mirror of
https://github.com/Atmosphere-NX/Atmosphere
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109 lines
4.6 KiB
C++
109 lines
4.6 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours/common.hpp>
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#include <vapours/assert.hpp>
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#include <vapours/util.hpp>
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#include <vapours/crypto/crypto_rsa_calculator.hpp>
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#include <vapours/crypto/impl/crypto_rsa_pss_impl.hpp>
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namespace ams::crypto {
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template<size_t ModulusSize, typename Hash> /* requires HashFunction<Hash> */
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class RsaPssVerifier {
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NON_COPYABLE(RsaPssVerifier);
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NON_MOVEABLE(RsaPssVerifier);
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public:
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static constexpr size_t HashSize = Hash::HashSize;
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static constexpr size_t SaltSize = Hash::HashSize;
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static constexpr size_t SignatureSize = ModulusSize;
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static constexpr size_t MaximumExponentSize = 3;
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static constexpr size_t RequiredWorkBufferSize = RsaCalculator<ModulusSize, MaximumExponentSize>::RequiredWorkBufferSize;
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private:
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enum class State {
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None,
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Initialized,
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Done,
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};
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private:
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RsaCalculator<ModulusSize, MaximumExponentSize> calculator;
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Hash hash;
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State state;
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public:
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RsaPssVerifier() : state(State::None) { /* ... */ }
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~RsaPssVerifier() { }
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bool Initialize(const void *mod, size_t mod_size, const void *exp, size_t exp_size) {
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this->hash.Initialize();
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if (this->calculator.Initialize(mod, mod_size, exp, exp_size)) {
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this->state = State::Initialized;
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return true;
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} else {
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return false;
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}
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}
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void Update(const void *data, size_t size) {
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return this->hash.Update(data, size);
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}
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bool Verify(const void *signature, size_t size) {
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AMS_ASSERT(this->state == State::Initialized);
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AMS_ASSERT(size == SignatureSize);
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ON_SCOPE_EXIT { this->state = State::Done; };
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impl::RsaPssImpl<Hash> impl;
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u8 message[SignatureSize];
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ON_SCOPE_EXIT { ClearMemory(message, sizeof(message)); };
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return this->calculator.ExpMod(message, signature, SignatureSize) &&
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impl.Verify(message, sizeof(message), std::addressof(this->hash));
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}
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bool Verify(const void *signature, size_t size, void *work_buf, size_t work_buf_size) {
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AMS_ASSERT(this->state == State::Initialized);
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AMS_ASSERT(size == SignatureSize);
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ON_SCOPE_EXIT { this->state = State::Done; };
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impl::RsaPssImpl<Hash> impl;
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u8 message[SignatureSize];
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ON_SCOPE_EXIT { ClearMemory(message, sizeof(message)); };
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return this->calculator.ExpMod(message, signature, SignatureSize, work_buf, work_buf_size) &&
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impl.Verify(message, sizeof(message), std::addressof(this->hash));
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}
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static bool Verify(const void *sig, size_t sig_size, const void *mod, size_t mod_size, const void *exp, size_t exp_size, const void *msg, size_t msg_size) {
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RsaPssVerifier<ModulusSize, Hash> verifier;
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if (!verifier.Initialize(mod, mod_size, exp, exp_size)) {
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return false;
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}
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verifier.Update(msg, msg_size);
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return verifier.Verify(sig, sig_size);
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}
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static bool Verify(const void *sig, size_t sig_size, const void *mod, size_t mod_size, const void *exp, size_t exp_size, const void *msg, size_t msg_size, void *work_buf, size_t work_buf_size) {
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RsaPssVerifier<ModulusSize, Hash> verifier;
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if (!verifier.Initialize(mod, mod_size, exp, exp_size)) {
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return false;
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}
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verifier.Update(msg, msg_size);
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return verifier.Verify(sig, sig_size, work_buf, work_buf_size);
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}
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};
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}
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