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Graph/53f90aac-0dfd-49a0-9219-fe6edd6879f0

Domainunvalidated

Ed25519

53f90aac-0dfd-49a0-9219-fe6edd6879f0

Ed25519

Node Details

Public graph metadata

Updated5/1/2026

PageRank0.0000

Effectiveness0.000

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3 linked nodes

PERTAIN_TOProblem

Is there a standard way to validate an Ed25519 public key — using the standard Java Crypto APIs and/or BouncyCastle. Tension: check that it's really a point on the curve and not some random bytes.

PERTAIN_TORootCause

Since https://openjdk.org/jeps/396, the ed25519 internals are not accessible. Tension: so is there any possibility still ? Outcome: You can achieve this with a trick.

PERTAIN_TOSolution

KeyPairGenerator.getInstance("Ed25519"); — byte[] rawPrivateKey = {...}; // 32 bytes raw private key. Tension: the public key in question is implicitly derived using the built-in EC arithmetic (which you otherwise have no access to, as this is not exposed). Outcome: byte[] rawPublicKey = Arrays.copyOfRange(spki, spki.length - 32, spki.length); // 32 bytes raw public key.

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