U256 Secondary key does not match EOSIO SDK

[metallicusdev]

In EOSIO SDK, idx256 is stored differently than ascdk

example:

actual data stored using ascdk:
efbb5450f4528e0dd33ff1873f52a175 e8f280eb591c6725a1227b9aec8eac0e

to fetch from get_table_rows in ascdk contract, we have to instead use the key
75a1523f87f13fd30d8e52f45054bbef 0eac8eec9a7b22a125671c59eb80f2e8

[learnforpractice]

Fix by 143937c.
Keep in mind this is a breaking change.

[metallicusdev]

Is it necessary to change the packing / unpacking? The previous packed seems to be correct, just issue on the secondary index

[learnforpractice]

the checksum256 in C++ is in big endian, see fixed_bytes in libraries/eosiolib/core/eosio/fixed_bytes.hpp