| private GetRfc3211WrapperName ( string oid ) : string | ||
| oid | string | |
| return | string | |
public RecipientInfo Generate(KeyParameter contentEncryptionKey, SecureRandom random)
{
byte[] keyBytes = contentEncryptionKey.GetKey();
string rfc3211WrapperName = Helper.GetRfc3211WrapperName(keyEncryptionKeyOID);
IWrapper keyWrapper = Helper.CreateWrapper(rfc3211WrapperName);
// Note: In Java build, the IV is automatically generated in JCE layer
int ivLength = rfc3211WrapperName.StartsWith("DESEDE") ? 8 : 16;
byte[] iv = new byte[ivLength];
random.NextBytes(iv);
ICipherParameters parameters = new ParametersWithIV(keyEncryptionKey, iv);
keyWrapper.Init(true, new ParametersWithRandom(parameters, random));
Asn1OctetString encryptedKey = new DerOctetString(
keyWrapper.Wrap(keyBytes, 0, keyBytes.Length));
DerSequence seq = new DerSequence(
new DerObjectIdentifier(keyEncryptionKeyOID),
new DerOctetString(iv));
AlgorithmIdentifier keyEncryptionAlgorithm = new AlgorithmIdentifier(
PkcsObjectIdentifiers.IdAlgPwriKek, seq);
return(new RecipientInfo(new PasswordRecipientInfo(
keyDerivationAlgorithm, keyEncryptionAlgorithm, encryptedKey)));
}
public RecipientInfo Generate(KeyParameter contentEncryptionKey, SecureRandom random)
{
byte[] key = contentEncryptionKey.GetKey();
string rfc3211WrapperName = Helper.GetRfc3211WrapperName(keyEncryptionKeyOID);
IWrapper wrapper = Helper.CreateWrapper(rfc3211WrapperName);
int num = (Platform.StartsWith(rfc3211WrapperName, "DESEDE") ? 8 : 16);
byte[] array = new byte[num];
((Random)random).NextBytes(array);
ICipherParameters parameters = new ParametersWithIV(keyEncryptionKey, array);
wrapper.Init(forWrapping: true, new ParametersWithRandom(parameters, random));
Asn1OctetString encryptedKey = new DerOctetString(wrapper.Wrap(key, 0, key.Length));
DerSequence parameters2 = new DerSequence(new DerObjectIdentifier(keyEncryptionKeyOID), new DerOctetString(array));
AlgorithmIdentifier keyEncryptionAlgorithm = new AlgorithmIdentifier(PkcsObjectIdentifiers.IdAlgPwriKek, parameters2);
return(new RecipientInfo(new PasswordRecipientInfo(keyDerivationAlgorithm, keyEncryptionAlgorithm, encryptedKey)));
}