PGPEncryptedDataList enc = getEcryptedDataList(pgpFactory, firstObject);
if (enc == null) {
throw getFormatException();
}
PGPPublicKeyEncryptedData pbe = null;
PGPPrivateKey key = null;
// find encrypted data for which a private key exists in the secret key ring
for (int i = 0; i < enc.size() && key == null; i++) {
Object encryptedData = enc.get(i);
if (!(encryptedData instanceof PGPPublicKeyEncryptedData)) {
throw getFormatException();
}
pbe = (PGPPublicKeyEncryptedData) encryptedData;
key = secretKeyAccessor.getPrivateKey(exchange, pbe.getKeyID());
if (key != null) {
// take the first key
break;
}
}
if (key == null) {
throw new PGPException("PGP message is encrypted with a key which could not be found in the Secret Keyring.");
}
InputStream encData = pbe.getDataStream(new JcePublicKeyDataDecryptorFactoryBuilder().setProvider(getProvider()).build(key));
return encData;
}