70 lines
2.7 KiB
Kotlin
70 lines
2.7 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.key.generation
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import java.util.*
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import org.pgpainless.PGPainless
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import org.pgpainless.algorithm.*
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import org.pgpainless.key.generation.type.KeyType
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import org.pgpainless.signature.subpackets.SelfSignatureSubpackets
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import org.pgpainless.signature.subpackets.SignatureSubpackets
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import org.pgpainless.signature.subpackets.SignatureSubpacketsUtil
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class KeySpecBuilder
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constructor(
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private val type: KeyType,
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private val keyFlags: List<KeyFlag>,
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) : KeySpecBuilderInterface {
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private val hashedSubpackets: SelfSignatureSubpackets = SignatureSubpackets()
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private val algorithmSuite: AlgorithmSuite = PGPainless.getPolicy().keyGenerationAlgorithmSuite
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private var preferredCompressionAlgorithms: Set<CompressionAlgorithm> =
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algorithmSuite.compressionAlgorithms
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private var preferredHashAlgorithms: Set<HashAlgorithm> = algorithmSuite.hashAlgorithms
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private var preferredSymmetricAlgorithms: Set<SymmetricKeyAlgorithm> =
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algorithmSuite.symmetricKeyAlgorithms
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private var keyCreationDate = Date()
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constructor(type: KeyType, vararg keyFlags: KeyFlag) : this(type, listOf(*keyFlags))
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init {
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SignatureSubpacketsUtil.assureKeyCanCarryFlags(type, *keyFlags.toTypedArray())
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}
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override fun overridePreferredCompressionAlgorithms(
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vararg algorithms: CompressionAlgorithm
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): KeySpecBuilder = apply { this.preferredCompressionAlgorithms = algorithms.toSet() }
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override fun overridePreferredHashAlgorithms(vararg algorithms: HashAlgorithm): KeySpecBuilder =
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apply {
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this.preferredHashAlgorithms = algorithms.toSet()
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}
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override fun overridePreferredSymmetricKeyAlgorithms(
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vararg algorithms: SymmetricKeyAlgorithm
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): KeySpecBuilder = apply {
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require(!algorithms.contains(SymmetricKeyAlgorithm.NULL)) {
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"NULL (unencrypted) is an invalid symmetric key algorithm preference."
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}
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this.preferredSymmetricAlgorithms = algorithms.toSet()
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}
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override fun setKeyCreationDate(creationDate: Date): KeySpecBuilder = apply {
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this.keyCreationDate = creationDate
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}
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override fun build(): KeySpec {
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return hashedSubpackets
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.apply {
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setKeyFlags(keyFlags)
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setPreferredCompressionAlgorithms(preferredCompressionAlgorithms)
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setPreferredHashAlgorithms(preferredHashAlgorithms)
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setPreferredSymmetricKeyAlgorithms(preferredSymmetricAlgorithms)
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setFeatures(Feature.MODIFICATION_DETECTION)
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}
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.let { KeySpec(type, hashedSubpackets as SignatureSubpackets, false, keyCreationDate) }
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}
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}
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