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oracle.security.crypto.core
Class PasswordBasedMAC

java.lang.Object
oracle.security.crypto.core.MessageDigest
oracle.security.crypto.core.PasswordBasedMAC

All Implemented Interfaces:

java.lang.Cloneable

public class PasswordBasedMAC

extends MessageDigest

The password-base MAC algorithm, as defined in CRMF (RFC 2511). Supports HMAC-SHA1 and HMAC-MD5 for the underlying keyed MAC algorithm.

Since:

2.2

See Also:

PBMacAlgID

Nested Class Summary

Nested classes/interfaces inherited from class oracle.security.crypto.core.MessageDigest

MessageDigest.MDState

Field Summary

static int	DEFAULT_ITER_COUNT Default password-based key derivation iteration count.
static AlgorithmIdentifier	DEFAULT_MAC Default password-based MAC algorithm is HMAC-SHA.
static AlgorithmIdentifier	DEFAULT_OWF Default password-based key derivation hash function is SHA-1.
static int	DEFAULT_SALT_LEN Default password-based key derivation salt length.

Fields inherited from class oracle.security.crypto.core.MessageDigest

algID

Constructor Summary

PasswordBasedMAC()
Creates a new PasswordBasedMAC instance.

PasswordBasedMAC(AlgorithmIdentifier algID, byte[] password)
Creates a new PasswordBasedMAC instance with the given algorithm identifier and password.

PasswordBasedMAC(AlgorithmIdentifier algID, byte[] password, RandomBitsSource rbs)
Creates a new PasswordBasedMAC instance with the given algorithm identifier and password.

PasswordBasedMAC(byte[] password)
Creates a new PasswordBasedMAC instance with the given password.

Method Summary

java.lang.String	algName() Returns the algorithm name of this message digest.
int	blockSize() Returns the blocksize of this instance.
java.lang.Object	clone() Returns a clone of this message digest object.
void	computeCurrent() Completes the hash computation, performing any necessary operations such as padding.
AlgorithmIdentifier	getAlgID() Returns the algorithm identifier for this PasswordBasedMAC.
int	getCount() Returns the iteration count to use for password-based key derivation.
byte[]	getDigestBits() Returns a copy of the current digest bytes.
int	getDigestLength() Returns the length in bytes of the message digest.
AlgorithmIdentifier	getMacAlgID() Returns the keyed MAC algorithm to use.
AlgorithmIdentifier	getOwfAlgID() Returns the one-way (hash) function to use for password-based key derivation.
byte[]	getSalt() Gets the salt value used in this PasswordBasedMAC.
protected MessageDigest.MDState	getState() Gets the state of this MessageDigest instance.
void	init() Resets this message digest object to its initial state.
boolean	isValid() Returns true if this PasswordBasedMAC is in a valid state and its digest bits are usable; otherwise returns false.
void	setAlgID(AlgorithmIdentifier algID) Sets the algorithm identifier for this PasswordBasedMAC.
void	setCount(int count) Sets the iteration count to use for password-based key derivation.
void	setMacAlgID(AlgorithmIdentifier macAlgID) Sets the keyed MAC algorithm to use.
void	setOwfAlgID(AlgorithmIdentifier owfAlgID) Sets the one-way (hash) function to use for password-based key derivation.
void	setPassword(byte[] password) Sets the password to be used for this PasswordBasedMAC.
void	setRandomBitsSource(RandomBitsSource rbs) Sets the RNG to use for generating random salt bytes, if needed.
void	setSalt(byte[] salt) Sets the salt value.
protected void	setState(MessageDigest.MDState state) Sets the state of this MessageDigest instance.
void	update(byte b) Adds the specifed byte to the data being digested.
void	update(byte[] input, int off, int len) Adds the specified sequence of bytes to the data being digested.

Methods inherited from class oracle.security.crypto.core.MessageDigest

computeDigest, computeDigest, getInstance, isEqual, toString, update, update, update, update, update, update, update, update, update, update, update, updateASCII

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SALT_LEN

public static final int DEFAULT_SALT_LEN

Default password-based key derivation salt length.

See Also:

PKCS5.DEFAULT_SALT_LEN, Constant Field Values

DEFAULT_OWF

public static final AlgorithmIdentifier DEFAULT_OWF

Default password-based key derivation hash function is SHA-1.

DEFAULT_ITER_COUNT

public static final int DEFAULT_ITER_COUNT

Default password-based key derivation iteration count.

See Also:

PKCS5.DEFAULT_ITER_COUNT, Constant Field Values

DEFAULT_MAC

public static final AlgorithmIdentifier DEFAULT_MAC

Default password-based MAC algorithm is HMAC-SHA.

Constructor Detail

PasswordBasedMAC

public PasswordBasedMAC()

Creates a new PasswordBasedMAC instance.

PasswordBasedMAC

public PasswordBasedMAC(byte[] password)
                 throws AlgorithmIdentifierException

Creates a new PasswordBasedMAC instance with the given password. The default algorithm identifier AlgID.PasswordBasedMac will be used.

Parameters:

password - The password to use.

Throws:

AlgorithmIdentiferException - If algID does not identify a password-based MAC or if an error occurs processing the parameters.

AlgorithmIdentifierException

PasswordBasedMAC

public PasswordBasedMAC(AlgorithmIdentifier algID,
                        byte[] password)
                 throws AlgorithmIdentifierException

Creates a new PasswordBasedMAC instance with the given algorithm identifier and password.

Parameters:

algID - The algorithm identifier to use.

password - The password to use.

Throws:

AlgorithmIdentiferException - If algID does not identify a password-based MAC or if an error occurs processing the parameters.

AlgorithmIdentifierException

See Also:

PBMacAlgID

PasswordBasedMAC

public PasswordBasedMAC(AlgorithmIdentifier algID,
                        byte[] password,
                        RandomBitsSource rbs)
                 throws AlgorithmIdentifierException

Creates a new PasswordBasedMAC instance with the given algorithm identifier and password. Use this constructor if algID does not contain parameters; the given RandomBitsSource will be used to generate the salt bytes.

Parameters:

algID - The algorithm identifier to use.

password - The password to use.

rbs - The RNG to use for generating the salt bytes.

Throws:

AlgorithmIdentiferException - If algID does not identify a password-based MAC or if an error occurs processing the parameters.

AlgorithmIdentifierException

See Also:

PBMacAlgID

Method Detail

setAlgID

public void setAlgID(AlgorithmIdentifier algID)
              throws AlgorithmIdentifierException

Sets the algorithm identifier for this PasswordBasedMAC.

Overrides:

setAlgID in class MessageDigest

Parameters:

algID - The algorithm identifier to use.

Throws:

AlgorithmIdentiferException - If algID does not identify a password-based MAC or if an error occurs processing the parameters.

AlgorithmIdentifierException

See Also:

PBMacAlgID

getAlgID

public AlgorithmIdentifier getAlgID()

Returns the algorithm identifier for this PasswordBasedMAC.

If all of the parameter fields (salt, one-way function algorithm, iteration count and MAC algorithm) are defined (or defaults can be used and/or generated), then a new PBMacAlgID containing the parameters is returned; otherwise a PBMacAlgID with no parameters is returned.

Specified by:

getAlgID in class MessageDigest

Returns:

An AlgorithIdentifier object representing the hash algorithm of this MessageDigest instance.

Throws:

java.lang.IllegalStateException - If an error occurs constructing a new PBMacAlgID using the parameters present in this PasswordBasedMAC.

See Also:

PBMacAlgID

setSalt

public void setSalt(byte[] salt)

Sets the salt value.

Parameters:

salt - The salt value to use for password-based key derivation.

See Also:

PBMacAlgID

getSalt

public byte[] getSalt()

Gets the salt value used in this PasswordBasedMAC.

Returns:

A byte array containing the salt value, or null is none is present.

See Also:

PBMacAlgID

setOwfAlgID

public void setOwfAlgID(AlgorithmIdentifier owfAlgID)
                 throws AlgorithmIdentifierException

Sets the one-way (hash) function to use for password-based key derivation.

Parameters:

owfAlgID - The algorithm identifier for the password-based key derivation one-way (hash) function.

Throws:

AlgorithmIdentifierException

See Also:

PBMacAlgID

getOwfAlgID

public AlgorithmIdentifier getOwfAlgID()

Returns the one-way (hash) function to use for password-based key derivation.

Returns:

The algorithm identifier for the password-based key derivation one-way (hash) function, or null if none is present.

See Also:

PBMacAlgID

setCount

public void setCount(int count)

Sets the iteration count to use for password-based key derivation.

Parameters:

count - The iteration count to use for password-based key derivation.

See Also:

PBMacAlgID

getCount

public int getCount()

Returns the iteration count to use for password-based key derivation.

Returns:

The iteration count to use for password-based key derivation.

See Also:

PBMacAlgID

setMacAlgID

public void setMacAlgID(AlgorithmIdentifier macAlgID)
                 throws AlgorithmIdentifierException

Sets the keyed MAC algorithm to use.

Parameters:

macAlgID - The algorithm identifier for the keyed MAC algorithm.

Throws:

AlgorithmIdentifierException - If macAlgID does not identify a a supported MAC algorithm.

See Also:

PBMacAlgID

getMacAlgID

public AlgorithmIdentifier getMacAlgID()

Returns the keyed MAC algorithm to use.

Returns:

The algorithm identifier for the keyed MAC algorithm, or null if none is present.

See Also:

PBMacAlgID

setRandomBitsSource

public void setRandomBitsSource(RandomBitsSource rbs)

Sets the RNG to use for generating random salt bytes, if needed.

Parameters:

rbs - The RNG to use for generating random salt bytes.

See Also:

PBMacAlgID

setPassword

public void setPassword(byte[] password)

Sets the password to be used for this PasswordBasedMAC.

Parameters:

password - The bytes of the password.

init

public void init()

Description copied from class: MessageDigest

Resets this message digest object to its initial state.

Specified by:

init in class MessageDigest

blockSize

public int blockSize()

Description copied from class: MessageDigest

Returns the blocksize of this instance.

Specified by:

blockSize in class MessageDigest

update

public void update(byte b)

Description copied from class: MessageDigest

Adds the specifed byte to the data being digested.

Specified by:

update in class MessageDigest

update

public void update(byte[] input,
                   int off,
                   int len)

Description copied from class: MessageDigest

Adds the specified sequence of bytes to the data being digested.

Overrides:

update in class MessageDigest

Parameters:

input - the input array

off - start position in the input array

len - the number of input array elements to add to the data being digested

computeCurrent

public void computeCurrent()

Description copied from class: MessageDigest

Completes the hash computation, performing any necessary operations such as padding. The result of the hash can be obtained using MessageDigest.getDigestBits().

Specified by:

computeCurrent in class MessageDigest

algName

public java.lang.String algName()

Description copied from class: MessageDigest

Returns the algorithm name of this message digest.

Specified by:

algName in class MessageDigest

getDigestLength

public int getDigestLength()

Description copied from class: MessageDigest

Returns the length in bytes of the message digest.

Specified by:

getDigestLength in class MessageDigest

getDigestBits

public byte[] getDigestBits()

Returns a copy of the current digest bytes.

Overrides:

getDigestBits in class MessageDigest

isValid

public boolean isValid()

Returns true if this PasswordBasedMAC is in a valid state and its digest bits are usable; otherwise returns false.

Overrides:

isValid in class MessageDigest

clone

public java.lang.Object clone()

Description copied from class: MessageDigest

Returns a clone of this message digest object.

Specified by:

clone in class MessageDigest

getState

protected MessageDigest.MDState getState()

Description copied from class: MessageDigest

Gets the state of this MessageDigest instance.

Specified by:

getState in class MessageDigest

setState

protected void setState(MessageDigest.MDState state)

Description copied from class: MessageDigest

Sets the state of this MessageDigest instance.

Specified by:

setState in class MessageDigest

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