mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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230 lines
9.8 KiB
C++
230 lines
9.8 KiB
C++
/*
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* Copyright (c) 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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#include <exosphere.hpp>
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#include "se_execute.hpp"
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namespace ams::se {
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namespace {
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struct RsaKeyInfo {
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int modulus_size_val;
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int exponent_size_val;
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};
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constinit RsaKeyInfo g_rsa_key_infos[RsaKeySlotCount] = {};
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void ClearRsaKeySlot(volatile SecurityEngineRegisters *SE, int slot, SE_RSA_KEYTABLE_ADDR_EXPMOD_SEL expmod) {
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constexpr int NumWords = se::RsaSize / sizeof(u32);
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for (int i = 0; i < NumWords; ++i) {
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/* Select the keyslot word. */
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reg::Write(SE->SE_RSA_KEYTABLE_ADDR, SE_REG_BITS_ENUM (RSA_KEYTABLE_ADDR_INPUT_MODE, REGISTER),
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SE_REG_BITS_VALUE(RSA_KEYTABLE_ADDR_KEY_SLOT, slot),
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SE_REG_BITS_VALUE(RSA_KEYTABLE_ADDR_EXPMOD_SEL, expmod),
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SE_REG_BITS_VALUE(RSA_KEYTABLE_ADDR_WORD_ADDR, i));
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/* Clear the keyslot word. */
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SE->SE_RSA_KEYTABLE_DATA = 0;
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}
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}
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void SetRsaKey(volatile SecurityEngineRegisters *SE, int slot, SE_RSA_KEYTABLE_ADDR_EXPMOD_SEL expmod, const void *key, size_t key_size) {
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const int num_words = key_size / sizeof(u32);
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for (int i = 0; i < num_words; ++i) {
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/* Select the keyslot word. */
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reg::Write(SE->SE_RSA_KEYTABLE_ADDR, SE_REG_BITS_ENUM (RSA_KEYTABLE_ADDR_INPUT_MODE, REGISTER),
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SE_REG_BITS_VALUE(RSA_KEYTABLE_ADDR_KEY_SLOT, slot),
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SE_REG_BITS_VALUE(RSA_KEYTABLE_ADDR_EXPMOD_SEL, expmod),
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SE_REG_BITS_VALUE(RSA_KEYTABLE_ADDR_WORD_ADDR, i));
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/* Get the word. */
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const u32 word = util::LoadBigEndian(static_cast<const u32 *>(key) + (num_words - 1 - i));
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/* Write the keyslot word. */
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SE->SE_RSA_KEYTABLE_DATA = word;
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}
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}
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void GetRsaResult(volatile SecurityEngineRegisters *SE, void *dst, size_t size) {
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/* Copy out the words. */
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const int num_words = size / sizeof(u32);
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for (int i = 0; i < num_words; ++i) {
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const u32 word = reg::Read(SE->SE_RSA_OUTPUT[i]);
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util::StoreBigEndian(static_cast<u32 *>(dst) + num_words - 1 - i, word);
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}
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}
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void WaitForInputReadComplete(volatile SecurityEngineRegisters *SE) {
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while (reg::HasValue(SE->SE_INT_STATUS, SE_REG_BITS_ENUM(INT_STATUS_IN_DONE, CLEAR))) { /* ... */ }
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}
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}
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void ClearRsaKeySlot(int slot) {
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/* Validate the key slot. */
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AMS_ABORT_UNLESS(0 <= slot && slot < RsaKeySlotCount);
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/* Clear the info. */
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g_rsa_key_infos[slot] = {};
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/* Get the engine. */
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auto *SE = GetRegisters();
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/* Clear the modulus. */
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ClearRsaKeySlot(SE, slot, SE_RSA_KEYTABLE_ADDR_EXPMOD_SEL_MODULUS);
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/* Clear the exponent. */
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ClearRsaKeySlot(SE, slot, SE_RSA_KEYTABLE_ADDR_EXPMOD_SEL_EXPONENT);
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}
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void LockRsaKeySlot(int slot, u32 flags) {
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/* Validate the key slot. */
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AMS_ABORT_UNLESS(0 <= slot && slot < RsaKeySlotCount);
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/* Get the engine. */
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auto *SE = GetRegisters();
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/* Set non per-key flags. */
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if ((flags & ~KeySlotLockFlags_PerKey) != 0) {
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/* Pack the flags into the expected format. */
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u32 value = 0;
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value |= ((flags & KeySlotLockFlags_KeyRead) == 0) ? (1u << 0) : 0;
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value |= ((flags & KeySlotLockFlags_KeyRead) == 0) ? (1u << 1) : 0;
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value |= ((flags & KeySlotLockFlags_KeyRead) == 0) ? (1u << 2) : 0;
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reg::Write(SE->SE_RSA_KEYTABLE_ACCESS[slot], SE_REG_BITS_ENUM_SEL(RSA_KEYTABLE_ACCESS_KEYREAD, (flags & KeySlotLockFlags_KeyRead) != 0, DISABLE, ENABLE),
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SE_REG_BITS_ENUM_SEL(RSA_KEYTABLE_ACCESS_KEYUPDATE, (flags & KeySlotLockFlags_KeyWrite) != 0, DISABLE, ENABLE),
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SE_REG_BITS_ENUM_SEL(RSA_KEYTABLE_ACCESS_KEYUSE, (flags & KeySlotLockFlags_KeyUse) != 0, DISABLE, ENABLE));
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}
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/* Set per-key flag. */
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if ((flags & KeySlotLockFlags_PerKey) != 0) {
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reg::ReadWrite(SE->SE_RSA_SECURITY_PERKEY, REG_BITS_VALUE(slot, 1, 0));
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}
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}
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void SetRsaKey(int slot, const void *mod, size_t mod_size, const void *exp, size_t exp_size) {
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/* Validate the key slot and sizes. */
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AMS_ABORT_UNLESS(0 <= slot && slot < RsaKeySlotCount);
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AMS_ABORT_UNLESS(mod_size <= RsaSize);
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AMS_ABORT_UNLESS(exp_size <= RsaSize);
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/* Set the sizes in the info. */
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auto &info = g_rsa_key_infos[slot];
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info.modulus_size_val = (mod_size / 64) - 1;
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info.exponent_size_val = (exp_size / 4);
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/* Get the engine. */
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auto *SE = GetRegisters();
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/* Set the modulus and exponent. */
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SetRsaKey(SE, slot, SE_RSA_KEYTABLE_ADDR_EXPMOD_SEL_MODULUS, mod, mod_size);
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SetRsaKey(SE, slot, SE_RSA_KEYTABLE_ADDR_EXPMOD_SEL_EXPONENT, exp, exp_size);
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}
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void ModularExponentiate(void *dst, size_t dst_size, int slot, const void *src, size_t src_size) {
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/* Validate the slot and sizes. */
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AMS_ABORT_UNLESS(0 <= slot && slot < RsaKeySlotCount);
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AMS_ABORT_UNLESS(src_size <= RsaSize);
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AMS_ABORT_UNLESS(dst_size <= RsaSize);
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/* Get the engine. */
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auto *SE = GetRegisters();
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/* Create a work buffer. */
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u8 work[RsaSize];
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util::ClearMemory(work, sizeof(work));
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/* Copy the input into the work buffer (reversing endianness). */
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const u8 *src_u8 = static_cast<const u8 *>(src);
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for (size_t i = 0; i < src_size; ++i) {
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work[src_size - 1 - i] = src_u8[i];
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}
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/* Flush the work buffer to ensure the SE sees correct results. */
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hw::FlushDataCache(work, sizeof(work));
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hw::DataSynchronizationBarrierInnerShareable();
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/* Configure the engine to perform RSA encryption. */
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reg::Write(SE->SE_CONFIG, SE_REG_BITS_ENUM(CONFIG_ENC_MODE, AESMODE_KEY128),
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SE_REG_BITS_ENUM(CONFIG_DEC_MODE, AESMODE_KEY128),
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SE_REG_BITS_ENUM(CONFIG_ENC_ALG, RSA),
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SE_REG_BITS_ENUM(CONFIG_DEC_ALG, NOP),
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SE_REG_BITS_ENUM(CONFIG_DST, RSA_REG));
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/* Configure the engine to use the keyslot and correct modulus/exp sizes. */
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const auto &info = g_rsa_key_infos[slot];
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reg::Write(SE->SE_RSA_CONFIG, SE_REG_BITS_VALUE(RSA_CONFIG_KEY_SLOT, slot));
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reg::Write(SE->SE_RSA_KEY_SIZE, info.modulus_size_val);
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reg::Write(SE->SE_RSA_EXP_SIZE, info.exponent_size_val);
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/* Execute the operation. */
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ExecuteOperation(SE, SE_OPERATION_OP_START, nullptr, 0, work, src_size);
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/* Copy out the result. */
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GetRsaResult(SE, dst, dst_size);
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}
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void ModularExponentiateAsync(int slot, const void *src, size_t src_size, DoneHandler handler) {
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/* Validate the slot and size. */
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AMS_ABORT_UNLESS(0 <= slot && slot < RsaKeySlotCount);
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AMS_ABORT_UNLESS(src_size <= RsaSize);
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/* Get the engine. */
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auto *SE = GetRegisters();
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/* Create a work buffer. */
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u8 work[RsaSize];
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util::ClearMemory(work, sizeof(work));
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/* Copy the input into the work buffer (reversing endianness). */
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const u8 *src_u8 = static_cast<const u8 *>(src);
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for (size_t i = 0; i < src_size; ++i) {
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work[src_size - 1 - i] = src_u8[i];
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}
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/* Flush the work buffer to ensure the SE sees correct results. */
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hw::FlushDataCache(work, sizeof(work));
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hw::DataSynchronizationBarrierInnerShareable();
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/* Configure the engine to perform RSA encryption. */
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reg::Write(SE->SE_CONFIG, SE_REG_BITS_ENUM(CONFIG_ENC_MODE, AESMODE_KEY128),
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SE_REG_BITS_ENUM(CONFIG_DEC_MODE, AESMODE_KEY128),
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SE_REG_BITS_ENUM(CONFIG_ENC_ALG, RSA),
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SE_REG_BITS_ENUM(CONFIG_DEC_ALG, NOP),
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SE_REG_BITS_ENUM(CONFIG_DST, RSA_REG));
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/* Configure the engine to use the keyslot and correct modulus/exp sizes. */
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const auto &info = g_rsa_key_infos[slot];
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reg::Write(SE->SE_RSA_CONFIG, SE_REG_BITS_VALUE(RSA_CONFIG_KEY_SLOT, slot));
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reg::Write(SE->SE_RSA_KEY_SIZE, info.modulus_size_val);
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reg::Write(SE->SE_RSA_EXP_SIZE, info.exponent_size_val);
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/* Set the done handler. */
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SetDoneHandler(SE, handler);
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/* Trigger the input operation. */
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StartInputOperation(SE, work, src_size);
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/* Wait for input to be read by the se. */
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WaitForInputReadComplete(SE);
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}
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void GetRsaResult(void *dst, size_t dst_size) {
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GetRsaResult(GetRegisters(), dst, dst_size);
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}
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}
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