47 lines
1.3 KiB
PHP
47 lines
1.3 KiB
PHP
<!doctype html>
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<html>
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<head></head>
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<body>
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<?php
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require_once ('tokenkonfiguration.php');
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if(isset($_GET['token']) ) {
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// E-Mail-Adresse des Nutzers
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$encrypted_data = $_GET['token'];
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$encrypted_iv = $_GET['iv'];
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echo "token: $encrypted_data<br> \n";
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echo "iv: $encrypted_iv<br> \n";
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// Erstellen eines Cipher-Objekts für die Verschlüsselung
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$cipher_method = "AES-256-CBC";
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$iv_length = openssl_cipher_iv_length($cipher_method);
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$iv = base64_decode($encrypted_iv);
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$cipher_options = OPENSSL_RAW_DATA;
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$cipher_key = openssl_digest($secret_key, 'SHA256', true);
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// Entschlüsseln des verschlüsselten Textes
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$decoded_cipher_text = base64_decode($encrypted_data);
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$iv = base64_decode($encrypted_iv);
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$iv = substr($decoded_cipher_text, 0, $iv_length);
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$cipher_text = substr($decoded_cipher_text, $iv_length);
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$decrypted_email = openssl_decrypt($cipher_text, $cipher_method, $cipher_key, $cipher_options, $iv);
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// Verifikationsstring überprüfen und entfernen
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$verification_length = strlen($secret_verification);
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if(substr($decrypted_email, -$verification_length) == $secret_verification) {
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$decrypted_email = substr($decrypted_email, 0, -$verification_length);
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}
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// Ausgabe der entschlüsselten E-Mail-Adresse
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echo "E-Mail-Adresse: ", $decrypted_email, "<br>\n";
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} else {
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echo "Kein gültiges Token!<br>";
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}
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?>
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</body></html>
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