unsigned char A= 0x1d; uint8_t

A=0x1d; 这两个语句有什么区别呢？

这两个语句的作用是相同的，都是将十六进制数0x1d赋值给A。但是，unsigned char和uint8_t是不同的类型定义，unsigned char是标准库中的类型定义，而uint8_t是C99标准中新增的类型定义。在大多数情况下，这两种类型的大小和取值范围是相同的，但是在某些特殊的情况下可能会有所不同。

相关问题

sm3算法的c实现(代码)

下面是一个简单的 SM3 算法的 C 语言实现代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#define ROTL(x, n) (((x) << (n)) | ((x) >> (32 - (n))))

const uint32_t IV[8] = {
    0x7380166F, 0x4914B2B9, 0x172442D7, 0xDA8A0600,
    0xA96F30BC, 0x163138AA, 0xE38DEE4D, 0xB0FB0E4E
};

const uint32_t T[64] = {
    0x79CC4519, 0xF3988A32, 0xE7311465, 0xCE622A8B,
    0x9CC45197, 0x3988A32F, 0x7311465E, 0xE622A8BC,
    0xCC451979, 0x988A32F3, 0x311465E7, 0x622A8BCE,
    0xC451979C, 0x88A32F39, 0x11465E73, 0x22A8BCE6,
    0x9D8A7A87, 0x3B14F50E, 0x7629EA1D, 0xEC53D43A,
    0xD8A7A879, 0xB14F50E3, 0x629EA1D7, 0xC53D43AE,
    0x8A7A879D, 0x14F50E3B, 0x29EA1D76, 0x53D43AEC,
    0xA7A879D8, 0x4F50E3B1, 0x9EA1D762, 0x3D43AEC5,
    0x7A879D8A, 0xF50E3B14, 0xEA1D7629, 0xD43AEC53,
    0xA879D8A7, 0x50E3B14F, 0xA1D7629E, 0x43AEC53D,
    0x879D8A7A, 0x0E3B14F5, 0x1D7629EA, 0x3AEC53D4,
    0x79D8A7A8, 0xF0E3B14F, 0xE1D7629E, 0xC3AEC53D,
    0x9D8A7A87, 0xB0E3B14F, 0x61D7629E, 0xC3AEC53C,
    0x38A7A879, 0x70E3B14F, 0xE1D7629E, 0xC3AEC53D,
    0x1D8A7A87, 0x3B0E3B14, 0x762D7629, 0xEC5AEC53,
    0x3B14F50E, 0x7629EA1D, 0xEC53D43A, 0xD43AEC53
};

void sm3_compress(uint32_t *state, const unsigned char *block) {
    uint32_t A, B, C, D, E, F, G, H;
    uint32_t W[68], SS1, SS2, TT1, TT2;

    for (int i = 0; i < 16; ++i) {
        W[i] = ((uint32_t) block[4 * i + 0] << 24) |
               ((uint32_t) block[4 * i + 1] << 16) |
               ((uint32_t) block[4 * i + 2] << 8) |
               ((uint32_t) block[4 * i + 3] << 0);
    }

    for (int i = 16; i < 68; ++i) {
        W[i] = ROTL(W[i - 16] ^ W[i - 9] ^ ROTL(W[i - 3], 15), 1);
    }

    for (int i = 0; i < 64; ++i) {
        SS1 = ROTL(ROTL(A, 12) + E + ROTL(T[i], i % 32), 7);
        SS2 = SS1 ^ ROTL(A, 12);
        TT1 = FF0(A, B, C) + D + SS2 + W[i];
        TT2 = GG0(E, F, G) + H + SS1 + W[i];
        D = C;
        C = ROTL(B, 9);
        B = A;
        A = TT1;
        H = G;
        G = ROTL(F, 19);
        F = E;
        E = P0(TT2);
    }

    for (int i = 0; i < 8; ++i) {
        state[i] ^= A;
        A = B;
        B = C;
        C = D;
        D = E;
        E = F;
        F = G;
        G = H;
        H = state[i];
    }
}

void sm3_hash(const unsigned char *data, size_t len, unsigned char *hash) {
    uint32_t state[8];
    uint64_t n = len * 8;
    uint32_t K[4];
    unsigned char buffer[64];
    int i, off;

    state[0] = IV[0];
    state[1] = IV[1];
    state[2] = IV[2];
    state[3] = IV[3];
    state[4] = IV[4];
    state[5] = IV[5];
    state[6] = IV[6];
    state[7] = IV[7];

    while (len >= 64) {
        sm3_compress(state, data);
        data += 64;
        len -= 64;
    }

    off = 0;
    for (i = 0; i < len; ++i) {
        buffer[i] = data[i];
    }

    buffer[i++] = 0x80;

    if (i > 56) {
        for (int j = i; j < 64; ++j) {
            buffer[j] = 0x00;
        }
        sm3_compress(state, buffer);
        i = 0;
    }

    for (int j = i; j < 56; ++j) {
        buffer[j] = 0x00;
    }

    K[0] = (uint32_t) ((n >> 32) & 0xFFFFFFFF);
    K[1] = (uint32_t) ((n >> 0) & 0xFFFFFFFF);
    K[2] = (uint32_t) ((n >> 32) & 0xFFFFFFFF);
    K[3] = (uint32_t) ((n >> 0) & 0xFFFFFFFF);

    memcpy(buffer + 56, K, 16);

    sm3_compress(state, buffer);

    for (int i = 0; i < 8; ++i) {
        hash[4 * i + 0] = (unsigned char) (state[i] >> 24);
        hash[4 * i + 1] = (unsigned char) (state[i] >> 16);
        hash[4 * i + 2] = (unsigned char) (state[i] >> 8);
        hash[4 * i + 3] = (unsigned char) (state[i] >> 0);
    }
}

uint32_t FF0(uint32_t X, uint32_t Y, uint32_t Z) {
    return X ^ Y ^ Z;
}

uint32_t FF1(uint32_t X, uint32_t Y, uint32_t Z) {
    return (X & Y) | (X & Z) | (Y & Z);
}

uint32_t GG0(uint32_t X, uint32_t Y, uint32_t Z) {
    return X ^ Y ^ Z;
}

uint32_t GG1(uint32_t X, uint32_t Y, uint32_t Z) {
    return (X & Y) | (~X & Z);
}

uint32_t P0(uint32_t X) {
    return X ^ ROTL(X, 9) ^ ROTL(X, 17);
}

uint32_t P1(uint32_t X) {
    return X ^ ROTL(X, 15) ^ ROTL(X, 23);
}

注意：这只是一个简单的实现，实际应用中需要考虑更多的细节，比如输入数据的字节序、数据长度的处理等。

STC8H8K64U蜂鸣器唱歌代码

以下是STC8H8K64U蜂鸣器唱歌的代码：

#include "stc8h8k.h"

#define uchar unsigned char
#define uint unsigned int

uchar code music[] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff};

uchar code tone[] = {0x00, 0x3f, 0x3c, 0x3a, 0x37, 0x35, 0x32, 0x30, 0x2e, 0x2b, 0x29, 0x26, 0x24, 0x21, 0x1f, 0x1c, 0x1a, 0x17, 0x15, 0x12, 0x10, 0x0e, 0x0b, 0x09, 0x06, 0x04, 0x01};

void delay(uint i)
{
    while(i--);
}

void main()
{
    uchar i, j;
    P2M1 = 0x00;
    P2M0 = 0x00;
    while(1)
    {
        for(i = 0; i < sizeof(music); i++)
        {
            for(j = 0; j < 100; j++)
            {
                P2 = tone[music[i]];
                delay(100);
                P2 = 0x00;
                delay(100);
            }
        }
    }
}