This commit updates the ECDH and ECDHXOnly functions to utilize optimized windowed multiplication instead of constant-time multiplication. This change is justified as the secret key is already known, allowing for variable-time operations. Additionally, new .idea configuration files are added, including .gitignore, misc.xml, modules.xml, p256k1.mleku.dev.iml, and vcs.xml, to enhance project management and version control settings.
This commit updates the `EcmultConst` function to use a simple binary method for constant-time multiplication, addressing issues with the previous GLV implementation. Additionally, a new `glv.go` file is introduced, containing GLV endomorphism constants and functions, including `scalarSplitLambda` and `geMulLambda`. Comprehensive tests for these functions are added in `glv_test.go`, ensuring correctness and performance. The `boolToInt` helper function is also moved to `field.go`, and unnecessary code is removed from `scalar.go` to streamline the codebase.
This commit introduces a new `ecmultWindowedVar` function that implements optimized windowed multiplication for scalar multiplication, significantly improving performance during verification operations. The existing `Ecmult` function is updated to utilize this new implementation, converting points to affine coordinates for efficiency. Additionally, the `EcmultConst` function is retained for constant-time operations. The changes also include enhancements to the generator multiplication context, utilizing precomputed byte points for improved efficiency. Overall, these optimizations lead to a notable reduction in operation times for cryptographic computations.
This commit introduces two new files: `BENCHMARK_RESULTS.md` and `benchmark_results.txt`, which document the performance metrics of various cryptographic operations, including ECDSA signing, verification, and ECDH key exchange. The results provide insights into operation times, memory allocations, and comparisons with C implementations. Additionally, new test files for ECDSA and ECDH functionalities have been added, ensuring comprehensive coverage and validation of the implemented algorithms. This enhances the overall robustness and performance understanding of the secp256k1 implementation.
