\u8981\u5b9e\u73b0ChaCha20\u52a0\u5bc6\u5728\u5355\u7247\u673a\uff08\u5982STM32\u3001Arduino\u7b49\uff09\u7684\u4e32\u53e3\u6570\u636e\u4f20\u8f93\u4e2d\uff0c\u9996\u5148\u9700\u8981\u7406\u89e3ChaCha20\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u6d41\u52a0\u5bc6\u7b97\u6cd5\uff0c\u9002\u7528\u4e8e\u8d44\u6e90\u6709\u9650\u7684\u5d4c\u5165\u5f0f\u7cfb\u7edf\u3002\u5b83\u4f7f\u7528256\u4f4d\u5bc6\u94a5\uff08\u6216128\u4f4d\uff09\u548cnonce\u751f\u6210\u5bc6\u94a5\u6d41\uff0c\u7136\u540e\u901a\u8fc7XOR\u64cd\u4f5c\u52a0\u5bc6\/\u89e3\u5bc6\u6570\u636e\u6d41\u3002\u4e32\u53e3\uff08UART\uff09\u4f20\u8f93\u65f6\uff0c\u53ef\u4ee5\u5728\u53d1\u9001\u6570\u636e\u524d\u52a0\u5bc6\uff0c\u5728\u63a5\u6536\u7aef\u89e3\u5bc6\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u662f\u5b8c\u6574\u7684ChaCha20\u5b9e\u73b0\u4ee3\u7801\uff08\u63d0\u53d6\u81ea\u5f00\u6e90\u5b9e\u73b0\uff0c\u652f\u63018\/12\/20\u8f6e\uff09\u3002\u4f60\u53ef\u4ee5\u76f4\u63a5\u590d\u5236\u5230\u4f60\u7684\u9879\u76ee\u4e2d\uff0c\u653e\u5728chacha.h\u548cchacha.c\u6587\u4ef6\u4e2d\u3002 10<\/p>\n\n\n\n
chacha.h\uff08\u5934\u6587\u4ef6\uff09\uff1a<\/p>\n\n\n\n
typedef struct {
uint32_t state[16];
uint8_t keystream[64];
size_t pos;
uint_t nr;
} ChachaContext;<\/p>\n\n\n\n
typedef int error_t; \/\/ \u7b80\u5355\u5b9a\u4e49\u9519\u8bef\u7c7b\u578b\uff0c0\u4e3a\u6210\u529f\uff0c\u975e0\u4e3a\u5931\u8d25<\/p>\n\n\n\n
error_t chachaInit(ChachaContext *context, uint_t nr, const uint8_t *key,
size_t keyLen, const uint8_t *nonce, size_t nonceLen);<\/p>\n\n\n\n
void chachaCipher(ChachaContext *context, const uint8_t *input,
uint8_t *output, size_t length);<\/p>\n\n\n\n
void chachaDeinit(ChachaContext *context);<\/p>\n\n\n\n
((uint32_t)(((uint8_t *)(p))[0]) << 0) | \\\n((uint32_t)(((uint8_t *)(p))[1]) << 8) | \\\n((uint32_t)(((uint8_t *)(p))[2]) << 16) | \\\n((uint32_t)(((uint8_t *)(p))[3]) << 24) \\<\/code><\/pre>\n\n\n\n)<\/p>\n\n\n\n
define STORE32LE(p, v) \\<\/h1>\n\n\n\n
{ \\
uint32_t x = (v); \\
((uint8_t *)(p))[0] = (uint8_t)(x >> 0); \\
((uint8_t *)(p))[1] = (uint8_t)(x >> 8); \\
((uint8_t *)(p))[2] = (uint8_t)(x >> 16); \\
((uint8_t *)(p))[3] = (uint8_t)(x >> 24); \\
}<\/p>\n\n\n\n
define ROL32(a, n) (((a) << (n)) | ((a) >> (32 – (n))))<\/h1>\n\n\n\ndefine MIN(a, b) (((a) < (b)) ? (a) : (b))<\/h1>\n\n\n\nendif<\/h1>\n\n\n\n
chacha.c\uff08\u6e90\u6587\u4ef6\uff09\uff1a
`c<\/p>\n\n\n\n
include “chacha.h”<\/h1>\n\n\n\ninclude \/\/ \u7528\u4e8ememset<\/h1>\n\n\n\ndefine QUARTER_ROUND(a, b, c, d) \\<\/h1>\n\n\n\n
{ \\
a += b; \\
d ^= a; \\
d = ROL32(d, 16); \\
c += d; \\
b ^= c; \\
b = ROL32(b, 12); \\
a += b; \\
d ^= a; \\
d = ROL32(d, 8); \\
c += d; \\
b ^= c; \\
b = ROL32(b, 7); \\
}<\/p>\n\n\n\n
error_t chachaInit(ChachaContext *context, uint_t nr, const uint8_t *key,
size_t keyLen, const uint8_t *nonce, size_t nonceLen)
{
uint32_t *w;<\/p>\n\n\n\n
if (context == NULL key == NULL nonce == NULL)
return ERROR_INVALID_PARAMETER;<\/p>\n\n\n\n
if (nr != 8 && nr != 12 && nr != 20)
return ERROR_INVALID_PARAMETER;<\/p>\n\n\n\n
context->nr = nr;
w = context->state;<\/p>\n\n\n\n
if (keyLen == 16)
{
w[0] = 0x61707865;
w[1] = 0x3120646E;
w[2] = 0x79622D36;
w[3] = 0x6B206574;
w[4] = LOAD32LE(key);
w[5] = LOAD32LE(key + 4);
w[6] = LOAD32LE(key + 8);
w[7] = LOAD32LE(key + 12);
w[8] = LOAD32LE(key);
w[9] = LOAD32LE(key + 4);
w[10] = LOAD32LE(key + 8);
w[11] = LOAD32LE(key + 12);
}
else if (keyLen == 32)
{
w[0] = 0x61707865;
w[1] = 0x3320646E;
w[2] = 0x79622D32;
w[3] = 0x6B206574;
w[4] = LOAD32LE(key);
w[5] = LOAD32LE(key + 4);
w[6] = LOAD32LE(key + 8);
w[7] = LOAD32LE(key + 12);
w[8] = LOAD32LE(key + 16);
w[9] = LOAD32LE(key + 20);
w[10] = LOAD32LE(key + 24);
w[11] = LOAD32LE(key + 28);
}
else
{
return ERROR_INVALID_PARAMETER;
}<\/p>\n\n\n\n
if (nonceLen == 8)
{
w[12] = 0;
w[13] = 0;
w[14] = LOAD32LE(nonce);
w[15] = LOAD32LE(nonce + 4);
}
else if (nonceLen == 12)
{
w[12] = 0;
w[13] = LOAD32LE(nonce);
w[14] = LOAD32LE(nonce + 4);
w[15] = LOAD32LE(nonce + 8);
}
else if (nonceLen == 16)
{
w[12] = LOAD32LE(nonce);
w[13] = LOAD32LE(nonce + 4);
w[14] = LOAD32LE(nonce + 8);
w[15] = LOAD32LE(nonce + 12);
}
else
{
return ERROR_INVALID_PARAMETER;
}<\/p>\n\n\n\n
context->pos = 0;
return NO_ERROR;
}<\/p>\n\n\n\n
void chachaCipher(ChachaContext *context, const uint8_t *input,
uint8_t *output, size_t length)
{
uint_t i;
uint_t n;
uint8_t *k;<\/p>\n\n\n\n
while (length > 0)
{
if (context->pos == 0 || context->pos >= 64)
{
chachaProcessBlock(context);
context->state[12]++;
if (context->state[12] == 0)
{
context->state[13]++;
}
context->pos = 0;
}<\/p>\n\n\n\n
n = MIN(length, 64 - context->pos);\n if (output != NULL)\n {\n k = context->keystream + context->pos;\n if (input != NULL)\n {\n for (i = 0; i < n; i++)\n {\n output[i] = input[i] ^ k[i];\n }\n }\n else\n {\n for (i = 0; i < n; i++)\n {\n output[i] = k[i];\n }\n }\n }\n\n context->pos += n;\n length -= n;<\/code><\/pre>\n\n\n\n}
}<\/p>\n\n\n\n
static void chachaProcessBlock(ChachaContext *context)
{
uint_t i;
uint32_t w[16];<\/p>\n\n\n\n
for (i = 0; i < 16; i++) { w[i] = context->state[i];
}<\/p>\n\n\n\n
for (i = 0; i < context->nr; i += 2)
{
QUARTER_ROUND(w[0], w[4], w[8], w[12]);
QUARTER_ROUND(w[1], w[5], w[9], w[13]);
QUARTER_ROUND(w[2], w[6], w[10], w[14]);
QUARTER_ROUND(w[3], w[7], w[11], w[15]);<\/p>\n\n\n\n
QUARTER_ROUND(w[0], w[5], w[10], w[15]);\n QUARTER_ROUND(w[1], w[6], w[11], w[12]);\n QUARTER_ROUND(w[2], w[7], w[8], w[13]);\n QUARTER_ROUND(w[3], w[4], w[9], w[14]);<\/code><\/pre>\n\n\n\n}<\/p>\n\n\n\n
for (i = 0; i < 16; i++) { w[i] += context->state[i];
}<\/p>\n\n\n\n
for (i = 0; i < 16; i++) { STORE32LE(context->keystream + i * 4, w[i]);
}
}<\/p>\n\n\n\n
void chachaDeinit(ChachaContext *context)
{
memset(context, 0, sizeof(ChachaContext));
}<\/p>\n\n\n\n
\u793a\u4f8b\uff1a\u96c6\u6210\u5230\u5355\u7247\u673a\u4e32\u53e3\u4f20\u8f93<\/h3>\n\n\n\n
\u5047\u8bbe\u4f7f\u7528STM32\u5355\u7247\u673a\uff08\u4f7f\u7528HAL\u5e93\uff09\uff0c\u4ee5\u4e0b\u662f\u53d1\u9001\u7aef\u52a0\u5bc6\u5e76\u4f20\u8f93\u7684\u793a\u4f8b\u4ee3\u7801\u3002\u63a5\u6536\u7aef\u7c7b\u4f3c\uff0c\u53ea\u9700\u8c03\u7528\u89e3\u5bc6\uff08chachaCipher\u51fd\u6570\u5bf9\u79f0\uff09\u3002<\/p>\n\n\n\n
c<\/p>\n\n\n\n
include “chacha.h”<\/h1>\n\n\n\ninclude “stm32f4xx_hal.h” \/\/ \u5047\u8bbeSTM32F4\u7cfb\u5217\uff0c\u66ff\u6362\u4e3a\u4f60\u7684\u82af\u7247<\/h1>\n\n\n\n
extern UART_HandleTypeDef huart1; \/\/ \u4f60\u7684UART\u53e5\u67c4<\/p>\n\n\n\n
int main(void) {
ChachaContext context;
uint8_t key[32] = {0x00, 0x01, \u2026}; \/\/ 32\u5b57\u8282\u5bc6\u94a5\uff0c\u81ea\u884c\u586b\u5145
uint8_t nonce[12] = {0x00, 0x00, \u2026}; \/\/ 12\u5b57\u8282nonce
uint8_t plaintext[100] = “Hello, World!”; \/\/ \u8981\u53d1\u9001\u7684\u6570\u636e
uint8_t ciphertext[100];
size_t dataLen = strlen((char*)plaintext);<\/p>\n\n\n\n
\/\/ \u521d\u59cb\u5316ChaCha\nchachaInit(&context, 20, key, 32, nonce, 12); \/\/ 20\u8f6e\uff0c32\u5b57\u8282\u5bc6\u94a5\uff0c12\u5b57\u8282nonce\n\n\/\/ \u52a0\u5bc6\u6570\u636e\nchachaCipher(&context, plaintext, ciphertext, dataLen);\n\n\/\/ \u901a\u8fc7\u4e32\u53e3\u53d1\u9001\u52a0\u5bc6\u6570\u636e\nHAL_UART_Transmit(&huart1, ciphertext, dataLen, HAL_MAX_DELAY);\n\n\/\/ \u6e05\u7406\nchachaDeinit(&context);\n\nwhile(1);<\/code><\/pre>\n\n\n\n}
`<\/p>\n\n\n\n
\n- \u63a5\u6536\u7aef\uff1a\u7c7b\u4f3c\u521d\u59cb\u5316ChaCha\uff08\u76f8\u540c\u5bc6\u94a5\u548cnonce\uff09\uff0c\u63a5\u6536\u6570\u636e\u540e\u8c03\u7528
chachaCipher(&context, ciphertext, plaintext, dataLen);<\/code>\u89e3\u5bc6\u3002<\/li>\n\n\n\n- Arduino\u793a\u4f8b\uff1a\u66ff\u6362HAL\u4e3a
Serial.write(ciphertext, dataLen);<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n\u5982\u679c\u4f60\u7684\u5355\u7247\u673a\u662f\u5176\u4ed6\u7c7b\u578b\uff08\u59828051\uff09\uff0c\u9700\u8981\u8c03\u6574UART\u51fd\u6570\u3002\u6d4b\u8bd5\u65f6\uff0c\u53ef\u4ee5\u5148\u5728PC\u4e0a\u7f16\u8bd1\u9a8c\u8bc1\uff0c\u7136\u540e\u79fb\u690d\u5230\u5355\u7247\u673a\u3002ChaCha20\u6548\u7387\u9ad8\uff0c\u9002\u5408\u4f4e\u529f\u8017\u8bbe\u5907\u3002\u5982\u679c\u9700\u8981Poly1305\u8ba4\u8bc1\uff08ChaCha20-Poly1305\uff09\uff0c\u53ef\u4ee5\u6269\u5c55\u5b9e\u73b0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8981\u5b9e\u73b0ChaCha20\u52a0\u5bc6\u5728\u5355\u7247\u673a\uff08\u5982STM32\u3001Arduino\u7b49\uff09\u7684\u4e32\u53e3\u6570\u636e\u4f20\u8f93\u4e2d\uff0c\u9996\u5148\u9700\u8981\u7406\u89e3ChaCha … <\/p>\n