public async Task Init(byte[] recipientId, byte[] privateKey)
{
const int contentInfoHeaderSize = 16;
var contentInfoHeader = new byte[contentInfoHeaderSize];
await this.sourceStream.ReadAsync(contentInfoHeader, 0, contentInfoHeaderSize);
int infoSize = (int)VirgilCipherBase.DefineContentInfoSize(contentInfoHeader);
if (infoSize == 0 || infoSize < contentInfoHeaderSize)
{
throw new VirgilException("Encrypted file does not contain embedded content info.");
}
var contentInfo = new byte[infoSize];
await this.sourceStream.ReadAsync(contentInfo, contentInfoHeaderSize, infoSize - contentInfoHeaderSize);
Array.Copy(contentInfoHeader, contentInfo, contentInfoHeaderSize);
this.virgilCipher.SetContentInfo(contentInfo);
this.chunkSize = (int)this.virgilCipher.StartDecryptionWithKey(recipientId, privateKey);
this.buffer = new byte[this.chunkSize];
this.hashOrigianl.Start();
this.hashEncrypted.Start();
}
public async Task Init(byte[] recipientId, byte[] privateKey, string password)
{
this.recipientId = recipientId;
this.privateKey = privateKey;
this.password = password;
const int contentInfoHeaderSize = 16;
var contentInfoHeader = new byte[contentInfoHeaderSize];
await this.sourceStream.ReadAsync(contentInfoHeader, 0, contentInfoHeaderSize);
int infoSize = (int)VirgilCipherBase.DefineContentInfoSize(contentInfoHeader);
if (infoSize == 0 || infoSize < contentInfoHeaderSize)
{
throw new VirgilException("Encrypted file does not contain embedded content info.");
}
var contentInfo = new byte[infoSize];
await this.sourceStream.ReadAsync(contentInfo, contentInfoHeaderSize, infoSize - contentInfoHeaderSize);
Array.Copy(contentInfoHeader, contentInfo, contentInfoHeaderSize);
this.virgilCipher.SetContentInfo(contentInfo);
if (!string.IsNullOrEmpty(password))
{
this.chunkSize = (int)this.virgilCipher.StartDecryptionWithKey(
recipientId, privateKey,
Encoding.UTF8.GetBytes(password));
}
else
{
this.chunkSize = (int)this.virgilCipher.StartDecryptionWithKey(recipientId, privateKey);
}
this.buffer = new byte[this.chunkSize];
}
public byte[] Decrypt(byte[] cipherData, string privateKeyPassword = null)
{
using (var cipher = new VirgilCipher())
{
var contentInfoSize = VirgilCipherBase.DefineContentInfoSize(cipherData);
if (contentInfoSize == 0)
{
throw new ArgumentException("Content info header is missing or corrupted", nameof(cipherData));
}
byte[] result;
if (privateKeyPassword != null)
{
result = cipher.DecryptWithKey(cipherData, this.GetRecepientId(), this.PrivateKey.Data,
privateKeyPassword.GetBytes());
}
else
{
result = cipher.DecryptWithKey(cipherData, this.GetRecepientId(), this.PrivateKey.Data);
}
return(result);
}
}
