Kotlin conversion: PublicKeyParameterValidationUtil
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// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.key.util;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.math.BigInteger;
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import java.security.SecureRandom;
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import org.bouncycastle.bcpg.BCPGKey;
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import org.bouncycastle.bcpg.DSAPublicBCPGKey;
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import org.bouncycastle.bcpg.DSASecretBCPGKey;
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import org.bouncycastle.bcpg.EdDSAPublicBCPGKey;
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import org.bouncycastle.bcpg.EdSecretBCPGKey;
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import org.bouncycastle.bcpg.ElGamalPublicBCPGKey;
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import org.bouncycastle.bcpg.ElGamalSecretBCPGKey;
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import org.bouncycastle.bcpg.RSAPublicBCPGKey;
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import org.bouncycastle.bcpg.RSASecretBCPGKey;
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import org.bouncycastle.openpgp.PGPEncryptedDataGenerator;
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import org.bouncycastle.openpgp.PGPEncryptedDataList;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPPrivateKey;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.bouncycastle.openpgp.PGPSignatureGenerator;
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import org.bouncycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
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import org.bouncycastle.util.Arrays;
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import org.bouncycastle.util.io.Streams;
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import org.pgpainless.algorithm.HashAlgorithm;
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import org.pgpainless.algorithm.PublicKeyAlgorithm;
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import org.pgpainless.algorithm.SignatureType;
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import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
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import org.pgpainless.exception.KeyIntegrityException;
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import org.pgpainless.implementation.ImplementationFactory;
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/**
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* Utility class to verify keys against Key Overwriting (KO) attacks.
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* This class of attacks is only possible if the attacker has access to the (encrypted) secret key material.
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* To execute the attack, they would modify the unauthenticated parameters of the users public key.
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* Using the modified public key in combination with the unmodified secret key material can then lead to the
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* extraction of secret key parameters via weakly crafted messages.
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*
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* @see <a href="https://www.kopenpgp.com/">Key Overwriting (KO) Attacks against OpenPGP</a>
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*/
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public class PublicKeyParameterValidationUtil {
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public static void verifyPublicKeyParameterIntegrity(PGPPrivateKey privateKey, PGPPublicKey publicKey)
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throws KeyIntegrityException {
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PublicKeyAlgorithm publicKeyAlgorithm = PublicKeyAlgorithm.requireFromId(publicKey.getAlgorithm());
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boolean valid = true;
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// Algorithm specific validations
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BCPGKey key = privateKey.getPrivateKeyDataPacket();
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if (key instanceof RSASecretBCPGKey) {
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valid = verifyRSAKeyIntegrity(
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(RSASecretBCPGKey) key,
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(RSAPublicBCPGKey) publicKey.getPublicKeyPacket().getKey())
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&& valid;
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} else if (key instanceof EdSecretBCPGKey) {
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valid = verifyEdDsaKeyIntegrity(
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(EdSecretBCPGKey) key,
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(EdDSAPublicBCPGKey) publicKey.getPublicKeyPacket().getKey())
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&& valid;
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} else if (key instanceof DSASecretBCPGKey) {
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valid = verifyDsaKeyIntegrity(
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(DSASecretBCPGKey) key,
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(DSAPublicBCPGKey) publicKey.getPublicKeyPacket().getKey())
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&& valid;
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} else if (key instanceof ElGamalSecretBCPGKey) {
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valid = verifyElGamalKeyIntegrity(
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(ElGamalSecretBCPGKey) key,
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(ElGamalPublicBCPGKey) publicKey.getPublicKeyPacket().getKey())
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&& valid;
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}
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if (!valid) {
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throw new KeyIntegrityException();
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}
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// Additional to the algorithm-specific tests further above, we also perform
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// generic functionality tests with the key, such as whether it is able to decrypt encrypted data
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// or verify signatures.
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// These tests should be more or less constant time.
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if (publicKeyAlgorithm.isSigningCapable()) {
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valid = verifyCanSign(privateKey, publicKey);
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}
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if (publicKeyAlgorithm.isEncryptionCapable()) {
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valid = verifyCanDecrypt(privateKey, publicKey) && valid;
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}
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if (!valid) {
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throw new KeyIntegrityException();
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}
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}
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/**
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* Verify that the public key can be used to successfully verify a signature made by the private key.
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* @param privateKey private key
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* @param publicKey public key
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* @return false if signature verification fails
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*/
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private static boolean verifyCanSign(PGPPrivateKey privateKey, PGPPublicKey publicKey) {
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SecureRandom random = new SecureRandom();
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PublicKeyAlgorithm publicKeyAlgorithm = PublicKeyAlgorithm.requireFromId(publicKey.getAlgorithm());
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PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(
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ImplementationFactory.getInstance().getPGPContentSignerBuilder(publicKeyAlgorithm, HashAlgorithm.SHA256)
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);
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try {
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signatureGenerator.init(SignatureType.TIMESTAMP.getCode(), privateKey);
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byte[] data = new byte[512];
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random.nextBytes(data);
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signatureGenerator.update(data);
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PGPSignature sig = signatureGenerator.generate();
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sig.init(ImplementationFactory.getInstance().getPgpContentVerifierBuilderProvider(), publicKey);
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sig.update(data);
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return sig.verify();
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} catch (PGPException e) {
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return false;
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}
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}
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/**
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* Verify that the public key can be used to encrypt a message which can successfully be
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* decrypted using the private key.
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* @param privateKey private key
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* @param publicKey public key
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* @return false if decryption of a message encrypted with the public key fails
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*/
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private static boolean verifyCanDecrypt(PGPPrivateKey privateKey, PGPPublicKey publicKey) {
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SecureRandom random = new SecureRandom();
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PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(
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ImplementationFactory.getInstance().getPGPDataEncryptorBuilder(SymmetricKeyAlgorithm.AES_256)
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);
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encryptedDataGenerator.addMethod(
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ImplementationFactory.getInstance().getPublicKeyKeyEncryptionMethodGenerator(publicKey));
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byte[] data = new byte[1024];
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random.nextBytes(data);
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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try {
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OutputStream outputStream = encryptedDataGenerator.open(out, new byte[1024]);
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outputStream.write(data);
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encryptedDataGenerator.close();
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PGPEncryptedDataList encryptedDataList = new PGPEncryptedDataList(out.toByteArray());
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PublicKeyDataDecryptorFactory decryptorFactory =
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ImplementationFactory.getInstance().getPublicKeyDataDecryptorFactory(privateKey);
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PGPPublicKeyEncryptedData encryptedData =
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(PGPPublicKeyEncryptedData) encryptedDataList.getEncryptedDataObjects().next();
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InputStream decrypted = encryptedData.getDataStream(decryptorFactory);
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out = new ByteArrayOutputStream();
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Streams.pipeAll(decrypted, out);
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decrypted.close();
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} catch (IOException | PGPException e) {
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return false;
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}
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return Arrays.constantTimeAreEqual(data, out.toByteArray());
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}
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private static boolean verifyEdDsaKeyIntegrity(EdSecretBCPGKey privateKey, EdDSAPublicBCPGKey publicKey)
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throws KeyIntegrityException {
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// TODO: Implement
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return true;
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}
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private static boolean verifyDsaKeyIntegrity(DSASecretBCPGKey privateKey, DSAPublicBCPGKey publicKey)
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throws KeyIntegrityException {
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// Not sure what value to put here in order to have a "robust" primality check
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// I went with 40, since that's what SO recommends:
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// https://stackoverflow.com/a/6330138
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final int certainty = 40;
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BigInteger pG = publicKey.getG();
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BigInteger pP = publicKey.getP();
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BigInteger pQ = publicKey.getQ();
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BigInteger pY = publicKey.getY();
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BigInteger sX = privateKey.getX();
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boolean pPrime = pP.isProbablePrime(certainty);
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if (!pPrime) {
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return false;
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}
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boolean qPrime = pQ.isProbablePrime(certainty);
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if (!qPrime) {
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return false;
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}
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// q > 160 bits
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boolean qLarge = pQ.bitLength() > 160;
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if (!qLarge) {
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return false;
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}
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// q divides p - 1
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boolean qDividesPminus1 = pP.subtract(BigInteger.ONE).mod(pQ).equals(BigInteger.ZERO);
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if (!qDividesPminus1) {
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return false;
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}
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// 1 < g < p
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boolean gInBounds = BigInteger.ONE.max(pG).equals(pG) && pG.max(pP).equals(pP);
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if (!gInBounds) {
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return false;
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}
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// g^q = 1 mod p
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boolean gPowXModPEquals1 = pG.modPow(pQ, pP).equals(BigInteger.ONE);
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if (!gPowXModPEquals1) {
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return false;
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}
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// y = g^x mod p
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boolean yEqualsGPowXModP = pY.equals(pG.modPow(sX, pP));
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if (!yEqualsGPowXModP) {
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return false;
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}
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return true;
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}
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private static boolean verifyRSAKeyIntegrity(RSASecretBCPGKey secretKey, RSAPublicBCPGKey publicKey)
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throws KeyIntegrityException {
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// Verify that the public keys N is equal to private keys p*q
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return publicKey.getModulus().equals(secretKey.getPrimeP().multiply(secretKey.getPrimeQ()));
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}
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/**
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* Validate ElGamal public key parameters.
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*
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* Original implementation by the openpgpjs authors:
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* <a href="https://github.com/openpgpjs/openpgpjs/blob/main/src/crypto/public_key/elgamal.js#L76-L143>OpenPGP.js source</a>
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* @param secretKey secret key
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* @param publicKey public key
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* @return true if supposedly valid, false if invalid
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*/
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private static boolean verifyElGamalKeyIntegrity(ElGamalSecretBCPGKey secretKey, ElGamalPublicBCPGKey publicKey) {
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BigInteger p = publicKey.getP();
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BigInteger g = publicKey.getG();
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BigInteger y = publicKey.getY();
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BigInteger one = BigInteger.ONE;
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// 1 < g < p
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if (g.min(one).equals(g) || g.max(p).equals(g)) {
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return false;
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}
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// p-1 is large
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if (p.bitLength() < 1023) {
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return false;
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}
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// g^(p-1) mod p = 1
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if (!g.modPow(p.subtract(one), p).equals(one)) {
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return false;
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}
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// check g^i mod p != 1 for i < threshold
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BigInteger res = g;
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// 262144
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int threshold = 2 << 17;
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int i = 1;
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while (i < threshold) {
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res = res.multiply(g).mod(p);
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if (res.equals(one)) {
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return false;
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}
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i++;
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}
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// blinded exponentiation to check y = g^(r*(p-1)+x) mod p
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SecureRandom random = new SecureRandom();
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BigInteger x = secretKey.getX();
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BigInteger r = new BigInteger(p.bitLength(), random);
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BigInteger rqx = p.subtract(one).multiply(r).add(x);
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if (!y.equals(g.modPow(rqx, p))) {
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return false;
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}
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return true;
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}
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}
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@ -0,0 +1,246 @@
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// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.key.util
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import org.bouncycastle.bcpg.*
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import org.bouncycastle.extensions.publicKeyAlgorithm
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import org.bouncycastle.openpgp.*
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import org.bouncycastle.util.Arrays
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import org.bouncycastle.util.io.Streams
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import org.pgpainless.algorithm.HashAlgorithm
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import org.pgpainless.algorithm.PublicKeyAlgorithm.Companion.requireFromId
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import org.pgpainless.algorithm.SignatureType
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import org.pgpainless.algorithm.SymmetricKeyAlgorithm
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import org.pgpainless.exception.KeyIntegrityException
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import org.pgpainless.implementation.ImplementationFactory.Companion.getInstance
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import java.io.ByteArrayOutputStream
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import java.io.IOException
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import java.math.BigInteger
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import java.security.SecureRandom
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/**
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* Utility class to verify keys against Key Overwriting (KO) attacks.
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* This class of attacks is only possible if the attacker has access to the (encrypted) secret key material.
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* To execute the attack, they would modify the unauthenticated parameters of the users public key.
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* Using the modified public key in combination with the unmodified secret key material can then lead to the
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* extraction of secret key parameters via weakly crafted messages.
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*
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* @see <a href="https://www.kopenpgp.com/">Key Overwriting (KO) Attacks against OpenPGP</a>
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*/
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class PublicKeyParameterValidationUtil {
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companion object {
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@JvmStatic
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@Throws(KeyIntegrityException::class)
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fun verifyPublicKeyParameterIntegrity(privateKey: PGPPrivateKey, publicKey: PGPPublicKey) {
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val algorithm = publicKey.publicKeyAlgorithm
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var valid = true
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val key = privateKey.privateKeyDataPacket
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when (privateKey.privateKeyDataPacket) {
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is RSASecretBCPGKey ->
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valid = verifyRSAKeyIntegrity(key as RSASecretBCPGKey, publicKey.publicKeyPacket.key as RSAPublicBCPGKey)
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is EdSecretBCPGKey ->
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valid = verifyEdDsaKeyIntegrity(key as EdSecretBCPGKey, publicKey.publicKeyPacket.key as EdDSAPublicBCPGKey)
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is DSASecretBCPGKey ->
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valid = verifyDsaKeyIntegrity(key as DSASecretBCPGKey, publicKey.publicKeyPacket.key as DSAPublicBCPGKey)
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is ElGamalSecretBCPGKey ->
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valid = verifyElGamalKeyIntegrity(key as ElGamalSecretBCPGKey, publicKey.publicKeyPacket.key as ElGamalPublicBCPGKey)
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}
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if (!valid) throw KeyIntegrityException()
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// Additional to the algorithm-specific tests further above, we also perform
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// generic functionality tests with the key, such as whether it is able to decrypt encrypted data
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// or verify signatures.
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// These tests should be more or less constant time.
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if (algorithm.isSigningCapable()) {
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valid = verifyCanSign(privateKey, publicKey)
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}
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if (algorithm.isEncryptionCapable()) {
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valid = valid and verifyCanDecrypt(privateKey, publicKey)
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}
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if (!valid) throw KeyIntegrityException()
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}
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@JvmStatic
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@Throws(KeyIntegrityException::class)
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private fun verifyRSAKeyIntegrity(secretKey: RSASecretBCPGKey, publicKey: RSAPublicBCPGKey): Boolean {
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// Verify that the public keys N is equal to private keys p*q
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return publicKey.modulus.equals(secretKey.primeP.multiply(secretKey.primeQ))
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}
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@JvmStatic
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@Throws(KeyIntegrityException::class)
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private fun verifyEdDsaKeyIntegrity(secretKey: EdSecretBCPGKey, publicKey: EdDSAPublicBCPGKey): Boolean {
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// TODO: Implement
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return true
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}
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@JvmStatic
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@Throws(KeyIntegrityException::class)
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private fun verifyDsaKeyIntegrity(privateKey: DSASecretBCPGKey, publicKey: DSAPublicBCPGKey): Boolean {
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// Not sure what value to put here in order to have a "robust" primality check
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// I went with 40, since that's what SO recommends:
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// https://stackoverflow.com/a/6330138
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val certainty = 40
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val pG = publicKey.g
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val pP = publicKey.p
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val pQ = publicKey.q
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val pY = publicKey.y
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val sX = privateKey.x
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val pPrime = pP.isProbablePrime(certainty)
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if (!pPrime) {
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return false
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}
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val qPrime = pQ.isProbablePrime(certainty)
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if (!qPrime) {
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return false
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}
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// q > 160 bits
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val qLarge = pQ.bitLength() > 160
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if (!qLarge) {
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return false
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}
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// q divides p - 1
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val qDividesPminus1 = pP.subtract(BigInteger.ONE).mod(pQ) == BigInteger.ZERO
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if (!qDividesPminus1) {
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return false
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}
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// 1 < g < p
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val gInBounds = BigInteger.ONE.max(pG) == pG && pG.max(pP) == pP
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if (!gInBounds) {
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return false
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}
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// g^q = 1 mod p
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val gPowXModPEquals1 = pG.modPow(pQ, pP) == BigInteger.ONE
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if (!gPowXModPEquals1) {
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return false
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}
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// y = g^x mod p
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return pY == pG.modPow(sX, pP)
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}
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/**
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* Validate ElGamal public key parameters.
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*
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* Original implementation by the openpgpjs authors:
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* <a href="https://github.com/openpgpjs/openpgpjs/blob/main/src/crypto/public_key/elgamal.js#L76-L143>OpenPGP.js source</a>
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* @param secretKey secret key
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* @param publicKey public key
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* @return true if supposedly valid, false if invalid
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*/
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@JvmStatic
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@Throws(KeyIntegrityException::class)
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private fun verifyElGamalKeyIntegrity(secretKey: ElGamalSecretBCPGKey, publicKey: ElGamalPublicBCPGKey): Boolean {
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val p = publicKey.p
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val g = publicKey.g
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val y = publicKey.y
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val one = BigInteger.ONE
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// 1 < g < p
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if (g.min(one) == g || g.max(p) == g) {
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return false
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}
|
||||
|
||||
// p-1 is large
|
||||
if (p.bitLength() < 1023) {
|
||||
return false
|
||||
}
|
||||
|
||||
// g^(p-1) mod p = 1
|
||||
if (g.modPow(p.subtract(one), p) != one) {
|
||||
return false
|
||||
}
|
||||
|
||||
// check g^i mod p != 1 for i < threshold
|
||||
var res = g
|
||||
// 262144
|
||||
val threshold = 2 shl 17
|
||||
var i = 1
|
||||
while (i < threshold) {
|
||||
res = res.multiply(g).mod(p)
|
||||
if (res == one) {
|
||||
return false
|
||||
}
|
||||
i++
|
||||
}
|
||||
|
||||
// blinded exponentiation to check y = g^(r*(p-1)+x) mod p
|
||||
val random = SecureRandom()
|
||||
val x = secretKey.x
|
||||
val r = BigInteger(p.bitLength(), random)
|
||||
val rqx = p.subtract(one).multiply(r).add(x)
|
||||
return y == g.modPow(rqx, p)
|
||||
}
|
||||
|
||||
/**
|
||||
* Verify that the public key can be used to successfully verify a signature made by the private key.
|
||||
* @param privateKey private key
|
||||
* @param publicKey public key
|
||||
* @return false if signature verification fails
|
||||
*/
|
||||
@JvmStatic
|
||||
private fun verifyCanSign(privateKey: PGPPrivateKey, publicKey: PGPPublicKey): Boolean {
|
||||
val data = ByteArray(512).also { SecureRandom().nextBytes(it) }
|
||||
val signatureGenerator = PGPSignatureGenerator(
|
||||
getInstance().getPGPContentSignerBuilder(requireFromId(publicKey.algorithm), HashAlgorithm.SHA256))
|
||||
return try {
|
||||
signatureGenerator.apply {
|
||||
init(SignatureType.TIMESTAMP.code, privateKey)
|
||||
update(data)
|
||||
}.generate().apply {
|
||||
init(getInstance().pgpContentVerifierBuilderProvider, publicKey)
|
||||
update(data)
|
||||
}.verify()
|
||||
} catch (e: PGPException) {
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Verify that the public key can be used to encrypt a message which can successfully be
|
||||
* decrypted using the private key.
|
||||
* @param privateKey private key
|
||||
* @param publicKey public key
|
||||
* @return false if decryption of a message encrypted with the public key fails
|
||||
*/
|
||||
@JvmStatic
|
||||
private fun verifyCanDecrypt(privateKey: PGPPrivateKey, publicKey: PGPPublicKey): Boolean {
|
||||
val data = ByteArray(1024).also { SecureRandom().nextBytes(it) }
|
||||
val encryptedDataGenerator = PGPEncryptedDataGenerator(
|
||||
getInstance().getPGPDataEncryptorBuilder(SymmetricKeyAlgorithm.AES_256)).apply {
|
||||
addMethod(getInstance().getPublicKeyKeyEncryptionMethodGenerator(publicKey))
|
||||
}
|
||||
|
||||
var out = ByteArrayOutputStream()
|
||||
try {
|
||||
val outputStream = encryptedDataGenerator.open(out, ByteArray(1024))
|
||||
outputStream.write(data)
|
||||
encryptedDataGenerator.close()
|
||||
val encryptedDataList = PGPEncryptedDataList(out.toByteArray())
|
||||
val decryptorFactory = getInstance().getPublicKeyDataDecryptorFactory(privateKey)
|
||||
val encryptedData = encryptedDataList.encryptedDataObjects.next() as PGPPublicKeyEncryptedData
|
||||
val decrypted = encryptedData.getDataStream(decryptorFactory)
|
||||
out = ByteArrayOutputStream()
|
||||
Streams.pipeAll(decrypted, out)
|
||||
decrypted.close()
|
||||
} catch (e: IOException) {
|
||||
return false
|
||||
} catch (e: PGPException) {
|
||||
return false
|
||||
}
|
||||
return Arrays.constantTimeAreEqual(data, out.toByteArray())
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue