diff --git a/src/services/authService.js b/src/services/authService.js
index dc5bb90..cc7efd1 100644
--- a/src/services/authService.js
+++ b/src/services/authService.js
@@ -3,7 +3,7 @@ const jwt = require("jsonwebtoken");
 const userModel = require("../models/user");
 const AppError = require("../utils/appError");
 const configManager = require("../utils/configManager");
-const validate = require("../utils/validate");
+const validate = require("../utils/validate_legacy");
 
 const JWT_Secret = configManager.getJWTSecret();
 
diff --git a/src/services/modService.js b/src/services/modService.js
index b1611d5..739b217 100644
--- a/src/services/modService.js
+++ b/src/services/modService.js
@@ -1,6 +1,6 @@
 const model = require("../models/mod");
 const AppError = require("../utils/appError");
-const { validateModData } = require("../utils/validate");
+const { validateModData } = require("../utils/validate_legacy");
 const { mdToHtml } = require("../utils/convert");
 const { sanitizeModData } = require("../utils/sanitize");
 
diff --git a/src/services/userService.js b/src/services/userService.js
index a8eea3c..1eb2ca5 100644
--- a/src/services/userService.js
+++ b/src/services/userService.js
@@ -1,6 +1,6 @@
 const model = require("../models/user");
 const AppError = require("../utils/appError");
-const { validateUserData } = require("../utils/validate");
+const { validateUserData } = require("../utils/validate_legacy");
 const { sanitizeUserData } = require("../utils/sanitize");
 
 async function getAllUsers() {
diff --git a/src/utils/crypto.js b/src/utils/crypto.js
new file mode 100644
index 0000000..be1ffc5
--- /dev/null
+++ b/src/utils/crypto.js
@@ -0,0 +1,61 @@
+// --- Imports ---
+const jwt = require("jsonwebtoken");
+const bcrypt = require("bcrypt");
+const { getConfig, getJWTSecret } = require("./configManager");
+
+
+// --- Config ---
+
+// Declarations
+let JWT_Secret;
+let token_expiry;
+// Constant values
+const saltRounds = 12;
+// Load
+(async () => {
+    const config = await getConfig();
+    JWT_Secret = await getJWTSecret();
+    token_expiry = config.auth.tokenExpiry;
+    signature_algorithm = config.auth.signatureAlgorithm;
+})();
+ 
+
+// --- Functions ---
+
+async function hashPassword(passwd) {
+    const hash = bcrypt.hashSync(passwd, saltRounds);
+    return hash;
+}
+
+
+async function passwordsMatch(password, hashed_password) {
+        return await bcrypt.compare(password, hashed_password);
+}
+
+
+async function signToken(payload, options = null) {
+    if (options == null) {
+        return jwt.sign(payload, JWT_Secret, { expiresIn: token_expiry, });
+    }
+    else {
+        return jwt.sign(payload, JWT_Secret, options);
+    }
+
+}
+
+
+function verifyToken(token) {
+    return new Promise( async (resolve, reject) => {
+        await jwt.verify( token, JWT_Secret, (err, user) => {
+            if (err) {
+                reject(err);
+            } else {
+                resolve(user);
+            }
+        });
+    });
+}
+
+
+// --- Exports ---
+module.exports = { passwordsMatch, hashPassword, verifyToken, signToken };
\ No newline at end of file
diff --git a/src/utils/validate.js b/src/utils/validate.js
index 63c605b..b7c3519 100644
--- a/src/utils/validate.js
+++ b/src/utils/validate.js
@@ -1,82 +1,32 @@
-const mod_model = require("../models/mod");
-const user_model = require("../models/user");
+// --- Imports ---
 const AppError = require("./appError");
 
-async function validateModData(mod_data) {
-    //TODO WIP
-    // Check fields existence
-    const not_null = mod_data &&
-                Object.keys(mod_data).length == 5 &&
-                mod_data.name &&
-                mod_data.displayName &&
-                mod_data.author &&
-                mod_data.versions != null;
-                
-                // mod_data.otherInfos != null &&
-                // Object.keys(mod_data.otherInfos).length == 0 &&
-                // mod_data.otherInfos.description != null &&
-                // mod_data.otherInfos.links != null &&
-                // mod_data.otherInfos.tags != null &&
-                // mod_data.otherInfos.screenshots != null &&
-                // mod_data.otherInfos.license != null &&
-                // mod_data.otherInfos.changelogs != null;
 
-    if (!not_null) {
-        console.debug("Item is missing expected fields:", mod_data);
-        throw new AppError(400, "Bad request", "Missing expected fields");
-    }
+// --- Functions ---
 
-    // Check fields format (check if sanitized)
-    const is_valid_name = /^[a-zA-Z0-9_]+$/.test(mod_data.name);
-    const is_valid_displayName = true;
-    // const is_valid_displayName = /^[a-zA-Z0-9_]+$/.test(mod_data.name); // Temporary
-    // const 
-    
-    const is_valid = is_valid_name && is_valid_displayName;
-    if (!is_valid) {
-        console.debug("Fields are not following the expected formats");
-        throw new AppError(400, "Bad request", "The provided fields don't match the expected format");
-    }
+async function validateNewModData(mod_data) {
+
+    throw new AppError(501, "Not implemented");
+    //TODO
+    // try {
+    //     node_schemas.validateNewModData(node_data);
+    // } catch (err) {
+    //     throw new AppError(400, "Missing or invalid fields", "Bad request", err);
+    // }
 
-    // Check if mod already exists
-    const exists = await mod_model.exists(mod_data.name);
-    if (exists) {
-        console.debug("Error: Item already exists");
-        throw new AppError(403, "Forbidden", "Content with this name already exists");
-    }
 }
 
 
-async function validateUserData(user_data) {
+async function validateNewUserData(user_data) {
+    
     throw new AppError(501, "Not implemented");
-    
     //TODO
+    // try {
+    //     node_schemas.validateNewUserData(node_data);
+    // } catch (err) {
+    //     throw new AppError(400, "Missing or invalid fields", "Bad request", err);
+    // }
 
-    // Check fields existence
-    // ...
-
-    if (!not_null) {
-        console.debug("Missing expected fields:", mod_data);
-        throw new AppError(400, "Bad request: Missing expected fields");
-    }
-
-    // Check fields format (check if sanitized)
-    const is_valid_username = /^[a-zA-Z0-9_]+$/.test(user_data.username);
-    // const is_valid_email = ...
-    // ...
-    
-    const is_valid = is_valid_username && is_valid_email;
-    if (!is_valid) {
-        console.debug("Fields are not following the expected formats");
-        throw new AppError(400, "Bad request: The provided fields don't match the expected format");
-    }
-
-    // Check if user already exists
-    const exists = await user_model.exists(user_data.username);
-    if (exists) {
-        console.debug("Error: User already exists");
-        throw new AppError(403, "Forbidden: User with this name already exists");
-    }
 }
 
 async function validateCretendials(identifier, password) {
@@ -84,6 +34,9 @@ async function validateCretendials(identifier, password) {
     throw new AppError(501, "Not implemented");
 }
 
+
+// --- Utils ---
+
 async function isEmail(text) {
     const email_regex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
     return email_regex.test(text);
@@ -95,4 +48,4 @@ async function isID(text) {
 }
 
 
-module.exports = { validateModData, validateUserData, isEmail, isID };
\ No newline at end of file
+module.exports = { validateNewModData, validateNewUserData, isEmail, isID };
\ No newline at end of file
diff --git a/src/utils/validate_legacy.js b/src/utils/validate_legacy.js
new file mode 100644
index 0000000..63c605b
--- /dev/null
+++ b/src/utils/validate_legacy.js
@@ -0,0 +1,98 @@
+const mod_model = require("../models/mod");
+const user_model = require("../models/user");
+const AppError = require("./appError");
+
+async function validateModData(mod_data) {
+    //TODO WIP
+    // Check fields existence
+    const not_null = mod_data &&
+                Object.keys(mod_data).length == 5 &&
+                mod_data.name &&
+                mod_data.displayName &&
+                mod_data.author &&
+                mod_data.versions != null;
+                
+                // mod_data.otherInfos != null &&
+                // Object.keys(mod_data.otherInfos).length == 0 &&
+                // mod_data.otherInfos.description != null &&
+                // mod_data.otherInfos.links != null &&
+                // mod_data.otherInfos.tags != null &&
+                // mod_data.otherInfos.screenshots != null &&
+                // mod_data.otherInfos.license != null &&
+                // mod_data.otherInfos.changelogs != null;
+
+    if (!not_null) {
+        console.debug("Item is missing expected fields:", mod_data);
+        throw new AppError(400, "Bad request", "Missing expected fields");
+    }
+
+    // Check fields format (check if sanitized)
+    const is_valid_name = /^[a-zA-Z0-9_]+$/.test(mod_data.name);
+    const is_valid_displayName = true;
+    // const is_valid_displayName = /^[a-zA-Z0-9_]+$/.test(mod_data.name); // Temporary
+    // const 
+    
+    const is_valid = is_valid_name && is_valid_displayName;
+    if (!is_valid) {
+        console.debug("Fields are not following the expected formats");
+        throw new AppError(400, "Bad request", "The provided fields don't match the expected format");
+    }
+
+    // Check if mod already exists
+    const exists = await mod_model.exists(mod_data.name);
+    if (exists) {
+        console.debug("Error: Item already exists");
+        throw new AppError(403, "Forbidden", "Content with this name already exists");
+    }
+}
+
+
+async function validateUserData(user_data) {
+    throw new AppError(501, "Not implemented");
+    
+    //TODO
+
+    // Check fields existence
+    // ...
+
+    if (!not_null) {
+        console.debug("Missing expected fields:", mod_data);
+        throw new AppError(400, "Bad request: Missing expected fields");
+    }
+
+    // Check fields format (check if sanitized)
+    const is_valid_username = /^[a-zA-Z0-9_]+$/.test(user_data.username);
+    // const is_valid_email = ...
+    // ...
+    
+    const is_valid = is_valid_username && is_valid_email;
+    if (!is_valid) {
+        console.debug("Fields are not following the expected formats");
+        throw new AppError(400, "Bad request: The provided fields don't match the expected format");
+    }
+
+    // Check if user already exists
+    const exists = await user_model.exists(user_data.username);
+    if (exists) {
+        console.debug("Error: User already exists");
+        throw new AppError(403, "Forbidden: User with this name already exists");
+    }
+}
+
+async function validateCretendials(identifier, password) {
+    
+    throw new AppError(501, "Not implemented");
+}
+
+async function isEmail(text) {
+    const email_regex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
+    return email_regex.test(text);
+}
+
+async function isID(text) {
+    const id_regex = /[a-zA-Z0-9_]+/;
+    return id_regex.test(text);
+}
+
+
+module.exports = { validateModData, validateUserData, isEmail, isID };
\ No newline at end of file