2020-05-12 08:32:09 +01:00
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/*
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2021-10-04 20:59:10 +01:00
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* Copyright (c) Atmosphère-NX
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2020-05-12 08:32:09 +01:00
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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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void SetMessageSize(volatile SecurityEngineRegisters *SE, size_t src_size) {
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/* Set the message size. */
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reg::Write(SE->SE_SHA_MSG_LENGTH[0], src_size * BITSIZEOF(u8));
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reg::Write(SE->SE_SHA_MSG_LENGTH[1], 0);
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reg::Write(SE->SE_SHA_MSG_LENGTH[2], 0);
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reg::Write(SE->SE_SHA_MSG_LENGTH[3], 0);
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/* Set the message remaining size. */
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reg::Write(SE->SE_SHA_MSG_LEFT[0], src_size * BITSIZEOF(u8));
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reg::Write(SE->SE_SHA_MSG_LEFT[1], 0);
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reg::Write(SE->SE_SHA_MSG_LEFT[2], 0);
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reg::Write(SE->SE_SHA_MSG_LEFT[3], 0);
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}
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void GetHashResult(volatile SecurityEngineRegisters *SE, void *dst, size_t dst_size) {
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/* Copy out the words. */
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const int num_words = dst_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_HASH_RESULT[i]);
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util::StoreBigEndian(static_cast<u32 *>(dst) + i, word);
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}
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}
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}
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void CalculateSha256(Sha256Hash *dst, const void *src, size_t src_size) {
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/* Get the engine. */
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auto *SE = GetRegisters();
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/* Configure the engine to perform SHA256 "encryption". */
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reg::Write(SE->SE_CONFIG, SE_REG_BITS_ENUM(CONFIG_ENC_MODE, SHA256),
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SE_REG_BITS_ENUM(CONFIG_DEC_MODE, AESMODE_KEY128),
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SE_REG_BITS_ENUM(CONFIG_ENC_ALG, SHA),
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SE_REG_BITS_ENUM(CONFIG_DEC_ALG, NOP),
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SE_REG_BITS_ENUM(CONFIG_DST, HASH_REG));
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/* Begin a hardware hash operation. */
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reg::Write(SE->SE_SHA_CONFIG, SE_REG_BITS_VALUE(SHA_CONFIG_HW_INIT_HASH, 1));
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/* Set the message size. */
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SetMessageSize(SE, src_size);
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/* Execute the operation. */
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ExecuteOperation(SE, SE_OPERATION_OP_START, nullptr, 0, src, src_size);
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/* Get the result. */
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GetHashResult(SE, dst, sizeof(*dst));
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}
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}
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