internal StandardEncryptionHeader(ILittleEndianInput is1)
{
Flags = (is1.ReadInt());
SizeExtra = (is1.ReadInt());
CipherAlgorithm = (CipherAlgorithm.FromEcmaId(is1.ReadInt()));
HashAlgorithm = (HashAlgorithm.FromEcmaId(is1.ReadInt()));
int keySize = is1.ReadInt();
if (keySize == 0)
{
// for the sake of inheritance of the cryptoAPI classes
// see 2.3.5.1 RC4 CryptoAPI Encryption Header
// If Set to 0x00000000, it MUST be interpreted as 0x00000028 bits.
keySize = 0x28;
}
KeySize = (keySize);
BlockSize = (keySize);
CipherProvider = (CipherProvider.FromEcmaId(is1.ReadInt()));
is1.ReadLong(); // skip reserved
// CSPName may not always be specified
// In some cases, the salt value of the EncryptionVerifier is the next chunk of data
((ByteArrayInputStream)is1).Mark(LittleEndianConsts.INT_SIZE + 1);
int CheckForSalt = is1.ReadInt();
((ByteArrayInputStream)is1).Reset();
if (CheckForSalt == 16)
{
CspName = ("");
}
else
{
StringBuilder builder = new StringBuilder();
while (true)
{
char c = (char)is1.ReadShort();
if (c == 0)
{
break;
}
builder.Append(c);
}
CspName = (builder.ToString());
}
ChainingMode = (ChainingMode.ecb);
KeySalt = (null);
}
public void Test()
{
Assert.AreEqual(128, CipherAlgorithm.aes128.defaultKeySize);
foreach (CipherAlgorithm alg in CipherAlgorithm.Values)
{
Assert.AreEqual(alg, CipherAlgorithm.ValueOf(alg.ToString()));
}
Assert.AreEqual(CipherAlgorithm.aes128, CipherAlgorithm.FromEcmaId(0x660E));
Assert.AreEqual(CipherAlgorithm.aes192, CipherAlgorithm.FromXmlId("AES", 192));
try
{
CipherAlgorithm.FromEcmaId(0);
Assert.Fail("Should throw exception");
}
catch (EncryptedDocumentException)
{
// expected
}
try
{
CipherAlgorithm.FromXmlId("AES", 1);
Assert.Fail("Should throw exception");
}
catch (EncryptedDocumentException)
{
// expected
}
try
{
CipherAlgorithm.FromXmlId("RC1", 0x40);
Assert.Fail("Should throw exception");
}
catch (EncryptedDocumentException)
{
// expected
}
}