Add Schnorr adaptor signatures module #299
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This commit adds the foundational configuration, building scripts, and an initial structure for the project.
This commit adds a nonce function that will be used by default for Schnorr adaptor signatures. This nonce function is similar to secp256k1_nonce_function_hardened with an extra argument for a compressed 33-byte adaptor point.
This commit adds the Schnorr adaptor signature APIs:
- adaptor_presign
Creates a pre-signature for a given message and adaptor point.
- adaptor_extract
Extracts the adaptor point from a pre-signature.
- adaptor_adapt
Adapts the pre-signature to produce a BIP-340 Schnorr signature.
- adaptor_extract_sec
Extracts the secret adaptor (discrete logarithm of adaptor point)
from a pre-signature and the corresponding BIP-340 signature.
This commit adds test coverage, modifying the ci.yml file, Valgrind constant time tests for secret data, API tests, nonce function tests, and test vectors from the spec.
This commit adds an example that implements the Multi-hop Locks protocol using the Schnorr adaptor signature APIs
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Overview
This PR adds support for Schnorr Adaptor signatures. It is based on the PR #268 by @ZhePang, rebased and updated to address all pending review comments. Test coverage has been improved.
Schnorr Adaptor Signatures
This implementation follows the Python specification and includes test vectors from the specification. Additionally, it provides an example that demonstrates the Multi-Hop Locks protocol using this Schnorr adaptor module.