135 lines
3.7 KiB
Go
135 lines
3.7 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Code generated by generate.go. DO NOT EDIT.
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package fiat
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import (
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"crypto/subtle"
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"errors"
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)
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// P384Element is an integer modulo 2^384 - 2^128 - 2^96 + 2^32 - 1.
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//
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// The zero value is a valid zero element.
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type P384Element struct {
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// Values are represented internally always in the Montgomery domain, and
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// converted in Bytes and SetBytes.
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x p384MontgomeryDomainFieldElement
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}
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const p384ElementLen = 48
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type p384UntypedFieldElement = [6]uint64
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// One sets e = 1, and returns e.
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func (e *P384Element) One() *P384Element {
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p384SetOne(&e.x)
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return e
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}
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// Equal returns 1 if e == t, and zero otherwise.
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func (e *P384Element) Equal(t *P384Element) int {
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eBytes := e.Bytes()
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tBytes := t.Bytes()
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return subtle.ConstantTimeCompare(eBytes, tBytes)
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}
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var p384ZeroEncoding = new(P384Element).Bytes()
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// IsZero returns 1 if e == 0, and zero otherwise.
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func (e *P384Element) IsZero() int {
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eBytes := e.Bytes()
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return subtle.ConstantTimeCompare(eBytes, p384ZeroEncoding)
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}
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// Set sets e = t, and returns e.
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func (e *P384Element) Set(t *P384Element) *P384Element {
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e.x = t.x
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return e
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}
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// Bytes returns the 48-byte big-endian encoding of e.
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func (e *P384Element) Bytes() []byte {
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// This function is outlined to make the allocations inline in the caller
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// rather than happen on the heap.
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var out [p384ElementLen]byte
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return e.bytes(&out)
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}
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func (e *P384Element) bytes(out *[p384ElementLen]byte) []byte {
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var tmp p384NonMontgomeryDomainFieldElement
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p384FromMontgomery(&tmp, &e.x)
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p384ToBytes(out, (*p384UntypedFieldElement)(&tmp))
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p384InvertEndianness(out[:])
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return out[:]
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}
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// p384MinusOneEncoding is the encoding of -1 mod p, so p - 1, the
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// highest canonical encoding. It is used by SetBytes to check for non-canonical
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// encodings such as p + k, 2p + k, etc.
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var p384MinusOneEncoding = new(P384Element).Sub(
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new(P384Element), new(P384Element).One()).Bytes()
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// SetBytes sets e = v, where v is a big-endian 48-byte encoding, and returns e.
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// If v is not 48 bytes or it encodes a value higher than 2^384 - 2^128 - 2^96 + 2^32 - 1,
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// SetBytes returns nil and an error, and e is unchanged.
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func (e *P384Element) SetBytes(v []byte) (*P384Element, error) {
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if len(v) != p384ElementLen {
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return nil, errors.New("invalid P384Element encoding")
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}
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for i := range v {
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if v[i] < p384MinusOneEncoding[i] {
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break
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}
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if v[i] > p384MinusOneEncoding[i] {
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return nil, errors.New("invalid P384Element encoding")
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}
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}
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var in [p384ElementLen]byte
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copy(in[:], v)
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p384InvertEndianness(in[:])
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var tmp p384NonMontgomeryDomainFieldElement
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p384FromBytes((*p384UntypedFieldElement)(&tmp), &in)
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p384ToMontgomery(&e.x, &tmp)
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return e, nil
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}
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// Add sets e = t1 + t2, and returns e.
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func (e *P384Element) Add(t1, t2 *P384Element) *P384Element {
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p384Add(&e.x, &t1.x, &t2.x)
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return e
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}
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// Sub sets e = t1 - t2, and returns e.
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func (e *P384Element) Sub(t1, t2 *P384Element) *P384Element {
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p384Sub(&e.x, &t1.x, &t2.x)
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return e
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}
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// Mul sets e = t1 * t2, and returns e.
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func (e *P384Element) Mul(t1, t2 *P384Element) *P384Element {
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p384Mul(&e.x, &t1.x, &t2.x)
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return e
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}
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// Square sets e = t * t, and returns e.
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func (e *P384Element) Square(t *P384Element) *P384Element {
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p384Square(&e.x, &t.x)
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return e
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}
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// Select sets v to a if cond == 1, and to b if cond == 0.
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func (v *P384Element) Select(a, b *P384Element, cond int) *P384Element {
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p384Selectznz((*p384UntypedFieldElement)(&v.x), p384Uint1(cond),
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(*p384UntypedFieldElement)(&b.x), (*p384UntypedFieldElement)(&a.x))
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return v
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}
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func p384InvertEndianness(v []byte) {
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for i := 0; i < len(v)/2; i++ {
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v[i], v[len(v)-1-i] = v[len(v)-1-i], v[i]
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}
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}
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