Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/17295#discussion_r107323552 --- Diff: core/src/main/scala/org/apache/spark/security/CryptoStreamUtils.scala --- @@ -48,12 +51,30 @@ private[spark] object CryptoStreamUtils extends Logging { os: OutputStream, sparkConf: SparkConf, key: Array[Byte]): OutputStream = { - val properties = toCryptoConf(sparkConf) - val iv = createInitializationVector(properties) + val params = new CryptoParams(key, sparkConf) + val iv = createInitializationVector(params.conf) os.write(iv) - val transformationStr = sparkConf.get(IO_CRYPTO_CIPHER_TRANSFORMATION) - new CryptoOutputStream(transformationStr, properties, os, - new SecretKeySpec(key, "AES"), new IvParameterSpec(iv)) + new CryptoOutputStream(params.transformation, params.conf, os, params.keySpec, + new IvParameterSpec(iv)) + } + + /** + * Wrap a `WritableByteChannel` for encryption. + */ + def createWritableChannel( + channel: WritableByteChannel, + sparkConf: SparkConf, + key: Array[Byte]): WritableByteChannel = { + val params = new CryptoParams(key, sparkConf) + val iv = createInitializationVector(params.conf) + val buf = ByteBuffer.wrap(iv) + while (buf.hasRemaining()) { --- End diff -- actually this logic is same with `CryptoHelperChannel`. Shall we create `CryptoHelperChannel` first and simply call `helper.write(buf)` here?
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