freenet.crypt

Class ECDSA

java.lang.Object

freenet.crypt.ECDSA

public class ECDSA
extends java.lang.Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ECDSA.Curves

Field Summary

Fields

Modifier and Type	Field and Description
ECDSA.Curves	curve

Constructor Summary

Constructors

Constructor and Description
ECDSA(ECDSA.Curves curve) Initialize the ECDSA object: this will draw some entropy
ECDSA(SimpleFieldSet sfs, ECDSA.Curves curve) Initialize the ECDSA object: from an SFS generated by asFieldSet()

Method Summary

Modifier and Type	Method and Description
SimpleFieldSet	asFieldSet(boolean includePrivate) Returns an SFS containing: - the private key - the public key - the name of the curve in use It should only be used in NodeCrypto
java.security.interfaces.ECPublicKey	getPublicKey()
static java.security.interfaces.ECPublicKey	getPublicKey(byte[] data, ECDSA.Curves curve) Returns an ECPublicKey from bytes obtained using ECPublicKey.getEncoded()
byte[]	sign(byte[]... data)
byte[]	signToNetworkFormat(byte[]... data) Sign data and return a fixed size signature.
boolean	verify(byte[] signature, byte[]... data)
boolean	verify(byte[] signature, int sigoffset, int siglen, byte[]... data)
static boolean	verify(ECDSA.Curves curve, java.security.interfaces.ECPublicKey key, byte[] signature, byte[]... data)
static boolean	verify(ECDSA.Curves curve, java.security.interfaces.ECPublicKey key, byte[] signature, int sigoffset, int siglen, byte[]... data)

Methods inherited from class java.lang.Object

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

Field Detail

curve

public final ECDSA.Curves curve

Constructor Detail

ECDSA

public ECDSA(ECDSA.Curves curve)

Initialize the ECDSA object: this will draw some entropy

Parameters:

curve -

ECDSA

public ECDSA(SimpleFieldSet sfs,
             ECDSA.Curves curve)
      throws FSParseException

Initialize the ECDSA object: from an SFS generated by asFieldSet()

Parameters:

curve -

Throws:

FSParseException

Method Detail

sign

public byte[] sign(byte[]... data)

signToNetworkFormat

public byte[] signToNetworkFormat(byte[]... data)

Sign data and return a fixed size signature. The data does not need to be hashed, the signing code will handle that for us, using an algorithm appropriate for the keysize.

Returns:

A zero padded DER signature (maxSigSize). Space Inefficient but constant-size.

verify

public boolean verify(byte[] signature,
                      byte[]... data)

verify

public boolean verify(byte[] signature,
                      int sigoffset,
                      int siglen,
                      byte[]... data)

verify

public static boolean verify(ECDSA.Curves curve,
                             java.security.interfaces.ECPublicKey key,
                             byte[] signature,
                             byte[]... data)

verify

public static boolean verify(ECDSA.Curves curve,
                             java.security.interfaces.ECPublicKey key,
                             byte[] signature,
                             int sigoffset,
                             int siglen,
                             byte[]... data)

getPublicKey

public java.security.interfaces.ECPublicKey getPublicKey()

getPublicKey

public static java.security.interfaces.ECPublicKey getPublicKey(byte[] data,
                                                                ECDSA.Curves curve)

Returns an ECPublicKey from bytes obtained using ECPublicKey.getEncoded()

Parameters:

data -

Returns:

ECPublicKey or null if it fails

asFieldSet

public SimpleFieldSet asFieldSet(boolean includePrivate)

Returns an SFS containing: - the private key - the public key - the name of the curve in use It should only be used in NodeCrypto

Parameters:

includePrivate - - include the (secret) private key

Returns:

SimpleFieldSet