In contract, how to verify signature which is created by eosjs-ecc sign('xx', wif) method?

[86chenjie]

I want to use a 'user' table in contract to store register users.
User create a key pair with eosjs libaray. The wif is in client side.
Client use the wif to create a signature. Now in the contract, i need to verify this signature is valid, pubKey is stored in 'user' table.
After some digging, i didn't found related api. Can anyone help me?

Thanks in advance！

[86chenjie]

@XuNeal sorry to bring you here. I noticed your answer in EOSIO/eosjs-ecc#20.
so i think you probably know the answer to my question.

After some digging, i think this is the method to do verify, but i don't know how to use it in contract.
https://github.com/ElementsProject/secp256k1-zkp/blob/8de58308d883360023d9f03f7e29d6539366ca4f/src/java/org/bitcoin/NativeSecp256k1.java#L434

Thanks in advance.

[eosbet-io]

Yes, I am looking for something similar to this. Like ecrecover() in solidity, where a user can sign data and submit to contract, and the contract verifies that the data was signed correctly. Is there anything like this in EOS?

[andriantolie]

You can use either recover_key or assert_recover_key of the Crypto API (contracts/eosiolib/crypto.h)