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crypto: implement CmacGenerator

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Michael Scire 2024-10-30 18:08:29 -07:00
parent 3a5f70dceb
commit 9f8d17b9e6
4 changed files with 241 additions and 0 deletions
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1
libraries/libvapours/include/vapours/crypto.hpp
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#include <vapours/crypto/crypto_aes_ctr_encryptor_decryptor.hpp>
#include <vapours/crypto/crypto_aes_xts_encryptor_decryptor.hpp>
#include <vapours/crypto/crypto_aes_gcm_encryptor.hpp>
#include <vapours/crypto/crypto_aes_128_cmac_generator.hpp>
#include <vapours/crypto/crypto_rsa_pkcs1_sha256_verifier.hpp>
#include <vapours/crypto/crypto_rsa_pss_sha256_verifier.hpp>
#include <vapours/crypto/crypto_rsa_oaep_sha256_decoder.hpp>

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libraries/libvapours/include/vapours/crypto/crypto_aes_128_cmac_generator.hpp Normal file
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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours/common.hpp>
#include <vapours/assert.hpp>
#include <vapours/util.hpp>
#include <vapours/crypto/crypto_aes_encryptor.hpp>
#include <vapours/crypto/crypto_cmac_generator.hpp>
namespace ams::crypto {
class Aes128CmacGenerator {
NON_COPYABLE(Aes128CmacGenerator);
NON_MOVEABLE(Aes128CmacGenerator);
public:
static constexpr size_t MacSize = AesEncryptor128::BlockSize;
private:
AesEncryptor128 m_aes;
CmacGenerator<AesEncryptor128> m_cmac_generator;
public:
Aes128CmacGenerator() { /* ... */ }
void Initialize(const void *key, size_t key_size) {
AMS_ASSERT(key_size == AesEncryptor128::KeySize);
m_aes.Initialize(key, key_size);
m_cmac_generator.Initialize(std::addressof(m_aes));
}
void Update(const void *data, size_t size) {
m_cmac_generator.Update(data, size);
}
void GetMac(void *dst, size_t size) {
m_cmac_generator.GetMac(dst, size);
}
};
ALWAYS_INLINE void GenerateAes128Cmac(void *dst, size_t dst_size, const void *data, size_t data_size, const void *key, size_t key_size) {
Aes128CmacGenerator cmac_generator;
cmac_generator.Initialize(key, key_size);
cmac_generator.Update(data, data_size);
cmac_generator.GetMac(dst, dst_size);
}
}

51
libraries/libvapours/include/vapours/crypto/crypto_cmac_generator.hpp Normal file
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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours/common.hpp>
#include <vapours/assert.hpp>
#include <vapours/util.hpp>
#include <vapours/crypto/impl/crypto_cmac_impl.hpp>
namespace ams::crypto {
template<typename BlockCipher>
class CmacGenerator {
NON_COPYABLE(CmacGenerator);
NON_MOVEABLE(CmacGenerator);
private:
using Impl = impl::CmacImpl<BlockCipher>;
public:
static constexpr size_t MacSize = BlockCipher::BlockSize;
private:
Impl m_impl;
public:
CmacGenerator() { /* ... */ }
void Initialize(const BlockCipher *cipher) {
return m_impl.Initialize(cipher);
}
void Update(const void *data, size_t size) {
return m_impl.Update(data, size);
}
void GetMac(void *dst, size_t dst_size) {
return m_impl.GetMac(dst, dst_size);
}
};
}

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libraries/libvapours/include/vapours/crypto/impl/crypto_cmac_impl.hpp Normal file
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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours/common.hpp>
#include <vapours/assert.hpp>
#include <vapours/util.hpp>
#include <vapours/crypto/impl/crypto_hash_function.hpp>
#include <vapours/crypto/impl/crypto_cbc_mac_impl.hpp>
#include <vapours/crypto/crypto_memory_clear.hpp>
namespace ams::crypto::impl {
template<typename BlockCipher>
class CmacImpl {
NON_COPYABLE(CmacImpl);
NON_MOVEABLE(CmacImpl);
public:
static constexpr size_t BlockSize = BlockCipher::BlockSize;
static constexpr size_t MacSize = BlockSize;
static_assert(BlockSize == 0x10); /* TODO: Should this be supported? */
private:
enum State {
State_None = 0,
State_Initialized = 1,
State_Done = 2,
};
private:
CbcMacImpl m_cbc_mac_impl;
u8 m_sub_key[BlockSize];
State m_state;
public:
CmacImpl() : m_state(State_None) { /* ... */ }
~CmacImpl() {
/* Clear everything. */
ClearMemory(this, sizeof(*this));
}
void Initialize(const BlockCipher *cipher);
void Update(const void *data, size_t data_size);
void GetMac(void *dst, size_t dst_size);
private:
static void MultiplyOneOverGF128(u8 *data) {
/* Determine the carry bit. */
const u8 carry = data[0] & 0x80;
/* Shift all bytes by one bit. */
for (size_t i = 0; i < BlockSize - 1; ++i) {
data[i] = (data[i] << 1) | (data[i + 1] >> 7);
}
data[BlockSize - 1] <<= 1;
/* Adjust based on carry. */
if (carry) {
data[BlockSize - 1] ^= 0x87;
}
}
};
template<typename BlockCipher>
inline void CmacImpl<BlockCipher>::Initialize(const BlockCipher *cipher) {
/* Clear the key storage. */
std::memset(m_sub_key, 0, sizeof(m_sub_key));
/* Set the key storage. */
cipher->EncryptBlock(m_sub_key, BlockSize, m_sub_key, BlockSize);
MultiplyOneOverGF128(m_sub_key);
/* Initialize the cbc-mac impl. */
m_cbc_mac_impl.Initialize(cipher);
/* Mark initialized. */
m_state = State_Initialized;
}
template<typename BlockCipher>
inline void CmacImpl<BlockCipher>::Update(const void *data, size_t data_size) {
AMS_ASSERT(m_state == State_Initialized);
m_cbc_mac_impl.template Update<BlockCipher>(data, data_size);
}
template<typename BlockCipher>
inline void CmacImpl<BlockCipher>::GetMac(void *dst, size_t dst_size) {
AMS_ASSERT(m_state == State_Initialized || m_state == State_Done);
AMS_ASSERT(dst_size >= MacSize);
AMS_UNUSED(dst_size);
/* If we're not already finalized, get the final mac. */
if (m_state == State_Initialized) {
/* Process padding as needed. */
if (m_cbc_mac_impl.GetBufferedDataSize() != BlockSize) {
/* Determine the remaining size. */
const size_t remaining = BlockSize - m_cbc_mac_impl.GetBufferedDataSize();
/* Update with padding. */
static constexpr u8 s_padding[BlockSize] = { 0x80, /* ... */ };
m_cbc_mac_impl.template Update<BlockCipher>(s_padding, remaining);
/* Update our subkey. */
MultiplyOneOverGF128(m_sub_key);
}
/* Mask the subkey. */
m_cbc_mac_impl.MaskBufferedData(m_sub_key, BlockSize);
/* Set our state as done. */
m_state = State_Done;
}
/* Get the mac. */
m_cbc_mac_impl.GetMac(dst, dst_size);
}
}