ggershinsky commented on a change in pull request #615:
URL: https://github.com/apache/parquet-mr/pull/615#discussion_r448263545
##########
File path:
parquet-hadoop/src/main/java/org/apache/parquet/crypto/keytools/KeyMaterial.java
##########
@@ -28,14 +28,35 @@
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;
+/**
+ * KeyMaterial class represents the "key material", keeping the information
that allows readers to recover an encryption key (see
+ * description of the KeyMetadata class). The keytools package (PARQUET-1373)
implements the "envelope encryption" pattern, in a
+ * "single wrapping" or "double wrapping" mode. In the single wrapping mode,
the key material is generated by encrypting the
+ * "data encryption key" (DEK) by a "master key". In the double wrapping mode,
the key material is generated by encrypting the DEK
+ * by a "key encryption key" (KEK), that in turn is encrypted by a "master
key".
+ *
+ * Key material is kept in a flat json object, with the following fields:
+ * 1. "keyMaterialType" - a String, with the type of key material. In the
current version, only one value is allowed - "PKMT1" (stands
+ * for "parquet key management tools, version 1"). For external key
material storage, this field is written in both "key metadata" and
+ * "key material" jsons. For internal key material storage, this field is
written only once in the common json.
+ * 2. "isFooterKey" - a boolean. If true, means that the material belongs to a
file footer key, and keeps additional information (such as
Review comment:
a good point, thanks for noticing this. will be fixed.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
