decrypt method
Decrypts this entry using the given password.
Implementation
@override
void decrypt(String password) {
if (isDecrypted()) return;
// TODO: Implement JKS/JCEKS private key decryption
// This requires:
// 1. Parse the EncryptedPrivateKeyInfo ASN.1 structure
// 2. Determine the encryption algorithm (JKS proprietary or JCEKS PBE)
// 3. Decrypt using the appropriate algorithm
// 4. Parse the resulting PKCS#8 PrivateKeyInfo
throw UnimplementedError('Private key decryption not yet implemented');
}