59 lines
2.3 KiB
Kotlin
59 lines
2.3 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.encryption_signing
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import org.pgpainless.PGPainless.Companion.getPolicy
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import org.pgpainless.algorithm.CompressionAlgorithm
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import org.pgpainless.algorithm.SymmetricKeyAlgorithm
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import org.pgpainless.algorithm.negotiation.SymmetricKeyAlgorithmNegotiator.Companion.byPopularity
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import org.slf4j.Logger
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import org.slf4j.LoggerFactory
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import java.io.OutputStream
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class EncryptionBuilder : EncryptionBuilderInterface {
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override fun onOutputStream(outputStream: OutputStream): EncryptionBuilderInterface.WithOptions {
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return WithOptionsImpl(outputStream)
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}
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class WithOptionsImpl(val outputStream: OutputStream) : EncryptionBuilderInterface.WithOptions {
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override fun withOptions(options: ProducerOptions): EncryptionStream {
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return EncryptionStream(outputStream, options)
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}
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}
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companion object {
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@JvmStatic
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val LOGGER: Logger = LoggerFactory.getLogger(EncryptionBuilder::class.java)
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/**
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* Negotiate the [SymmetricKeyAlgorithm] used for message encryption.
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*
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* @param encryptionOptions encryption options
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* @return negotiated symmetric key algorithm
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*/
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@JvmStatic
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fun negotiateSymmetricEncryptionAlgorithm(encryptionOptions: EncryptionOptions): SymmetricKeyAlgorithm {
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val preferences = encryptionOptions.keyViews.values
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.map { it.preferredSymmetricKeyAlgorithms }
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.toList()
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val algorithm = byPopularity().negotiate(
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getPolicy().symmetricKeyEncryptionAlgorithmPolicy,
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encryptionOptions.encryptionAlgorithmOverride,
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preferences)
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LOGGER.debug("Negotiation resulted in {} being the symmetric encryption algorithm of choice.", algorithm)
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return algorithm
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}
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@JvmStatic
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fun negotiateCompressionAlgorithm(producerOptions: ProducerOptions): CompressionAlgorithm {
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val compressionAlgorithmOverride = producerOptions.compressionAlgorithmOverride
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return compressionAlgorithmOverride ?: getPolicy().compressionAlgorithmPolicy.defaultCompressionAlgorithm()
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// TODO: Negotiation
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}
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}
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} |