Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

envd/internal/shared/keys/sha256.go

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package keys
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+)
+
+type Sha256Hashing struct{}
+
+func NewSHA256Hashing() *Sha256Hashing {
+	return &Sha256Hashing{}
+}
+
+func (h *Sha256Hashing) Hash(key []byte) string {
+	hashBytes := sha256.Sum256(key)
+
+	hash64 := base64.RawStdEncoding.EncodeToString(hashBytes[:])
+
+	return fmt.Sprintf(
+		"$sha256$%s",
+		hash64,
+	)
+}
+
+func (h *Sha256Hashing) HashWithoutPrefix(key []byte) string {
+	hashBytes := sha256.Sum256(key)
+
+	return base64.RawStdEncoding.EncodeToString(hashBytes[:])
+}