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Hi all, as I need to generate RSA key by modulus and exponent. I have used the OPENSSL before, is it any other choice to do these operation? (NOT OPENSSL)

I have tried to call a static library, and it has a function like this:

exp=010001
why the result is even number? It go into the "IF" condition


int checking(char* exp)
{
int x;
...

How can I do this kind of operation, I want to assign value to the charater pointer

Error occur in free(out);

Yes, SIGABRT is occur...

Hi All, I want to ask about how to assign charater to charater pointer in specify location, is it any problem when I do like this?



char* out = NULL;
out= malloc(11);


for(int i=0; i<5;...

Thanks qny and Salam, the problem have been solved.
I want to ask Salam one more question:

Why the variable c, I don't need to use malloc to allocate the memory?

thanks qny, I have modified the code like this, and the memory leak still occur.



char* a=NULL;
char* b=NULL;
char* c=NULL;

a=malloc(2);
b=malloc(2);

I have created a concate function for pointer:


char* sc(char* left, char* right)
{
int totallen=strlen(left)+strlen(right);
char* output= malloc(totallen+1);
strcpy(output,...

Hi All, I want to change HEX String to Byte Array, but I can't get the expected result.



//Hex String
char* HEXStr="A4505D0B0F6AEDAA";

unsigned char* tmpByte=malloc(9);
for(int i=0; i<16;...

thx all, you all solved my problem, many thanks!!!

Hi All, when I use "free" pointer in C, I got Sigabrt.



char* output=malloc(8*sizeof(char));
output="abcdefg";
printf("%s", output);

free(output); //<----SIGABRT error

Hi All, I want to get the length of char array, but the char array may contain NULL Terminator 0x00, many thanks!!

For Example:


char t1[5];
t1[0]=0x45;
t1[1]=0x46;
t1[2]='\0';
t1[3]=0x47;

Hi all, when I use the function to concat the pointer, the warning message is come out (Incompatible integer to pointer conversion assigning to 'char *' to 'int'), how can I fix this, many thanks!!
...

I just want do "get" "set" like C#, what can I do...

Hi all,

As I want to store data where running a function, then I need to use the data again.

for e.g, when runfunction run only once, it work fine, when it run more than one, the printf will...

Oh, I have passed the char arrary to the RSA function, and the return is that:

out[0]= 41
out[1]= 79
....
that's mean each of the char array store the oct number; therefore, when I...

Hi All,

I have used openssl rsa encrypt function, and the result is in
'unsigned char'. I have tried to display it and check the values, and it also get the expected result.



for(int i=0;...

Hi All, how to get/set char array in C, many thanks!!

Oh,...yes, there is some mistake, and I have modifed it...
I want to ask a question, the plain text pass in to the
DES_ecb3_encrypt function, is it a "hex string"? or I need to change it to ascii...

Here is the key valuekey1, key3= 1313232323231313key2 = 6789678967896789===============================
des_cblock key1,key3,seed = {0x13,0x13,0x23,0x23,0x23,0x23,0x13,0x13}; des_cblock key2 = ...

please help

Hi, whole code as below, _k1,_k2, _k3 change to key1, key2, key3
please give me some hints, many thanks!!





unsigned char out[8];
const char *temp="0592789FFFEDCBA9";
des_cblock...

Hi All,

I am using the OPENSSL to encrypt the plain text, but the output is wrong, can anyone give me hints or solution, many thanks!!



unsigned char out[8];
char...

I have used the stupid method....solved the problem
LOGIC TABLE (HEX)