Instructions for the [secp256r1 native program][np].
[np]: https://docs.solana.com/developing/runtime-facilities/programs#secp256r1-program
Note on Signature Malleability:
This precompile requires low-S values in signatures (s <= half_curve_order) to prevent signature malleability.
Signature malleability means that for a valid signature (r,s), (r, order-s) is also valid for the
same message and public key.
This property can be problematic for developers who assume each signature is unique. Without enforcing
low-S values, the same message and key can produce two different valid signatures, potentially breaking
replay protection schemes that rely on signature uniqueness.