Documentation
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Overview ¶
Package sm2c implements the SM2 Prime elliptic curves.
This package uses fiat-crypto or specialized assembly and Go code for its backend field arithmetic (not math/big) and exposes constant-time, heap allocation-free, byte slice-based safe APIs. Group operations use modern and safe complete addition formulas where possible. The point at infinity is handled and encoded according to SEC 1, Version 2.0, and invalid curve points can't be represented.
Index ¶
- func P256OrdInverse(k []byte) ([]byte, error)
- func SM2P256() elliptic.Curve
- type P256Point
- func (q *P256Point) Add(r1, r2 *P256Point) *P256Point
- func (p *P256Point) Bytes() []byte
- func (p *P256Point) BytesCompressed() []byte
- func (q *P256Point) Double(p *P256Point) *P256Point
- func (r *P256Point) ScalarBaseMult(scalar []byte) (*P256Point, error)
- func (r *P256Point) ScalarMult(q *P256Point, scalar []byte) (*P256Point, error)
- func (q *P256Point) Select(p1, p2 *P256Point, cond int) *P256Point
- func (p *P256Point) Set(q *P256Point) *P256Point
- func (p *P256Point) SetBytes(b []byte) (*P256Point, error)
- func (p *P256Point) SetGenerator() *P256Point
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func P256OrdInverse ¶
P256OrdInverse, sets out to in⁻¹ mod org(G). If in is zero, out will be zero. n-2 = 1111111111111111111111111111111011111111111111111111111111111111 1111111111111111111111111111111111111111111111111111111111111111 0111001000000011110111110110101100100001110001100000010100101011 0101001110111011111101000000100100111001110101010100000100100001
Types ¶
type P256Point ¶
type P256Point struct {
// contains filtered or unexported fields
}
P256Point is a P-256 point. The zero value should not be assumed to be valid (although it is in this implementation).
func NewP256Point ¶
func NewP256Point() *P256Point
NewP256Point returns a new P256Point representing the point at infinity.
func (*P256Point) Bytes ¶
Bytes returns the uncompressed or infinity encoding of p, as specified in SEC 1, Version 2.0, Section 2.3.3. Note that the encoding of the point at infinity is shorter than all other encodings.
func (*P256Point) BytesCompressed ¶
BytesCompressed returns the compressed or infinity encoding of p, as specified in SEC 1, Version 2.0, Section 2.3.3. Note that the encoding of the point at infinity is shorter than all other encodings.
func (*P256Point) ScalarBaseMult ¶
ScalarBaseMult sets r = scalar * generator, where scalar is a 32-byte big endian value, and returns r. If scalar is not 32 bytes long, ScalarBaseMult returns an error and the receiver is unchanged.
func (*P256Point) ScalarMult ¶
ScalarMult sets r = scalar * q, where scalar is a 32-byte big endian value, and returns r. If scalar is not 32 bytes long, ScalarBaseMult returns an error and the receiver is unchanged.
func (*P256Point) SetBytes ¶
SetBytes sets p to the compressed, uncompressed, or infinity value encoded in b, as specified in SEC 1, Version 2.0, Section 2.3.4. If the point is not on the curve, it returns nil and an error, and the receiver is unchanged. Otherwise, it returns p.
func (*P256Point) SetGenerator ¶
SetGenerator sets p to the canonical generator and returns p.
Source Files
Directories