Bouncy Castle Cryptography Library 1.80 · org.bouncycastle.openpgp.operator.bc.RFC6637KDFCalculator

Modifier and Type	Field and Description
private static final byte[]	ANONYMOUS_SENDER
private final PGPDigestCalculator	digCalc
private final int	keyAlgorithm

Access	Constructor and Description
public	RFC6637KDFCalculator(PGPDigestCalculator digCalc, int keyAlgorithm)

Method Summary

Modifier and Type	Method and Description
public byte[]	createKey(ECPoint s, byte[] userKeyingMaterial)
public byte[]	createKey(byte[] secret, byte[] userKeyingMaterial)
public static byte[]	Returns: The derived key for encryption. createKey(int The algorithm to use for key derivation, such as SHA256 or SHA512. algorithm, int The key algorithm identifier, representing AES-128 or AES-256. keyAlgorithm, byte[] The bytes to prepend before deriving the key, which should include: - 32/56 octets of the ephemeral X25519 or X448 public key - 32/56 octets of the recipient public key material - 32/56 octets of the shared secret prepend, String The info parameter used in the HKDF function. For X25519, use "OpenPGP X25519". For X448, use "OpenPGP X448". info) Creates a session key for X25519 or X448 encryption based on the provided algorithm and key algorithm.
private static int	getKeyLen(int algID)
private static byte[]	KDF(PGPDigestCalculator digCalc, byte[] ZB, int keyLen, byte[] param)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

ANONYMOUS_SENDER	back to summary
private static final byte[] ANONYMOUS_SENDER

digCalc	back to summary
private final PGPDigestCalculator digCalc

keyAlgorithm	back to summary
private final int keyAlgorithm

RFC6637KDFCalculator	back to summary
public RFC6637KDFCalculator(PGPDigestCalculator digCalc, int keyAlgorithm)

createKey	back to summary
public byte[] createKey(ECPoint s, byte[] userKeyingMaterial) throws PGPException

createKey	back to summary
public byte[] createKey(byte[] secret, byte[] userKeyingMaterial) throws PGPException

createKey	back to summary
public static byte[] createKey(int algorithm, int keyAlgorithm, byte[] prepend, String info) throws PGPException Creates a session key for X25519 or X448 encryption based on the provided algorithm and key algorithm. The method follows the specifications outlined in the OpenPGP standards, specifically sections 5.1.6 and 5.1.7 of rfc9580. Parameters algorithm:int The algorithm to use for key derivation, such as SHA256 or SHA512. keyAlgorithm:int The key algorithm identifier, representing AES-128 or AES-256. prepend:byte[] The bytes to prepend before deriving the key, which should include: - 32/56 octets of the ephemeral X25519 or X448 public key - 32/56 octets of the recipient public key material - 32/56 octets of the shared secret info:String The info parameter used in the HKDF function. For X25519, use "OpenPGP X25519". For X448, use "OpenPGP X448". Returns:byte[] The derived key for encryption. Exceptions PGPException: If an error occurs during key derivation. See Also rfc9580 - OpenPGP

createKey

public static byte[] createKey(int algorithm, int keyAlgorithm, byte[] prepend, String info) throws PGPException

Creates a session key for X25519 or X448 encryption based on the provided algorithm and key algorithm.

The method follows the specifications outlined in the OpenPGP standards, specifically sections 5.1.6 and 5.1.7 of rfc9580.

Parameters

algorithm:int: The algorithm to use for key derivation, such as SHA256 or SHA512.
keyAlgorithm:int: The key algorithm identifier, representing AES-128 or AES-256.
prepend:byte[]: The bytes to prepend before deriving the key, which should include: - 32/56 octets of the ephemeral X25519 or X448 public key - 32/56 octets of the recipient public key material - 32/56 octets of the shared secret
info:String: The info parameter used in the HKDF function. For X25519, use "OpenPGP X25519". For X448, use "OpenPGP X448".

Returns:byte[]

The derived key for encryption.

Exceptions

See Also

rfc9580 - OpenPGP

getKeyLen	back to summary
private static int getKeyLen(int algID) throws PGPException

KDF	back to summary
private static byte[] KDF(PGPDigestCalculator digCalc, byte[] ZB, int keyLen, byte[] param) throws IOException