protected byte[] HashPassword(EncryptionInfo info, string password)
{
HashAlgorithm sha1 = HashAlgorithm.Create("SHA1");
byte[] bytes;
try
{
bytes = Encoding.Unicode.GetBytes(password); //bytes = password.getBytes("UTF-16LE");
}
catch (CryptographicUnexpectedOperationException)
{
throw new EncryptedDocumentException("UTF16 not supported");
}
//sha1.ComputeHash(info.GetVerifier().Salt);
byte[] salt = info.Verifier.Salt;
byte[] temp = new byte[salt.Length + bytes.Length];
Array.Copy(salt, temp, salt.Length);
Array.Copy(bytes, 0, temp, salt.Length, bytes.Length);
byte[] hash = sha1.ComputeHash(temp);
byte[] iterator = new byte[4];
temp = new byte[24];
for (int i = 0; i < info.Verifier.SpinCount; i++)
{
//sha1.Clear();
LittleEndian.PutInt(iterator, i);
//sha1.iterator; //sha1.update(iterator);
Array.Copy(iterator, temp, iterator.Length);
Array.Copy(hash, 0, temp, iterator.Length, hash.Length);
hash = sha1.ComputeHash(temp);
}
return hash;
}
public static Decryptor GetInstance(EncryptionInfo info)
{
int major = info.VersionMajor;
int minor = info.VersionMinor;
if (major == 4 && minor == 4)
return new AgileDecryptor(info);
else if (minor == 2 && (major == 3 || major == 4))
return new EcmaDecryptor(info);
else
throw new EncryptedDocumentException("Unsupported version");
}
public EcmaDecryptor(EncryptionInfo info)
{
this.info = info;
}
public AgileDecryptor(EncryptionInfo info)
{
_info = info;
}
