Openssl Pipes with C Help?

[Sundown G]

Look my program read all lines from (plain.txt) and save temporary every read strings line by line into another text called(all.txt), i made the md5sum hash on each line separately of (all.txt) and saving this hashes on calculating.txt... then delete the all.txt and calculating.txt, creating a new copy of calculating (hashes.txt)

I want to do this process one-way only with the command
with array or something without using files.

echo -n (read string line) | openssl md5

plain.txt
a
b
c
d
e
f
g

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define Plain "plain.txt" 

int main(){

    FILE *fp;
    FILE *read_fp;
    FILE *read_tmp;
    int chars_read;
    char hash[1024] = "openssl dgst -md5 all.txt >> calculating.txt";
    char buffer[1024];
    char line[128];

    if ((fp = fopen(Plain, "r")) == NULL){
    perror (Plain);
    return (EXIT_FAILURE);
       }

    printf("\tCreating Hash Table. Please wait....\n" );

    while(!feof(fp))
    {
        fscanf(fp,"%s", &line);

        read_tmp = fopen("all.txt","w+");
        fprintf(read_tmp,"%s", &line);
        fclose(read_tmp); 


        read_fp = popen(hash,"r");
        if (read_fp != NULL) {
            while ((chars_read = fread(buffer, sizeof(char), 1024 , read_fp)) > 0 ){
            }
            pclose(read_fp);
        }
    }

    fclose(fp);
    system("sed '$d' calculating.txt > hashes.txt");
    system("rm all.txt");
    system("rm calculating.txt");
    printf("Hashes Calculated Successfully... [OK!]\n");

    return 0;
}

[Salem]

You mean like this?

$ while read line ; do b=$(echo $line | openssl dgst -md5); echo "$line $b"; done < plain.txt 
a 60b725f10c9c85c70d97880dfe8191b3
b 3b5d5c3712955042212316173ccf37be
c 2cd6ee2c70b0bde53fbe6cac3c8b8bb1
d e29311f6f1bf1af907f9ef9f44b8328b
e 9ffbf43126e33be52cd2bf7e01d627f9
f 9a8ad92c50cae39aa2c5604fd0ab6d8c

[Sundown G]

yes but the plaintext in one file and hashes in a second text! separately !

[Sundown G]

nvm!delete this thread! i solve it