com.jcraft.jsch

Interface ECDH

public interface ECDH

Usually not to be used by applications. An interface with the mathematical operations needed for the Elliptic Curve Diffie Hellman key exchanges. Might be implemented to provide optimized operations for some curve. Its implementation class name needs to be given to Jsch.setConfig("ecdh-sha2-nistp").}

Since:

0.1.52

Method Summary

Modifier and Type	Method and Description
byte[]	getQ() Retrieves the public key (i.e. an elliptic curve point) to be sent to the remote side.
byte[]	getSecret(byte[] r, byte[] s) calculates and returns the shared secret for this key exchange.
void	init(int size) Initializes this instance for key pairs of a specific size.
boolean	validate(byte[] r, byte[] s) Validates a public key (i.e. an elliptic curve point) sent by the remote side.

Method Detail

init

void init(int size)
   throws Exception

Initializes this instance for key pairs of a specific size.

Throws:

Exception

getSecret

byte[] getSecret(byte[] r,
                 byte[] s)
          throws Exception

calculates and returns the shared secret for this key exchange.

Parameters:

r - the x coordinate of the remote partner's point, encoded as a byte[].

s - the y coordinate of the remote partner's point, encoded as a byte[].

Returns:

the shared secret, in the form of a byte[].

Throws:

Exception - if anything goes wrong.

getQ

byte[] getQ()
     throws Exception

Retrieves the public key (i.e. an elliptic curve point) to be sent to the remote side.

Returns:

the point, encoded as a byte[].

Throws:

Exception - if anything goes wrong.

validate

boolean validate(byte[] r,
                 byte[] s)
          throws Exception

Validates a public key (i.e. an elliptic curve point) sent by the remote side.

Parameters:

r - the x coordinate of the point, encoded as a byte[].

s - the y coordinate of the point, encoded as a byte[].

Returns:

true if the given point is actually on the curve, false otherwise.

Throws:

Exception - if anything goes wrong.