make sure the standard algorithms are registered

This makes sure that the expected algorithms are registered when
using this package.

Currently, the consumer of the package must import these, otherwise it's
not registered, resultig in "unsupported digest algorithm" errors.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

algorithm_test.go

@@ -19,8 +19,6 @@ import (
 	"bytes"
 	"crypto"
 	"crypto/rand"
-	_ "crypto/sha256"
-	_ "crypto/sha512"
 	"flag"
 	"fmt"
 	"strings"

digestset/set_test.go

@@ -17,7 +17,6 @@ package digestset
 
 import (
 	"crypto/sha256"
-	_ "crypto/sha512"
 	"encoding/binary"
 	"math/rand"
 	"testing"

sha.go

@@ -2,6 +2,12 @@ package digest
 
 import (
 	"crypto"
+
+	// make sure crypto.SHA256 is registered
+	_ "crypto/sha256"
+
+	// make sure crypto.sha512 and crypto.SHA384 are registered
+	_ "crypto/sha512"
 )
 
 const (