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

int main() {
    FILE * fp;
    char algo[20]={0},key[1000],userHost[100],cha;
    printf("Key Algorithm? (ssh-rsa,ssh-ed25519,etc.)\n: ");
    int i=0;
    fp=fopen("/tmp/ssh_authorized_keys","a");
    while((cha=getchar())!='\n'&&cha!=EOF){
        algo[i]=cha;
        i++;
    }
    algo[i]='\0';
    i=0;
    while(algo[0]!='.'){
        printf("Public Key\n: ");
        while((cha=getchar())!='\n'&&cha!=EOF){
                key[i]=cha;
                i++;
        }
        key[i]='\0';
        i=0;
        printf("Username and Host? (you@example.com)\n: ");
        while((cha=getchar())!='\n'&&cha!=EOF){
                userHost[i]=cha;
                i++;
        }
        userHost[i]='\0';
        i=0;
        fprintf(fp,"%s %s %s\n", algo,key,userHost);
        printf("Next Key Algorithm? (Enter");
        putchar('"');
        putchar('.');
        putchar('"');
        printf("to stop adding keys)\n: ");
        while((cha=getchar())!='\n'&&cha!=EOF){
                algo[i]=cha;
                i++;
        }
        algo[i]='\0';
        i=0;

    }
    fclose(fp);
    printf("Output has been saved to /tmp/ssh_authorized_keys\nYou can safely close this window now.");
    return 0;
}