enable stylecheck

Author: mmcloughlin

Diff for: .etc/golangci.yml

@@ -3,7 +3,6 @@ linters:
   disable:
   - ineffassign
   - gocritic
-  - stylecheck
   - errcheck
   - misspell
   - scopelint

Diff for: dh/sidh/sike.go

@@ -222,7 +222,7 @@ func (c *KEM) encrypt(ctext []byte, rng io.Reader, pub *PublicKey, ptext []byte)
 	var ptextLen = len(ptext)
 	// c1 must be security level + 64 bits (see [SIKE] 1.4 and 4.3.3)
 	if ptextLen != (pub.params.KemSize + 8) {
-		return errors.New("Unsupported message length")
+		return errors.New("unsupported message length")
 	}
 
 	skA := NewPrivateKey(pub.params.ID, KeyVariantSidhA)

Diff for: internal/test/test.go

@@ -40,7 +40,7 @@ func CheckIsErr(t testing.TB, err error, msg string) { t.Helper(); checkErr(t, e
 
 // CheckPanic returns true if call to function 'f' caused panic
 func CheckPanic(f func()) error {
-	var hasPaniced = errors.New("No panic detected")
+	var hasPaniced = errors.New("no panic detected")
 	defer func() {
 		if r := recover(); r != nil {
 			hasPaniced = nil