Package org.bouncycastle.openpgp.operator.bc

Class BcPBEDataDecryptorFactory

java.lang.Object

org.bouncycastle.openpgp.operator.PBEDataDecryptorFactory

org.bouncycastle.openpgp.operator.bc.BcPBEDataDecryptorFactory

All Implemented Interfaces:

PGPDataDecryptorFactory

public class BcPBEDataDecryptorFactory
extends PBEDataDecryptorFactory

A PBEDataDecryptorFactory for handling PBE decryption operations using the Bouncy Castle lightweight API to implement cryptographic primitives.

Constructor Summary

Constructors

Constructor	Description
BcPBEDataDecryptorFactory(char[] pass, PGPDigestCalculatorProvider calculatorProvider)	Base constructor.

Method Summary

Modifier and Type	Method	Description
PGPDataDecryptor	createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)	Constructs a data decryptor for SED or v1 SEIPD packets.
PGPDataDecryptor	createDataDecryptor(AEADEncDataPacket aeadEncDataPacket, PGPSessionKey sessionKey)	Constructs a data decryptor for AEAD Encrypted Data packets.
PGPDataDecryptor	createDataDecryptor(SymmetricEncIntegrityPacket seipd, PGPSessionKey sessionKey)	Constructs a data decryptor for v2 SEIPD packets.
byte[]	recoverAEADEncryptedSessionData(SymmetricKeyEncSessionPacket keyData, byte[] ikm)	Recover the session data of a v5 SKESK or v6 SKESK packet.
byte[]	recoverSessionData(int keyAlgorithm, byte[] key, byte[] secKeyData)	Recover the session key from a version 4 SKESK packet used in OpenPGP v4.

Methods inherited from class org.bouncycastle.openpgp.operator.PBEDataDecryptorFactory

makeKeyFromPassPhrase

Methods inherited from class java.lang.Object

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

Constructor Details

BcPBEDataDecryptorFactory

public BcPBEDataDecryptorFactory(char[] pass,
 PGPDigestCalculatorProvider calculatorProvider)

Base constructor.

Parameters:

pass - the passphrase to use as the primary source of key material.

calculatorProvider - a digest calculator provider to provide calculators to support the key generation calculation required.

Method Details

recoverSessionData

public byte[] recoverSessionData(int keyAlgorithm,
 byte[] key,
 byte[] secKeyData)
                          throws PGPException

Recover the session key from a version 4 SKESK packet used in OpenPGP v4.

Specified by:

recoverSessionData in class PBEDataDecryptorFactory

Parameters:

keyAlgorithm - the encryption algorithm used to encrypt the session data.

key - the key bytes for the encryption algorithm.

secKeyData - the encrypted session data to decrypt.

Returns:

session key

Throws:

PGPException

recoverAEADEncryptedSessionData

public byte[] recoverAEADEncryptedSessionData(SymmetricKeyEncSessionPacket keyData,
 byte[] ikm)
                                       throws PGPException

Description copied from class: PBEDataDecryptorFactory

Recover the session data of a v5 SKESK or v6 SKESK packet. These are used in OpenPGP v5 and v6.

Specified by:

recoverAEADEncryptedSessionData in class PBEDataDecryptorFactory

Parameters:

keyData - v5 or v6 SKESK packet

ikm - initial keying material (e.g. S2K result)

Returns:

session key

Throws:

PGPException

createDataDecryptor

public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket,
 int encAlgorithm,
 byte[] key)
                                     throws PGPException

Description copied from interface: PGPDataDecryptorFactory

Constructs a data decryptor for SED or v1 SEIPD packets.

Parameters:

withIntegrityPacket - true if the packet to be decrypted has integrity checking enabled.

encAlgorithm - the identifier of the encryption algorithm to decrypt with.

key - the bytes of the key for the cipher.

Returns:

a data decryptor that can decrypt (and verify) streams of encrypted data.

Throws:

PGPException - if an error occurs initialising the decryption and integrity checking functions.

createDataDecryptor

public PGPDataDecryptor createDataDecryptor(AEADEncDataPacket aeadEncDataPacket,
 PGPSessionKey sessionKey)
                                     throws PGPException

Description copied from interface: PGPDataDecryptorFactory

Constructs a data decryptor for AEAD Encrypted Data packets. This method is used with OpenPGP v5 AEAD.

Parameters:

aeadEncDataPacket - AEAD encrypted data packet

sessionKey - decrypted session key

Returns:

a data decryptor that can decrypt (and verify) streams of encrypted data.

Throws:

PGPException - if an error occurs initialising the decryption and integrity checking functions.

createDataDecryptor

public PGPDataDecryptor createDataDecryptor(SymmetricEncIntegrityPacket seipd,
 PGPSessionKey sessionKey)
                                     throws PGPException

Description copied from interface: PGPDataDecryptorFactory

Constructs a data decryptor for v2 SEIPD packets. This method is used with OpenPGP v6 AEAD.

Parameters:

seipd - version 2 symmetrically encrypted integrity-protected data packet using AEAD.

sessionKey - decrypted session key

Returns:

a data decryptor that can decrypt (and verify) streams of encrypted data.

Throws:

PGPException - if an error occurs initialising the decryption and integrity checking functions.