X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=aes_enc.c;fp=aes_enc.c;h=39be410b599dec616215e567c2dd5e7fcee41e48;hb=d6a35f05fd2b5ee79d5ad8424434ad1a068be453;hp=0000000000000000000000000000000000000000;hpb=5ea7340f82f23ba9ccc8fc277623cc3cfff8ad86;p=avr-crypto-lib.git
diff --git a/aes_enc.c b/aes_enc.c
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+/* aes_enc.c */
+/*
+ This file is part of the Crypto-avr-lib/microcrypt-lib.
+ Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that 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 .
+*/
+/**
+ * \file aes_enc.c
+ * \email daniel.otte@rub.de
+ * \author Daniel Otte
+ * \date 2008-12-30
+ * \license GPLv3 or later
+ *
+ */
+
+#include
+#include
+#include "aes.h"
+#include "gf256mul.h"
+#include "aes_sbox.h"
+#include "aes_enc.h"
+#include
+
+
+void aes_shiftrow(void* data, uint8_t shift){
+ uint8_t tmp[4];
+ tmp[0] = ((uint8_t*)data)[(0+shift)&3];
+ tmp[1] = ((uint8_t*)data)[(1+shift)&3];
+ tmp[2] = ((uint8_t*)data)[(2+shift)&3];
+ tmp[3] = ((uint8_t*)data)[(3+shift)&3];
+ memcpy(data, tmp, 4);
+}
+
+#define GF256MUL_1(a) (a)
+#define GF256MUL_2(a) (gf256mul(2, (a), 0x1b))
+#define GF256MUL_3(a) (gf256mul(3, (a), 0x1b))
+
+
+
+static
+void aes_enc_round(aes_cipher_state_t* state, const aes_roundkey_t* k){
+ uint8_t tmp[16];
+ uint8_t i;
+ /* subBytes */
+ for(i=0; i<16; ++i){
+ tmp[i] = pgm_read_byte(aes_sbox+state->s[i]);
+ }
+ /* shiftRows */
+ aes_shiftrow(tmp+4, 1);
+ aes_shiftrow(tmp+8, 2);
+ aes_shiftrow(tmp+12, 3);
+ /* mixColums */
+ for(i=0; i<4; ++i){
+ state->s[4*0+i] =
+ GF256MUL_2(tmp[4*0+i])
+ ^ GF256MUL_3(tmp[4*1+i])
+ ^ GF256MUL_1(tmp[4*2+i])
+ ^ GF256MUL_1(tmp[4*3+i]);
+ state->s[4*1+i] =
+ GF256MUL_1(tmp[4*0+i])
+ ^ GF256MUL_2(tmp[4*1+i])
+ ^ GF256MUL_3(tmp[4*2+i])
+ ^ GF256MUL_1(tmp[4*3+i]);
+ state->s[4*2+i] =
+ GF256MUL_1(tmp[4*0+i])
+ ^ GF256MUL_1(tmp[4*1+i])
+ ^ GF256MUL_2(tmp[4*2+i])
+ ^ GF256MUL_3(tmp[4*3+i]);
+ state->s[4*3+i] =
+ GF256MUL_3(tmp[4*0+i])
+ ^ GF256MUL_1(tmp[4*1+i])
+ ^ GF256MUL_1(tmp[4*2+i])
+ ^ GF256MUL_2(tmp[4*3+i]);
+ }
+
+ /* addKey */
+ for(i=0; i<16; ++i){
+ state->s[i] ^= k->ks[i];
+ }
+}
+
+
+static
+void aes_enc_lastround(aes_cipher_state_t* state,const aes_roundkey_t* k){
+ uint8_t i;
+ /* subBytes */
+ for(i=0; i<16; ++i){
+ state->s[i] = pgm_read_byte(aes_sbox+state->s[i]);
+ }
+ /* shiftRows */
+ aes_shiftrow(state->s+4, 1);
+ aes_shiftrow(state->s+8, 2);
+ aes_shiftrow(state->s+12, 3);
+ /* keyAdd */
+ for(i=0; i<16; ++i){
+ state->s[i] ^= k->ks[i];
+ }
+}
+
+void aes_encrypt_core(aes_cipher_state_t* state, const aes_genctx_t* ks, uint8_t rounds){
+ uint8_t i;
+ for(i=0; i<16; ++i){
+ state->s[i] ^= ks->key[0].ks[i];
+ }
+ i=1;
+ for(;rounds>1;--rounds){
+ aes_enc_round(state, &(ks->key[i]));
+ ++i;
+ }
+ aes_enc_lastround(state, &(ks->key[i]));
+}