spolavarpau1 commented on code in PR #612:
URL: https://github.com/apache/ranger/pull/612#discussion_r2216247249


##########
kms/src/main/java/org/apache/hadoop/crypto/key/RangerMasterKey.java:
##########
@@ -308,6 +308,13 @@ public boolean reencryptMKWithFipsAlgo(String mkPassword) {
                 init();
                 PBEKeySpec newPbeKeySpec = getPBEParameterSpec(mkPassword, 
encrCryptoAlgo);
                 byte[] masterKeyToDB = encryptKey(oldKeyMaterial, 
newPbeKeySpec);
+                byte[] decryptedMaterialWithNewAlgo = 
decryptKey(masterKeyToDB, newPbeKeySpec);
+                // This is just a sanity check but important to ensure that 
returned key material after re-encryption is same as old MK key material.
+                if 
(!Base64.encode(oldKeyMaterial).equals(Base64.encode(decryptedMaterialWithNewAlgo)))
 {

Review Comment:
   Should we also check for null for oldKeyMaterial & 
decryptMaterialWithNewAlgo?



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