用單片機測試以下代碼，加解密OK；
aes,c 文件
#include "AES.h"
#include <stdio.h>
#include <string.h>
//#include <assert.h>
static const uint8_t S_BOX[256] = {
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
static const uint8_t INV_S_BOX[256] = {
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
};
static const uint8_t MIX[4][4] = {
{0x02, 0x03, 0x01, 0x01}, {0x01, 0x02, 0x03, 0x01},
{0x01, 0x01, 0x02, 0x03}, {0x03, 0x01, 0x01, 0x02}
};
static const uint8_t INV_MIX[4][4] = {
{0x0e, 0x0b, 0x0d, 0x09}, {0x09, 0x0e, 0x0b, 0x0d},
{0x0d, 0x09, 0x0e, 0x0b}, {0x0b, 0x0d, 0x09, 0x0e}
};
static const uint32_t RCON[10] = {
0x00000001, 0x00000002, 0x00000004, 0x00000008, 0x00000010,
0x00000020, 0x00000040, 0x00000080, 0x0000001B, 0x00000036
};
#ifndef GET_UINT32
#define GET_UINT32(n, b, i) do { \
(n) = ((uint32_t)(b)[(i) ] ) \
| ((uint32_t)(b)[(i) + 1] << 8) \
| ((uint32_t)(b)[(i) + 2] << 16) \
| ((uint32_t)(b)[(i) + 3] << 24); \
} while(0)
#endif
#define ROTL8(x) (((x) << 24) | ((x) >> 8))
#define ROTL16(x) (((x) << 16) | ((x) >> 16))
#define ROTL24(x) (((x) << 8) | ((x) >> 24))
#define SUB_WORD(x) (((uint32_t)S_BOX[(x) & 0xFF]) \
| ((uint32_t)S_BOX[((x) >> 8) & 0xFF] << 8) \
| ((uint32_t)S_BOX[((x) >> 16) & 0xFF] << 16) \
| ((uint32_t)S_BOX[((x) >> 24) & 0xFF] << 24))
static void transport(uint8_t state[BLOCK_SIZE])
{
uint8_t new_state[4][4];
int r, c;
for (r = 0; r < 4; ++r)
for (c = 0; c < 4; ++c)
new_state[r][c] = state[(c << 2) + r];
memcpy(state, new_state, sizeof(new_state));
}
static void add_round_key(uint8_t state[BLOCK_SIZE], const uint8_t key[BLOCK_SIZE])
{
int i;
for (i = 0; i < BLOCK_SIZE; ++i)
state[i] ^= key[i];
}
static void _sub_bytes(uint8_t state[BLOCK_SIZE], const uint8_t *box)
{
int i;
for (i = 0; i < BLOCK_SIZE; ++i)
state[i] = box[state[i]];
}
#define sub_bytes(state) _sub_bytes(state, S_BOX)
#define inv_sub_bytes(state) _sub_bytes(state, INV_S_BOX)
#define _shift_rows(state, OP1, OP2, OP3) do { \
transport(state); \
*(uint32_t *)(state + 4) = OP1(*(uint32_t *)(state + 4)); \
*(uint32_t *)(state + 8) = OP2(*(uint32_t *)(state + 8)); \
*(uint32_t *)(state + 12) = OP3(*(uint32_t *)(state + 12)); \
transport(state); \
} while(0)
#define shift_rows(state) _shift_rows(state, ROTL8, ROTL16, ROTL24)
#define inv_shift_rows(state) _shift_rows(state, ROTL24, ROTL16, ROTL8)
static uint8_t GF_256_multiply(uint8_t a, uint8_t b)
{
uint8_t t[8];
uint8_t ret = 0x00;
int i = 0;
for(i=0;i<8;i++)
{
t[i]=a;
}
for (i = 1; i < 8; ++i) {
t[i] = t[i - 1] << 1;
if (t[i - 1] & 0x80)
t[i] ^= 0x1b;
}
for (i = 0; i < 8; ++i)
ret ^= (((b >> i) & 0x01) * t[i]);
return ret;
}
static void _mix_columns(uint8_t state[BLOCK_SIZE], const uint8_t matrix[][4])
{
uint8_t new_state[BLOCK_SIZE] = { 0 };
int r, c, i;
for (r = 0; r < 4; ++r)
for (c = 0; c < 4; ++c)
for (i = 0; i < 4; ++i)
new_state[(c << 2) + r] ^=
GF_256_multiply(matrix[r][i], state[(c << 2) + i]);
memcpy(state, new_state, sizeof(new_state));
}
#define mix_columns(state) _mix_columns(state, MIX)
#define inv_mix_columns(state) _mix_columns(state, INV_MIX)
static void aes_round(uint8_t state[BLOCK_SIZE], const uint8_t rk[BLOCK_SIZE])
{
sub_bytes(state);
shift_rows(state);
mix_columns(state);
add_round_key(state, rk);
}
static void aes_inv_round(uint8_t state[BLOCK_SIZE], const uint8_t inv_rk[BLOCK_SIZE])
{
inv_shift_rows(state);
inv_sub_bytes(state);
add_round_key(state, inv_rk);
inv_mix_columns(state);
}
static void aes_final_round(uint8_t state[BLOCK_SIZE], const uint8_t rk[BLOCK_SIZE])
{
sub_bytes(state);
shift_rows(state);
add_round_key(state, rk);
}
static void inv_final_round(uint8_t state[BLOCK_SIZE], const uint8_t inv_rk[BLOCK_SIZE])
{
inv_shift_rows(state);
inv_sub_bytes(state);
add_round_key(state, inv_rk);
}
static void key_expansion(aes_context *ctx, const uint8_t *key)
{
// assert(ctx != NULL);
// assert(key != NULL);
uint32_t Nk = ctx->nr - 6;
uint32_t Ek = (ctx->nr + 1) << 2;
uint32_t *RK = ctx->rk;
uint32_t i = 0;
do {
GET_UINT32(RK[i], key, i << 2);
} while(++i < Nk);
do {
uint32_t t = RK[i - 1];
if ((i % Nk) == 0)
t = SUB_WORD(ROTL8(t)) ^ RCON[i / Nk -1];
else if (Nk == 8 && (i % Nk) == 4)
t = SUB_WORD(t);
RK[i] = RK[i - Nk] ^ t;
} while(++i < Ek);
}
//==========================================================
// 函數名稱： aes_set_key
//
// 函數功能： 設置祕鑰長度
//
// 入口參數： *ctx 配置參數 *key 祕鑰
// key_bit 祕鑰位數 16字節 = 128位
// 24字節 = 192位
// 32字節 = 256位
// 返回參數： 1 操作錯誤
// 0 操作成功
//
// 說明：
//==========================================================
unsigned char aes_set_key(aes_context *ctx, const uint8_t *key, uint32_t key_bit)
{
if (ctx == NULL || key == NULL)
return 1;
switch (key_bit) {
case 128: ctx->nr = 10; break;
case 192: ctx->nr = 12; break;
case 256: ctx->nr = 14; break;
default: return 1;
}
ctx->rk = ctx->buf;
key_expansion(ctx, key);
return 0;
}
//==========================================================
// 函數名稱： aes_encrypt_block
//
// 函數功能： aes 加密
//
// 入口參數： *ctx 配置參數 cipher_text 密文數據 text 明文數據
//
// 返回參數： 1 輸入內容錯誤
// 2 錯誤
// 0 炒作成功
// 說明：
//==========================================================
unsigned char aes_encrypt_block(aes_context *ctx,uint8_t cipher_text[BLOCK_SIZE], const uint8_t text[BLOCK_SIZE])
{
uint32_t Nr;
uint32_t *RK;
uint8_t *state;
uint32_t i;
if (ctx == NULL || cipher_text == NULL || text == NULL)
return 1;
if (ctx->rk != ctx->buf)
return 2;
Nr = ctx->nr;
RK = ctx->rk;
state = cipher_text;
memcpy(state, text, BLOCK_SIZE);
add_round_key(state, (const uint8_t *)RK);
for (i = 1; i < Nr; ++i)
aes_round(state, (const uint8_t *)(RK + (i << 2)));
aes_final_round(state, (const uint8_t *)(RK + (Nr << 2)));
return 0;
}
//==========================================================
// 函數功能： aes 解密
//
// 入口參數： *ctx 配置參數 text 明文數據 cipher_text 密文數據
//
// 返回參數： 1 輸入內容錯誤
// 2 錯誤
// 0 炒作成功
// 說明：
//==========================================================
unsigned char aes_decrypt_block(aes_context *ctx,uint8_t text[BLOCK_SIZE], const uint8_t cipher_text[BLOCK_SIZE])
{
uint32_t Nr;
uint32_t *INV_RK;
uint8_t *state;
uint32_t i;
if (ctx == NULL || text == NULL || cipher_text == NULL)
return 1;
if (ctx->rk != ctx->buf)
return 2;
Nr = ctx->nr;
INV_RK = ctx->rk;
state = text;
memcpy(state, cipher_text, BLOCK_SIZE);
add_round_key(state, (const uint8_t *)(INV_RK + (Nr << 2)));
for (i = Nr - 1; i > 0; --i)
aes_inv_round(state, (const uint8_t *)(INV_RK + (i << 2)));
inv_final_round(state, (const uint8_t *)INV_RK);
return 0;
}
aes.h文件
#ifndef AES_AES_H
#define AES_AES_H
#include <stdint.h>
#include <stdlib.h>
//enum {
// //SUCCESS = 0,
// PARM_ERROR = 1,
// NOT_INIT_KEY = 2
//};
#define BLOCK_SIZE 16
typedef struct
{
uint32_t nr; // rounds
uint32_t *rk; // round_key
uint32_t buf[(BLOCK_SIZE+1)<<2]; // store round_keys, each block is 4 bytes
} aes_context;
unsigned char aes_set_key(aes_context *ctx, const uint8_t *key, uint32_t key_bit);
unsigned char aes_encrypt_block(aes_context *ctx, uint8_t cipher_text[16], const uint8_t text[16]);
unsigned char aes_decrypt_block(aes_context *ctx, uint8_t text[16], const uint8_t cipher_text[16]);
#endif //AES_AES_H
主函數測試：
int main(void)
{
uint8_t ret_text[16] = {0};//返回文本
uint8_t text[16] = { //明文文本
0x55,0x66,0x77,0x88,
0x99,0xaa,0xbb,0xcc,
0xee,0xff,0xdd,0x11,
0x22,0x33,0x44,0x55
};
uint8_t cipher_text[16] = {0}; //密文
uint8_t key[16] = { //祕鑰
0x12,0x34,0x56,0x78,
0x90,0x09,0x87,0x65,
0x43,0x21,0x01,0x22,
0x33,0x44,0x55,0x66
};
aes_context ctx;
/*********************************************/
//中間省略一些單片機配置代碼
while(1)
{
if((uart_rx_buf.header == uart_rx_buf.tail) && (uart_rx_buf.header>0))
{
if(uart_rx_buf.data[0]==02)
{
aes_set_key(&ctx, key, 128); //祕鑰配置
aes_encrypt_block(&ctx, cipher_text, text); //加密
uart_cmd(cipher_text,16);
}
if(uart_rx_buf.data[0]==03)
{
aes_decrypt_block(&ctx, ret_text, cipher_text); //解密
uart_cmd(ret_text,16);
}
uart_rx_buf.data[0]=0;
uart_rx_buf.header=0;
}
uart_rx_buf.tail=uart_rx_buf.header;
delay_ms(10);
}