575 lines
24 KiB
Kotlin
575 lines
24 KiB
Kotlin
// 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.signature.subpackets
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import openpgp.openPgpKeyId
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import org.bouncycastle.bcpg.sig.*
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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.PGPSignatureList
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import org.bouncycastle.openpgp.PGPSignatureSubpacketVector
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import org.pgpainless.algorithm.*
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import org.pgpainless.algorithm.KeyFlag.Companion.hasKeyFlag
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import org.pgpainless.algorithm.KeyFlag.Companion.toBitmask
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import org.pgpainless.key.OpenPgpFingerprint
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import org.pgpainless.key.OpenPgpV4Fingerprint
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import org.pgpainless.key.OpenPgpV5Fingerprint
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import org.pgpainless.key.OpenPgpV6Fingerprint
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import org.pgpainless.key.generation.type.KeyType
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import org.pgpainless.signature.SignatureUtils
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import java.util.*
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class SignatureSubpacketsUtil {
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companion object {
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/**
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* Return the issuer-fingerprint subpacket of the signature.
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* Since this packet is self-authenticating, we expect it to be in the unhashed area,
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* however as it cannot hurt we search for it in the hashed area first.
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*
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* @param signature signature
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* @return issuer fingerprint or null
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*/
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@JvmStatic
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fun getIssuerFingerprint(signature: PGPSignature): IssuerFingerprint? =
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hashedOrUnhashed(signature, SignatureSubpacket.issuerFingerprint)
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/**
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* Return the [IssuerFingerprint] subpacket of the signature into a [org.pgpainless.key.OpenPgpFingerprint].
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* If no v4, v5 or v6 issuer fingerprint is present in the signature, return null.
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*
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* @param signature signature
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* @return fingerprint of the issuer, or null
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*/
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@JvmStatic
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fun getIssuerFingerprintAsOpenPgpFingerprint(signature: PGPSignature): OpenPgpFingerprint? {
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val subpacket = getIssuerFingerprint(signature) ?: return null
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return when(subpacket.keyVersion) {
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4 -> OpenPgpV4Fingerprint(subpacket.fingerprint)
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5 -> OpenPgpV5Fingerprint(subpacket.fingerprint)
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6 -> OpenPgpV6Fingerprint(subpacket.fingerprint)
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else -> null
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}
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}
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@JvmStatic
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fun getIssuerKeyId(signature: PGPSignature): IssuerKeyID? =
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hashedOrUnhashed(signature, SignatureSubpacket.issuerKeyId)
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/**
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* Inspect the given signature's [IssuerKeyID] packet to determine the issuer key-id.
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* If no such packet is present, return null.
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*
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* @param signature signature
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* @return issuer key-id as {@link Long}
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*/
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@JvmStatic
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fun getIssuerKeyIdAsLong(signature: PGPSignature): Long? =
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getIssuerKeyId(signature)?.keyID
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/**
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* Return the revocation reason subpacket of the signature.
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* Since this packet is rather important for revocations, we only search for it in the
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* hashed area of the signature.
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*
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* @param signature signature
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* @return revocation reason
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*/
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@JvmStatic
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fun getRevocationReason(signature: PGPSignature): RevocationReason? =
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hashed(signature, SignatureSubpacket.revocationReason)
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/**
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* Return the signature creation time subpacket.
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* Since this packet is rather important, we only search for it in the hashed area
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* of the signature.
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*
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* @param signature signature
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* @return signature creation time subpacket
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*/
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@JvmStatic
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fun getSignatureCreationTime(signature: PGPSignature): SignatureCreationTime? =
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if (signature.version == 3) SignatureCreationTime(false, signature.creationTime)
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else hashed(signature, SignatureSubpacket.signatureCreationTime)
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/**
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* Return the signature expiration time subpacket of the signature.
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* Since this packet is rather important, we only search for it in the hashed area of the signature.
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*
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* @param signature signature
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* @return signature expiration time
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*/
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@JvmStatic
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fun getSignatureExpirationTime(signature: PGPSignature): SignatureExpirationTime? =
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hashed(signature, SignatureSubpacket.signatureExpirationTime)
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/**
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* Return the signatures' expiration time as a date.
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* The expiration date is computed by adding the expiration time to the signature creation date.
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* If the signature has no expiration time subpacket, or the expiration time is set to '0', this message returns null.
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*
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* @param signature signature
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* @return expiration time as date
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*/
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@JvmStatic
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fun getSignatureExpirationTimeAsDate(signature: PGPSignature): Date? =
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getSignatureExpirationTime(signature)?.let {
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SignatureUtils.datePlusSeconds(signature.creationTime, it.time)
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}
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/**
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* Return the key expiration time subpacket of this signature.
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* We only look for it in the hashed area of the signature.
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*
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* @param signature signature
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* @return key expiration time
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*/
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@JvmStatic
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fun getKeyExpirationTime(signature: PGPSignature): KeyExpirationTime? =
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hashed(signature, SignatureSubpacket.keyExpirationTime)
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/**
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* Return the signatures key-expiration time as a date.
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* The expiration date is computed by adding the signatures' key-expiration time to the signing keys
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* creation date.
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* If the signature does not have a key-expiration time subpacket, or its value is '0', this method returns null.
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*
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* @param signature self-signature carrying the key-expiration time subpacket
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* @param signingKey signature creation key
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* @return key expiration time as date
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*/
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@JvmStatic
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fun getKeyExpirationTimeAsDate(signature: PGPSignature, signingKey: PGPPublicKey): Date? =
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require(signature.keyID == signingKey.keyID) {
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"Provided key (${signingKey.keyID.openPgpKeyId()}) did not create the signature (${signature.keyID.openPgpKeyId()})"
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}.run {
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getKeyExpirationTime(signature)?.let {
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SignatureUtils.datePlusSeconds(signingKey.creationTime, it.time)
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}
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}
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/**
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* Calculate the duration in seconds until the key expires after creation.
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*
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* @param expirationTime new expiration date
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* @param creationTime key creation time
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* @return lifetime of the key in seconds
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*/
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@JvmStatic
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fun getKeyLifetimeInSeconds(creationTime: Date, expirationTime: Date?): Long =
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expirationTime?.let {
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require(creationTime <= it) {
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"Key MUST NOT expire before being created.\n" +
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"(creation: $creationTime, expiration: $it)"
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}.run {
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(it.time - creationTime.time) / 1000
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}
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} ?: 0 // 0 means "no expiration"
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/**
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* Return the revocable subpacket of this signature.
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* We only look for it in the hashed area of the signature.
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*
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* @param signature signature
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* @return revocable subpacket
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*/
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@JvmStatic
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fun getRevocable(signature: PGPSignature): Revocable? =
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hashed(signature, SignatureSubpacket.revocable)
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/**
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* Return the symmetric algorithm preferences from the signatures hashed area.
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*
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* @param signature signature
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* @return symm. algo. prefs
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*/
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@JvmStatic
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fun getPreferredSymmetricAlgorithms(signature: PGPSignature): PreferredAlgorithms? =
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hashed(signature, SignatureSubpacket.preferredSymmetricAlgorithms)
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/**
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* Return the preferred [SymmetricKeyAlgorithms][SymmetricKeyAlgorithm] as present in the signature.
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* If no preference is given with regard to symmetric encryption algorithms, return an empty set.
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*
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* In any case, the resulting set is ordered by occurrence.
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* @param signature signature
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* @return ordered set of symmetric key algorithm preferences
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*/
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@JvmStatic
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fun parsePreferredSymmetricKeyAlgorithms(signature: PGPSignature): Set<SymmetricKeyAlgorithm> =
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getPreferredSymmetricAlgorithms(signature)
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?.preferences
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?.map { SymmetricKeyAlgorithm.fromId(it) }
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?.filterNotNull()
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?.toSet() ?: setOf()
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/**
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* Return the hash algorithm preferences from the signatures hashed area.
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*
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* @param signature signature
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* @return hash algo prefs
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*/
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@JvmStatic
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fun getPreferredHashAlgorithms(signature: PGPSignature): PreferredAlgorithms? =
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hashed(signature, SignatureSubpacket.preferredHashAlgorithms)
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/**
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* Return the preferred [HashAlgorithms][HashAlgorithm] as present in the signature.
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* If no preference is given with regard to hash algorithms, return an empty set.
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*
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* In any case, the resulting set is ordered by occurrence.
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* @param signature signature
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* @return ordered set of hash algorithm preferences
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*/
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@JvmStatic
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fun parsePreferredHashAlgorithms(signature: PGPSignature): Set<HashAlgorithm> =
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getPreferredHashAlgorithms(signature)
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?.preferences
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?.map { HashAlgorithm.fromId(it) }
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?.filterNotNull()
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?.toSet() ?: setOf()
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/**
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* Return the compression algorithm preferences from the signatures hashed area.
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*
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* @param signature signature
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* @return compression algo prefs
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*/
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@JvmStatic
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fun getPreferredCompressionAlgorithms(signature: PGPSignature): PreferredAlgorithms? =
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hashed(signature, SignatureSubpacket.preferredCompressionAlgorithms)
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/**
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* Return the preferred [CompressionAlgorithms][CompressionAlgorithm] as present in the signature.
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* If no preference is given with regard to compression algorithms, return an empty set.
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*
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* In any case, the resulting set is ordered by occurrence.
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* @param signature signature
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* @return ordered set of compression algorithm preferences
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*/
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@JvmStatic
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fun parsePreferredCompressionAlgorithms(signature: PGPSignature): Set<CompressionAlgorithm> =
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getPreferredCompressionAlgorithms(signature)
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?.preferences
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?.map { CompressionAlgorithm.fromId(it) }
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?.filterNotNull()
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?.toSet() ?: setOf()
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@JvmStatic
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fun getPreferredAeadAlgorithms(signature: PGPSignature): PreferredAEADCiphersuites? =
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hashed(signature, SignatureSubpacket.preferredAEADAlgorithms)
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/**
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* Return the primary user-id subpacket from the signatures hashed area.
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*
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* @param signature signature
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* @return primary user id
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*/
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@JvmStatic
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fun getPrimaryUserId(signature: PGPSignature): PrimaryUserID? =
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hashed(signature, SignatureSubpacket.primaryUserId)
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/**
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* Return the key flags subpacket from the signatures hashed area.
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*
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* @param signature signature
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* @return key flags
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*/
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@JvmStatic
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fun getKeyFlags(signature: PGPSignature): KeyFlags? =
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hashed(signature, SignatureSubpacket.keyFlags)
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/**
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* Return a list of key flags carried by the signature.
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* If the signature is null, or has no [KeyFlags] subpacket, return null.
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*
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* @param signature signature
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* @return list of key flags
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*/
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@JvmStatic
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fun parseKeyFlags(signature: PGPSignature?): List<KeyFlag>? =
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signature?.let { sig ->
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getKeyFlags(sig)?.let {
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KeyFlag.fromBitmask(it.flags)
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}
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}
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/**
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* Return the features subpacket from the signatures hashed area.
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*
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* @param signature signature
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* @return features subpacket
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*/
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@JvmStatic
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fun getFeatures(signature: PGPSignature): Features? =
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hashed(signature, SignatureSubpacket.features)
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/**
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* Parse out the features subpacket of a signature.
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* If the signature has no features subpacket, return null.
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* Otherwise, return the features as a feature set.
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*
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* @param signature signature
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* @return features as set
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*/
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@JvmStatic
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fun parseFeatures(signature: PGPSignature): Set<Feature>? =
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getFeatures(signature)?.let {
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Feature.fromBitmask(it.features.toInt()).toSet()
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}
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/**
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* Return the signature target subpacket from the signature.
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* We search for this subpacket in the hashed and unhashed area (in this order).
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*
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* @param signature signature
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* @return signature target
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*/
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@JvmStatic
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fun getSignatureTarget(signature: PGPSignature): SignatureTarget? =
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hashedOrUnhashed(signature, SignatureSubpacket.signatureTarget)
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/**
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* Return the notation data subpackets from the signatures hashed area.
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*
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* @param signature signature
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* @return hashed notations
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*/
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@JvmStatic
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fun getHashedNotationData(signature: PGPSignature): List<NotationData> =
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signature.hashedSubPackets.notationDataOccurrences.toList()
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/**
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* Return a list of all [NotationData] objects from the hashed area of the signature that have a
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* notation name equal to the given notationName argument.
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*
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* @param signature signature
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* @param notationName notation name
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* @return list of matching notation data objects
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*/
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@JvmStatic
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fun getHashedNotationData(signature: PGPSignature, notationName: String): List<NotationData> =
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getHashedNotationData(signature)
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.filter { it.notationName == notationName }
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/**
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* Return the notation data subpackets from the signatures unhashed area.
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*
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* @param signature signature
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* @return unhashed notations
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*/
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@JvmStatic
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fun getUnhashedNotationData(signature: PGPSignature): List<NotationData> =
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signature.unhashedSubPackets.notationDataOccurrences.toList()
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/**
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* Return a list of all [NotationData] objects from the unhashed area of the signature that have a
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* notation name equal to the given notationName argument.
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*
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* @param signature signature
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* @param notationName notation name
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* @return list of matching notation data objects
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*/
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@JvmStatic
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fun getUnhashedNotationData(signature: PGPSignature, notationName: String) =
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getUnhashedNotationData(signature)
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.filter { it.notationName == notationName }
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/**
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* Return the revocation key subpacket from the signatures hashed area.
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*
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* @param signature signature
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* @return revocation key
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*/
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@JvmStatic
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fun getRevocationKey(signature: PGPSignature): RevocationKey? =
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hashed(signature, SignatureSubpacket.revocationKey)
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/**
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* Return the signers user-id from the hashed area of the signature.
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* TODO: Can this subpacket also be found in the unhashed area?
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*
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* @param signature signature
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* @return signers user-id
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*/
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@JvmStatic
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fun getSignerUserID(signature: PGPSignature): SignerUserID? =
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hashed(signature, SignatureSubpacket.signerUserId)
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/**
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* Return the intended recipients fingerprint subpackets from the hashed area of this signature.
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*
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* @param signature signature
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* @return intended recipient fingerprint subpackets
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*/
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@JvmStatic
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fun getIntendedRecipientFingerprints(signature: PGPSignature): List<IntendedRecipientFingerprint> =
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signature.hashedSubPackets.intendedRecipientFingerprints.toList()
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/**
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* Return the embedded signature subpacket from the signatures hashed area or unhashed area.
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*
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* @param signature signature
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* @return embedded signature
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*/
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@JvmStatic
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fun getEmbeddedSignature(signature: PGPSignature): PGPSignatureList =
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signature.hashedSubPackets.embeddedSignatures.let {
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if (it.isEmpty) signature.unhashedSubPackets.embeddedSignatures
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else it
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}
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/**
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* Return the signatures exportable certification subpacket from the hashed area.
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*
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* @param signature signature
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* @return exportable certification subpacket
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*/
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@JvmStatic
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fun getExportableCertification(signature: PGPSignature): Exportable? =
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hashed(signature, SignatureSubpacket.exportableCertification)
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/**
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* Return true, if the signature is not explicitly marked as non-exportable.
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*/
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@JvmStatic
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fun isExportable(signature: PGPSignature): Boolean =
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getExportableCertification(signature)?.isExportable ?: true
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/**
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* Return the trust signature packet from the signatures hashed area.
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*
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* @param signature signature
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* @return trust signature subpacket
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*/
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@JvmStatic
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fun getTrustSignature(signature: PGPSignature): TrustSignature? =
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hashed(signature, SignatureSubpacket.trustSignature)
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/**
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* Return the trust depth set in the signatures [TrustSignature] packet, or [defaultDepth] if no such packet
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* is found.
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*
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* @param signature signature
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* @param defaultDepth default value that is returned if no trust signature packet is found
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* @return depth or default depth
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*/
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@JvmStatic
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fun getTrustDepthOr(signature: PGPSignature, defaultDepth: Int): Int =
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getTrustSignature(signature)?.depth ?: defaultDepth
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/**
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* Return the trust amount set in the signatures [TrustSignature] packet, or [defaultAmount] if no such packet
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* is found.
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*
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* @param signature signature
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* @param defaultAmount default value that is returned if no trust signature packet is found
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* @return amount or default amount
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*/
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@JvmStatic
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fun getTrustAmountOr(signature: PGPSignature, defaultAmount: Int): Int =
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getTrustSignature(signature)?.trustAmount ?: defaultAmount
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/**
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* Return all regular expression subpackets from the hashed area of the given signature.
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*
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* @param signature signature
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* @return list of regular expressions
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*/
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@JvmStatic
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fun getRegularExpressions(signature: PGPSignature): List<RegularExpression> =
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signature.hashedSubPackets.regularExpressions.toList()
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/**
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* Select a list of all signature subpackets of the given type, which are present in either the hashed
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* or the unhashed area of the given signature.
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*
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* @param signature signature
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* @param type subpacket type
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* @param <P> generic subpacket type
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* @return list of subpackets from the hashed/unhashed area
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*/
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@JvmStatic
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fun <P : org.bouncycastle.bcpg.SignatureSubpacket> hashedOrUnhashed(signature: PGPSignature, type: SignatureSubpacket): P? {
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return hashed(signature, type) ?: unhashed(signature, type)
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}
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/**
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* Select a list of all signature subpackets of the given type, which are present in the hashed area of
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* the given signature.
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*
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* @param signature signature
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* @param type subpacket type
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* @param <P> generic subpacket type
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* @return list of subpackets from the hashed area
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*/
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@JvmStatic
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fun <P : org.bouncycastle.bcpg.SignatureSubpacket> hashed(signature: PGPSignature, type: SignatureSubpacket): P? {
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return getSignatureSubpacket(signature.hashedSubPackets, type)
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}
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/**
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* Select a list of all signature subpackets of the given type, which are present in the unhashed area of
|
|
* the given signature.
|
|
*
|
|
* @param signature signature
|
|
* @param type subpacket type
|
|
* @param <P> generic subpacket type
|
|
* @return list of subpackets from the unhashed area
|
|
*/
|
|
@JvmStatic
|
|
fun <P : org.bouncycastle.bcpg.SignatureSubpacket> unhashed(signature: PGPSignature, type: SignatureSubpacket): P? {
|
|
return getSignatureSubpacket(signature.unhashedSubPackets, type)
|
|
}
|
|
|
|
/**
|
|
* Return the last occurrence of a subpacket type in the given signature subpacket vector.
|
|
*
|
|
* @param vector subpacket vector (hashed/unhashed)
|
|
* @param type subpacket type
|
|
* @param <P> generic return type of the subpacket
|
|
* @return last occurrence of the subpacket in the vector
|
|
*/
|
|
@JvmStatic
|
|
fun <P : org.bouncycastle.bcpg.SignatureSubpacket> getSignatureSubpacket(vector: PGPSignatureSubpacketVector?, type: SignatureSubpacket): P? {
|
|
val allPackets = vector?.getSubpackets(type.code) ?: return null
|
|
return if (allPackets.isEmpty())
|
|
null
|
|
else
|
|
@Suppress("UNCHECKED_CAST")
|
|
allPackets.last() as P
|
|
}
|
|
|
|
@JvmStatic
|
|
fun assureKeyCanCarryFlags(type: KeyType, vararg flags: KeyFlag) {
|
|
assureKeyCanCarryFlags(type.algorithm, *flags)
|
|
}
|
|
|
|
@JvmStatic
|
|
fun assureKeyCanCarryFlags(algorithm: PublicKeyAlgorithm, vararg flags: KeyFlag) {
|
|
val mask = toBitmask(*flags)
|
|
|
|
if (!algorithm.isSigningCapable() && hasKeyFlag(mask, KeyFlag.CERTIFY_OTHER)) {
|
|
throw IllegalArgumentException("Algorithm $algorithm cannot be used with key flag CERTIFY_OTHER.")
|
|
}
|
|
|
|
if (!algorithm.isSigningCapable() && hasKeyFlag(mask, KeyFlag.SIGN_DATA)) {
|
|
throw IllegalArgumentException("Algorithm $algorithm cannot be used with key flag SIGN_DATA.")
|
|
}
|
|
|
|
if (!algorithm.isEncryptionCapable() && hasKeyFlag(mask, KeyFlag.ENCRYPT_COMMS)) {
|
|
throw IllegalArgumentException("Algorithm $algorithm cannot be used with key flag ENCRYPT_COMMS.")
|
|
}
|
|
|
|
if (!algorithm.isEncryptionCapable() && hasKeyFlag(mask, KeyFlag.ENCRYPT_STORAGE)) {
|
|
throw IllegalArgumentException("Algorithm $algorithm cannot be used with key flag ENCRYPT_STORAGE.")
|
|
}
|
|
|
|
if (!algorithm.isSigningCapable() && hasKeyFlag(mask, KeyFlag.AUTHENTICATION)) {
|
|
throw IllegalArgumentException("Algorithm $algorithm cannot be used with key flag AUTHENTICATION.")
|
|
}
|
|
}
|
|
}
|
|
} |