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You're almost there, change this (in secp256k1BinaryExpansion):
To this:
And your second test case will pass (i.e. 0x45300f2b990d332c0ee0efd69f2c21c323d0e2d20e7bfa7b1970bbf169174c82 => (40766947848522619068424335498612406856128862642075168802372109289834906557916, 70486353993054234343658342414815626812704078223802622900411169732153437188990))
I haven't checked your code carefully though, so I wouldn't consider this "working" just yet.
Code:
if coef & 1:
resultX, resultY = addition(currentX, currentY, gx, gy, a, b, prime)
currentX, currentY = addition(currentX, currentY, gx, gy, a, b, prime)
resultX, resultY = addition(currentX, currentY, gx, gy, a, b, prime)
currentX, currentY = addition(currentX, currentY, gx, gy, a, b, prime)
To this:
Code:
if coef & 1:
resultX, resultY = addition(resultX, resultY, currentX, currentY, a, b, prime)
currentX, currentY = addition(currentX, currentY, currentX, currentY, a, b, prime)
resultX, resultY = addition(resultX, resultY, currentX, currentY, a, b, prime)
currentX, currentY = addition(currentX, currentY, currentX, currentY, a, b, prime)
And your second test case will pass (i.e. 0x45300f2b990d332c0ee0efd69f2c21c323d0e2d20e7bfa7b1970bbf169174c82 => (40766947848522619068424335498612406856128862642075168802372109289834906557916, 70486353993054234343658342414815626812704078223802622900411169732153437188990))
I haven't checked your code carefully though, so I wouldn't consider this "working" just yet.