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Update BouncyCastle Ed25519 to X25519 key conversion shim

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catbref 2019-10-25 13:22:08 +01:00
parent 5798c69449
commit 843aad4930
1 changed files with 9 additions and 9 deletions
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18
src/main/java/org/qora/crypto/BouncyCastle25519.java
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@ -14,25 +14,25 @@ import org.bouncycastle.math.ec.rfc8032.Ed25519;
/** Additions to BouncyCastle providing Ed25519 to X25519 key conversion. */
public class BouncyCastle25519 {
private static final Class<?> pointExtClass;
private static final Constructor<?> pointExtCtor;
private static final Class<?> pointAffineClass;
private static final Constructor<?> pointAffineCtor;
private static final Method decodePointVarMethod;
private static final Field yField;
static {
try {
Class<?> ed25519Class = Ed25519.class;
pointExtClass = Arrays.stream(ed25519Class.getDeclaredClasses()).filter(clazz -> clazz.getSimpleName().equals("PointExt")).findFirst().get();
if (pointExtClass == null)
pointAffineClass = Arrays.stream(ed25519Class.getDeclaredClasses()).filter(clazz -> clazz.getSimpleName().equals("PointAffine")).findFirst().get();
if (pointAffineClass == null)
throw new ClassNotFoundException("Can't locate PointExt inner class inside Ed25519");
decodePointVarMethod = ed25519Class.getDeclaredMethod("decodePointVar", byte[].class, int.class, boolean.class, pointExtClass);
decodePointVarMethod = ed25519Class.getDeclaredMethod("decodePointVar", byte[].class, int.class, boolean.class, pointAffineClass);
decodePointVarMethod.setAccessible(true);
pointExtCtor = pointExtClass.getDeclaredConstructors()[0];
pointExtCtor.setAccessible(true);
pointAffineCtor = pointAffineClass.getDeclaredConstructors()[0];
pointAffineCtor.setAccessible(true);
yField = pointExtClass.getDeclaredField("y");
yField = pointAffineClass.getDeclaredField("y");
yField.setAccessible(true);
} catch (NoSuchMethodException | SecurityException | IllegalArgumentException | NoSuchFieldException | ClassNotFoundException e) {
throw new RuntimeException("Can't initialize BouncyCastle25519 shim", e);
@ -41,7 +41,7 @@ public class BouncyCastle25519 {
private static int[] obtainYFromPublicKey(byte[] ed25519PublicKey) {
try {
Object pA = pointExtCtor.newInstance();
Object pA = pointAffineCtor.newInstance();
Boolean result = (Boolean) decodePointVarMethod.invoke(null, ed25519PublicKey, 0, true, pA);
if (result == null || !result)