Add test_encrypt and test_hash php files to the app just for completion.

passman-dev/php/passman/test_encrypt.php

@@ -0,0 +1,84 @@
+<?php
+// Simple example of encrypting/decrypting data using a password
+
+function getPasswordHash_Bin($username, $password) {
+    $salt = hash('sha256', $username, true);	// Compute salt as the hash of the username (parameter 'true' computes hash in bin format, default is hex)
+    $saltedPwd = $salt . $password;				// Get a salted password by combining salt and password
+    $hashedPwd = hash('sha256', $saltedPwd, true);	// Hash the salted password using SHA-256
+    // Return the password hash and the salt
+    return [
+        'hash' => $hashedPwd,
+        'salt' => $salt
+    ];
+}
+
+function deriveEncryptionKey($username, $password) {
+    // Compute binary hash of salted-password (and salt) from username and password
+    $pwdHash = getPasswordHash_Bin($username, $password);
+
+    // Derive a secure key using PBKDF2
+    $iterations = 100000; // Number of iterations for PBKDF2
+    $keyLength = 32; // Key length = 32 bytes for AES-256
+    $key = hash_pbkdf2('sha256', $pwdHash['hash'], $pwdHash['salt'], $iterations, $keyLength, true); // Parameter 'true' computes hash_pbkdf2 in bin
+    return $key;
+}
+
+// Encrypt data using AES-256-GCM
+function encryptData($data, $key) {
+    $nonce = random_bytes(12); // 12 bytes for AES-GCM nonce
+    $cipher = "aes-256-gcm";
+
+    // Encrypt the data
+    $ciphertext = openssl_encrypt($data, $cipher, $key, OPENSSL_RAW_DATA, $nonce, $tag);
+
+    //echo "nonce: " . bin2hex($nonce) . "<br>";;
+    //echo "tag: " . bin2hex($tag) . "<br>";;
+
+    // Concatenate nonce, tag, and ciphertext for storage
+    $result = $nonce . $tag . $ciphertext;
+    return base64_encode($result); // Encode to make it suitable for storage or transmission
+}
+
+// Decrypt data using AES-256-GCM, extracting nonce, tag, and ciphertext from the concatenated string
+function decryptData($encryptedData, $key) {
+    $cipher = "aes-256-gcm";
+
+    // Decode the base64-encoded data
+    $encryptedData = base64_decode($encryptedData);
+
+    // Extract nonce (12 bytes), tag (16 bytes), and ciphertext
+    $nonce = substr($encryptedData, 0, 12);
+    $tag = substr($encryptedData, 12, 16);
+    $ciphertext = substr($encryptedData, 28);
+
+    // Decrypt the data
+    $decryptedData = openssl_decrypt($ciphertext, $cipher, $key, OPENSSL_RAW_DATA, $nonce, $tag);
+
+    return $decryptedData;
+}
+
+
+// Example Usage
+$username = "user123";
+$password = "securepassword";
+$dataToEncrypt = "Sensitive Data";
+
+// Derive a symmetric encryption/dec key by hashing the password (and username as the salt) using PBKDF2 algorithm
+$encryptionKey = deriveEncryptionKey($username, $password);
+
+// Encrypt the data
+$encrypted = encryptData($dataToEncrypt, $encryptionKey);
+
+// Decrypt the data
+$decrypted = decryptData($encrypted, $encryptionKey);
+
+// Display results
+echo "Original Data: $dataToEncrypt<br>";
+//echo "Encryption Key (in bin): " . $encryptionKey . "<br>";
+//echo "Encryption Key (in hex): " . bin2hex($encryptionKey) . "<br>";
+echo "Encrypted Data (in base64): " . $encrypted . "<br>";
+//echo "Encrypted Data (in bin): " . base64_decode($encrypted) . "<br>";
+//echo "Encrypted Data (in hex): " . bin2hex(base64_decode($encrypted)) . "<br>";
+echo "Decrypted Data: $decrypted<br>";
+
+?>

passman-dev/php/passman/test_hash.php

@@ -0,0 +1,46 @@
+<?php
+// Simple example of hashing password
+
+$username = "user123";
+$password = "securepassword";
+
+// Compute salt as the hash of the username
+$salt = hash('sha256', $username);
+
+// Get a salted password by combining salt and password
+$saltedPwd = $salt . $password;
+
+// Hash the salted password using SHA-256
+$hashedPwd = hash('sha256', $saltedPwd);
+
+// Display variables
+echo "Username: $username<br>";
+echo "Password: $password<br>";
+
+echo "Salt (computed as the username's hash): $salt<br>";
+echo "Salted password: $saltedPwd<br>";
+echo "Hash of salted password: $hashedPwd<br>";
+echo "<p>";
+
+
+// Same as above but using a function
+
+function getPasswordHash_Hex($username, $password) {
+    // Compute hash of salted-password (and salt) from username and password (in hex format)
+    $salt = hash('sha256', $username);	// Compute salt as the hash of the username
+    $saltedPwd = $salt . $password;		// Get a salted password by combining salt and password
+    $hashedPwd = hash('sha256', $saltedPwd);	// Hash the salted password using SHA-256
+    // Return the password hash and the salt
+    return [
+        'hash' => $hashedPwd,
+        'salt' => $salt
+    ];
+}
+
+// Example usage of function getPasswordHash
+$getHasedPwd = getPasswordHash_Hex($username, $password);
+// Display results
+echo "Salt (in hex) computed using function getPasswordHash_Hex: " . $getHasedPwd['salt'] . "<br>";
+echo "Hash (in hex) computed using function getPasswordHash_Hex: " . $getHasedPwd['hash'] . "<br>";
+
+?>