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merkle tee with sha256?! #120

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cryptonian-base opened this issue Apr 19, 2019 · 1 comment

cryptonian-base commented Apr 19, 2019

I've been trying to make zkSNARK for merkle tree with sha256.

Merkle tree with mimc is given as an example in this repo but replacing mimc with sha256_full or sha256_many has been found not that easy task.

Anyone has tried the same thing? Any advice will be welcome :)

Owner

HarryR commented Apr 20, 2019

For merkle-tree with SHA256, see an example at:

https://github.com/barryWhiteHat/miximus/blob/master/src/main.cpp#L84

This uses the two gadgets from libsnark:

merkle_authentication_path_variable
merkle_tree_check_read_gadget

These can be used in-conjunction with the SHA256 gadgets from Ethsnarks to make hashes which are compatible with Ethereum.

https://github.com/HarryR/ethsnarks/blob/master/src/gadgets/sha256_many.cpp (takes arbitrary length input, does arbitrary padding)
https://github.com/HarryR/ethsnarks/blob/master/src/gadgets/sha256_full.hpp (only accepts a 512bit input)

An Ethereum-compatible solidity library for doing merkle tree with SHA256 is:

https://github.com/barryWhiteHat/miximus/blob/master/contracts/MerkelTree.sol

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