Package org.apache.poi.poifs.crypt

Class EncryptionInfo

java.lang.Object

org.apache.poi.poifs.crypt.EncryptionInfo

All Implemented Interfaces:

java.lang.Cloneable

public class EncryptionInfo
extends java.lang.Object
implements java.lang.Cloneable

This class may require poi-ooxml to be on the classpath to load some EncryptionModes.

See Also:

getBuilder(EncryptionMode)

Field Summary

Fields

Modifier and Type	Field	Description
static BitField	flagAES	A value that MUST be 1 if the protected content is an ECMA-376 document ECMA-376.
static BitField	flagCryptoAPI	A flag that specifies whether CryptoAPI RC4 or ECMA-376 encryption ECMA-376 is used.
static BitField	flagDocProps	A value that MUST be 0 if document properties are encrypted.
static BitField	flagExternal	A value that MUST be 1 if extensible encryption is used.

Constructor Summary

Constructors

Constructor	Description
EncryptionInfo(EncryptionMode encryptionMode)	Prepares for encryption, using the given Encryption Mode, and all other parameters as default.
EncryptionInfo(EncryptionMode encryptionMode, CipherAlgorithm cipherAlgorithm, HashAlgorithm hashAlgorithm, int keyBits, int blockSize, ChainingMode chainingMode)	Constructs an EncryptionInfo from scratch
EncryptionInfo(DirectoryNode dir)	Opens for decryption
EncryptionInfo(POIFSFileSystem fs)	Opens for decryption
EncryptionInfo(LittleEndianInput dis, EncryptionMode preferredEncryptionMode)

Method Summary

Modifier and Type	Method	Description
EncryptionInfo	clone()
Decryptor	getDecryptor()
int	getEncryptionFlags()
EncryptionMode	getEncryptionMode()
Encryptor	getEncryptor()
EncryptionHeader	getHeader()
EncryptionVerifier	getVerifier()
int	getVersionMajor()
int	getVersionMinor()
boolean	isDocPropsEncrypted()
void	setDecryptor(Decryptor decryptor)
void	setEncryptor(Encryptor encryptor)
void	setHeader(EncryptionHeader header)
void	setVerifier(EncryptionVerifier verifier)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

flagCryptoAPI

public static final BitField flagCryptoAPI

A flag that specifies whether CryptoAPI RC4 or ECMA-376 encryption ECMA-376 is used. It MUST be 1 unless flagExternal is 1. If flagExternal is 1, it MUST be 0.

flagDocProps

public static final BitField flagDocProps

A value that MUST be 0 if document properties are encrypted. The encryption of document properties is specified in section 2.3.5.4.

flagExternal

public static final BitField flagExternal

A value that MUST be 1 if extensible encryption is used. If this value is 1, the value of every other field in this structure MUST be 0.

flagAES

public static final BitField flagAES

A value that MUST be 1 if the protected content is an ECMA-376 document ECMA-376. If the fAES bit is 1, the fCryptoAPI bit MUST also be 1.

Constructor Detail

EncryptionInfo

public EncryptionInfo(POIFSFileSystem fs)
               throws java.io.IOException

Opens for decryption

Throws:

java.io.IOException

EncryptionInfo

public EncryptionInfo(DirectoryNode dir)
               throws java.io.IOException

Opens for decryption

Throws:

java.io.IOException

EncryptionInfo

public EncryptionInfo(LittleEndianInput dis,
                      EncryptionMode preferredEncryptionMode)
               throws java.io.IOException

Throws:

java.io.IOException

EncryptionInfo

public EncryptionInfo(EncryptionMode encryptionMode)

Prepares for encryption, using the given Encryption Mode, and all other parameters as default.

See Also:

EncryptionInfo(EncryptionMode, CipherAlgorithm, HashAlgorithm, int, int, ChainingMode)

EncryptionInfo

public EncryptionInfo(EncryptionMode encryptionMode,
                      CipherAlgorithm cipherAlgorithm,
                      HashAlgorithm hashAlgorithm,
                      int keyBits,
                      int blockSize,
                      ChainingMode chainingMode)

Constructs an EncryptionInfo from scratch

Parameters:

encryptionMode - see EncryptionMode for values, EncryptionMode.cryptoAPI is for internal use only, as it's record based

cipherAlgorithm - the cipher algorithm

hashAlgorithm - the hash algorithm

keyBits - the bit count of the key

blockSize - the size of a cipher block

chainingMode - the chaining mode

Throws:

EncryptedDocumentException - if the given parameters mismatch, e.g. only certain combinations of keyBits, blockSize are allowed for a given CipherAlgorithm

Method Detail

getVersionMajor

public int getVersionMajor()

getVersionMinor

public int getVersionMinor()

getEncryptionFlags

public int getEncryptionFlags()

getHeader

public EncryptionHeader getHeader()

getVerifier

public EncryptionVerifier getVerifier()

getDecryptor

public Decryptor getDecryptor()

getEncryptor

public Encryptor getEncryptor()

setHeader

public void setHeader(EncryptionHeader header)

setVerifier

public void setVerifier(EncryptionVerifier verifier)

setDecryptor

public void setDecryptor(Decryptor decryptor)

setEncryptor

public void setEncryptor(Encryptor encryptor)

getEncryptionMode

public EncryptionMode getEncryptionMode()

isDocPropsEncrypted

public boolean isDocPropsEncrypted()

Returns:

true, if Document Summary / Summary are encrypted and stored in the EncryptedStream stream, otherwise the Summaries aren't encrypted and located in their usual streams

clone

public EncryptionInfo clone()
                     throws java.lang.CloneNotSupportedException

Throws:

java.lang.CloneNotSupportedException