Package 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

@Immutable
public final class EcdsaPublicKey
extends SignaturePublicKey

EcdsaPublicKey represents the public portion of ECDSA signature primitive.

Nested Class Summary

Nested Classes

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

Method Summary

Modifier and Type	Method	Description
static EcdsaPublicKey.Builder	builder()
boolean	equalsKey(Key o)	Returns true if the key is guaranteed to be equal to other.
java.lang.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.
java.security.spec.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 java.security.spec.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 java.lang.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 guaranteed to be equal to other.

Implementations are required to do this in constant time.

Note: this is allowed to return false even if two keys are guaranteed to represent the same function, but are represented differently. For example, a key is allowed to internally store the number of zero-bytes used as padding when a large number is represented as a byte array, and use this in the comparison.

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