com.jcraft.jsch

Interface SignatureECDSA

All Superinterfaces:

Signature

public interface SignatureECDSA
extends Signature

Usually not to be used by applications. A generic ECDSA signature algorithm, allowing signing (using a private key) or signature verification (using a public key). Each implementation works with one specific curve.

This interface is a slimmed down and specialized (on RSA) version of Signature.

It will be used by the library to check the server's signature during key exchange, and to prove our own possession of the private key for public-key authentication in the default Identity implementation.

The library will choose the implementation class by the configuration option signature.ecdsa, and instantiate it using the no-argument constructor. For signature checking, the usage would look like this:

  sig = class.newInstance();
  sig.init();
  sig.setPubKey(r, s);
  sig.update(H); // maybe more than once
  boolean ok = sig.verify(sig_of_H);

For signing, the usage would look like this:

  sig = class.newInstance();
  sig.init();
  sig.setPrvKey(prvKey);
  sig.update(H); // maybe more than once
  byte[] sig_of_H = sig.sign();

The library contains a default implementation based on Signature.

Since:

0.1.52

See Also:

SignatureDSA

Method Summary

Modifier and Type	Method and Description
void	setPrvKey(byte[] s) Sets the private key to be used for signing.
void	setPubKey(byte[] r, byte[] s) Sets the public key to be used for signature verification.

Methods inherited from interface com.jcraft.jsch.Signature

init, sign, update, verify

Method Detail

setPubKey

void setPubKey(byte[] r,
               byte[] s)
        throws Exception

Sets the public key to be used for signature verification.

Parameters:

r - the x-coordinate of the public key point.

s - the y-coordinate of the public key point.

Throws:

Exception - if something goes wrong.

setPrvKey

void setPrvKey(byte[] s)
        throws Exception

Sets the private key to be used for signing.

Parameters:

s - the private key (exponent), encoded as a byte[].

Throws:

Exception - if something goes wrong.