Kotlin conversion: SignatureGenerationStream

pgpainless-core/src/main/kotlin/org/pgpainless/encryption_signing/SignatureGenerationStream.kt

@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.encryption_signing
+
+import java.io.OutputStream
+
+/**
+ * OutputStream which has the task of updating signature generators for written data.
+ */
+class SignatureGenerationStream(
+        private val wrapped: OutputStream,
+        private val options: SigningOptions?
+) : OutputStream() {
+
+    override fun close() = wrapped.close()
+    override fun flush() = wrapped.flush()
+
+    override fun write(b: Int) {
+        wrapped.write(b)
+        options?.run {
+            signingMethods.values.forEach {
+                it.signatureGenerator.update((b and 0xff).toByte())
+            }
+        }
+    }
+
+    override fun write(b: ByteArray) = write(b, 0, b.size)
+
+    override fun write(b: ByteArray, off: Int, len: Int) {
+        wrapped.write(b, off, len)
+        options?.run {
+            signingMethods.values.forEach {
+                it.signatureGenerator.update(b, off, len)
+            }
+        }
+    }
+}