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349 lines
13 KiB
C
349 lines
13 KiB
C
/*
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* Copyright (c) 2024, ArtInChip Technology Co., Ltd
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <stdio.h>
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#include "soft-aes-ecb.h"
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// The number of columns comprising a state in AES. This is a constant in AES. Value=4
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#define Nb 4
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#define Nk 4 // The number of 32 bit words in a key.
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#define Nr 10 // The number of rounds in AES cipher.
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// state - array holding the intermediate results during decryption.
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typedef unsigned char state_t[4][4];
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// The lookup-tables are marked const so they can be placed in read-only storage instead of RAM
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// The numbers below can be computed dynamically trading ROM for RAM -
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// This can be useful in (embedded) bootloader applications, where ROM is often limited.
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static const unsigned char sbox[256] = {
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//0 1 2 3 4 5 6 7 8 9 A B C D E F
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 };
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static const unsigned char rsbox[256] = {
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0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
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0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
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0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
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0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
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0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
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0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
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0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
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0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
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0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
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0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
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0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
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0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d };
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// The round constant word array, Rcon[i], contains the values given by
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// x to the power (i-1) being powers of x (x is denoted as {02}) in the field GF(2^8)
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static const unsigned char Rcon[11] = {
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0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
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/*
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* Jordan Goulder points out in PR #12 (https://github.com/kokke/tiny-AES-C/pull/12),
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* that you can remove most of the elements in the Rcon array, because they are unused.
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*
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* From Wikipedia's article on the Rijndael key schedule @ https://en.wikipedia.org/wiki/Rijndael_key_schedule#Rcon
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*
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* "Only the first some of these constants are actually used – up to rcon[10] for AES-128 (as 11 round keys are needed),
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* up to rcon[8] for AES-192, up to rcon[7] for AES-256. rcon[0] is not used in AES algorithm."
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*/
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#define get_sbox_value(num) (sbox[(num)])
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// This function produces Nb(Nr+1) round keys. The round keys are used in each round to decrypt the states.
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static void key_expansion(unsigned char *round_key, const unsigned char *Key)
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{
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unsigned i, j, k;
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unsigned char tempa[4]; // Used for the column/row operations
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// The first round key is the key itself.
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for (i = 0; i < Nk; ++i) {
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round_key[(i * 4) + 0] = Key[(i * 4) + 0];
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round_key[(i * 4) + 1] = Key[(i * 4) + 1];
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round_key[(i * 4) + 2] = Key[(i * 4) + 2];
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round_key[(i * 4) + 3] = Key[(i * 4) + 3];
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}
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// All other round keys are found from the previous round keys.
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for (i = Nk; i < Nb * (Nr + 1); ++i) {
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k = (i - 1) * 4;
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tempa[0] = round_key[k + 0];
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tempa[1] = round_key[k + 1];
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tempa[2] = round_key[k + 2];
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tempa[3] = round_key[k + 3];
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if (i % Nk == 0) {
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// This function shifts the 4 bytes in a word to the left once.
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// [a0,a1,a2,a3] becomes [a1,a2,a3,a0]
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// Function RotWord()
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const unsigned char u8tmp = tempa[0];
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tempa[0] = tempa[1];
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tempa[1] = tempa[2];
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tempa[2] = tempa[3];
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tempa[3] = u8tmp;
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// SubWord() is a function that takes a four-byte input word and
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// applies the S-box to each of the four bytes to produce an output word.
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// Function Subword()
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tempa[0] = get_sbox_value(tempa[0]);
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tempa[1] = get_sbox_value(tempa[1]);
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tempa[2] = get_sbox_value(tempa[2]);
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tempa[3] = get_sbox_value(tempa[3]);
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tempa[0] = tempa[0] ^ Rcon[i / Nk];
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}
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j = i * 4;
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k = (i - Nk) * 4;
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round_key[j + 0] = round_key[k + 0] ^ tempa[0];
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round_key[j + 1] = round_key[k + 1] ^ tempa[1];
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round_key[j + 2] = round_key[k + 2] ^ tempa[2];
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round_key[j + 3] = round_key[k + 3] ^ tempa[3];
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}
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}
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void aes_init_ctx(struct aes_ctx *ctx, const unsigned char *key)
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{
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key_expansion(ctx->round_key, key);
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}
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// This function adds the round key to state.
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// The round key is added to the state by an XOR function.
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static void add_round_key(unsigned char round, state_t *state, const unsigned char *round_key)
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{
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unsigned char i, j;
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for (i = 0; i < 4; ++i) {
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for (j = 0; j < 4; ++j) {
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(*state)[i][j] ^= round_key[(round * Nb * 4) + (i * Nb) + j];
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}
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}
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}
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// The sub_bytes Function Substitutes the values in the
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// state matrix with values in an S-box.
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static void sub_bytes(state_t *state)
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{
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unsigned char i, j;
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for (i = 0; i < 4; ++i) {
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for (j = 0; j < 4; ++j) {
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(*state)[j][i] = get_sbox_value((*state)[j][i]);
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}
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}
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}
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// The shift_rows() function shifts the rows in the state to the left.
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// Each row is shifted with different offset.
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// Offset = Row number. So the first row is not shifted.
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static void shift_rows(state_t *state)
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{
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unsigned char temp;
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// Rotate first row 1 columns to left
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temp = (*state)[0][1];
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(*state)[0][1] = (*state)[1][1];
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(*state)[1][1] = (*state)[2][1];
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(*state)[2][1] = (*state)[3][1];
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(*state)[3][1] = temp;
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// Rotate second row 2 columns to left
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temp = (*state)[0][2];
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(*state)[0][2] = (*state)[2][2];
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(*state)[2][2] = temp;
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temp = (*state)[1][2];
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(*state)[1][2] = (*state)[3][2];
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(*state)[3][2] = temp;
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// Rotate third row 3 columns to left
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temp = (*state)[0][3];
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(*state)[0][3] = (*state)[3][3];
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(*state)[3][3] = (*state)[2][3];
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(*state)[2][3] = (*state)[1][3];
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(*state)[1][3] = temp;
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}
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static unsigned char xtime(unsigned char x)
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{
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return ((x << 1) ^ (((x >> 7) & 1) * 0x1b));
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}
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// mix_columns function mixes the columns of the state matrix
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static void mix_columns(state_t *state)
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{
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unsigned char i;
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unsigned char Tmp, Tm, t;
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for (i = 0; i < 4; ++i) {
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t = (*state)[i][0];
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Tmp = (*state)[i][0] ^ (*state)[i][1] ^ (*state)[i][2] ^ (*state)[i][3];
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Tm = (*state)[i][0] ^ (*state)[i][1];
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Tm = xtime(Tm);
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(*state)[i][0] ^= Tm ^ Tmp;
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Tm = (*state)[i][1] ^ (*state)[i][2];
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Tm = xtime(Tm);
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(*state)[i][1] ^= Tm ^ Tmp;
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Tm = (*state)[i][2] ^ (*state)[i][3];
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Tm = xtime(Tm);
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(*state)[i][2] ^= Tm ^ Tmp;
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Tm = (*state)[i][3] ^ t;
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Tm = xtime(Tm);
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(*state)[i][3] ^= Tm ^ Tmp;
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}
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}
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// multiply is used to multiply numbers in the field GF(2^8)
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// Note: The last call to xtime() is unneeded, but often ends up generating a smaller binary
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// The compiler seems to be able to vectorize the operation better this way.
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// See https://github.com/kokke/tiny-AES-c/pull/34
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#define multiply(x, y) \
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( ((y & 1) * x) ^ \
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((y>>1 & 1) * xtime(x)) ^ \
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((y>>2 & 1) * xtime(xtime(x))) ^ \
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((y>>3 & 1) * xtime(xtime(xtime(x)))) ^ \
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((y>>4 & 1) * xtime(xtime(xtime(xtime(x)))))) \
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#define get_sbox_invert(num) (rsbox[(num)])
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// mix_columns function mixes the columns of the state matrix.
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// The method used to multiply may be difficult to understand for the inexperienced.
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// Please use the references to gain more information.
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static void inv_mix_columns(state_t *state)
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{
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int i;
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unsigned char a, b, c, d;
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for (i = 0; i < 4; ++i) {
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a = (*state)[i][0];
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b = (*state)[i][1];
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c = (*state)[i][2];
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d = (*state)[i][3];
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(*state)[i][0] = multiply(a, 0x0e) ^ multiply(b, 0x0b) ^ multiply(c, 0x0d) ^ multiply(d, 0x09);
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(*state)[i][1] = multiply(a, 0x09) ^ multiply(b, 0x0e) ^ multiply(c, 0x0b) ^ multiply(d, 0x0d);
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(*state)[i][2] = multiply(a, 0x0d) ^ multiply(b, 0x09) ^ multiply(c, 0x0e) ^ multiply(d, 0x0b);
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(*state)[i][3] = multiply(a, 0x0b) ^ multiply(b, 0x0d) ^ multiply(c, 0x09) ^ multiply(d, 0x0e);
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}
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}
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// The sub_bytes Function Substitutes the values in the
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// state matrix with values in an S-box.
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static void inv_sub_bytes(state_t *state)
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{
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unsigned char i, j;
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for (i = 0; i < 4; ++i) {
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for (j = 0; j < 4; ++j) {
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(*state)[j][i] = get_sbox_invert((*state)[j][i]);
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}
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}
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}
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static void inv_shift_rows(state_t *state)
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{
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unsigned char temp;
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// Rotate first row 1 columns to right
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temp = (*state)[3][1];
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(*state)[3][1] = (*state)[2][1];
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(*state)[2][1] = (*state)[1][1];
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(*state)[1][1] = (*state)[0][1];
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(*state)[0][1] = temp;
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// Rotate second row 2 columns to right
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temp = (*state)[0][2];
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(*state)[0][2] = (*state)[2][2];
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(*state)[2][2] = temp;
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temp = (*state)[1][2];
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(*state)[1][2] = (*state)[3][2];
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(*state)[3][2] = temp;
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// Rotate third row 3 columns to right
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temp = (*state)[0][3];
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(*state)[0][3] = (*state)[1][3];
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(*state)[1][3] = (*state)[2][3];
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(*state)[2][3] = (*state)[3][3];
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(*state)[3][3] = temp;
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}
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// cipher is the main function that encrypts the PlainText.
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static void cipher(state_t *state, const unsigned char *round_key)
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{
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unsigned char round = 0;
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// Add the First round key to the state before starting the rounds.
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add_round_key(0, state, round_key);
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// There will be Nr rounds.
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// The first Nr-1 rounds are identical.
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// These Nr rounds are executed in the loop below.
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// Last one without mix_columns()
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for (round = 1;; ++round) {
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sub_bytes(state);
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shift_rows(state);
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if (round == Nr) {
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break;
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}
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mix_columns(state);
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add_round_key(round, state, round_key);
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}
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// Add round key to last round
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add_round_key(Nr, state, round_key);
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}
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static void inv_cipher(state_t *state, const unsigned char *round_key)
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{
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unsigned char round = 0;
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// Add the First round key to the state before starting the rounds.
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add_round_key(Nr, state, round_key);
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// There will be Nr rounds.
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// The first Nr-1 rounds are identical.
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// These Nr rounds are executed in the loop below.
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// Last one without InvMixColumn()
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for (round = (Nr - 1);; --round) {
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inv_shift_rows(state);
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inv_sub_bytes(state);
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add_round_key(round, state, round_key);
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if (round == 0) {
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break;
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}
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inv_mix_columns(state);
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}
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}
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void aes_128_ecb_encrypt(const struct aes_ctx *ctx, unsigned char *buf)
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{
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// The next function call encrypts the PlainText with the Key using AES algorithm.
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cipher((state_t *)buf, ctx->round_key);
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}
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void aes_128_ecb_decrypt(const struct aes_ctx *ctx, unsigned char *buf)
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{
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// The next function call decrypts the PlainText with the Key using AES algorithm.
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inv_cipher((state_t *)buf, ctx->round_key);
|
||
}
|