49 lines
1.0 KiB
Python
49 lines
1.0 KiB
Python
#!/usr/bin/env python3
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import matplotlib.pyplot as plt
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from Cryptotools.Groups.curve import Curve
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a = 3
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b = 8
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curve = Curve(a, b, Curve.WEIERSTRASS)
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x = curve.x
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curve.generatePoints()
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y = curve.y
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yn = curve.yn
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points = curve.getPoints()
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P = points[10]
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Q = points[55]
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R = points[247]
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#print(f"{P.x} {P.y}")
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#print(f"{Q.x} {Q.y}")
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# Make an addition
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Rp = curve.add(P, Q)
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#print(f"{Rp.x} {Rp.y}")
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#print(yn)
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#print(x)
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#print(y)
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plt.figure(figsize=(10, 6))
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plt.plot(x, y, color='b', label=f'$y^2 = x^3 + {a}x + {b}$')
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plt.plot(x, yn, color='b', )
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plt.plot(P.x, P.y, marker='o', color="red")
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plt.annotate('P', (P.x, P.y + 0.5))
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plt.plot(Q.x, Q.y, marker='o', color="red")
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plt.annotate('Q', (Q.x, Q.y + 0.5))
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plt.plot(R.x, R.y, marker='o', color="red")
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plt.annotate('R', (R.x - 0.2, R.y + 0.5))
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plt.plot(Rp.x, Rp.y, marker='o', color="red")
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plt.annotate('R\'', (Rp.x - 0.2, Rp.y + 0.5))
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plt.axline([P.x, P.y], [Q.x, Q.y], color="red")
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plt.axline([R.x, R.y], [Rp.x, Rp.y], linestyle="--", color="red")
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plt.legend()
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plt.show()
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