eid3t1c / hash_extender Goto Github PK

Hello, I am trying to use the tool for hash extension.
Let's say my secret key is "key", the known message is "message".

The SHA256 of "keymessage" is 8ebbc3081b0700d1c226cafda9032a6a11224ed7367c5d59425e548ac4e70c0e

Now I want to extend it with the word "extend"
SHA256 of "keymessageextend" is 34da7d5df4ee5f042ebf19846e3b43325fda82d8c0381818fdc93ac0fdaafddd

Then I run: python Length_Extender.py -f SHA256 -s 8ebbc3081b0700d1c226cafda9032a6a11224ed7367c5d59425e548ac4e70c0e -d message -e extend -k
3

The tool output is "New Signature 8fd6775dc06d90221591613ec9329de7430f13b62d93d53c6e9885a53e62bbbd"

Doesn't took like a match with "keymessageextend" hash. What I'm doing wrong here?