Created
April 25, 2016 15:01
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| def invMod(x, p): | |
| return pow(x, p-2, p) | |
| def addECC(x1,y1,x2,y2,a,b,p): | |
| s = (invMod(x2-x1, p)*(y2-y1)) % p | |
| if ((x1 - x2) % p == 0) and ((y1-y2) % p == 0): | |
| s=(invMod(2*y1, p)*(3*x1*x1 + a)) % p | |
| x3 = (s*s -x1 -x2) %p | |
| y3 = (s*(x1-x3) -y1) % p | |
| return x3,y3 |
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