type Element struct {// contains filtered or unexported fields}

func (*Element)Absolute¶

func (v *Element) Absolute(u *Element) *Element

Absolute sets v to |u|, and returns v.

func (*Element)Add¶

func (v *Element) Add(a, b *Element) *Element

Add sets v = a + b, and returns v.

func (*Element)Bytes¶

func (v *Element) Bytes() []byte

Bytes returns the canonical 32-byte little-endian encoding of v.

func (*Element)Equal¶

func (v *Element) Equal(u *Element)int

Equal returns 1 if v and u are equal, and 0 otherwise.

func (*Element)Invert¶

func (v *Element) Invert(z *Element) *Element

Invert sets v = 1/z mod p, and returns v.

If z == 0, Invert returns v = 0.

func (*Element)IsNegative¶

func (v *Element) IsNegative()int

IsNegative returns 1 if v is negative, and 0 otherwise.

func (*Element)Mult32¶

func (v *Element) Mult32(x *Element, yuint32) *Element

Mult32 sets v = x * y, and returns v.

func (*Element)Multiply¶

func (v *Element) Multiply(x, y *Element) *Element

Multiply sets v = x * y, and returns v.

func (*Element)Negate¶

func (v *Element) Negate(a *Element) *Element

Negate sets v = -a, and returns v.

func (*Element)One¶

func (v *Element) One() *Element

One sets v = 1, and returns v.

func (*Element)Pow22523¶

func (v *Element) Pow22523(x *Element) *Element

Pow22523 set v = x^((p-5)/8), and returns v. (p-5)/8 is 2^252-3.

func (*Element)Select¶

func (v *Element) Select(a, b *Element, condint) *Element

Select sets v to a if cond == 1, and to b if cond == 0.

func (*Element)Set¶

func (v *Element) Set(a *Element) *Element

Set sets v = a, and returns v.

func (*Element)SetBytes¶

func (v *Element) SetBytes(x []byte) (*Element,error)

SetBytes sets v to x, where x is a 32-byte little-endian encoding. If x isnot of the right length, SetBytes returns nil and an error, and thereceiver is unchanged.

Consistent withRFC 7748, the most significant bit (the high bit of thelast byte) is ignored, and non-canonical values (2^255-19 through 2^255-1)are accepted. Note that this is laxer than specified byRFC 8032, butconsistent with most Ed25519 implementations.

func (*Element)SqrtRatio¶

func (r *Element) SqrtRatio(u, v *Element) (R *Element, wasSquareint)

SqrtRatio sets r to the non-negative square root of the ratio of u and v.

If u/v is square, SqrtRatio returns r and 1. If u/v is not square, SqrtRatiosets r according to Section 4.3 of draft-irtf-cfrg-ristretto255-decaf448-00,and returns r and 0.

func (*Element)Square¶

func (v *Element) Square(x *Element) *Element

Square sets v = x * x, and returns v.

func (*Element)Subtract¶

func (v *Element) Subtract(a, b *Element) *Element

Subtract sets v = a - b, and returns v.

func (*Element)Swap¶

func (v *Element) Swap(u *Element, condint)

Swap swaps v and u if cond == 1 or leaves them unchanged if cond == 0, and returns v.

func (*Element)Zero¶

func (v *Element) Zero() *Element

Zero sets v = 0, and returns v.