Class StandardDecryptor
java.lang.Object
org.apache.poi.poifs.crypt.Decryptor
org.apache.poi.poifs.crypt.standard.StandardDecryptor
- All Implemented Interfaces:
Cloneable
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Field Summary
Fields inherited from class org.apache.poi.poifs.crypt.Decryptor
DEFAULT_PASSWORD, DEFAULT_POIFS_ENTRY, encryptionInfo
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionclone()
protected static byte[]
fillAndXor
(byte[] hash, byte fillByte) protected static SecretKey
generateSecretKey
(String password, EncryptionVerifier ver, int keySize) Return a stream with decrypted data.long
Returns the length of the encrypted data that can be safely read withDecryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)
.boolean
verifyPassword
(String password) Methods inherited from class org.apache.poi.poifs.crypt.Decryptor
getBlockSizeInBytes, getDataStream, getDataStream, getEncryptionInfo, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getKeySizeInBytes, getSecretKey, getVerifier, initCipherForBlock, setChunkSize, setEncryptionInfo, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier
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Constructor Details
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StandardDecryptor
protected StandardDecryptor()
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Method Details
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verifyPassword
- Specified by:
verifyPassword
in classDecryptor
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generateSecretKey
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fillAndXor
protected static byte[] fillAndXor(byte[] hash, byte fillByte) -
getDataStream
Description copied from class:Decryptor
Return a stream with decrypted data.Use
Decryptor.getLength()
to get the size of that data that can be safely read from the stream. Just reading to the end of the input stream is not sufficient because there are normally padding bytes that must be discarded- Specified by:
getDataStream
in classDecryptor
- Parameters:
dir
- the node to read from- Returns:
- decrypted stream
- Throws:
IOException
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getLength
public long getLength()Description copied from class:Decryptor
Returns the length of the encrypted data that can be safely read withDecryptor.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 discardedThe 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.- Specified by:
getLength
in classDecryptor
- Returns:
- the length of the stream returned by
getDataStream(DirectoryNode)
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clone
- Overrides:
clone
in classDecryptor
- Throws:
CloneNotSupportedException
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