com.healthmarketscience.jackcess.impl.office

Class ECMAStandardEncryptionProvider

java.lang.Object

com.healthmarketscience.jackcess.impl.BaseCryptCodecHandler

com.healthmarketscience.jackcess.impl.OfficeCryptCodecHandler

com.healthmarketscience.jackcess.impl.office.BlockCipherProvider

com.healthmarketscience.jackcess.impl.office.ECMAStandardEncryptionProvider

All Implemented Interfaces:

com.healthmarketscience.jackcess.impl.CodecHandler

public class ECMAStandardEncryptionProvider
extends BlockCipherProvider

Nested Class Summary

Nested classes/interfaces inherited from class com.healthmarketscience.jackcess.impl.OfficeCryptCodecHandler

OfficeCryptCodecHandler.Phase

Field Summary

Fields

Modifier and Type	Field and Description
private byte[]	_baseHash
private int	_encKeyByteSize
private EncryptionHeader	_header
private EncryptionVerifier	_verifier
private static int	HASH_ITERATIONS
private static java.util.Set<EncryptionHeader.CryptoAlgorithm>	VALID_CRYPTO_ALGOS
private static java.util.Set<EncryptionHeader.HashAlgorithm>	VALID_HASH_ALGOS

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

CIPHER_DECRYPT_MODE, CIPHER_ENCRYPT_MODE

Constructor Summary

Constructors

Constructor and Description
ECMAStandardEncryptionProvider(com.healthmarketscience.jackcess.impl.PageChannel channel, byte[] encodingKey, java.nio.ByteBuffer encProvBuf, byte[] pwdBytes)

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.
private org.bouncycastle.crypto.params.KeyParameter	computeEncryptionKey(byte[] blockBytes)
private byte[]	cryptDeriveKey(byte[] baseHash, byte[] blockBytes, int iterations, int keyByteLen)
private static byte[]	genXBytes(byte[] finalHash, int code)
protected org.bouncycastle.crypto.BlockCipher	initCipher()
protected org.bouncycastle.crypto.Digest	initDigest()
protected boolean	verifyPassword(byte[] pwdBytes)

Methods inherited from class com.healthmarketscience.jackcess.impl.office.BlockCipherProvider

canDecodeInline, canEncodePartialPage, decodePageImpl, encodePageImpl, getBlockCipher, initCryptCipher, initPwdCipher, reset

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

bits2bytes, create, decodePage, encodePage, getDigest, getPhase, initCryptDigest, initPwdDigest, int2bytes, iterateHash

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

applyPageNumber, blockDecrypt, blockDecryptBytes, blockEncrypt, decryptBytes, decryptBytes, decryptInit, decryptInit, encryptInit, encryptInit, fill, fixToLength, fixToLength, getCipherParams, getEncodingKey, getEncodingKey, getStreamCipher, 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

VALID_CRYPTO_ALGOS

private static final java.util.Set<EncryptionHeader.CryptoAlgorithm> VALID_CRYPTO_ALGOS

VALID_HASH_ALGOS

private static final java.util.Set<EncryptionHeader.HashAlgorithm> VALID_HASH_ALGOS

HASH_ITERATIONS

private static final int HASH_ITERATIONS

See Also:

Constant Field Values

_header

private final EncryptionHeader _header

_verifier

private final EncryptionVerifier _verifier

_baseHash

private final byte[] _baseHash

_encKeyByteSize

private final int _encKeyByteSize

Constructor Detail

ECMAStandardEncryptionProvider

public ECMAStandardEncryptionProvider(com.healthmarketscience.jackcess.impl.PageChannel channel,
                                      byte[] encodingKey,
                                      java.nio.ByteBuffer encProvBuf,
                                      byte[] pwdBytes)
                               throws java.io.IOException

Throws:

java.io.IOException

Method Detail

initDigest

protected org.bouncycastle.crypto.Digest initDigest()

Overrides:

initDigest in class OfficeCryptCodecHandler

initCipher

protected org.bouncycastle.crypto.BlockCipher initCipher()

Overrides:

initCipher in class BlockCipherProvider

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

verifyPassword

protected boolean verifyPassword(byte[] pwdBytes)

Specified by:

verifyPassword in class OfficeCryptCodecHandler

computeEncryptionKey

private org.bouncycastle.crypto.params.KeyParameter computeEncryptionKey(byte[] blockBytes)

cryptDeriveKey

private byte[] cryptDeriveKey(byte[] baseHash,
                              byte[] blockBytes,
                              int iterations,
                              int keyByteLen)

genXBytes

private static byte[] genXBytes(byte[] finalHash,
                                int code)