Apr 28, 2012

C program to Encrypt and Decrypt a password

C Strings:
Write a C program to Encryption and Decryption of password.
In this program we encrypt the given string by subtracting the hex value from it. Password encryption is required for the security reason, You can use so many functions like hash or other keys to encrypt. Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.
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#include <stdio.h>
#include <string.h>

void encrypt(char password[],int key)
{
    unsigned int i;
    for(i=0;i<strlen(password);++i)
    {
        password[i] = password[i] - key;
    }
}

void decrypt(char password[],int key)
{
    unsigned int i;
    for(i=0;i<strlen(password);++i)
    {
        password[i] = password[i] + key;
    }
}
int main()
{
    char password[20] ;
    printf("Enter the password: \n ");
    scanf("%s",password);
    printf("Passwrod     = %s\n",password);
    encrypt(password,0xFACA);
    printf("Encrypted value = %s\n",password);
    decrypt(password,0xFACA);
    printf("Decrypted value = %s\n",password);
    return 0;
}
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