任务详情
0. 在openEuler(推荐)或Ubuntu或Windows(不推荐)中完成下面任务 1 参考《GMT 0009-2012 SM2密码算法使用规范》第6节“数据转换” 在附件中的utils.h和utils.c中完成位串与8位字节串的转换功能(10'): int Bitstr2ByteArr(unsigned char * bs, unsigned char * ba,int *lba); int ByteArr2Bitstr(unsigned char * ba, unsigned char * bs, int *lbs); 2 并写出测试代码测试上述函数(不能与下面代码一样),比如(10'): unsigned char bs [] = "1010010100011100"; int len; Bitstr2ByteArr(bs, char * ba, &len); //结果:ba = “051C”; len=2 char ba[] = "051C"; ByteArr2Bitstr(char * ba, char * bs); //结果:bs= "1010010100011100" 3 提交代码(或代码链接)和运行结果
//utils.c #include<stdio.h> #include<string.h> #include"utils.h" int Hex2Char(int fromi,char *toc) { if(fromi>=0&&fromi<=9) { *toc= fromi+'0'; } else if(fromi>=10&&fromi<=15) { *toc = fromi+'A'-10; } else { printf("error"); } return 0; } int Char2Hex(char fromc,int *toi) { if(fromc>='0'&& fromc<='9') { *toi= fromc-'0'; } else if(fromc>='A'&& fromc<='F') { *toi= fromc-'A'+10; } else { printf("error"); } return 0; } int ByteArr2BitStr(char *ba,char *bs) { int i,j,L,k,a; L = strlen(ba); for(j=0;j<L;j++) { Char2Hex(ba[j],&a); for(i=0;i<4;i++) { bs[3*(j+1)-i+j] = a%2+'0'; a=a/2; } } bs[4*L]='\0'; } int BitStr2ByteArr(char *bs,char *ba){ int i,k,j,L; L = strlen(bs); char string[100];int sum=0; if(L%4==1) { strcpy(string,"000"); strcat(string,bs); k=L/4+1; } else if(L%4==2) { strcpy(string,"00"); strcat(string,bs); k=L/4+1; } else if(L%4==3) { strcpy(string,"0");; strcat(string,bs); k=L/4+1; } else { k=L/4; strcpy(string,bs); } for(i=0;i<k;i++) { for(j=0;j<4;j++) { sum=sum*2; sum=sum+(string[4*i+j]-'0'); } Hex2Char(sum,&ba[i]); sum=0; } ba[i]='\0'; }
//utils.h #ifndef _UTIL_H_ #define _UTIL_H_ //char Hex2Char(int i); //int Char2Hex(char c); int Hex2Char(int fromi,char * toc); int Char2Hex(char fromc,int * toi); int Bitstr2ByteArr(char * bs,char * ba); int ByteArr2Bitstr(char * ba,char * bs); int Int2ByteArr(int i,char * ba); int ByteArr2Int(char * ba,int * i); #endif
//main.c #include<stdio.h> #include"utils.h" int main(){ char ba[100]; char bs[100]; printf("input ByteArr:"); scanf("%s",ba); ByteArr2BitStr(ba,bs); printf("bitstr:"); printf("%s\n",bs); char baa[100]; char bss[100]; printf("input bitstr:"); scanf("%s",bss); BitStr2ByteArr(bss,baa); printf("ByteArr:"); printf("%s\n",baa); return 0; }
运行结果: