restructuring, part 3 of many

1 files changed, 36 insertions, 0 deletions

diff --git a/util/key.go b/util/key.go
new file mode 100644
index 0000000..458d7c0
--- /dev/null
+++ b/util/key.go
@@ -0,0 +1,36 @@
+package util
+
+import (
+	"crypto/sha512"
+	"encoding/hex"
+	"math/rand"
+	"strings"
+)
+
+const domain = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+func CreateKey(len int) string {
+	// TODO: provided that CreateTripCode still uses sha512, the max len can be 128 at most.
+	if len > 128 {
+		panic("len is greater than 128") // awful way to do it
+	}
+
+	str := CreateTripCode(RandomID(len))
+	return str[:len]
+}
+
+func CreateTripCode(input string) string {
+	out := sha512.Sum512([]byte(input))
+
+	return hex.EncodeToString(out[:])
+}
+
+func RandomID(size int) string {
+	rng := size
+	newID := strings.Builder{}
+	for i := 0; i < rng; i++ {
+		newID.WriteByte(domain[rand.Intn(len(domain))])
+	}
+
+	return newID.String()
+}