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Kotlin conversion: SignatureVerifier
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<!--
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SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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SPDX-License-Identifier: Apache-2.0
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-->
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# Signature Verification and Validation
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This package can be a bit overwhelming, hence this README file.
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Signature verification and validation in OpenPGP is a complex topic (see a
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[related blog post of mine](https://blog.jabberhead.tk/2021/04/03/why-signature-verification-in-openpgp-is-hard/)),
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therefore let me quickly outline some of its challenges for you:
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A signature is either valid or it is not.
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However, signature validity goes beyond merely checking the cryptographic correctness like BouncyCastle does.
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A signature that is correct can still be invalid, e.g. if it is past its expiry date
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or the key that issued the signature got revoked or is simply not a signing key in the first place.
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All the little criteria like "is not expired", "has a hashed signature creation time subpacket",
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"does not contain critical unknown notations/subpackets" and so forth
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are implemented in the SignatureValidator class. This class defines an abstract "verify()" method
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which is overwritten in a collection of anonymous subclasses which check for one or more such criteria.
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Whether a signature is cryptographically correct is checked in the SignatureVerifier class.
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This class draws on the SignatureValidator class to compose the subclass building blocks depending on
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the signature type to check if the signature fulfills formal criteria and further checks for
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cryptographic correctness.
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Lastly the CertificateValidator class not only verifies single signatures, but also verifies that
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the corresponding certificate (public key ring) is still valid.
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It checks if the signing subkey is properly bound to its primary key, that no key in the chain is
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revoked or expired and that the signing key is capable of signing in the first place.
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I hope this little guide helps you to get access to the package more quickly.
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Happy Hacking!
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@ -1,486 +0,0 @@
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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.signature.consumer;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Date;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.bouncycastle.openpgp.PGPUserAttributeSubpacketVector;
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import org.pgpainless.algorithm.SignatureType;
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import org.pgpainless.exception.SignatureValidationException;
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import org.pgpainless.implementation.ImplementationFactory;
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import org.pgpainless.policy.Policy;
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/**
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* Collection of static methods for signature verification.
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* Signature verification entails validation of certain criteria (see {@link SignatureValidator}), as well as
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* cryptographic verification of signature correctness.
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*/
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public final class SignatureVerifier {
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private SignatureVerifier() {
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}
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/**
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* Verify a signature (certification or revocation) over a user-id.
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*
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* @param userId user-id
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* @param signature certification signature
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* @param signingKey key that created the certification
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* @param keyWithUserId key carrying the user-id
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if signature verification is successful
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifySignatureOverUserId(String userId, PGPSignature signature, PGPPublicKey signingKey,
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PGPPublicKey keyWithUserId, Policy policy, Date referenceDate)
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throws SignatureValidationException {
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SignatureType type = SignatureType.valueOf(signature.getSignatureType());
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switch (type) {
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case GENERIC_CERTIFICATION:
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case NO_CERTIFICATION:
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case CASUAL_CERTIFICATION:
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case POSITIVE_CERTIFICATION:
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return verifyUserIdCertification(userId, signature, signingKey, keyWithUserId, policy, referenceDate);
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case CERTIFICATION_REVOCATION:
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return verifyUserIdRevocation(userId, signature, signingKey, keyWithUserId, policy, referenceDate);
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default:
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throw new SignatureValidationException("Signature is not a valid user-id certification/revocation signature: " + type);
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}
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}
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/**
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* Verify a certification self-signature over a user-id.
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*
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* @param userId user-id
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* @param signature certification signature
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* @param primaryKey primary key
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the self-signature is verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserIdCertification(String userId, PGPSignature signature, PGPPublicKey primaryKey,
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Policy policy, Date referenceDate)
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throws SignatureValidationException {
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return verifyUserIdCertification(userId, signature, primaryKey, primaryKey, policy, referenceDate);
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}
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/**
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* Verify a user-id certification.
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*
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* @param userId user-id
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* @param signature certification signature
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* @param signingKey key that created the certification
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* @param keyWithUserId primary key that carries the user-id
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if signature verification is successful
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserIdCertification(String userId, PGPSignature signature, PGPPublicKey signingKey,
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PGPPublicKey keyWithUserId, Policy policy, Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.wasPossiblyMadeByKey(signingKey).verify(signature);
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SignatureValidator.signatureIsCertification().verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(signingKey, policy).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.correctSignatureOverUserId(userId, keyWithUserId, signingKey).verify(signature);
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return true;
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}
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/**
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* Verify a user-id revocation self-signature.
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*
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* @param userId user-id
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* @param signature user-id revocation signature
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* @param primaryKey primary key
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the user-id revocation signature is successfully verified
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserIdRevocation(String userId, PGPSignature signature, PGPPublicKey primaryKey,
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Policy policy, Date referenceDate)
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throws SignatureValidationException {
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return verifyUserIdRevocation(userId, signature, primaryKey, primaryKey, policy, referenceDate);
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}
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/**
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* Verify a user-id revocation signature.
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*
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* @param userId user-id
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* @param signature revocation signature
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* @param signingKey key that created the revocation signature
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* @param keyWithUserId primary key carrying the user-id
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the user-id revocation signature is successfully verified
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserIdRevocation(String userId, PGPSignature signature, PGPPublicKey signingKey,
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PGPPublicKey keyWithUserId, Policy policy, Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.wasPossiblyMadeByKey(signingKey).verify(signature);
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SignatureValidator.signatureIsOfType(SignatureType.CERTIFICATION_REVOCATION).verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(signingKey, policy).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.correctSignatureOverUserId(userId, keyWithUserId, signingKey).verify(signature);
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return true;
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}
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/**
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* Verify a certification self-signature over a user-attributes packet.
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*
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* @param userAttributes user attributes
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* @param signature certification self-signature
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* @param primaryKey primary key that carries the user-attributes
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the signature can be verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserAttributesCertification(PGPUserAttributeSubpacketVector userAttributes,
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PGPSignature signature, PGPPublicKey primaryKey,
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Policy policy, Date referenceDate)
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throws SignatureValidationException {
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return verifyUserAttributesCertification(userAttributes, signature, primaryKey, primaryKey, policy,
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referenceDate);
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}
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/**
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* Verify a certification signature over a user-attributes packet.
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*
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* @param userAttributes user attributes
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* @param signature certification signature
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* @param signingKey key that created the user-attributes certification
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* @param keyWithUserAttributes key that carries the user-attributes certification
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the signature can be verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserAttributesCertification(PGPUserAttributeSubpacketVector userAttributes,
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PGPSignature signature, PGPPublicKey signingKey,
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PGPPublicKey keyWithUserAttributes, Policy policy,
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Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.wasPossiblyMadeByKey(signingKey).verify(signature);
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SignatureValidator.signatureIsCertification().verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(signingKey, policy).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.correctSignatureOverUserAttributes(userAttributes, keyWithUserAttributes, signingKey)
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.verify(signature);
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return true;
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}
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/**
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* Verify a user-attributes revocation self-signature.
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*
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* @param userAttributes user-attributes
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* @param signature user-attributes revocation signature
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* @param primaryKey primary key that carries the user-attributes
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the revocation signature can be verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserAttributesRevocation(PGPUserAttributeSubpacketVector userAttributes,
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PGPSignature signature, PGPPublicKey primaryKey,
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Policy policy, Date referenceDate)
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throws SignatureValidationException {
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return verifyUserAttributesRevocation(userAttributes, signature, primaryKey, primaryKey, policy, referenceDate);
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}
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/**
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* Verify a user-attributes revocation signature.
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*
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* @param userAttributes user-attributes
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* @param signature revocation signature
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* @param signingKey revocation key
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* @param keyWithUserAttributes key that carries the user-attributes
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the revocation signature can be verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyUserAttributesRevocation(PGPUserAttributeSubpacketVector userAttributes,
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PGPSignature signature, PGPPublicKey signingKey,
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PGPPublicKey keyWithUserAttributes, Policy policy,
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Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.wasPossiblyMadeByKey(signingKey).verify(signature);
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SignatureValidator.signatureIsOfType(SignatureType.CERTIFICATION_REVOCATION).verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(signingKey, policy).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.correctSignatureOverUserAttributes(userAttributes, keyWithUserAttributes, signingKey)
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.verify(signature);
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return true;
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}
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/**
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* Verify a subkey binding signature.
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*
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* @param signature binding signature
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* @param primaryKey primary key
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* @param subkey subkey
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the binding signature can be verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifySubkeyBindingSignature(PGPSignature signature, PGPPublicKey primaryKey,
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PGPPublicKey subkey, Policy policy, Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.signatureIsOfType(SignatureType.SUBKEY_BINDING).verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(primaryKey, policy).verify(signature);
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SignatureValidator.signatureDoesNotPredateSignee(subkey).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.hasValidPrimaryKeyBindingSignatureIfRequired(primaryKey, subkey, policy, referenceDate)
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.verify(signature);
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SignatureValidator.correctSubkeyBindingSignature(primaryKey, subkey).verify(signature);
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return true;
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}
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/**
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* Verify a subkey revocation signature.
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*
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* @param signature subkey revocation signature
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* @param primaryKey primary key
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* @param subkey subkey
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the subkey revocation signature can be verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifySubkeyBindingRevocation(PGPSignature signature, PGPPublicKey primaryKey,
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PGPPublicKey subkey, Policy policy, Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.signatureIsOfType(SignatureType.SUBKEY_REVOCATION).verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(primaryKey, policy).verify(signature);
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SignatureValidator.signatureDoesNotPredateSignee(subkey).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.correctSignatureOverKey(primaryKey, subkey).verify(signature);
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return true;
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}
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/**
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* Verify a direct-key self-signature.
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*
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* @param signature signature
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* @param primaryKey primary key
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if the signature can be verified successfully
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyDirectKeySignature(PGPSignature signature, PGPPublicKey primaryKey,
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Policy policy, Date referenceDate)
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throws SignatureValidationException {
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return verifyDirectKeySignature(signature, primaryKey, primaryKey, policy, referenceDate);
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}
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/**
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* Verify a direct-key signature.
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*
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* @param signature signature
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* @param signingKey signing key
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* @param signedKey signed key
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if signature verification is successful
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyDirectKeySignature(PGPSignature signature, PGPPublicKey signingKey,
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PGPPublicKey signedKey, Policy policy, Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.signatureIsOfType(SignatureType.DIRECT_KEY).verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(signingKey, policy).verify(signature);
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SignatureValidator.signatureDoesNotPredateSignee(signedKey).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.correctSignatureOverKey(signingKey, signedKey).verify(signature);
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return true;
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}
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/**
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* Verify a key revocation signature.
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*
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* @param signature signature
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* @param primaryKey primary key
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* @param policy policy
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* @param referenceDate reference date for signature verification
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* @return true if signature verification is successful
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*
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* @throws SignatureValidationException if signature verification fails for some reason
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*/
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public static boolean verifyKeyRevocationSignature(PGPSignature signature, PGPPublicKey primaryKey,
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Policy policy, Date referenceDate)
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throws SignatureValidationException {
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SignatureValidator.signatureIsOfType(SignatureType.KEY_REVOCATION).verify(signature);
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SignatureValidator.signatureStructureIsAcceptable(primaryKey, policy).verify(signature);
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SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
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SignatureValidator.correctSignatureOverKey(primaryKey, primaryKey).verify(signature);
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return true;
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}
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/**
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* Initialize a signature and verify it afterwards by updating it with the signed data.
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*
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* @param signature OpenPGP signature
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* @param signedData input stream containing the signed data
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* @param signingKey the key that created the signature
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* @param policy policy
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* @param referenceDate reference date of signature verification
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* @return true if the signature is successfully verified
|
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*
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* @throws SignatureValidationException if the signature verification fails for some reason
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*/
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public static boolean verifyUninitializedSignature(PGPSignature signature, InputStream signedData,
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PGPPublicKey signingKey, Policy policy, Date referenceDate)
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throws SignatureValidationException {
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initializeSignatureAndUpdateWithSignedData(signature, signedData, signingKey);
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return verifyInitializedSignature(signature, signingKey, policy, referenceDate);
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}
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/**
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* Initialize a signature and then update it with the signed data from the given {@link InputStream}.
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*
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* @param signature OpenPGP signature
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* @param signedData input stream containing signed data
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* @param signingKey key that created the signature
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*
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* @throws SignatureValidationException in case the signature cannot be verified for some reason
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*/
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public static void initializeSignatureAndUpdateWithSignedData(PGPSignature signature, InputStream signedData,
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PGPPublicKey signingKey)
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throws SignatureValidationException {
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try {
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signature.init(ImplementationFactory.getInstance().getPgpContentVerifierBuilderProvider(), signingKey);
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int read;
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byte[] buf = new byte[8192];
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byte lastByte = -1;
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while ((read = signedData.read(buf)) != -1) {
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// If we previously omitted a newline, but the stream is not yet empty, add it now
|
||||
if (lastByte == (byte) '\n') {
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||||
signature.update(lastByte);
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}
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||||
lastByte = buf[read - 1];
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||||
|
||||
if (lastByte == (byte) '\n') {
|
||||
// if last byte in buffer is newline, omit it for now
|
||||
signature.update(buf, 0, read - 1);
|
||||
} else {
|
||||
// otherwise, write buffer as usual
|
||||
signature.update(buf, 0, read);
|
||||
}
|
||||
}
|
||||
} catch (PGPException e) {
|
||||
throw new SignatureValidationException("Cannot init signature.", e);
|
||||
} catch (IOException e) {
|
||||
throw new SignatureValidationException("Cannot update signature.", e);
|
||||
}
|
||||
}
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|
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/**
|
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* Verify an initialized signature.
|
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* An initialized signature was already updated with the signed data.
|
||||
*
|
||||
* @param signature OpenPGP signature
|
||||
* @param signingKey key that created the signature
|
||||
* @param policy policy
|
||||
* @param referenceDate reference date for signature verification
|
||||
* @return true if signature is verified successfully
|
||||
*
|
||||
* @throws SignatureValidationException if signature verification fails for some reason
|
||||
*/
|
||||
public static boolean verifyInitializedSignature(PGPSignature signature, PGPPublicKey signingKey, Policy policy,
|
||||
Date referenceDate)
|
||||
throws SignatureValidationException {
|
||||
SignatureValidator.wasPossiblyMadeByKey(signingKey).verify(signature);
|
||||
SignatureValidator.signatureStructureIsAcceptable(signingKey, policy).verify(signature);
|
||||
SignatureValidator.signatureIsEffective(referenceDate).verify(signature);
|
||||
|
||||
try {
|
||||
if (!signature.verify()) {
|
||||
throw new SignatureValidationException("Signature is not correct.");
|
||||
}
|
||||
return true;
|
||||
} catch (PGPException e) {
|
||||
throw new SignatureValidationException("Could not verify signature correctness.", e);
|
||||
}
|
||||
}
|
||||
|
||||
public static boolean verifyOnePassSignature(PGPSignature signature, PGPPublicKey signingKey,
|
||||
OnePassSignatureCheck onePassSignature, Policy policy)
|
||||
throws SignatureValidationException {
|
||||
try {
|
||||
SignatureValidator.wasPossiblyMadeByKey(signingKey).verify(signature);
|
||||
SignatureValidator.signatureStructureIsAcceptable(signingKey, policy).verify(signature);
|
||||
SignatureValidator.signatureIsEffective().verify(signature);
|
||||
} catch (SignatureValidationException e) {
|
||||
throw new SignatureValidationException("Signature is not valid: " + e.getMessage(), e);
|
||||
}
|
||||
|
||||
try {
|
||||
if (onePassSignature.getSignature() == null) {
|
||||
throw new IllegalStateException("No comparison signature provided.");
|
||||
}
|
||||
if (!onePassSignature.getOnePassSignature().verify(signature)) {
|
||||
throw new SignatureValidationException("Bad signature of key " +
|
||||
Long.toHexString(signingKey.getKeyID()));
|
||||
}
|
||||
} catch (PGPException e) {
|
||||
throw new SignatureValidationException("Could not verify correctness of One-Pass-Signature: " +
|
||||
e.getMessage(), e);
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Verify a signature (certification or revocation) over a user-id.
|
||||
*
|
||||
* @param userId user-id
|
||||
* @param signature self-signature
|
||||
* @param primaryKey primary key that created the signature
|
||||
* @param policy policy
|
||||
* @param referenceDate reference date for signature verification
|
||||
* @return true if the signature is successfully verified
|
||||
*
|
||||
* @throws SignatureValidationException if signature verification fails for some reason
|
||||
*/
|
||||
public static boolean verifySignatureOverUserId(String userId, PGPSignature signature, PGPPublicKey primaryKey,
|
||||
Policy policy, Date referenceDate)
|
||||
throws SignatureValidationException {
|
||||
return verifySignatureOverUserId(userId, signature, primaryKey, primaryKey, policy, referenceDate);
|
||||
}
|
||||
}
|
||||
|
|
@ -1,8 +0,0 @@
|
|||
// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
|
||||
//
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
|
||||
/**
|
||||
* Classes related to OpenPGP signature verification.
|
||||
*/
|
||||
package org.pgpainless.signature.consumer;
|
||||
Loading…
Add table
Add a link
Reference in a new issue