How can I decode a hash in sway on a contract?

Sway
1

I need help decoding an hash in sway… The fuel book only shows how to hash and not how to decode. Is that feature present?

2

Hashing some data is strictly a one-way function. There is mathematically no way to undo a hash or decode it. The original data must be provided to verify that a hash digest is correct.

However, one can recover the public key derived from the private key used to sign a message with the std::ecr::ec_recover() function in the Sway std-lib.

3

I was trying to implement a sway version of a solution that uses “abi.encode” and abi.decode()" in solidity. Do you mean this kind of operation is not possible with sway?

4

Ah you are referring to serialization and deserialization into bytes. This is something we have been working on for a while now and have made some significant progress recently. Progress on this can be tracked here: Serialization and encoding/decoding · Issue #4769 · FuelLabs/sway · GitHub

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