Password hasher with options in English language

Password hasher with options in English language

passwordHasher_US.js

@@ -0,0 +1,166 @@
+const bcrypt = require('bcrypt');
+const fs = require('fs');
+const readline = require('readline').createInterface({
+    input: process.stdin,
+    output: process.stdout
+});
+
+function generateSalt(costFactor = 12) {
+    return bcrypt.genSaltSync(costFactor);
+}
+
+function hashPassword(password, salt) {
+    return bcrypt.hashSync(password, salt);
+}
+
+function verifyPassword(hashedPassword, password) {
+    return bcrypt.compareSync(password, hashedPassword);
+}
+
+function saveToFile(salt, hashedPassword, filename) {
+    const data = {
+        salt: salt,
+        hashedPassword: hashedPassword
+    };
+    fs.writeFileSync(filename, JSON.stringify(data, null, 2));
+}
+
+function loadFromFile(filename) {
+    const data = JSON.parse(fs.readFileSync(filename, 'utf8'));
+    return {
+        salt: data.salt,
+        hashedPassword: data.hashedPassword
+    };
+}
+
+function getCostFactor() {
+    return new Promise((resolve) => {
+        readline.question("Enter the cost factor (default 12, typically between 4 and 31): ", (costFactorInput) => {
+            if (costFactorInput === '') {
+                resolve(12); // Use the default value if the user enters nothing
+            } else {
+                const costFactor = parseInt(costFactorInput, 10);
+                if (isNaN(costFactor) || costFactor < 4 || costFactor > 31) {
+                    console.log("The cost factor must be between 4 and 31. Please try again.");
+                    resolve(getCostFactor());
+                } else {
+                    resolve(costFactor);
+                }
+            }
+        });
+    });
+}
+
+async function main() {
+    while (true) {
+        console.log("\nOptions:");
+        console.log("1. Enter a password and generate a hash.");
+        console.log("2. Verify the match between a hash and a password.");
+        console.log("3. Save the salt and hash to a file.");
+        console.log("4. Load the salt and hash from a file.");
+        console.log("5. Enter multiple passwords and generate hashes.");
+        console.log("6. Quit.");
+
+        const choice = await new Promise((resolve) => {
+            readline.question("Choose an option (1/2/3/4/5/6): ", (answer) => {
+                resolve(answer);
+            });
+        });
+
+        if (choice === '1') {
+            const password = await new Promise((resolve) => {
+                readline.question("Enter the password: ", (answer) => {
+                    resolve(answer);
+                });
+            });
+            const costFactor = await getCostFactor();
+            const salt = generateSalt(costFactor);
+            const hashedPassword = hashPassword(password, salt);
+            console.log(`Salt: ${salt}`);
+            console.log(`Password hash: ${hashedPassword}`);
+
+        } else if (choice === '2') {
+            try {
+                const hashedPassword = await new Promise((resolve) => {
+                    readline.question("Enter the password hash: ", (answer) => {
+                        resolve(answer);
+                    });
+                });
+                const passwordToVerify = await new Promise((resolve) => {
+                    readline.question("Enter the password to verify: ", (answer) => {
+                        resolve(answer);
+                    });
+                });
+                const match = verifyPassword(hashedPassword, passwordToVerify);
+                console.log(`Does the password match the hash? ${match}`);
+            } catch (e) {
+                console.log(`Error verifying the password: ${e}`);
+            }
+
+        } else if (choice === '3') {
+            try {
+                const salt = await new Promise((resolve) => {
+                    readline.question("Enter the salt: ", (answer) => {
+                        resolve(answer);
+                    });
+                });
+                const hashedPassword = await new Promise((resolve) => {
+                    readline.question("Enter the password hash: ", (answer) => {
+                        resolve(answer);
+                    });
+                });
+                const filename = await new Promise((resolve) => {
+                    readline.question("Enter the filename to save the data: ", (answer) => {
+                        resolve(answer);
+                    });
+                });
+                saveToFile(salt, hashedPassword, filename);
+                console.log(`Data saved to ${filename}`);
+            } catch (e) {
+                console.log(`Error saving the data: ${e}`);
+            }
+
+        } else if (choice === '4') {
+            try {
+                const filename = await new Promise((resolve) => {
+                    readline.question("Enter the filename to load the data: ", (answer) => {
+                        resolve(answer);
+                    });
+                });
+                const { salt, hashedPassword } = loadFromFile(filename);
+                console.log(`Salt: ${salt}`);
+                console.log(`Password hash: ${hashedPassword}`);
+            } catch (e) {
+                console.log(`Error loading the data: ${e}`);
+            }
+
+        } else if (choice === '5') {
+            const costFactor = await getCostFactor();
+            while (true) {
+                const password = await new Promise((resolve) => {
+                    readline.question("Enter the password (or type 'quit' to stop): ", (answer) => {
+                        resolve(answer);
+                    });
+                });
+                if (password.toLowerCase() === 'quit') {
+                    break;
+                }
+                const salt = generateSalt(costFactor);
+                const hashedPassword = hashPassword(password, salt);
+                console.log(`Salt: ${salt}`);
+                console.log(`Password hash: ${hashedPassword}`);
+            }
+
+        } else if (choice === '6') {
+            console.log("Goodbye!");
+            readline.close();
+            break;
+
+        } else {
+            console.log("Invalid option. Please choose a valid option.");
+        }
+    }
+}
+
+main();
+