com.google.crypto.tink.signature

Class EcdsaPublicKey

java.lang.Object

com.google.crypto.tink.Key

com.google.crypto.tink.signature.SignaturePublicKey

com.google.crypto.tink.signature.EcdsaPublicKey

@Alpha
 @Immutable
public final class EcdsaPublicKey
extends SignaturePublicKey

EcdsaPublicKey represents the public portion of ECDSA signature primitive.

This API is annotated with Alpha because it is not yet stable and might be changed in the future.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EcdsaPublicKey.Builder Builder for EcdsaPublicKey.

Method Summary

Modifier and Type	Method and Description
static EcdsaPublicKey.Builder	builder()
boolean	equalsKey(Key o) Returns true if the key is equal to the passed in key.
Integer	getIdRequirementOrNull() Returns null if this key has no id requirement, otherwise the required id.
Bytes	getOutputPrefix() Returns a Bytes instance which is prefixed to every signature.
EcdsaParameters	getParameters() Returns the parameters of this key.
ECPoint	getPublicPoint()

Methods inherited from class java.lang.Object

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

Method Detail

builder

public static EcdsaPublicKey.Builder builder()

getPublicPoint

public ECPoint getPublicPoint()

getOutputPrefix

public Bytes getOutputPrefix()

Description copied from class: SignaturePublicKey

Returns a Bytes instance which is prefixed to every signature.

Specified by:

getOutputPrefix in class SignaturePublicKey

getParameters

public EcdsaParameters getParameters()

Description copied from class: SignaturePublicKey

Returns the parameters of this key.

Specified by:

getParameters in class SignaturePublicKey

getIdRequirementOrNull

@Nullable
public Integer getIdRequirementOrNull()

Description copied from class: Key

Returns null if this key has no id requirement, otherwise the required id.

Some keys, when they are in a keyset, are required to have a certain ID to work properly. This comes from the fact that Tink in some cases prefixes ciphertexts or signatures with the string 0x01<id>, where the ID is encoded in big endian (see the documentation of the key type for details), in which case the key requires a certain ID.

Specified by:

getIdRequirementOrNull in class Key

equalsKey

public boolean equalsKey(Key o)

Description copied from class: Key

Returns true if the key is equal to the passed in key.

Implementations are required to do this in constant time.

Note: Tink Key objects should typically not override hashCode (because it could risk leaking key material). Hence, they typically also should not override equals.

Specified by:

equalsKey in class Key