This post contains a total of 19 Hand-Picked C Password Generator examples with Source Code. All these password generators are made using C Programming language.
You can use the source code of these examples with credits to the original owner.
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C Password Generator Examples
1. By Daniel Fragomeli
Made by Daniel Fragomeli. A simple C Password generator program that generates a 11 digit long random password. Source
)U(:R3dlg`F}ag,[t5mpoUW2VKq5Y6jR
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 16
char
a[]="abcdefghijklmnopqrstuvwxyz",
b[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int
i,c[]={1,2,3,4,5,6,7,8,9,0},d;
void passgen() //without symbols
{
for(i=0;i<N;i++){
switch(rand()%3){
case 0:
printf("%c",a[rand()%26]);
break;
case 1:
printf("%c",b[rand()%26]);
break;
case 2:
printf("%d",c[rand()%10]);
break;
}
}
return;
}
void pass_sym(){ //pass with symbols
for(i=0;i<N;i++){
d=33+rand()%94;
printf("%c",d);
}
return;
}
int main()
{
srand(time(NULL));
pass_sym();
passgen();
return 0;
}2. By D Shaw
Made by D Shaw. You can get a random password of the length you entered. Source
10 &RB7H84:ky
#include <stdio.h>
#include <stdlib.h>
void generator( int N )
{
char letters[]={"abcdefghijklmnopqrstuvwxyz"};
char LETTERS[]={"ABCDEFGHIJKLMNOPQRSTUVWXYZ"};
char numbers[]={"1234567890"};
char symbols[]={"_-+*:!?&"};
char password;
int n;
for(int i = 1;i<=N;++i)
{
n = rand()%4;
if(n == 0)
password = letters[ rand()%26 ];
else if(n == 1)
password = LETTERS[ rand()%26 ];
else if(n == 2)
password = numbers[ rand()%11 ];
else
password = symbols[ rand()%9 ];
printf("%c",password);
}
}
int main()
{
int N;
scanf("%d",&N);
generator(N);
return 0;
}
3. By Vamsi
Made by Vamsi. This C program can generate multiple passwords of same length, first enter length after that the numbers of password you need. Source
ENTER REQUIRED LENGTH OF PASSWORD: 8 ENTER NUMBER OF PASSWORDS YOU NEED: 10 nmCvmqrw ZW\k_phj pftGV`tB r[EXlXuj AwvbqxK] CgVdBNDx NJWArhiZ rFxeK_ls L[luZviZ ggDx`TZe
#include<time.h>
#include<stdio.h>
#include<stdlib.h>
int main(void) {
int length;
int num;
int temp;
printf("ENTER REQUIRED LENGTH OF PASSWORD:");
scanf("%d", & length);
printf("ENTER NUMBER OF PASSWORDS YOU NEED:");
scanf("%d", & num);
srand((unsigned int) time(0) + getpid());
while (num--) {
printf("\n");
temp = length;
while (temp--) {
putchar(rand() % 56 + 65);
srand(rand());
}
temp = length;
}
printf("\n");
}4. By Swapnil More
Made by Swapnil More. Enter the length of the password that you want to generate. The password will be generated with a mix of alphabets, numbers and symbols. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() {
int i,n,a,b;
char arr[]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,.-#'?!";
b=strlen(arr);
srand(time(0));
printf("Enter strength of password: ");
scanf("%d",&n);
printf("%d\n",n);
printf("The %d digit password is: ",n);
for(i=0;i<n;i++){
a=rand()%b;
printf("%c",arr[a]);
}
return 0;
}5. By Hasan Vurucu
Made by Hasan Vurucu. First enter what you want to do, whether you want to generate a password or validate it. After that enter the length of the password you want to generate. Source
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>
#include<time.h>
int main()
{
srand(time(NULL));
int methodNumb, i;
printf("Choose the password method you want to use:\n");
while(1)
{
//Choosing the password method
printf("1: Random Generator | 2: Password Validator\n");
scanf("%d", &methodNumb);
if(methodNumb == 1 || methodNumb == 2)
{
break;
}
else
{
("Unvalid choice!\nChoose the method again:\n");
}
}
if(methodNumb == 1)
{
//random password generator by length
int length;
while(1)
{
//Asking for length
printf("Enter the length for your password(Min 8, Max 32): \n");
scanf("%d", &length);
if(length <= 32 && length >= 8)
{
break;
}
else
{
printf("unvalid length!\n");
}
}
int password[length];
for(i = 0; i < length; i++)
{
password[i] = rand() % 93 + 34; //generates a random number between 33 and 126 (33 & 126 included.)
}
printf("Generated password is: ");
//Printing integers as chars.
for(i = 0; i < length; i++)
{
printf("%c", password[i]);
}
}
else if(methodNumb == 2)
{
//User defined, tells the strength (use string functions!)
int strength = 0, i;
char password[256];
printf("Enter a password including at least a lowercase letter, an uppercase letter and a number.\nMin 8, Max 32 characters.\n");
printf("Enter your new password: \n");
while(strength < 3)
{
while(strength < 3)
{
fflush(stdin); //Clear the input buffer after reading the character
gets(password); //User Input
if(strlen(password) > 32 || strlen(password) < 8)
{
printf("Invalid length!\nEnter your new password again(Min 8, Max 32 characters): \n");
}else
{
break;
}
}
//looking for if a number exist.
for(i = 0; i < strlen(password); i++)
{
if(isdigit(password[i]))
{
strength++;
break;
}
}
//looking for if a lowercase letter exist.
for(i = 0; i < strlen(password); i++)
{
if(islower(password[i]))
{
strength++;
break;
}
}
//looking for if a uppercase letter exist.
for(i = 0; i < strlen(password); i++)
{
if(isupper(password[i]))
{
strength++;
break;
}
}
if(strength >= 3)
{
printf("Nice one! Your password has been set!\n");
printf("Your new password is %s", password);
}else
{
strength = 0; //reset strength variable
password[0] = 0; //reset the string with null terminator
printf("Your password is not strong enough!");
printf("Enter a password again: \n");
}
}
}
return 0;
}6. By AsterisK
Made by AsterisK. Enter password length you want between 8 -32. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(){
int len,i,asc= 65, rand_num=0,s_len;
char paswd= '\0';
char search[73] = "[email protected]#$%^&*?AQWERTYUIOPSDFGHJKLMNBVCXZ";
printf("\nthe pasword length should be between 8-32");
printf("\nenter the length of your password: ");
scanf("%d",&len);
srand(time(NULL));
s_len = strlen(search);
//rand_num = rand()%s_len;
if(len<8 || len > 32){
printf("\nplease kindly follow the instruction given above, thank you");
}
else{
printf("\nyour password is:");
for(i=0;i<len;i++){
rand_num = rand()%s_len;
paswd = search[rand_num];
printf("%c",paswd);
}
}
return 0;
}7. By Pringle
Made by Pringle. Enter a password length to generate, must be above 5. Source
#include <stdlib.h>
#include <stdio.h>
#include<time.h>
int main(){
int i,password,len;
srand((unsigned int)time(NULL));
printf("Enter Password Length and must be greater than 5\n");
scanf("%d",&len);
if(len>=5){
for(i=0;i<len;i++){
int k=rand()%128;
if((k>=48&&k<=57)||(k>=65&&k<=90)||(k>=97&&k<=122)||(k>=35&&k<=37)||k==64){
printf("%c",k);
}
else{
i--;
}
}
printf("\n");
}
else{
printf("Length should be greater than 5\n");
}
return(0);
}
8. By zhoolf
Made by zhoolf. Simply enter a decimal number as the length of the password. Source
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
// max and min length for the password
#define PASSWORD_MAX_LEN 200
#define PASSWORD_MIN_LEN 1
// ASCII characters not allowed for a password
#define ASCII_34 34 // double accent
#define ASCII_39 39 // simple accent
#define ASCII_60 60 // less-than sign
#define ASCII_62 62 // greater-than sign
#define ASCII_91 91 // open bracket
#define ASCII_92 92 // reverse slash
#define ASCII_93 93 // close bracket
#define ASCII_123 123 // open keys
#define ASCII_124 124 // vertical slash
#define ASCII_125 125 // close keys
// ASCII characters that are not allowed as the first character of the password
#define ASCII_45 45 // dash
#define ASCII_46 46 // dot
// first and last printable ASCII character
#define ASCII_FIRST 33
#define ASCII_LAST 126
// function prototypes
unsigned int validatePasswordLength (unsigned int);
int validatePasswordFormat (unsigned int, unsigned int);
void generatePassword (unsigned int);
int main()
{
srand((unsigned int)time(NULL));
unsigned int len = 0;
scanf("%u", &len);
generatePassword(len);
return 0;
}
unsigned int
validatePasswordLength (unsigned int len)
{
if (len < PASSWORD_MIN_LEN || len > PASSWORD_MAX_LEN) {
printf("Error: invalid value for length: ");
(len<1) ? printf("password too short") : printf("password too long");
return -1;
}
return 0;
}
int
validatePasswordFormat (unsigned int asciichar, unsigned int index)
{
if (index == 0) {
if ((asciichar == ASCII_45) || (asciichar == ASCII_46))
return -1;
}
switch (asciichar) {
case ASCII_34: case ASCII_39: case ASCII_60: case ASCII_62: case ASCII_91:
case ASCII_92: case ASCII_93: case ASCII_123: case ASCII_124: case ASCII_125:
return -1;
}
return 0;
}
void
generatePassword (unsigned int length)
{
if (validatePasswordLength(length) == -1)
return;
char *passwrd = calloc(length, sizeof(char));
unsigned int idx, asciichar;
for (idx=0; idx < length; idx++) {
do asciichar = (rand()%(ASCII_LAST-ASCII_FIRST+1))+ASCII_FIRST;
while (validatePasswordFormat(asciichar, idx) == -1);
*(passwrd + idx) = asciichar;
}
puts(passwrd);
free(passwrd);
}9. By Sunil Kunwar
Made by Sunil Kunwar. Source
#include <stdio.h>
#include <stdlib.h>
int main()
{
int n,i,r;
printf("enter length of password:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
r=rand()%123;
if(r<35)
{
r=r+35;
}
if(((r>=39)&&(r<=47))||((r>=58)&&(r<=62))||((r>=91)&&(r<=96)))
{
--i;
continue;
}
else
{
printf("%c",r);
}
}
return 0;
}10. By Rachid Elbair
Made by Rachid Elbair. Source
#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int main() {
int i;
char password[10];
char alphabets[]="[email protected]#$&";
srand((unsigned) time(0));
for(i=0;i<10;i++){
password[i]=alphabets[rand()%59];
}
printf("%s\n",password);
return 0;
}11. By Joona Granlund
Made by Joona Granlund. Enter password length to generate a random password containing alphabets, symbols and numbers. Source
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
int main() {
int len, a_len, ra, lol;
scanf("%d", &len);
char all[138] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789012345678901234567890{([])}.&/%%@!?{([])}.&/%%@!?{([])}.&/%%@!?{([])}.&/%%@!?";
a_len = strlen(all);
srand(time(NULL));
char password;
for(int i=0; i<len; i++){
password = all[rand()%a_len];
printf("%c", password);
}
}12. By SURJEET KUMAR
Made by SURJEET KUMAR. The program generates a random 10 digits password. Source
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
int i,len;
srand((unsigned int)time(NULL));
printf("\n\n\n\t\t\t------- PROGRAM TO GENERATE THE PASSWORD OF LENGHT 8 ----- ");
printf("\n");
len=10;
if(len>=5&&len<=20)
{
for(i=0;i<len;i++)
{
int k=rand()%128;
if((k>=48&&k<=57)||(k>=65&&k<=90)||(k>=97&&k<=122)||(k>=35&&k<=37)||k==64)
{
printf("%c",k);
}
else
{
i--;
}
}
printf("\n");
}
else
{
printf("\n\t\t\t LENGTH SHOULD BE GREATER THAN 5 and equal or less than 20 !!! ");
}
return 0;
}13. By ali ghanbari
Made by ali ghanbari. Enter a password length to generate a random password. Source
#include <stdio.h>
#include <time.h>
int main() {
srand(time(NULL));
const int N;
scanf("%d",&N);
char p[N];
for(int i=0;i<N;i++){
p[i] = (rand() % 60)+50;
}
printf("%s",p);
return 0;
}14. By Atiksh Genius
Made by Atiksh Genius. Input password length to generate. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() {
srand(time(0));
char rand_char[72] = "[email protected]#$%^&*?AQWERTYUIOPSDFGHJKLMNBVCXZ";
int input;
scanf("%d", &input);
while(input){
printf("%c", rand_char[rand()%71]);
input--;
}
return 0;
}15. By Dylan Heslop
Made by Dylan Heslop. The program generates a random password that is random in length. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
int length, count, num_count=0, alpha_count=0, sym_count=0;
int rand_num;
char c;
srand(time(NULL));
length = 8 + rand() % 5;//randomly choose length of password 8-12
printf("YOUR PASSWORD IS: ");
for(count=0; count < length; count++)
{
//chose a random number each number corresponds to a character
rand_num = 1 + rand() % 6;
if(rand_num == 1)//select symbol 1/6 probability
{
if(rand() % 2 == 1)//select different sets of symbol
{
c = 33 + rand() % 15;
}else
{
c = 60 + rand() % 5;
}
sym_count++;
}else if(rand_num == 3 || rand_num ==5)//select number 2/6 probability
{
c = 48 + rand() % 10;
num_count++;
}else //3/6 probability (letters)
{
if(rand() % 2 ==1)
{//select upper case letter
c = 65 + rand() % 27;
}else //
{//select lower case letter
c = 97 + rand() % 26;
}
alpha_count++;
}
printf("%c", c);
}//endfor
printf("\nNumber Count: %d\n Alpha Count %d\n Symbol Count %d\n", num_count, alpha_count, sym_count);
return 0;
}16. By rudolph flash
Made by rudolph flash. Enter an integer as the password length you want. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
char* generate(int n) {
char* password = malloc((n + 1) * sizeof(*password));
if (!password)
exit(EXIT_FAILURE);
srand((size_t)time(NULL));
for (int i = 0; i < n; i++)
password[i] = (char)(rand() % 94 + 33);
password[n] = '\0';
return password;
}
int main() {
char* password;
int n;
if (!scanf("%i", &n) || n < 0)
exit(EXIT_FAILURE);
password = generate(n);
if (password) {
printf("Password: %s", password);
free(password);
password = NULL;
}
return 0;
}17. By HonFu
Made by HonFu. A Recursive C Password Generator. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void create_pw(
char* pw, int size, int index) {
if (index==size) {
pw[index] = '\0';
return;
}
else {
create_pw(pw, size, index+1);
do
pw[index] = rand()%94+33;
while(pw[index]=='\\'||pw[index]==96);
}
}
int main() {
int size;
printf("Password generator\n");
printf("------------------\n\n");
printf("Length (8-32 letters)? ");
scanf("%d", &size);
printf("%d", size);
if (size<8||size>32) {
printf("\n\nUnfitting size!");
return 1;
}
char password[size+1];
srand((unsigned)time(NULL));
create_pw(password, size, 0);
printf("\n\nYour password:\n\n");
printf("%s", password);
return 0;
}18. By Harshana Chathuranga
Made by Harshana Chathuranga. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
int a;
int b;
int c;
int d;
int e;
int f = 7;
printf("\n\n");
printf("Please enter the length of the password that you want :\n");
scanf("%d",&e);
printf ("\n\nLength you entered is : %d\n",e)
;
if (e<8 || e>12)
{
printf("\n\nLength must be between 8 - 12");
//main();
}
else
{
printf("\n\n");
for(int i = 0;i<=e;i++)
{
srand(time(&c));
a = c%100;
b = c%10;
d = a + b + f;
if(d>=127)
{
d = d - 70;
}
if(d>=10 && d<=35)
{
d = d + 77;
}
printf("%c",d);
f = f + 10;
}
printf("\n\nThank You..!!\n");
}
return 0;
}19. By Mostafa Ehab
Made by Mostafa Ehab. Enter password length as input, this program will generate a random password by using a set of characters. The length must be between 8 and 32 characters, Numbers, English alphabet (uppercase and lowercase) and symbols (ASCII) are allowed. Spaces, invisible ASCII and non-ASCII characters are not. Source
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() {
time_t t;
srand(time(&t));
int len;
scanf("%i", &len);
if (len < 8 || len > 32)
{
printf("Invalid length\n");
return 1;
}
printf("Your password: ");
for(int i = 0; i < len; i++)
{
char r = (rand() % 93) + 33;
printf("%c", r);
}
return 0;
}20. By Nicolas Kaiser
Made by Nicolas Kaiser. Enter password length between 8 -32 to generate a random password. Source
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
const char cset[] = "[email protected]#$/^&*()-\'\":;,?+=%_<>{}[]`~\\|.";
int main(int argc, char *argv[]) {
int i, n;
scanf("%d", &n);
if (n < 8 || n > 32) {
printf("Input %d is not between 8 and 32.", n);
return 0;
}
srand(time(NULL));
for (int i = 0; i < n; i++) {
putchar(cset[rand() % sizeof(cset)]);
}
putchar('\n');
return 0;
}