Package com.healthmarketscience.jackcess.crypt.impl

Class BaseCryptCodecHandler

java.lang.Object

com.healthmarketscience.jackcess.crypt.impl.BaseCryptCodecHandler

All Implemented Interfaces:

CodecHandler

Direct Known Subclasses:

BaseJetCryptCodecHandler, OfficeCryptCodecHandler

public abstract class BaseCryptCodecHandler
extends Object
implements CodecHandler

Common CodecHandler support.

Author:

Vladimir Berezniker

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	CIPHER_DECRYPT_MODE
static boolean	CIPHER_ENCRYPT_MODE

Method Summary

Modifier and Type	Method	Description
static byte[]	applyPageNumber(byte[] key, int offset, int pageNumber)	Returns a copy of the given key with the bytes of the given pageNumber applied at the given offset using XOR.
static byte[]	fill(byte[] bytes, int value)	Fills the given array with the given value and returns it.
static byte[]	fixToLength(byte[] bytes, int len)
static byte[]	fixToLength(byte[] bytes, int len, int padByte)
static byte[]	hash(Digest digest, byte[] bytes)	Hashes the given bytes using the given digest and returns the result.
static byte[]	hash(Digest digest, byte[] bytes1, byte[] bytes2)	Hashes the given bytes1 and bytes2 using the given digest and returns the result.
static byte[]	hash(Digest digest, byte[] bytes1, byte[] bytes2, int resultLen)	Hashes the given bytes1 and bytes2 using the given digest and returns the hash fixed to the given length.
static byte[]	hash(Digest digest, byte[] bytes, int resultLen)	Hashes the given bytes using the given digest and returns the hash fixed to the given length.
String	toString()
static ByteBuffer	wrap(byte[] bytes)

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.healthmarketscience.jackcess.impl.CodecHandler

canDecodeInline, canEncodePartialPage, decodePage, encodePage

Field Detail

CIPHER_DECRYPT_MODE

public static final boolean CIPHER_DECRYPT_MODE

See Also:

Constant Field Values

CIPHER_ENCRYPT_MODE

public static final boolean CIPHER_ENCRYPT_MODE

See Also:

Constant Field Values

Method Detail

toString

public String toString()

Overrides:

toString in class Object

applyPageNumber

public static byte[] applyPageNumber(byte[] key,
                                     int offset,
                                     int pageNumber)

Returns a copy of the given key with the bytes of the given pageNumber applied at the given offset using XOR.

hash

public static byte[] hash(Digest digest,
                          byte[] bytes)

Hashes the given bytes using the given digest and returns the result.

hash

public static byte[] hash(Digest digest,
                          byte[] bytes1,
                          byte[] bytes2)

Hashes the given bytes1 and bytes2 using the given digest and returns the result.

hash

public static byte[] hash(Digest digest,
                          byte[] bytes,
                          int resultLen)

Hashes the given bytes using the given digest and returns the hash fixed to the given length.

hash

public static byte[] hash(Digest digest,
                          byte[] bytes1,
                          byte[] bytes2,
                          int resultLen)

Hashes the given bytes1 and bytes2 using the given digest and returns the hash fixed to the given length.

fixToLength

public static byte[] fixToLength(byte[] bytes,
                                 int len)

Returns:

a byte array of the given length, truncating or padding the given byte array as necessary.

fixToLength

public static byte[] fixToLength(byte[] bytes,
                                 int len,
                                 int padByte)

Returns:

a byte array of the given length, truncating or padding the given byte array as necessary using the given padByte.

wrap

public static ByteBuffer wrap(byte[] bytes)

Returns:

a new ByteBuffer wrapping the given bytes with the appropriate byte order

fill

public static byte[] fill(byte[] bytes,
                          int value)

Fills the given array with the given value and returns it.