com.healthmarketscience.jackcess.impl

Class MSISAMCryptCodecHandler

java.lang.Object

com.healthmarketscience.jackcess.impl.BaseCryptCodecHandler

com.healthmarketscience.jackcess.impl.BaseJetCryptCodecHandler

com.healthmarketscience.jackcess.impl.MSISAMCryptCodecHandler

All Implemented Interfaces:

com.healthmarketscience.jackcess.impl.CodecHandler

public class MSISAMCryptCodecHandler
extends BaseJetCryptCodecHandler

CodecHandler for MSISAM databases.

Field Summary

Fields

Modifier and Type	Field and Description
private byte[]	_baseHash
private static int	CRYPT_CHECK_START
private static int	ENCRYPTION_FLAGS_OFFSET
private static int	MSISAM_MAX_ENCRYPTED_PAGE
private static int	NEW_ENCRYPTION
private static int	PASSWORD_DIGEST_LENGTH
private static int	PASSWORD_LENGTH
private static int	SALT_LENGTH
private static int	SALT_OFFSET
private static int	TRAILING_PWD_LEN
private static int	USE_SHA1

Fields inherited from class com.healthmarketscience.jackcess.impl.BaseCryptCodecHandler

CIPHER_DECRYPT_MODE, CIPHER_ENCRYPT_MODE

Constructor Summary

Constructors

Constructor and Description
MSISAMCryptCodecHandler(com.healthmarketscience.jackcess.impl.PageChannel channel, java.lang.String password, java.nio.charset.Charset charset, java.nio.ByteBuffer buffer)

Method Summary

Modifier and Type	Method and Description
protected org.bouncycastle.crypto.params.KeyParameter	computeCipherParams(int pageNumber) Generates the cipher parameters for the given page number.
static com.healthmarketscience.jackcess.impl.CodecHandler	create(PasswordCallback callback, com.healthmarketscience.jackcess.impl.PageChannel channel, java.nio.charset.Charset charset)
private static byte[]	createPasswordDigest(java.nio.ByteBuffer buffer, java.lang.String password, java.nio.charset.Charset charset)
protected int	getMaxEncodedPage()
private static byte[]	getOldDecryptionKey(java.nio.ByteBuffer buffer, com.healthmarketscience.jackcess.impl.JetFormat format)
private static byte[]	getPasswordTestBytes(java.nio.ByteBuffer buffer)
private static void	hashSalt(byte[] salt, byte[] hashData)
private void	verifyPassword(java.nio.ByteBuffer buffer, byte[] testEncodingKey, byte[] testBytes)

Methods inherited from class com.healthmarketscience.jackcess.impl.BaseJetCryptCodecHandler

canDecodeInline, canEncodePartialPage, decodePage, encodePage, getStreamCipher

Methods inherited from class com.healthmarketscience.jackcess.impl.BaseCryptCodecHandler

applyPageNumber, blockDecrypt, blockDecryptBytes, blockEncrypt, decryptBytes, decryptBytes, decryptInit, decryptInit, encryptInit, encryptInit, fill, fixToLength, fixToLength, getBlockCipher, getCipherParams, getEncodingKey, getEncodingKey, getTempBuffer, hash, hash, hash, hash, isBlankKey, processBytesFully, readHeaderPage, streamDecrypt, streamEncrypt, toString, wrap

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

SALT_OFFSET

private static final int SALT_OFFSET

See Also:

Constant Field Values

CRYPT_CHECK_START

private static final int CRYPT_CHECK_START

See Also:

Constant Field Values

ENCRYPTION_FLAGS_OFFSET

private static final int ENCRYPTION_FLAGS_OFFSET

See Also:

Constant Field Values

SALT_LENGTH

private static final int SALT_LENGTH

See Also:

Constant Field Values

PASSWORD_LENGTH

private static final int PASSWORD_LENGTH

See Also:

Constant Field Values

USE_SHA1

private static final int USE_SHA1

See Also:

Constant Field Values

PASSWORD_DIGEST_LENGTH

private static final int PASSWORD_DIGEST_LENGTH

See Also:

Constant Field Values

MSISAM_MAX_ENCRYPTED_PAGE

private static final int MSISAM_MAX_ENCRYPTED_PAGE

See Also:

Constant Field Values

NEW_ENCRYPTION

private static final int NEW_ENCRYPTION

See Also:

Constant Field Values

TRAILING_PWD_LEN

private static final int TRAILING_PWD_LEN

See Also:

Constant Field Values

_baseHash

private final byte[] _baseHash

Constructor Detail

MSISAMCryptCodecHandler

MSISAMCryptCodecHandler(com.healthmarketscience.jackcess.impl.PageChannel channel,
                        java.lang.String password,
                        java.nio.charset.Charset charset,
                        java.nio.ByteBuffer buffer)
                 throws java.io.IOException

Throws:

java.io.IOException

Method Detail

create

public static com.healthmarketscience.jackcess.impl.CodecHandler create(PasswordCallback callback,
                                                                        com.healthmarketscience.jackcess.impl.PageChannel channel,
                                                                        java.nio.charset.Charset charset)
                                                                 throws java.io.IOException

Throws:

java.io.IOException

computeCipherParams

protected org.bouncycastle.crypto.params.KeyParameter computeCipherParams(int pageNumber)

Description copied from class: BaseCryptCodecHandler

Generates the cipher parameters for the given page number.

Specified by:

computeCipherParams in class BaseCryptCodecHandler

getMaxEncodedPage

protected int getMaxEncodedPage()

Specified by:

getMaxEncodedPage in class BaseJetCryptCodecHandler

verifyPassword

private void verifyPassword(java.nio.ByteBuffer buffer,
                            byte[] testEncodingKey,
                            byte[] testBytes)

createPasswordDigest

private static byte[] createPasswordDigest(java.nio.ByteBuffer buffer,
                                           java.lang.String password,
                                           java.nio.charset.Charset charset)

getOldDecryptionKey

private static byte[] getOldDecryptionKey(java.nio.ByteBuffer buffer,
                                          com.healthmarketscience.jackcess.impl.JetFormat format)

getPasswordTestBytes

private static byte[] getPasswordTestBytes(java.nio.ByteBuffer buffer)

hashSalt

private static void hashSalt(byte[] salt,
                             byte[] hashData)