Golint fixes

pkg/utils/crypto/sha1/sha1_darwin.go

@@ -98,10 +98,10 @@ func (d *digest) Write(p []byte) (nn int, err error) {
 }
 
 // Return checksum bytes
-func (d0 *digest) Sum(in []byte) []byte {
+func (d *digest) Sum(in []byte) []byte {
 	// Make a copy of d0 so that caller can keep writing and summing.
-	d := *d0
-	hash := d.checkSum()
+	d0 := *d
+	hash := d0.checkSum()
 	return append(in, hash[:]...)
 }
 

pkg/utils/crypto/sha512/sha512_darwin.go

@@ -6,6 +6,7 @@ import (
 	"crypto/sha512"
 )
 
+// The size of a SHA512 checksum in bytes.
 const (
 	Size = sha512.Size
 )