如何将ECDSA曲线规范从SEC2格式转换为Go所需的格式？

I`m trying to implement ECDSA in the curve secp256k1 in Google Go.

Secp256k1 is defined by the SECG standard (SEC 2, part 2, Recommended Elliptic Curve Domain Parameters over

In the elliptic package of Go,

A Curve represents a short-form Weierstrass curve with a=-3.

So, we have curves of the form y² = x³ - 3·x + B (where both x and y take values in