Re-enabling support for go 1.12.

Author: armfazh

.github/workflows/ci-actions.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-18.04
     strategy:
       matrix:
-        GOVER: ['1.14', '1.13']
+        GOVER: ['1.14', '1.13', '1.12']
     steps:
       - name: Checkout
         uses: actions/checkout@v2

go.mod

@@ -1,5 +1,5 @@
 module github.com/cloudflare/circl
 
-go 1.13
+go 1.12
 
-require golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae
+require golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed

go.sum

@@ -1,2 +1,2 @@
-golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae h1:Ih9Yo4hSPImZOpfGuA4bR/ORKTAbhZo2AbWNRCnevdo=
-golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed h1:uPxWBzB3+mlnjy9W58qY1j/cjyFjutgw/Vhan2zLy/A=
+golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

sign/ed25519/ed25519.go

@@ -38,7 +38,6 @@ package ed25519
 import (
 	"bytes"
 	"crypto"
-	cryptoEd25519 "crypto/ed25519"
 	cryptoRand "crypto/rand"
 	"crypto/sha512"
 	"crypto/subtle"
@@ -90,9 +89,6 @@ const (
 	ED25519Ctx
 )
 
-// PublicKey is the type of Ed25519 public keys.
-type PublicKey = cryptoEd25519.PublicKey
-
 // PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
 type PrivateKey []byte
 

sign/ed25519/pubkey.go

@@ -0,0 +1,8 @@
+// +build !go1.12
+
+package ed25519
+
+import cryptoEd25519 "crypto/ed25519"
+
+// PublicKey is the type of Ed25519 public keys.
+type PublicKey = cryptoEd25519.PublicKey

sign/ed25519/pubkey112.go

@@ -0,0 +1,20 @@
+// +build go1.12
+
+package ed25519
+
+import (
+	"bytes"
+	"crypto"
+)
+
+// PublicKey is the type of Ed25519 public keys.
+type PublicKey []byte
+
+// Equal reports whether pub and x have the same value.
+func (pub PublicKey) Equal(x crypto.PublicKey) bool {
+	xx, ok := x.(PublicKey)
+	if !ok {
+		return false
+	}
+	return bytes.Equal(pub, xx)
+}