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More static analysis tweaks.

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This commit is contained in:
Mike Hearn 2013-07-11 13:42:42 +02:00
parent 000d81d54f
commit 98219bdd1b
1 changed files with 3 additions and 2 deletions
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5
core/src/main/java/com/google/bitcoin/crypto/hd/HDKeyDerivation.java
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@ -114,8 +114,9 @@ public final class HDKeyDerivation {
BigInteger ilInt = HDUtils.toBigInteger(il);
assertLessThanN(ilInt, "Illegal derived key: I_L >= n");
byte[] keyBytes;
if (parent.hasPrivate()) {
BigInteger ki = parent.getPrivAsFieldElement().add(ilInt).mod(HDUtils.getEcParams().getN());
final BigInteger privAsFieldElement = parent.getPrivAsFieldElement();
if (privAsFieldElement != null) {
BigInteger ki = privAsFieldElement.add(ilInt).mod(HDUtils.getEcParams().getN());
assertNonZero(ki, "Illegal derived key: derived private key equals 0.");
keyBytes = ki.toByteArray();
} else {