public class CryptoAPIDecryptor extends Decryptor
builder, DEFAULT_PASSWORD, DEFAULT_POIFS_ENTRY
Modifier | Constructor and Description |
---|---|
protected |
CryptoAPIDecryptor(CryptoAPIEncryptionInfoBuilder builder) |
Modifier and Type | Method and Description |
---|---|
protected static javax.crypto.SecretKey |
generateSecretKey(java.lang.String password,
EncryptionVerifier ver) |
java.io.InputStream |
getDataStream(DirectoryNode dir)
Decrypt the Document-/SummaryInformation and other optionally streams.
|
long |
getLength()
Returns the length of the encrypted data that can be safely read with
Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode) . |
javax.crypto.Cipher |
initCipherForBlock(javax.crypto.Cipher cipher,
int block)
Initializes a cipher object for a given block index for decryption
|
protected static javax.crypto.Cipher |
initCipherForBlock(javax.crypto.Cipher cipher,
int block,
EncryptionInfoBuilder builder,
javax.crypto.SecretKey skey,
int encryptMode) |
boolean |
verifyPassword(java.lang.String password) |
getBlockSizeInBytes, getDataStream, getDataStream, getDataStream, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getKeySizeInBytes, getSecretKey, getVerifier, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier
protected CryptoAPIDecryptor(CryptoAPIEncryptionInfoBuilder builder)
public boolean verifyPassword(java.lang.String password)
verifyPassword
in class Decryptor
public javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher, int block) throws java.security.GeneralSecurityException
cipher
- may be null, otherwise the given instance is reset to the new block indexblock
- the block index, e.g. the persist/slide id (hslf)java.security.GeneralSecurityException
protected static javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher, int block, EncryptionInfoBuilder builder, javax.crypto.SecretKey skey, int encryptMode) throws java.security.GeneralSecurityException
java.security.GeneralSecurityException
protected static javax.crypto.SecretKey generateSecretKey(java.lang.String password, EncryptionVerifier ver)
public java.io.InputStream getDataStream(DirectoryNode dir) throws java.io.IOException, java.security.GeneralSecurityException
getDataStream
in class Decryptor
dir
- the node to read fromjava.io.IOException
java.security.GeneralSecurityException
public long getLength()
Decryptor
Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)
.
Just reading to the end of the input stream is not sufficient because there are
normally padding bytes that must be discarded
The length variable is initialized in Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)
,
an attempt to call getLength() prior to getDataStream() will result in IllegalStateException.
getLength
in class Decryptor
getDataStream(DirectoryNode)
Copyright 2016 The Apache Software Foundation or its licensors, as applicable.