refactor/internal (#1216)

* refactor: update import paths in gateway handlers

* refactor: remove obsolete devtools Makefile and README

* build: optimize build process for improved efficiency

* refactor: remove obsolete pkl files related to Matrix and Sonr network configurations

* refactor: move embed code to x/dwn/types

internal/crypto/signatures/schnorr/nem/ed25519_keccak.go

@@ -0,0 +1,320 @@
+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+// This file implements the Ed25519 signature algorithm. See
+// https://ed25519.cr.yp.to/.
+//
+// These functions are also compatible with the “Ed25519” function defined in
+// RFC 8032. However, unlike RFC 8032's formulation, this package's private key
+// representation includes a public key suffix to make multiple signing
+// operations with the same key more efficient. This package refers to the RFC
+// 8032 private key as the “seed”.
+// This code is a port of the public domain, “ref10” implementation of ed25519
+// from SUPERCOP.
+
+package nem
+
+import (
+	"bytes"
+	"crypto"
+	cryptorand "crypto/rand"
+	"fmt"
+	"io"
+	"strconv"
+
+	"filippo.io/edwards25519"
+	"golang.org/x/crypto/sha3"
+
+	"github.com/onsonr/sonr/internal/crypto/internal"
+)
+
+const (
+	// PublicKeySize is the size, in bytes, of public keys as used in this package.
+	PublicKeySize = 32
+	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
+	PrivateKeySize = 64
+	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
+	SignatureSize = 64
+	// SeedSize is the size, in bytes, of private key seeds. These are the private key representations used by RFC 8032.
+	SeedSize = 32
+)
+
+// PublicKey is the type of Ed25519 public keys.
+type PublicKey []byte
+
+// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
+type PrivateKey []byte
+
+// Bytes returns the publicKey in byte array
+func (p PublicKey) Bytes() []byte {
+	return p
+}
+
+// Public returns the PublicKey corresponding to priv.
+func (priv PrivateKey) Public() crypto.PublicKey {
+	publicKey := make([]byte, PublicKeySize)
+	copy(publicKey, priv[32:])
+	return PublicKey(publicKey)
+}
+
+func Keccak512(data []byte) ([]byte, error) {
+	k512 := sha3.NewLegacyKeccak512()
+	_, err := k512.Write(data)
+	if err != nil {
+		return nil, err
+	}
+	return k512.Sum(nil), nil
+}
+
+// Seed returns the private key seed corresponding to priv. It is provided for
+// interoperability with RFC 8032. RFC 8032's private keys correspond to seeds
+// in this package.
+func (priv PrivateKey) Seed() []byte {
+	seed := make([]byte, SeedSize)
+	copy(seed, priv[:32])
+	return seed
+}
+
+// Sign signs the given message with priv.
+// Ed25519 performs two passes over messages to be signed and therefore cannot
+// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
+// indicate the message hasn't been hashed. This can be achieved by passing
+// crypto.Hash(0) as the value for opts.
+func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
+	if opts.HashFunc() != crypto.Hash(0) {
+		return nil, fmt.Errorf("ed25519: cannot sign hashed message")
+	}
+	sig, err := Sign(priv, message)
+	if err != nil {
+		return nil, err
+	}
+	return sig, nil
+}
+
+// GenerateKey generates a public/private key pair using entropy from rand.
+// If rand is nil, crypto/rand.Reader will be used.
+func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) {
+	if rand == nil {
+		rand = cryptorand.Reader
+	}
+
+	seed := make([]byte, SeedSize)
+	if _, err := io.ReadFull(rand, seed); err != nil {
+		return nil, nil, err
+	}
+
+	privateKey, err := NewKeyFromSeed(seed)
+	if err != nil {
+		return nil, nil, err
+	}
+	publicKey := make([]byte, PublicKeySize)
+	copy(publicKey, privateKey[32:])
+
+	return publicKey, privateKey, nil
+}
+
+// NewKeyFromSeed calculates a private key from a seed. It will panic if
+// len(seed) is not SeedSize. This function is provided for interoperability
+// with RFC 8032. RFC 8032's private keys correspond to seeds in this
+// package.
+func NewKeyFromSeed(seed []byte) (PrivateKey, error) {
+	// Outline the function body so that the returned key can be stack-allocated.
+	privateKey := make([]byte, PrivateKeySize)
+	err := newKeyFromSeed(privateKey, seed)
+	if err != nil {
+		return nil, err
+	}
+	return privateKey, nil
+}
+
+func newKeyFromSeed(privateKey, seed []byte) error {
+	if l := len(seed); l != SeedSize {
+		return fmt.Errorf("ed25519: bad seed length: " + strconv.Itoa(l))
+	}
+
+	// Weird required step to get compatibility with the NEM test vectors
+	// Have to reverse the bytes from the given seed
+	digest, err := Keccak512(internal.ReverseScalarBytes(seed))
+	if err != nil {
+		return err
+	}
+
+	sc, err := edwards25519.NewScalar().SetBytesWithClamping(digest[:32])
+	if err != nil {
+		return err
+	}
+
+	A := edwards25519.Point{}
+	A.ScalarBaseMult(sc)
+	publicKeyBytes := A.Bytes()
+
+	copy(privateKey, seed)
+	copy(privateKey[32:], publicKeyBytes[:])
+	return nil
+}
+
+// Sign signs the message with privateKey and returns a signature. It will
+// panic if len(privateKey) is not PrivateKeySize.
+func Sign(privateKey PrivateKey, message []byte) ([]byte, error) {
+	// Outline the function body so that the returned signature can be
+	// stack-allocated.
+	signature := make([]byte, SignatureSize)
+	err := sign(signature, privateKey, message)
+	if err != nil {
+		return nil, err
+	}
+	return signature, nil
+}
+
+func sign(signature, privateKey, message []byte) error {
+	if l := len(privateKey); l != PrivateKeySize {
+		return fmt.Errorf("ed25519: bad private key length: " + strconv.Itoa(l))
+	}
+
+	seed := privateKey[:32]
+	digest, err := Keccak512(internal.ReverseScalarBytes(seed))
+	if err != nil {
+		return err
+	}
+
+	// H(seed) ie. privkey
+	expandedSecretKey := digest[:32]
+	sc, err := edwards25519.NewScalar().SetBytesWithClamping(expandedSecretKey)
+	if err != nil {
+		return err
+	}
+
+	// r = H(H(seed) + msg)
+	hEngine := sha3.NewLegacyKeccak512()
+	_, err = hEngine.Write(digest[32:])
+	if err != nil {
+		return err
+	}
+
+	_, err = hEngine.Write(message)
+	if err != nil {
+		return err
+	}
+
+	var hOut1 [64]byte
+	hEngine.Sum(hOut1[:0])
+
+	// hash output -> scalar
+	// Take 64 byte output from keccak512 so need to set bytes as long
+	r, err := edwards25519.NewScalar().SetUniformBytes(hOut1[:])
+	if err != nil {
+		return err
+	}
+
+	// R = r*G
+	R := edwards25519.Point{}
+	R.ScalarBaseMult(r)
+	RBytes := R.Bytes()
+
+	// s = H(R + pubkey + msg)
+	hEngine.Reset()
+	_, err = hEngine.Write(RBytes)
+	if err != nil {
+		return err
+	}
+
+	_, err = hEngine.Write(privateKey[32:])
+	if err != nil {
+		return err
+	}
+
+	_, err = hEngine.Write(message)
+	if err != nil {
+		return err
+	}
+
+	var hOut2 [64]byte
+	hEngine.Sum(hOut2[:0])
+
+	// hash output -> scalar
+	// Take 64 byte output from keccak512 so need to set bytes as long
+	h, err := edwards25519.NewScalar().SetUniformBytes(hOut2[:])
+	if err != nil {
+		return err
+	}
+
+	// s = (r + h * privKey)
+	s := edwards25519.NewScalar().MultiplyAdd(h, sc, r)
+
+	copy(signature[:], RBytes)
+	copy(signature[32:], s.Bytes())
+
+	return nil
+}
+
+// Verify reports whether sig is a valid signature of message by publicKey. It
+// will panic if len(publicKey) is not PublicKeySize.
+// Previously publicKey is of type PublicKey
+func Verify(publicKey PublicKey, message, sig []byte) (bool, error) {
+	if l := len(publicKey); l != PublicKeySize {
+		return false, fmt.Errorf("ed25519: bad public key length: " + strconv.Itoa(l))
+	}
+
+	if len(sig) != SignatureSize || sig[63]&224 != 0 {
+		return false, fmt.Errorf("ed25519: bad signature size: " + strconv.Itoa(len(sig)))
+	}
+
+	RBytes := sig[:32]
+	sBytes := sig[32:]
+
+	var publicKeyBytes [32]byte
+	copy(publicKeyBytes[:], publicKey)
+
+	A := edwards25519.Point{}
+	_, err := A.SetBytes(publicKeyBytes[:])
+	if err != nil {
+		return false, err
+	}
+
+	negA := edwards25519.Point{}
+	negA.Negate(&A)
+
+	// h = H(R + pubkey + msg)
+	hEngine := sha3.NewLegacyKeccak512()
+	_, err = hEngine.Write(RBytes)
+	if err != nil {
+		return false, err
+	}
+
+	_, err = hEngine.Write(publicKeyBytes[:])
+	if err != nil {
+		return false, err
+	}
+
+	_, err = hEngine.Write(message)
+	if err != nil {
+		return false, err
+	}
+
+	var hOut1 [64]byte
+	hEngine.Sum(hOut1[:0])
+
+	// hash output -> scalar
+	// Take 64 byte output from keccak512 so need to set bytes as long
+	h, err := edwards25519.NewScalar().SetUniformBytes(hOut1[:])
+	if err != nil {
+		return false, err
+	}
+
+	// s was generated in sign so can set as canonical
+	s, err := edwards25519.NewScalar().SetCanonicalBytes(sBytes)
+	if err != nil {
+		return false, err
+	}
+
+	// R' = s*G - h*Pubkey = h*negPubkey + s*G
+	RPrime := edwards25519.Point{}
+	RPrime.VarTimeDoubleScalarBaseMult(h, &negA, s)
+	RPrimeBytes := RPrime.Bytes()
+
+	// Check R == R'
+	return bytes.Equal(RBytes, RPrimeBytes), nil
+}