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35 lines
995 B
35 lines
995 B
import 'package:encrypt/encrypt.dart' as encrypt;
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const ivEncodedStringLength = 12;
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String generateKey() {
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final key = encrypt.Key.fromSecureRandom(512);
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final iv = encrypt.IV.fromSecureRandom(8);
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return key.base64 + iv.base64;
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}
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List<String> extractKeys(String key) {
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final _key = key.substring(0, key.length - ivEncodedStringLength);
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final iv = key.substring(key.length - ivEncodedStringLength);
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return [_key, iv];
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}
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Future<String> encode({encrypt.Key key, encrypt.IV iv, String data}) async {
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final encrypter = encrypt.Encrypter(encrypt.Salsa20(key));
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final encrypted = encrypter.encrypt(data, iv: iv);
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return encrypted.base64;
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}
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Future<String> decode({String password, String data}) async {
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final keys = extractKeys(password);
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final key = encrypt.Key.fromBase64(keys.first);
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final iv = encrypt.IV.fromBase64(keys.last);
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final encrypter = encrypt.Encrypter(encrypt.Salsa20(key));
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final encrypted = encrypter.decrypt64(data, iv: iv);
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return encrypted;
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}
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