diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/bn256/twist.go')
| -rw-r--r-- | vendor/golang.org/x/crypto/bn256/twist.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/vendor/golang.org/x/crypto/bn256/twist.go b/vendor/golang.org/x/crypto/bn256/twist.go index 4f8b3fe..056d80f 100644 --- a/vendor/golang.org/x/crypto/bn256/twist.go +++ b/vendor/golang.org/x/crypto/bn256/twist.go @@ -219,10 +219,19 @@ func (c *twistPoint) Mul(a *twistPoint, scalar *big.Int, pool *bnPool) *twistPoi return c } +// MakeAffine converts c to affine form and returns c. If c is ∞, then it sets +// c to 0 : 1 : 0. func (c *twistPoint) MakeAffine(pool *bnPool) *twistPoint { if c.z.IsOne() { return c } + if c.IsInfinity() { + c.x.SetZero() + c.y.SetOne() + c.z.SetZero() + c.t.SetZero() + return c + } zInv := newGFp2(pool).Invert(c.z, pool) t := newGFp2(pool).Mul(c.y, zInv, pool) |