Schnorr stuff is based on old secp256k1

[ysangkok]

As you can see from the PR, the schnorr bindings were made against the BIP340 spec as it was around March 2020. The spec and implementation were since changed, some symbols probably have different names, that's why you got linking errors. To make it work, you should diff the commit mentioned in the PR with the upstream secp256k1 that you want this library to target. Then you can know how to adjust the bindings.

[prolic]

Thank you very much @ysangkok
I will try to work further on this tomorrow.

[prolic]

@ysangkok I hope you can help me out a bit.

when running "stack test" I receive this output:

Linking .stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/spec/spec ...
/home/sasa/code/secp256k1-schnorr/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/libHSsecp256k1-schnorr-0.0.1-5vEVrcdlMg8E6qf3nbjOqc.a(Schnorr.o):function secp256k1zmschnorrzm0zi0zi1zm5vEVrcdlMg8E6qf3nbjOqc_CryptoziSchnorr_zdwverifyMsgSchnorr_info: error: undefined reference to 'secp256k1_schnorrsig_verify'
/home/sasa/code/secp256k1-schnorr/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/libHSsecp256k1-schnorr-0.0.1-5vEVrcdlMg8E6qf3nbjOqc.a(Schnorr.o):function secp256k1zmschnorrzm0zi0zi1zm5vEVrcdlMg8E6qf3nbjOqc_CryptoziSchnorr_zdwsignMsgSchnorr_info: error: undefined reference to 'secp256k1_schnorrsig_sign'
/home/sasa/code/secp256k1-schnorr/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/libHSsecp256k1-schnorr-0.0.1-5vEVrcdlMg8E6qf3nbjOqc.a(Schnorr.o):function secp256k1zmschnorrzm0zi0zi1zm5vEVrcdlMg8E6qf3nbjOqc_CryptoziSchnorr_zdwimportXOnlyPubKey_info: error: undefined reference to 'secp256k1_xonly_pubkey_parse'
/home/sasa/code/secp256k1-schnorr/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/libHSsecp256k1-schnorr-0.0.1-5vEVrcdlMg8E6qf3nbjOqc.a(Internal.o)(.text+0xa8f): error: undefined reference to 'secp256k1_schnorrsig_sign'
/home/sasa/code/secp256k1-schnorr/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/libHSsecp256k1-schnorr-0.0.1-5vEVrcdlMg8E6qf3nbjOqc.a(Internal.o)(.text+0xe39): error: undefined reference to 'secp256k1_xonly_pubkey_serialize'
/home/sasa/code/secp256k1-schnorr/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/libHSsecp256k1-schnorr-0.0.1-5vEVrcdlMg8E6qf3nbjOqc.a(Internal.o)(.text+0x10a7): error: undefined reference to 'secp256k1_schnorrsig_verify'
/home/sasa/code/secp256k1-schnorr/.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/libHSsecp256k1-schnorr-0.0.1-5vEVrcdlMg8E6qf3nbjOqc.a(Internal.o)(.text+0x12d9): error: undefined reference to 'secp256k1_xonly_pubkey_parse'
collect2: error: ld returned 1 exit status
`gcc' failed in phase `Linker'. (Exit code: 1)

However "stack build" works just fine.

the "tests" part of my package.yaml file is this:

tests:
  spec:
    main: Spec.hs
    source-dirs: test
    pkg-config-dependencies:
      - libsecp256k1
    ghc-options:
      - -threaded
      - -rtsopts
      - -with-rtsopts=-N
      - -lsecp256k1
    verbatim:
      build-tool-depends:
          hspec-discover:hspec-discover
    dependencies:
      - hspec
      - secp256k1-schnorr
      - mtl
      - HUnit
    extra-lib-dirs:
      - /usr/local/lib

As you can see, I added extra-lib-dirs (I compiled secp256k1 from source), however the linker doesn't seem to find it.

Any suggestions on how to solve this? Thanks in advance.

[prolic]

when compiling from source, you need to add the extra flags ./configure --enable-module-schnorrsig --enable-module-extrakeys --enable-module-ecdh --enable-experimental, then compiling works just fine.

[ysangkok]

Ensure that you don't have an old version of libsecp256k1 laying around. I don't wanna investigate more, since I don't work in cryptocurrency any more and I think it is already a disproportionate part of the Haskell ecosystem.

[prolic]

This is not for some cryptocurrency shitcoin. Anyway, thanks for your hints @ysangkok.