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/*
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*******************************************************************************
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\file belt_bde.c
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\brief STB 34.101.31 (belt): BDE (Blockwise Disk Encryption)
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\project bee2 [cryptographic library]
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\author (C) Sergey Agievich [agievich@{bsu.by|gmail.com}]
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\created 2018.06.28
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\version 2020.03.24
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\license This program is released under the GNU General Public License
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version 3. See Copyright Notices in bee2/info.h.
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*******************************************************************************
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*/
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#include "bee2/core/blob.h"
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#include "bee2/core/err.h"
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#include "bee2/core/mem.h"
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#include "bee2/core/u32.h"
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#include "bee2/core/util.h"
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#include "bee2/crypto/belt.h"
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#include "belt_lcl.h"
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/*
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*******************************************************************************
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Шифрование в режиме BDE
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*******************************************************************************
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*/
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typedef struct
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{
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u32 key[8]; /*< форматированный ключ */
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u32 s[4]; /*< переменная s */
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octet block[16]; /*< вспомогательный блок */
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} belt_bde_st;
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1
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size_t beltBDE_keep()
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{
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return sizeof(belt_bde_st);
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}
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1
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void beltBDEStart(void* state, const octet key[], size_t len,
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const octet iv[16])
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{
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belt_bde_st* st = (belt_bde_st*)state;
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1
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ASSERT(memIsDisjoint2(iv, 16, state, beltBDE_keep()));
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1
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beltKeyExpand2(st->key, key, len);
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u32From(st->s, iv, 16);
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beltBlockEncr2(st->s, st->key);
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}
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void beltBDEStepE(void* buf, size_t count, void* state)
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{
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belt_bde_st* st = (belt_bde_st*)state;
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1
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ASSERT(count % 16 == 0);
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1
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ASSERT(memIsDisjoint2(buf, count, state, beltBDE_keep()));
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// цикл по блокам
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1
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while(count >= 16)
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{
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1
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beltBlockMulC(st->s);
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u32To(st->block, 16, st->s);
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beltBlockXor2(buf, st->block);
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1
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beltBlockEncr(buf, st->key);
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1
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beltBlockXor2(buf, st->block);
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buf = (octet*)buf + 16;
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1
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count -= 16;
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}
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}
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1
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void beltBDEStepD(void* buf, size_t count, void* state)
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{
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belt_bde_st* st = (belt_bde_st*)state;
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1
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ASSERT(count % 16 == 0);
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1
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ASSERT(memIsDisjoint2(buf, count, state, beltBDE_keep()));
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// цикл по блокам
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1
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while(count >= 16)
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{
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1
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beltBlockMulC(st->s);
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1
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u32To(st->block, 16, st->s);
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1
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beltBlockXor2(buf, st->block);
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1
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beltBlockDecr(buf, st->key);
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beltBlockXor2(buf, st->block);
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1
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buf = (octet*)buf + 16;
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1
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count -= 16;
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}
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}
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err_t beltBDEEncr(void* dest, const void* src, size_t count,
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const octet key[], size_t len, const octet iv[16])
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{
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void* state;
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// проверить входные данные
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1
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if (count % 16 != 0 || count < 16 ||
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1
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len != 16 && len != 24 && len != 32 ||
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1
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!memIsValid(src, count) ||
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1
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!memIsValid(key, len) ||
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!memIsValid(iv, 16) ||
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1
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!memIsValid(dest, count))
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0
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return ERR_BAD_INPUT;
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// создать состояние
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1
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state = blobCreate(beltBDE_keep());
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1
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if (state == 0)
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0
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return ERR_OUTOFMEMORY;
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// зашифровать
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1
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beltBDEStart(state, key, len, iv);
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memMove(dest, src, count);
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beltBDEStepE(dest, count, state);
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// завершить
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1
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blobClose(state);
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1
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return ERR_OK;
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}
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1
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err_t beltBDEDecr(void* dest, const void* src, size_t count,
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const octet key[], size_t len, const octet iv[16])
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{
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void* state;
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// проверить входные данные
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1
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if (count % 16 != 0 || count < 16 ||
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1
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len != 16 && len != 24 && len != 32 ||
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1
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!memIsValid(src, count) ||
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1
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!memIsValid(key, len) ||
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1
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!memIsValid(iv, 16) ||
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1
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!memIsValid(dest, count))
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0
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return ERR_BAD_INPUT;
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// создать состояние
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1
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state = blobCreate(beltBDE_keep());
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1
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if (state == 0)
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0
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return ERR_OUTOFMEMORY;
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// расшифровать
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1
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beltBDEStart(state, key, len, iv);
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memMove(dest, src, count);
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1
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beltBDEStepD(dest, count, state);
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// завершить
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1
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blobClose(state);
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1
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return ERR_OK;
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}
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agievich