| 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.XMSSMTKeyParams;import org.bouncycastle.pqc.asn1.XMSSMTPrivateKey;import org.bouncycastle.pqc.asn1.XMSSPrivateKey;import org.bouncycastle.pqc.crypto.xmss.BDSStateMap;import org.bouncycastle.pqc.crypto.xmss.XMSSMTParameters;import org.bouncycastle.pqc.crypto.xmss.XMSSMTPrivateKeyParameters;import org.bouncycastle.pqc.crypto.xmss.XMSSUtil;import org.bouncycastle.pqc.jcajce.interfaces.XMSSMTKey;import org.bouncycastle.util.Arrays;public class BCXMSSMTPrivateKey implements PrivateKey, XMSSMTKey{ private final ASN1ObjectIdentifier treeDigest; private final XMSSMTPrivateKeyParameters keyParams; public BCXMSSMTPrivateKey( ASN1ObjectIdentifier treeDigest, XMSSMTPrivateKeyParameters keyParams) { this.treeDigest = treeDigest; this.keyParams = keyParams; } public BCXMSSMTPrivateKey(PrivateKeyInfo keyInfo) throws IOException { XMSSMTKeyParams keyParams = XMSSMTKeyParams.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters()); this.treeDigest = keyParams.getTreeDigest().getAlgorithm(); XMSSPrivateKey xmssMtPrivateKey = XMSSPrivateKey.getInstance(keyInfo.parsePrivateKey()); try { XMSSMTPrivateKeyParameters.Builder keyBuilder = new XMSSMTPrivateKeyParameters .Builder(new XMSSMTParameters(keyParams.getHeight(), keyParams.getLayers(), DigestUtil.getDigest(treeDigest))) .withIndex(xmssMtPrivateKey.getIndex()) .withSecretKeySeed(xmssMtPrivateKey.getSecretKeySeed()) .withSecretKeyPRF(xmssMtPrivateKey.getSecretKeyPRF()) .withPublicSeed(xmssMtPrivateKey.getPublicSeed()) .withRoot(xmssMtPrivateKey.getRoot()); if (xmssMtPrivateKey.getBdsState() != null) { // BUG: CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') // keyBuilder.withBDSState((BDSStateMap)XMSSUtil.deserialize(xmssMtPrivateKey.getBdsState())); // FIXED: keyBuilder.withBDSState((BDSStateMap)XMSSUtil.deserialize(xmssMtPrivateKey.getBdsState(), BDSStateMap.class)); } this.keyParams = keyBuilder.build(); } catch (ClassNotFoundException e) { throw new IOException("ClassNotFoundException processing BDS state: " + e.getMessage()); } } public String getAlgorithm() { return "XMSSMT"; } public String getFormat() { return "PKCS#8"; } public byte[] getEncoded() { PrivateKeyInfo pki; try { AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(PQCObjectIdentifiers.xmss_mt, new XMSSMTKeyParams(keyParams.getParameters().getHeight(), keyParams.getParameters().getLayers(), new AlgorithmIdentifier(treeDigest))); pki = new PrivateKeyInfo(algorithmIdentifier, createKeyStructure()); return pki.getEncoded(); } catch (IOException e) { return null; } } CipherParameters getKeyParams() { return keyParams; } public boolean equals(Object o) { if (o == this) { return true; } if (o instanceof BCXMSSMTPrivateKey) { BCXMSSMTPrivateKey otherKey = (BCXMSSMTPrivateKey)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()); } private XMSSMTPrivateKey createKeyStructure() { byte[] keyData = keyParams.toByteArray(); int n = keyParams.getParameters().getDigestSize(); int totalHeight = keyParams.getParameters().getHeight(); int indexSize = (totalHeight + 7) / 8; 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 XMSSMTPrivateKey(index, secretKeySeed, secretKeyPRF, publicSeed, root, bdsStateBinary); } ASN1ObjectIdentifier getTreeDigestOID() { return treeDigest; } public int getHeight() { return keyParams.getParameters().getHeight(); } public int getLayers() { return keyParams.getParameters().getLayers(); } public String getTreeDigest() { return DigestUtil.getXMSSDigestName(treeDigest); }} |