如何使用加密逐位XOR一个文本文件? [英] How to encrypt a text file using bit-wise XOR?
问题描述
我试图通过从另一个文件(keys.txt)上有两个特定按键的左边和右边的字符逐位XOR运算加密从文本文件的消息,但我收到不可读code在原来的文本文件的前面(没有什么变化),这是不对的。我使用两个文本文件:
1)INPUT.TXT - 包含要被加密的消息
2)Keys.txt - 这包含两个字符做XOR运算每个字符在input.txt中(字符1键1和2的性格是关键2)
以下code在我的计划:
海峡[I] = STR [I] ^ STR2 [2];
STR [++ i] = STR [I] ^ STR2 [1];
打破;
是假设要进行XOR运算code行
的注意的我所需要的输出应类似于此:
米@#EMI(> 9S(@)H##FMN XGmmmmU,H!Gmr(DmI\"VmD,F(S!XmU%DmM\"C>U(S>,O)9I(9T?U!D>,M!,E;@#B(Gmu%D4,S(:@$U$O*\"OmU%DmR%H#F!D`V$M!4N8.N DM @#EMKH#9I(+ MMMM)@#B(F
块引用>有人能澄清,我遇到的问题?
用户需要输入:
GCC myProgram.c
./a.outËinput.txt的keys.txt(电子只是站在加密)
#包括LT&;&stdio.h中GT;
#包括LT&;&stdlib.h中GT;
#包括LT&;&string.h中GT;
INT主(整形变量,字符*的argc []){INT I;
INT LEN = 0;
焦炭海峡[1024];
焦炭STR2 [2];
FILE * finp;
FILE *密钥文件;如果(STRCMP(ARGC [1],E)== 0)
{
如果((finp = FOPEN(ARGC [2],R))== NULL)
{
的printf(无法打开文件%s \\ n,ARGC [2]);
出口(1);
} 如果((KEYFILE = FOPEN(ARGC [3],R))== NULL)
{
的printf(无法打开文件%s \\ n,ARGC [3]);
出口(1);
}
而((与fgets(STR,1024,finp)= NULL)及!(与fgets(str2,2,密钥文件)= NULL))
{
的printf(%C \\ N%C,STR2 [1],STR2 [2]);
/ * *** START code使用INPUT.TXT档案与KEYS.TXT *** * /
LEN = strlen的(STR);
对于(i = 0; I< LEN,我++)
{
海峡[I] = STR [I] ^ STR2 [2];
STR [++ i] = STR [I] ^ STR2 [1];
打破;
}
} 的printf(%S \\ n,STR);
FCLOSE(finp);
返回0;}
其他
{
的printf(对不起!);
}
解决方案C数组索引是从零开始的,那么就应该使用
STR2 [0],STR2 [1]
而不是
STR2 [1],STR2 [2]
在此片段
为(i = 0; I< LEN,我++)
{
海峡[I] = STR [I] ^ STR2 [2];
STR [++ i] = STR [I] ^ STR2 [1];
打破;
}第一个循环之后break语句停止循环。你应该将其删除。然后你得到
为(i = 0; I< LEN,我++)
{
海峡[I] ^ = STR2 [1];
STR [++ i] = ^ STR2 [0];
}在行
,而((与fgets(STR,1024,finp)= NULL)及!(与fgets(str2,2,密钥文件)= NULL))
您需要逻辑和按位而不是
,而((与fgets(STR,1024,finp)= NULL)及!&安培;!(与fgets(str2,2,密钥文件)= NULL))
如果你的input.txt的文件中含有较多的1024字节,显示你需要移动printf的所有结果(%S \\ n,STR);进入while循环
,而((与fgets(STR,1024 finp)= NULL)及!&安培;!(与fgets(str2,2,密钥文件)= NULL))
{
...
的printf(%S \\ n,STR);
}I am trying to encrypt a message from a text file by using the bit-wise XOR operation on the left and right characters with two specific keys from another file(keys.txt), but I am receiving unreadable code in front of the original text file(nothing changed), which is not right. I am using two text files:
1) Input.txt - containing the message that is to be encrypted
2) Keys.txt - This contains two characters that do the XOR operation to each character in the input.txt (character 1 is key 1 and character 2 is key 2)
The following code in my program:
str[i]=str[i]^str2[2]; str[++i]=str[i]^str2[1]; break;
is the line of code that is suppose to be performing the XOR operation
Note My desired output should look similar to this:
m@#EmI(>9S(@)H#FmN# XGmmmmU,H!Gmr(DmI"VmD,F(S!XmU%DmM"C>U(S>,O)9I(9T?U!D>,M!,E;@#B(Gmu%D4,S(:@$U$O*"OmU%DmR%H#F!D`V$M!4N8.N Dm@#EmK"H#9I(+mmmm)@#B(f
Can someone clarify the issue that I am running into?
The user should enter:
gcc myProgram.c ./a.out e input.txt keys.txt
(The e just stands for encryption)
#include<stdio.h> #include<stdlib.h> #include<string.h> int main(int args, char *argc[]){ int i; int len=0; char str[1024]; char str2[2]; FILE *finp; FILE *keyFile; if ( strcmp(argc[1], "e") == 0 ) { if ( (finp = fopen(argc[2],"r")) == NULL ) { printf("Could Not Open file %s\n", argc[2]); exit(1); } if ( (keyFile = fopen(argc[3],"r")) == NULL ) { printf("Could Not Open file %s\n", argc[3]); exit(1); } while((fgets(str,1024,finp)!=NULL)&(fgets(str2,2,keyFile)!=NULL)) { printf("%c\n %c",str2[1],str2[2]); /* *** START CODE THAT USES INPUT.TXT FILE & KEYS.TXT *** */ len = strlen(str); for(i=0;i<len;i++) { str[i]=str[i]^str2[2]; str[++i]=str[i]^str2[1]; break; } } printf("%s\n", str); fclose(finp); return 0; } else { printf("SORRY!"); }
解决方案C arrays indexes are zero based, then you should use
str2[0],str2[1]
instead of
str2[1],str2[2]
In this fragment
for(i=0;i<len;i++) { str[i]=str[i]^str2[2]; str[++i]=str[i]^str2[1]; break; }
break statement stop loop after first iteration. You should remove it. Then you get
for(i=0;i<len;i++) { str[i]^=str2[1]; str[++i]^=str2[0]; }
In line
while((fgets(str,1024,finp)!=NULL)&(fgets(str2,2,keyFile)!=NULL))
you need logical AND instead of bitwise
while((fgets(str,1024,finp)!=NULL)&&(fgets(str2,2,keyFile)!=NULL))
And if your input.txt file contain more the 1024 byte to show all results you need to move printf("%s\n", str); into the while loop
while((fgets(str,1024,finp)!=NULL)&&(fgets(str2,2,keyFile)!=NULL)) { ... printf("%s\n", str); }
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