in scripts/ed25519-java/src/main/java/Ed25519TestCase.java [42:47]
private EdDSAPublicKey decodePublicKey() throws InvalidKeySpecException {
byte[] pk = Utils.hexToBytes(this.publicKeyHex);
byte[] x509pk = EncodingUtils.compressedEd25519PublicKeyToX509(pk);
X509EncodedKeySpec encoded = new X509EncodedKeySpec(x509pk);
return new EdDSAPublicKey(encoded);
}