Class Ed25519Algorithm

java.lang.Object

zeroecho.core.CryptoAlgorithm

zeroecho.core.alg.AbstractCryptoAlgorithm

zeroecho.core.alg.ed25519.Ed25519Algorithm

public final class Ed25519Algorithm
extends AbstractCryptoAlgorithm

Ed25519 Digital Signature Algorithm

Implementation of the Edwards-curve Digital Signature Algorithm (Ed25519). This class integrates Ed25519 into the ZeroEcho cryptographic framework as an AbstractCryptoAlgorithm.

Ed25519 is a modern, high-security, high-performance signature scheme with fixed-size keys and signatures. It is resistant to a wide class of implementation pitfalls and side-channel attacks, making it a recommended choice for new protocols.

Capabilities

• KeyUsage.SIGN: Creates a SignatureContext bound to a PrivateKey. This context produces 64-byte Ed25519 signatures.
• KeyUsage.VERIFY: Creates a SignatureContext bound to a PublicKey. This context verifies 64-byte Ed25519 signatures.

Key material

• Generation via Ed25519KeyGenSpec and Ed25519KeyGenBuilder.
• Import of public keys via Ed25519PublicKeySpec and Ed25519PublicKeyBuilder.
• Import of private keys via Ed25519PrivateKeySpec and Ed25519PrivateKeyBuilder.

Thread-safety

This algorithm definition is immutable and safe to share across threads. The created SignatureContext instances are not guaranteed to be thread-safe.

Since:

1.0

Constructor Summary

Constructors

Constructor	Description
Ed25519Algorithm()	Constructs the Ed25519 algorithm definition and registers its roles and key builders.

Method Summary

Modifier and Type	Method	Description
List<ParameterSetDescriptor<? extends AlgorithmKeySpec>>	parameterSets()	Returns the discoverable parameter sets (or parameterized templates) supported by this algorithm.

Methods inherited from class AbstractCryptoAlgorithm

capability

Methods inherited from class CryptoAlgorithm

addCapability, asymmetricKeyPairGenerator, bindContext, createContext, displayName, id, keyOperations, listCapabilities, priority, privateKeyImporter, providerName, publicKeyImporter, registerAsymmetricKeyPairGenerator, registerPrivateKeyImporter, registerPublicKeyImporter, registerSymmetricKeyGenerator, registerSymmetricKeyImporter, requiresStatefulSigning, roles, supports, symmetricKeyGenerator, symmetricKeyImporter

Methods inherited from class Object

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

Constructor Details

Ed25519Algorithm

public Ed25519Algorithm()

Constructs the Ed25519 algorithm definition and registers its roles and key builders.

This includes:

• Binding SIGN (with PrivateKey) to Ed25519SignatureContext.
• Binding VERIFY (with PublicKey) to Ed25519SignatureContext.
• Registering key builders for generation and import of Ed25519 key material.

Method Details

parameterSets

public List<ParameterSetDescriptor<? extends AlgorithmKeySpec>> parameterSets()

Description copied from class: CryptoAlgorithm

Returns the discoverable parameter sets (or parameterized templates) supported by this algorithm.

Callers (UIs, provisioning tools, policy engines) use this list to present users with valid, named key-generation options without prior knowledge of the concrete algorithm. Each entry is either a pre-built ParameterSetDescriptor.Concrete (ready spec) or a ParameterSetDescriptor.Template (user-supplied arguments produce the spec).

The default implementation returns an empty list. Algorithms with finite, enumerable parameter sets should override this method. Overrides must return immutable lists in stable order, with unique nonblank descriptor identifiers. Registry loading validates a snapshot; external providers remain responsible for maintaining the contract on subsequent calls. Implementations may use ParameterSetDescriptor.snapshot(List) to validate and copy their list.

Overrides:

parameterSets in class CryptoAlgorithm

Returns:

immutable list of parameter set descriptors; never null