Curve from https://eprint.iacr.org/2014/130.pdf. No generator present.

Parameters

SAGE

p = 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1f
K = GF(p)
a = K(0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1c)
b = K(0x879da)
E = EllipticCurve(K, (a, b))
# No generator defined
E.set_order(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8dbefa3f5ed9d839a2d4fe6ff516e87fa8d3e656a0f99fa1f0105f73b3b9d19f * 0x01)

PARI/GP

p = 0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1f
a = Mod(0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1c, p)
b = Mod(0x879da, p)
E = ellinit([a, b])
E[16][1] = 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8dbefa3f5ed9d839a2d4fe6ff516e87fa8d3e656a0f99fa1f0105f73b3b9d19f * 0x01
\\ No generator defined

JSON

{
  "name": "w-511-mers",
  "desc": "Curve from https://eprint.iacr.org/2014/130.pdf. No generator present.",
  "form": "Weierstrass",
  "field": {
    "type": "Prime",
    "p": "0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1f",
    "bits": 511
  },
  "params": {
    "a": {
      "raw": "0x7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe1c"
    },
    "b": {
      "raw": "0x879da"
    }
  },
  "order": "0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8dbefa3f5ed9d839a2d4fe6ff516e87fa8d3e656a0f99fa1f0105f73b3b9d19f",
  "cofactor": "0x01"
}