Package org.conscrypt

Class HpkeContextSender

java.lang.Object

org.conscrypt.HpkeContext

org.conscrypt.HpkeContextSender

public class HpkeContextSender
extends HpkeContext

Hybrid Public Key Encryption (HPKE) sender APIs.

See Also:

• HPKE RFC 9180 Sender subclass of HpkeContext. See base class for details.

Field Summary

Fields inherited from class org.conscrypt.HpkeContext

spi

Constructor Summary

Constructors

Modifier	Constructor	Description
private	HpkeContextSender(HpkeSpi spi)

Method Summary

Modifier and Type	Method	Description
byte[]	getEncapsulated()	Returns the encapsulated key created for this HpkeContextSender.
static HpkeContextSender	getInstance(String suite)	Returns an uninitialised HpkeContextSender.
static HpkeContextSender	getInstance(String suite, String providerName)	Returns an uninitialised HpkeContextSender from a specific Provider
static HpkeContextSender	getInstance(String suite, Provider provider)	Returns an uninitialised HpkeContextSender from a specific Provider
void	init(PublicKey recipientKey, byte[] info)	Initialises this HpkeContextSender in BASE mode, i.e.
void	init(PublicKey recipientKey, byte[] info, byte[] psk, byte[] psk_id)	Initialises this HpkeContextSender in PSK mode, i.e.
void	init(PublicKey recipientKey, byte[] info, PrivateKey senderKey)	Initialises this HpkeContextSender in AUTH mode, i.e.
void	init(PublicKey recipientKey, byte[] info, PrivateKey senderKey, byte[] psk, byte[] psk_id)	Initialises this HpkeContextSender in PSK_AUTH mode, i.e.
void	initForTesting(PublicKey recipientKey, byte[] info, byte[] sKe)	Initialises this HpkeContextSender for testing in BASE mode ONLY.
byte[]	seal(byte[] plaintext, byte[] aad)	Seals a message, using the internal key schedule maintained by this HpkeContextSender.

Methods inherited from class org.conscrypt.HpkeContext

export, findSpi, findSpi, findSpi, getSpi

Methods inherited from class java.lang.Object

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

Constructor Details

HpkeContextSender

private HpkeContextSender(HpkeSpi spi)

Method Details

getEncapsulated

public byte[] getEncapsulated()

Returns the encapsulated key created for this HpkeContextSender.

Returns:

the encapsulated key

Throws:

IllegalStateException - if this HpkeContextSender has not been initialised.

seal

public byte[] seal(byte[] plaintext,
 byte[] aad)

Seals a message, using the internal key schedule maintained by this HpkeContextSender.

Parameters:

plaintext - the plaintext

aad - optional associated data, may be null or empty

Returns:

the ciphertext

Throws:

NullPointerException - if the plaintext is null

IllegalStateException - if this HpkeContextSender has not been initialised

getInstance

public static HpkeContextSender getInstance(String suite)
                                     throws NoSuchAlgorithmException

Returns an uninitialised HpkeContextSender.

Parameters:

suite - the HPKE suite to use. @see HpkeSuite for details.

Returns:

an uninitialised HpkeContextSender for the requested suite

Throws:

NoSuchAlgorithmException - if no implementation could be found

getInstance

public static HpkeContextSender getInstance(String suite,
 String providerName)
                                     throws NoSuchAlgorithmException,
NoSuchProviderException

Returns an uninitialised HpkeContextSender from a specific Provider

Parameters:

suite - the HPKE suite to use. @see HpkeSuite for details.

providerName - the name of the Provider to use

Returns:

an uninitialised HpkeContextSender for the requested suite

Throws:

NoSuchAlgorithmException - if no implementation could be found

NoSuchProviderException - if providerName is null or no such Provider exists

getInstance

public static HpkeContextSender getInstance(String suite,
 Provider provider)
                                     throws NoSuchAlgorithmException,
NoSuchProviderException

Returns an uninitialised HpkeContextSender from a specific Provider

Parameters:

suite - the HPKE suite to use. @see HpkeSuite for details.

provider - the Provider to use

Returns:

an uninitialised HpkeContextSender for the requested suite

Throws:

NoSuchAlgorithmException - if no implementation could be found

NoSuchProviderException - if provider is null

init

public void init(PublicKey recipientKey,
 byte[] info)
          throws InvalidKeyException

Initialises this HpkeContextSender in BASE mode, i.e. with no sender authentication.

Parameters:

recipientKey - public key of the recipient

info - additional application-supplied information, may be null or empty

Throws:

InvalidKeyException - if recipientKey is null or an unsupported key format

UnsupportedOperationException - if mode is not a supported HPKE mode

IllegalStateException - if this HpkeContextSender has already been initialised

init

public void init(PublicKey recipientKey,
 byte[] info,
 PrivateKey senderKey)
          throws InvalidKeyException

Initialises this HpkeContextSender in AUTH mode, i.e. messages are authenticated using the sender's public key.

Parameters:

recipientKey - public key of the recipient

info - additional application-supplied information, may be null or empty

senderKey - private key of the sender

Throws:

InvalidKeyException - if either recipientKey or senderKey are null or an unsupported key format

UnsupportedOperationException - if mode is not a supported HPKE mode

IllegalStateException - if this HpkeContextSender has already been initialised

init

public void init(PublicKey recipientKey,
 byte[] info,
 byte[] psk,
 byte[] psk_id)
          throws InvalidKeyException

Initialises this HpkeContextSender in PSK mode, i.e. messages are authenticated using a pre-shared secret key.

Parameters:

recipientKey - public key of the recipient

info - additional application-supplied information, may be null or empty

psk - the a pre-shared secret key

psk_id - the id of the pre-shared secret key

Throws:

NullPointerException - if psk or psk_id are null

InvalidKeyException - if recipientKey is null or an unsupported key format

UnsupportedOperationException - if mode is not a supported HPKE mode

IllegalStateException - if this HpkeContextSender has already been initialised

init

public void init(PublicKey recipientKey,
 byte[] info,
 PrivateKey senderKey,
 byte[] psk,
 byte[] psk_id)
          throws InvalidKeyException

Initialises this HpkeContextSender in PSK_AUTH mode, i.e. messages are authenticated using both the sender's public key and a pre-shared secret key.

Parameters:

recipientKey - public key of the recipient

info - additional application-supplied information, may be null or empty

senderKey - private key of the sender

psk - the a pre-shared secret key

psk_id - the id of the pre-shared secret key

Throws:

NullPointerException - if psk or psk_id are null

InvalidKeyException - if either recipientKey or senderKey are null or an unsupported key format

UnsupportedOperationException - if mode is not a supported HPKE mode

IllegalStateException - if this HpkeContextSender has already been initialised

initForTesting

@Internal
public void initForTesting(PublicKey recipientKey,
 byte[] info,
 byte[] sKe)
                    throws InvalidKeyException

Initialises this HpkeContextSender for testing in BASE mode ONLY.

Parameters:

recipientKey - public key of the recipient

info - additional application-supplied information, may be null or empty

sKe - random seed to use during testing

Throws:

InvalidKeyException - if recipientKey is null or an unsupported key format

UnsupportedOperationException - if mode is not a supported HPKE mode

IllegalStateException - if this HpkeContextSender has already been initialised

IllegalArgumentException - if sKe is null