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package org.bouncycastle.pqc.jcajce.provider.xmss;import java.io.IOException;import java.security.PrivateKey;import org.bouncycastle.asn1.ASN1ObjectIdentifier;import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;import org.bouncycastle.asn1.x509.AlgorithmIdentifier;import org.bouncycastle.crypto.CipherParameters;import org.bouncycastle.pqc.asn1.PQCObjectIdentifiers;import org.bouncycastle.pqc.asn1.XMSSKeyParams;import org.bouncycastle.pqc.asn1.XMSSPrivateKey;import org.bouncycastle.pqc.crypto.xmss.BDS;import org.bouncycastle.pqc.crypto.xmss.XMSSParameters;import org.bouncycastle.pqc.crypto.xmss.XMSSPrivateKeyParameters;import org.bouncycastle.pqc.crypto.xmss.XMSSUtil;import org.bouncycastle.pqc.jcajce.interfaces.XMSSKey;import org.bouncycastle.util.Arrays;public class BCXMSSPrivateKey implements PrivateKey, XMSSKey{ private final XMSSPrivateKeyParameters keyParams; private final ASN1ObjectIdentifier treeDigest; public BCXMSSPrivateKey( ASN1ObjectIdentifier treeDigest, XMSSPrivateKeyParameters keyParams) { this.treeDigest = treeDigest; this.keyParams = keyParams; } public BCXMSSPrivateKey(PrivateKeyInfo keyInfo) throws IOException { XMSSKeyParams keyParams = XMSSKeyParams.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters()); this.treeDigest = keyParams.getTreeDigest().getAlgorithm(); XMSSPrivateKey xmssPrivateKey = XMSSPrivateKey.getInstance(keyInfo.parsePrivateKey()); try { XMSSPrivateKeyParameters.Builder keyBuilder = new XMSSPrivateKeyParameters .Builder(new XMSSParameters(keyParams.getHeight(), DigestUtil.getDigest(treeDigest))) .withIndex(xmssPrivateKey.getIndex()) .withSecretKeySeed(xmssPrivateKey.getSecretKeySeed()) .withSecretKeyPRF(xmssPrivateKey.getSecretKeyPRF()) .withPublicSeed(xmssPrivateKey.getPublicSeed()) .withRoot(xmssPrivateKey.getRoot()); if (xmssPrivateKey.getBdsState() != null) { // BUG: CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') // keyBuilder.withBDSState((BDS)XMSSUtil.deserialize(xmssPrivateKey.getBdsState())); // FIXED: keyBuilder.withBDSState((BDS)XMSSUtil.deserialize(xmssPrivateKey.getBdsState(), BDS.class)); } this.keyParams = keyBuilder.build(); } catch (ClassNotFoundException e) { throw new IOException("ClassNotFoundException processing BDS state: " + e.getMessage()); } } public String getAlgorithm() { return "XMSS"; } public String getFormat() { return "PKCS#8"; } public byte[] getEncoded() { PrivateKeyInfo pki; try { AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PQCObjectIdentifiers.xmss, new XMSSKeyParams(keyParams.getParameters().getHeight(), new AlgorithmIdentifier(treeDigest))); pki = new PrivateKeyInfo(algorithmIdentifier, createKeyStructure()); return pki.getEncoded(); } catch (IOException e) { return null; } } public boolean equals(Object o) { if (o == this) { return true; } if (o instanceof BCXMSSPrivateKey) { BCXMSSPrivateKey otherKey = (BCXMSSPrivateKey)o; return treeDigest.equals(otherKey.treeDigest) && Arrays.areEqual(keyParams.toByteArray(), otherKey.keyParams.toByteArray()); } return false; } public int hashCode() { return treeDigest.hashCode() + 37 * Arrays.hashCode(keyParams.toByteArray()); } CipherParameters getKeyParams() { return keyParams; } private XMSSPrivateKey createKeyStructure() { byte[] keyData = keyParams.toByteArray(); int n = keyParams.getParameters().getDigestSize(); int totalHeight = keyParams.getParameters().getHeight(); int indexSize = 4; int secretKeySize = n; int secretKeyPRFSize = n; int publicSeedSize = n; int rootSize = n; int position = 0; int index = (int)XMSSUtil.bytesToXBigEndian(keyData, position, indexSize); if (!XMSSUtil.isIndexValid(totalHeight, index)) { throw new IllegalArgumentException("index out of bounds"); } position += indexSize; byte[] secretKeySeed = XMSSUtil.extractBytesAtOffset(keyData, position, secretKeySize); position += secretKeySize; byte[] secretKeyPRF = XMSSUtil.extractBytesAtOffset(keyData, position, secretKeyPRFSize); position += secretKeyPRFSize; byte[] publicSeed = XMSSUtil.extractBytesAtOffset(keyData, position, publicSeedSize); position += publicSeedSize; byte[] root = XMSSUtil.extractBytesAtOffset(keyData, position, rootSize); position += rootSize; /* import BDS state */ byte[] bdsStateBinary = XMSSUtil.extractBytesAtOffset(keyData, position, keyData.length - position); return new XMSSPrivateKey(index, secretKeySeed, secretKeyPRF, publicSeed, root, bdsStateBinary); } ASN1ObjectIdentifier getTreeDigestOID() { return treeDigest; } public int getHeight() { return keyParams.getParameters().getHeight(); } public String getTreeDigest() { return DigestUtil.getXMSSDigestName(treeDigest); }} |