Tom-256 curve from https://eprint.iacr.org/2021/1183.pdf

Parameters

SAGE

p = 0xffffffff0000000100000000000000017e72b42b30e7317793135661b1c4b117
K = GF(p)
a = K(0xffffffff0000000100000000000000017e72b42b30e7317793135661b1c4b114)
b = K(0xb441071b12f4a0366fb552f8e21ed4ac36b06aceeb354224863e60f20219fc56)
E = EllipticCurve(K, (a, b))
G = E(0x03, 0x5a6dd32df58708e64e97345cbe66600decd9d538a351bb3c30b4954925b1f02d)
E.set_order(0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff * 0x01)

PARI/GP

p = 0xffffffff0000000100000000000000017e72b42b30e7317793135661b1c4b117
a = Mod(0xffffffff0000000100000000000000017e72b42b30e7317793135661b1c4b114, p)
b = Mod(0xb441071b12f4a0366fb552f8e21ed4ac36b06aceeb354224863e60f20219fc56, p)
E = ellinit([a, b])
E[16][1] = 0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff * 0x01
G = [Mod(0x03, p), Mod(0x5a6dd32df58708e64e97345cbe66600decd9d538a351bb3c30b4954925b1f02d, p)]

JSON

{
  "name": "Tom-256",
  "desc": "Tom-256 curve from https://eprint.iacr.org/2021/1183.pdf",
  "form": "Weierstrass",
  "field": {
    "type": "Prime",
    "p": "0xffffffff0000000100000000000000017e72b42b30e7317793135661b1c4b117",
    "bits": 256
  },
  "params": {
    "a": {
      "raw": "0xffffffff0000000100000000000000017e72b42b30e7317793135661b1c4b114"
    },
    "b": {
      "raw": "0xb441071b12f4a0366fb552f8e21ed4ac36b06aceeb354224863e60f20219fc56"
    }
  },
  "generator": {
    "x": {
      "raw": "0x03"
    },
    "y": {
      "raw": "0x5a6dd32df58708e64e97345cbe66600decd9d538a351bb3c30b4954925b1f02d"
    }
  },
  "order": "0xffffffff00000001000000000000000000000000ffffffffffffffffffffffff",
  "cofactor": "0x01"
}