go mod tidy

```console
$ go mod tidy -v
(snip)
unused github.com/agl/ed25519
```
Also add base .gitattributes file to normalize line endings in the repository across differing developer environments.

.gitattributes

@@ -0,0 +1,3 @@
+*               text=auto
+*.go            text        diff=golang
+*.bat           text        eol=crlf

go.mod

@@ -5,7 +5,6 @@ go 1.13
 require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/VividCortex/ewma v1.1.1
-	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412
 	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
 	github.com/dchest/safefile v0.0.0-20151022103144-855e8d98f185
 	github.com/facebookgo/atomicfile v0.0.0-20151019160806-2de1f203e7d5 // indirect

go.sum

@@ -6,8 +6,6 @@ github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmH
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
 github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635 h1:52m0LGchQBBVqJRyYYufQuIbVqRawmubW3OFGqK1ekw=
 github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635/go.mod h1:lmLxL+FV291OopO93Bwf9fQLQeLyt33VJRUg5VJ30us=
-github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 h1:w1UutsfOrms1J05zt7ISrnJIXKzwaspym5BTKGx93EI=
-github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412/go.mod h1:WPjqKcmVOxf0XSf3YxCJs6N6AOSrOx3obionmG7T0y0=
 github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf h1:iW4rZ826su+pqaw19uhpSCzhj44qo35pNgKFGqzDKkU=
 github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/dchest/safefile v0.0.0-20151022103144-855e8d98f185 h1:3T8ZyTDp5QxTx3NU48JVb2u+75xc040fofcBaN+6jPA=

vendor/github.com/agl/ed25519/LICENSE

@@ -1,27 +0,0 @@
-Copyright (c) 2012 The Go Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/agl/ed25519/ed25519.go

@@ -1,127 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package ed25519 implements the Ed25519 signature algorithm. See
-// http://ed25519.cr.yp.to/.
-package ed25519
-
-// This code is a port of the public domain, "ref10" implementation of ed25519
-// from SUPERCOP.
-
-import (
-	"crypto/sha512"
-	"crypto/subtle"
-	"io"
-
-	"github.com/agl/ed25519/edwards25519"
-)
-
-const (
-	PublicKeySize  = 32
-	PrivateKeySize = 64
-	SignatureSize  = 64
-)
-
-// GenerateKey generates a public/private key pair using randomness from rand.
-func GenerateKey(rand io.Reader) (publicKey *[PublicKeySize]byte, privateKey *[PrivateKeySize]byte, err error) {
-	privateKey = new([64]byte)
-	publicKey = new([32]byte)
-	_, err = io.ReadFull(rand, privateKey[:32])
-	if err != nil {
-		return nil, nil, err
-	}
-
-	h := sha512.New()
-	h.Write(privateKey[:32])
-	digest := h.Sum(nil)
-
-	digest[0] &= 248
-	digest[31] &= 127
-	digest[31] |= 64
-
-	var A edwards25519.ExtendedGroupElement
-	var hBytes [32]byte
-	copy(hBytes[:], digest)
-	edwards25519.GeScalarMultBase(&A, &hBytes)
-	A.ToBytes(publicKey)
-
-	copy(privateKey[32:], publicKey[:])
-	return
-}
-
-// Sign signs the message with privateKey and returns a signature.
-func Sign(privateKey *[PrivateKeySize]byte, message []byte) *[SignatureSize]byte {
-	h := sha512.New()
-	h.Write(privateKey[:32])
-
-	var digest1, messageDigest, hramDigest [64]byte
-	var expandedSecretKey [32]byte
-	h.Sum(digest1[:0])
-	copy(expandedSecretKey[:], digest1[:])
-	expandedSecretKey[0] &= 248
-	expandedSecretKey[31] &= 63
-	expandedSecretKey[31] |= 64
-
-	h.Reset()
-	h.Write(digest1[32:])
-	h.Write(message)
-	h.Sum(messageDigest[:0])
-
-	var messageDigestReduced [32]byte
-	edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
-	var R edwards25519.ExtendedGroupElement
-	edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
-
-	var encodedR [32]byte
-	R.ToBytes(&encodedR)
-
-	h.Reset()
-	h.Write(encodedR[:])
-	h.Write(privateKey[32:])
-	h.Write(message)
-	h.Sum(hramDigest[:0])
-	var hramDigestReduced [32]byte
-	edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
-
-	var s [32]byte
-	edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
-
-	signature := new([64]byte)
-	copy(signature[:], encodedR[:])
-	copy(signature[32:], s[:])
-	return signature
-}
-
-// Verify returns true iff sig is a valid signature of message by publicKey.
-func Verify(publicKey *[PublicKeySize]byte, message []byte, sig *[SignatureSize]byte) bool {
-	if sig[63]&224 != 0 {
-		return false
-	}
-
-	var A edwards25519.ExtendedGroupElement
-	if !A.FromBytes(publicKey) {
-		return false
-	}
-	edwards25519.FeNeg(&A.X, &A.X)
-	edwards25519.FeNeg(&A.T, &A.T)
-
-	h := sha512.New()
-	h.Write(sig[:32])
-	h.Write(publicKey[:])
-	h.Write(message)
-	var digest [64]byte
-	h.Sum(digest[:0])
-
-	var hReduced [32]byte
-	edwards25519.ScReduce(&hReduced, &digest)
-
-	var R edwards25519.ProjectiveGroupElement
-	var b [32]byte
-	copy(b[:], sig[32:])
-	edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &b)
-
-	var checkR [32]byte
-	R.ToBytes(&checkR)
-	return subtle.ConstantTimeCompare(sig[:32], checkR[:]) == 1
-}

vendor/modules.txt

@@ -6,9 +6,6 @@ github.com/VividCortex/ewma
 github.com/aead/chacha20/chacha
 # github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635
 github.com/aead/poly1305
-# github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412
-github.com/agl/ed25519
-github.com/agl/ed25519/edwards25519
 # github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
 github.com/coreos/go-systemd/activation
 github.com/coreos/go-systemd/daemon