diff --git a/homework/password-check/validation.cpp b/homework/password-check/validation.cpp
index a2f12ff3..e5827130 100644
--- a/homework/password-check/validation.cpp
+++ b/homework/password-check/validation.cpp
@@ -1,2 +1,68 @@
 #include "validation.hpp"
-// TODO: Put implementations here
\ No newline at end of file
+#include <algorithm>
+#include <cctype>
+
+std::string getErrorMessage(ErrorCode code) {
+    switch (code) {
+    case ErrorCode::Ok:
+        return {
+            "Ok"};
+        break;
+    case ErrorCode::PasswordNeedsAtLeastNineCharacters:
+        return {
+            "Password needs to have at least nine characters"};
+        break;
+    case ErrorCode::PasswordNeedsAtLeastOneNumber:
+        return {
+            "Password needs to have at least one number"};
+        break;
+    case ErrorCode::PasswordNeedsAtLeastOneSpecialCharacter:
+        return {
+            "Password needs to have at least one special character"};
+        break;
+    case ErrorCode::PasswordNeedsAtLeastOneUppercaseLetter:
+        return {
+            "Password needs to have at least one uppercase letter"};
+        break;
+    case ErrorCode::PasswordsDoNotMatch:
+        return {
+            "Passwords do not match"};
+        break;
+    default:
+        return {
+            "Invalid error code"};
+        break;
+    }
+}
+
+bool doPasswordsMatch(const std::string& pass1, const std::string& pass2) {
+    return (pass1 == pass2);
+}
+
+ErrorCode checkPasswordRules(const std::string& pass) {
+    if (pass.size() < 9u) {
+        return ErrorCode::PasswordNeedsAtLeastNineCharacters;
+    }
+
+    if (std::none_of(pass.begin(), pass.end(), [](unsigned char c) { return std::isdigit(c); })) {
+        return ErrorCode::PasswordNeedsAtLeastOneNumber;
+    }
+
+    if (std::none_of(pass.begin(), pass.end(), [](unsigned char c) { return !std::isalnum(c); })) {
+        return ErrorCode::PasswordNeedsAtLeastOneSpecialCharacter;
+    }
+
+    if (std::none_of(pass.begin(), pass.end(), [](unsigned char c) { return std::isupper(c); })) {
+        return ErrorCode::PasswordNeedsAtLeastOneUppercaseLetter;
+    }
+
+    return ErrorCode::Ok;
+}
+
+ErrorCode checkPassword(const std::string& pass1, const std::string& pass2) {
+    if (doPasswordsMatch(pass1, pass2)) {
+        return checkPasswordRules(pass1);
+    }
+
+    return ErrorCode::PasswordsDoNotMatch;
+}
diff --git a/homework/password-check/validation.hpp b/homework/password-check/validation.hpp
index 85160868..171b965d 100644
--- a/homework/password-check/validation.hpp
+++ b/homework/password-check/validation.hpp
@@ -1,2 +1,21 @@
-// TODO: I'm empty :) Put enum and function headers here.
-// Don't forget the header guard - #pragma once
\ No newline at end of file
+#ifndef VALIDATION_H
+#define VALIDATION_H
+
+#include <string>
+
+enum class ErrorCode {
+    Ok,
+    PasswordNeedsAtLeastNineCharacters,
+    PasswordNeedsAtLeastOneNumber,
+    PasswordNeedsAtLeastOneSpecialCharacter,
+    PasswordNeedsAtLeastOneUppercaseLetter,
+    PasswordsDoNotMatch
+};
+
+std::string getErrorMessage(ErrorCode code);
+bool doPasswordsMatch(const std::string& pass1, const std::string& pass2);
+ErrorCode checkPasswordRules(const std::string& pass);
+
+ErrorCode checkPassword(const std::string& pass1, const std::string& pass2);
+
+#endif