymaster_error_t StoreData(const Buffer& input, size_t* input_consumed);
41     keymaster_error_t InitDigest();
42 
43     keymaster_digest_t digest_;
44     const EVP_MD* digest_algorithm_;
45     EVP_PKEY* ecdsa_key_;
46     EVP_MD_CTX digest_ctx_;
47     Buffer data_;
48 };
49 
50 class EcdsaSignOperation : public EcdsaOperation {
51   public:
EcdsaSignOperation(keymaster_purpose_t purpose,keymaster_digest_t digest,EVP_PKEY * key)52     EcdsaSignOperation(keymaster_purpose_t purpose, keymaster_digest_t digest, EVP_PKEY* key)
53         : EcdsaOperation(purpose, digest, key) {}
54     keymaster_error_t Begin(const AuthorizationSet& input_params,
55                             AuthorizationSet* output_params) override;
56     keymaster_error_t Update(const AuthorizationSet& additional_params, const Buffer& input,
57                              AuthorizationSet* output_params, Buffer* output,
58                              size_t* input_consumed) override;
59     keymaster_error_t Finish(const AuthorizationSet& additional_params, const Buffer& signature,
60                              AuthorizationSet* output_params, Buffer* output) override;
61 };
62 
63 class EcdsaVerifyOperation : public EcdsaOperation {
64   public:
EcdsaVerifyOperation(keymaster_purpose_t purpose,keymaster_digest_t digest,EVP_PKEY * key)65     EcdsaVerifyOperation(keymaster_purpose_t purpose, keymaster_digest_t digest, EVP_PKEY* key)
66         : EcdsaOperation(purpose, digest, key) {}
67     keymaster_error_t Begin(const AuthorizationSet& input_params,
68                             AuthorizationSet* output_params) override;
69     keymaster_error_t Update(const AuthorizationSet& additional_params, const Buffer& input,
70                              AuthorizationSet* output_params, Buffer* output,
71                              size_t* input_consumed) override;
72     keymaster_error_t Finish(const AuthorizationSet& additional_params, const Buffer& signature,
73                              AuthorizationSet* output_params, Buffer* output) override;
74 };
75 
76 class EcdsaOperationFactory : public OperationFactory {
77   private:
registry_key()78     KeyType registry_key() const override { return KeyType(KM_ALGORITHM_EC, purpose()); }
79     Operation* CreateOperation(const Key& key, const AuthorizationSet& begin_params,
80                                keymaster_error_t* error) override;
81     const keymaster_digest_t* SupportedDigests(size_t* digest_count) const override;
82 
83     virtual keymaster_purpose_t purpose() const = 0;
84     virtual Operation* InstantiateOperation(keymaster_digest_t digest, EVP_PKEY* key) = 0;
85 };
86 
87 class EcdsaSignOperationFactory : public EcdsaOperationFactory {
88   private:
purpose()89     keymaster_purpose_t purpose() const override { return KM_PURPOSE_SIGN; }
InstantiateOperation(keymaster_digest_t digest,EVP_PKEY * key)90     Operation* InstantiateOperation(keymaster_digest_t digest, EVP_PKEY* key) {
91         return new (std::nothrow) EcdsaSignOperation(purpose(), digest, key);
92     }
93 };
94 
95 class EcdsaVerifyOperationFactory : public EcdsaOperationFactory {
96   public:
purpose()97     keymaster_purpose_t purpose() const override { return KM_PURPOSE_VERIFY; }
InstantiateOperation(keymaster_digest_t digest,EVP_PKEY * key)98     Operation* InstantiateOperation(keymaster_digest_t digest, EVP_PKEY* key) {
99         return new (std::nothrow) EcdsaVerifyOperation(KM_PURPOSE_VERIFY, digest, key);
100     }
101 };
102 
103 }  // namespace keymaster
104 
105 #endif  // SYSTEM_KEYMASTER_ECDSA_OPERATION_H_
106