| /* |
| * Copyright 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef SYSTEM_KEYMASTER_RSA_OPERATION_H_ |
| #define SYSTEM_KEYMASTER_RSA_OPERATION_H_ |
| |
| #include <UniquePtr.h> |
| |
| #include <openssl/evp.h> |
| #include <openssl/rsa.h> |
| |
| #include <keymaster/key_blob.h> |
| |
| #include "operation.h" |
| |
| namespace keymaster { |
| |
| /** |
| * Base class for all RSA operations. |
| * |
| * This class provides RSA key management, plus buffering of data for non-digesting modes. |
| */ |
| class RsaOperation : public Operation { |
| public: |
| RsaOperation(keymaster_purpose_t purpose, keymaster_padding_t padding, RSA* key) |
| : Operation(purpose), rsa_key_(key), padding_(padding) {} |
| ~RsaOperation(); |
| |
| virtual keymaster_error_t Begin(const AuthorizationSet& /* input_params */, |
| AuthorizationSet* /* output_params */) { |
| return KM_ERROR_OK; |
| } |
| virtual keymaster_error_t Update(const AuthorizationSet& additional_params, const Buffer& input, |
| Buffer* output, size_t* input_consumed); |
| virtual keymaster_error_t Abort() { return KM_ERROR_OK; } |
| |
| protected: |
| keymaster_error_t StoreData(const Buffer& input, size_t* input_consumed); |
| |
| RSA* rsa_key_; |
| keymaster_padding_t padding_; |
| Buffer data_; |
| }; |
| |
| /** |
| * Base class for all RSA operations. |
| * |
| * This class adds digesting support, for digesting modes. For non-digesting modes, it falls back |
| * on the RsaOperation input buffering. |
| */ |
| class RsaDigestingOperation : public RsaOperation { |
| public: |
| RsaDigestingOperation(keymaster_purpose_t purpose, keymaster_digest_t digest, |
| keymaster_padding_t padding, RSA* key); |
| ~RsaDigestingOperation(); |
| |
| virtual keymaster_error_t Begin(const AuthorizationSet& input_params, |
| AuthorizationSet* output_params); |
| virtual keymaster_error_t Update(const AuthorizationSet& additional_params, const Buffer& input, |
| Buffer* output, size_t* input_consumed); |
| |
| protected: |
| bool require_digest() const { return padding_ == KM_PAD_RSA_PSS; } |
| keymaster_error_t InitDigest(); |
| keymaster_error_t UpdateDigest(const Buffer& input, size_t* input_consumed); |
| keymaster_error_t FinishDigest(unsigned* digest_size); |
| |
| const keymaster_digest_t digest_; |
| const EVP_MD* digest_algorithm_; |
| EVP_MD_CTX digest_ctx_; |
| uint8_t digest_buf_[EVP_MAX_MD_SIZE]; |
| }; |
| |
| /** |
| * RSA private key signing operation. |
| */ |
| class RsaSignOperation : public RsaDigestingOperation { |
| public: |
| RsaSignOperation(keymaster_digest_t digest, keymaster_padding_t padding, RSA* key) |
| : RsaDigestingOperation(KM_PURPOSE_SIGN, digest, padding, key) {} |
| virtual keymaster_error_t Finish(const AuthorizationSet& additional_params, |
| const Buffer& signature, Buffer* output); |
| |
| private: |
| keymaster_error_t SignUndigested(Buffer* output); |
| keymaster_error_t SignDigested(Buffer* output); |
| keymaster_error_t PrivateEncrypt(uint8_t* to_encrypt, size_t len, int openssl_padding, |
| Buffer* output); |
| keymaster_error_t PssPadDigest(UniquePtr<uint8_t[]>* padded_digest); |
| }; |
| |
| /** |
| * RSA public key verification operation. |
| */ |
| class RsaVerifyOperation : public RsaDigestingOperation { |
| public: |
| RsaVerifyOperation(keymaster_digest_t digest, keymaster_padding_t padding, RSA* key) |
| : RsaDigestingOperation(KM_PURPOSE_VERIFY, digest, padding, key) {} |
| virtual keymaster_error_t Finish(const AuthorizationSet& additional_params, |
| const Buffer& signature, Buffer* output); |
| |
| private: |
| keymaster_error_t VerifyUndigested(const Buffer& signature); |
| keymaster_error_t VerifyDigested(const Buffer& signature); |
| keymaster_error_t DecryptAndMatch(const Buffer& signature, const uint8_t* to_match, size_t len); |
| }; |
| |
| /** |
| * RSA public key encryption operation. |
| */ |
| class RsaEncryptOperation : public RsaOperation { |
| public: |
| RsaEncryptOperation(keymaster_padding_t padding, RSA* key) |
| : RsaOperation(KM_PURPOSE_ENCRYPT, padding, key) {} |
| virtual keymaster_error_t Finish(const AuthorizationSet& additional_params, |
| const Buffer& signature, Buffer* output); |
| }; |
| |
| /** |
| * RSA private key decryption operation. |
| */ |
| class RsaDecryptOperation : public RsaOperation { |
| public: |
| RsaDecryptOperation(keymaster_padding_t padding, RSA* key) |
| : RsaOperation(KM_PURPOSE_DECRYPT, padding, key) {} |
| virtual keymaster_error_t Finish(const AuthorizationSet& additional_params, |
| const Buffer& signature, Buffer* output); |
| }; |
| |
| } // namespace keymaster |
| |
| #endif // SYSTEM_KEYMASTER_RSA_OPERATION_H_ |