public override void ConfirmPassword(String password, byte[] keySpec,
byte[] keySalt, byte[] verifier, byte[] verifierSalt,
byte[] integritySalt)
{
Debug.Assert(verifier != null && verifierSalt != null);
CryptoAPIEncryptionVerifier ver = builder.GetVerifier();
ver.SetSalt(verifierSalt);
ISecretKey skey = CryptoAPIDecryptor.GenerateSecretKey(password, ver);
SetSecretKey(skey);
try
{
Cipher cipher = InitCipherForBlock(null, 0);
byte[] encryptedVerifier = new byte[verifier.Length];
cipher.Update(verifier, 0, verifier.Length, encryptedVerifier);
ver.SetEncryptedVerifier(encryptedVerifier);
HashAlgorithm hashAlgo = ver.HashAlgorithm;
MessageDigest hashAlg = CryptoFunctions.GetMessageDigest(hashAlgo);
byte[] calcVerifierHash = hashAlg.Digest(verifier);
byte[] encryptedVerifierHash = cipher.DoFinal(calcVerifierHash);
ver.SetEncryptedVerifierHash(encryptedVerifierHash);
}
catch (Exception e)
{
throw new EncryptedDocumentException("Password Confirmation failed", e);
}
}
/**
* Initialize the builder from a stream
*/
public void Initialize(EncryptionInfo info, ILittleEndianInput dis)
{
this.info = info;
int hSize = dis.ReadInt();
header = new CryptoAPIEncryptionHeader(dis);
verifier = new CryptoAPIEncryptionVerifier(dis, header);
decryptor = new CryptoAPIDecryptor(this);
encryptor = new CryptoAPIEncryptor(this);
}
/**
* Initialize the builder from scratch
*/
public void Initialize(EncryptionInfo info,
CipherAlgorithm cipherAlgorithm, HashAlgorithm hashAlgorithm,
int keyBits, int blockSize, ChainingMode chainingMode)
{
this.info = info;
if (cipherAlgorithm == null)
{
cipherAlgorithm = CipherAlgorithm.rc4;
}
if (hashAlgorithm == null)
{
hashAlgorithm = HashAlgorithm.sha1;
}
if (keyBits == -1)
{
keyBits = 0x28;
}
Debug.Assert(cipherAlgorithm == CipherAlgorithm.rc4 && hashAlgorithm == HashAlgorithm.sha1);
header = new CryptoAPIEncryptionHeader(cipherAlgorithm, hashAlgorithm, keyBits, blockSize, chainingMode);
verifier = new CryptoAPIEncryptionVerifier(cipherAlgorithm, hashAlgorithm, keyBits, blockSize, chainingMode);
decryptor = new CryptoAPIDecryptor(this);
encryptor = new CryptoAPIEncryptor(this);
}
/**
* Initializes a cipher object for a given block index for encryption
*
* @param cipher may be null, otherwise the given instance is reset to the new block index
* @param block the block index, e.g. the persist/slide id (hslf)
* @return a new cipher object, if cipher was null, otherwise the reInitialized cipher
* @throws GeneralSecurityException
*/
public Cipher InitCipherForBlock(Cipher cipher, int block)
{
return(CryptoAPIDecryptor.InitCipherForBlock(cipher, block, builder, GetSecretKey(), Cipher.ENCRYPT_MODE));
}
