Kotlin conversion: DecryptionBuilder

pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/DecryptionBuilder.kt

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.decryption_verification
+
+import java.io.InputStream
+
+/**
+ * Builder class that takes an [InputStream] of ciphertext (or plaintext signed data)
+ * and combines it with a configured [ConsumerOptions] object to form a [DecryptionStream] which
+ * can be used to decrypt an OpenPGP message or verify signatures.
+ */
+class DecryptionBuilder: DecryptionBuilderInterface {
+
+    override fun onInputStream(inputStream: InputStream): DecryptionBuilderInterface.DecryptWith {
+        return DecryptWithImpl(inputStream)
+    }
+
+    class DecryptWithImpl(val inputStream: InputStream): DecryptionBuilderInterface.DecryptWith {
+
+        override fun withOptions(consumerOptions: ConsumerOptions): DecryptionStream {
+            return OpenPgpMessageInputStream.create(inputStream, consumerOptions)
+        }
+    }
+}

pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/DecryptionBuilderInterface.kt

@@ -0,0 +1,34 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.decryption_verification
+
+import org.bouncycastle.openpgp.PGPException
+import java.io.IOException
+import java.io.InputStream
+
+interface DecryptionBuilderInterface {
+
+    /**
+     * Create a [DecryptionStream] on an [InputStream] which contains the encrypted and/or signed data.
+     *
+     * @param inputStream encrypted and/or signed data.
+     * @return api handle
+     */
+    fun onInputStream(inputStream: InputStream): DecryptWith
+
+    interface DecryptWith {
+
+        /**
+         * Add options for decryption / signature verification, such as keys, passphrases etc.
+         *
+         * @param consumerOptions consumer options
+         * @return decryption stream
+         * @throws PGPException in case of an OpenPGP related error
+         * @throws IOException in case of an IO error
+         */
+        @Throws(PGPException::class, IOException::class)
+        fun withOptions(consumerOptions: ConsumerOptions): DecryptionStream
+    }
+}