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
27namespace keymaster {
28
29class EcdsaOperation : public Operation {
30  public:
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
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
50class EcdsaSignOperation : public EcdsaOperation {
51  public:
52    EcdsaSignOperation(keymaster_digest_t digest, EVP_PKEY* key)
53        : EcdsaOperation(KM_PURPOSE_SIGN, 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& input,
60                             const Buffer& signature, AuthorizationSet* output_params,
61                             Buffer* output) override;
62};
63
64class EcdsaVerifyOperation : public EcdsaOperation {
65  public:
66    EcdsaVerifyOperation(keymaster_digest_t digest, EVP_PKEY* key)
67        : EcdsaOperation(KM_PURPOSE_VERIFY, digest, key) {}
68    keymaster_error_t Begin(const AuthorizationSet& input_params,
69                            AuthorizationSet* output_params) override;
70    keymaster_error_t Update(const AuthorizationSet& additional_params, const Buffer& input,
71                             AuthorizationSet* output_params, Buffer* output,
72                             size_t* input_consumed) override;
73    keymaster_error_t Finish(const AuthorizationSet& additional_params, const Buffer& input,
74                             const Buffer& signature, AuthorizationSet* output_params,
75                             Buffer* output) override;
76};
77
78class EcdsaOperationFactory : public OperationFactory {
79  private:
80    KeyType registry_key() const override { return KeyType(KM_ALGORITHM_EC, purpose()); }
81    Operation* CreateOperation(const Key& key, const AuthorizationSet& begin_params,
82                               keymaster_error_t* error) override;
83    const keymaster_digest_t* SupportedDigests(size_t* digest_count) const override;
84
85    virtual keymaster_purpose_t purpose() const = 0;
86    virtual Operation* InstantiateOperation(keymaster_digest_t digest, EVP_PKEY* key) = 0;
87};
88
89class EcdsaSignOperationFactory : public EcdsaOperationFactory {
90  private:
91    keymaster_purpose_t purpose() const override { return KM_PURPOSE_SIGN; }
92    Operation* InstantiateOperation(keymaster_digest_t digest, EVP_PKEY* key) {
93        return new (std::nothrow) EcdsaSignOperation(digest, key);
94    }
95};
96
97class EcdsaVerifyOperationFactory : public EcdsaOperationFactory {
98  public:
99    keymaster_purpose_t purpose() const override { return KM_PURPOSE_VERIFY; }
100    Operation* InstantiateOperation(keymaster_digest_t digest, EVP_PKEY* key) {
101        return new (std::nothrow) EcdsaVerifyOperation(digest, key);
102    }
103};
104
105}  // namespace keymaster
106
107#endif  // SYSTEM_KEYMASTER_ECDSA_OPERATION_H_
108