Checkpoint 5

hash/hash.go

@@ -0,0 +1,21 @@
+package hash
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+
+	"golang.org/x/crypto/scrypt"
+)
+
+func HashCardUid(card uint64) string {
+	b := make([]byte, 8)
+	binary.LittleEndian.PutUint64(b, card)
+
+	hashed, err := scrypt.Key(b, []byte("hkRXwLlQKmCJoy5qaahp"), 16384, 8, 1, 64)
+	if err != nil {
+		panic(err) // can only happen when scrypt params are garbage
+	}
+
+	hashedHex := hex.EncodeToString(hashed)
+	return hashedHex
+}