A faster Go (golang) secp256k1 library

This library is notable for its dual functionality; it operates with CGO when available and falls back to a pure Go implementation otherwise. The use of CGO allows the library to leverage the libsecp256k1 implementation, which significantly enhances performance. Specifically, tests have demonstrated that enabling CGO can reduce ECDSA and Schnorr signature verification times by at least 70%, which translates to a speed increase of approximately 350% as shown in the benchmarks.

In scenarios where CGO is unavailable or a C compiler is not present on the system, the library utilizes dcrec, an alternative secp256k1 implementation written entirely in Go and used by btcd. This approach ensures that the library remains portable and functional across different platforms and configurations. By setting the CGO_ENABLED=0 environment variable, developers can ensure consistent cross-compilation capabilities without the complications introduced by interfacing with C code.

This library represents a significant step forward in the development of cryptographic tools in Go, particularly for projects that prioritize portability and ease of cross-compilation. Feedback from other developers on this implementation would be highly valuable in refining and enhancing its functionality.