Share SHA-256 SIMD impl

Signed-off-by: Hidde Beydals <hello@hidde.co>

internal/digest/sha256simd/sha256simd.go

@@ -0,0 +1,27 @@
+package sha256simd
+
+import (
+	"github.com/minio/sha256-simd"
+	"github.com/opencontainers/go-digest"
+	"hash"
+)
+
+const SHA256SIMD = digest.Algorithm("sha256simd")
+
+func init() {
+	digest.RegisterAlgorithm(SHA256SIMD, &sha256simdhash{})
+}
+
+type sha256simdhash struct{}
+
+func (sha256simdhash) Available() bool {
+	return true
+}
+
+func (sha256simdhash) Size() int {
+	return sha256.Size
+}
+
+func (sha256simdhash) New() hash.Hash {
+	return sha256.New()
+}

internal/digest/writer_test.go

@@ -18,6 +18,7 @@ package digest
 
 import (
 	"crypto/rand"
+	"github.com/fluxcd/source-controller/internal/digest/sha256simd"
 	"testing"
 
 	. "github.com/onsi/gomega"
@@ -100,12 +101,16 @@ func benchmarkMultiDigesterWrite(b *testing.B, algos []digest.Algorithm, pSize i
 }
 
 func BenchmarkMultiDigester_Write(b *testing.B) {
-	const pSize = 1024 * 2
+	const pSize = 1024 * 10
 
 	b.Run("sha256", func(b *testing.B) {
 		benchmarkMultiDigesterWrite(b, []digest.Algorithm{digest.SHA256}, pSize)
 	})
 
+	b.Run("sha256-simd", func(b *testing.B) {
+		benchmarkMultiDigesterWrite(b, []digest.Algorithm{sha256simd.SHA256SIMD}, pSize)
+	})
+
 	b.Run("blake3", func(b *testing.B) {
 		benchmarkMultiDigesterWrite(b, []digest.Algorithm{digest.BLAKE3}, pSize)
 	})