added shamir keys

pkg/core/encoding.go

@@ -36,6 +36,18 @@ func (e Encoding) EncodeToString(src []byte) string {
 	return hex.EncodeToString(src)
 }
 
+func (e Encoding) Decode(src string) ([]byte, error) {
+	switch e {
+	case Base32:
+		return b32raw.DecodeString(src)
+	case Base64:
+		return base64.RawStdEncoding.DecodeString(src)
+	case Base64URL:
+		return base64.RawURLEncoding.DecodeString(src)
+	}
+	return hex.DecodeString(src)
+}
+
 func EncodingFromString(e string) Encoding {
 	switch e {
 	case "base32":

pkg/core/key.go

@@ -20,6 +20,7 @@ type Key struct {
 	Created  int64
 	Size     int
 	Encoding Encoding
+	Type     Type
 	Key      string
 }
 

pkg/core/tablewriter.go

@@ -0,0 +1,9 @@
+// Copyright (C) 2023 Marius Schellenberger
+
+package core
+
+type TableWriter interface {
+	Len() int
+	Fields() string
+	Values() []string
+}

pkg/core/type.go

@@ -0,0 +1,55 @@
+// Copyright (C) 2023 Marius Schellenberger
+
+package core
+
+import (
+	"bytes"
+
+	"github.com/hashicorp/vault/shamir"
+)
+
+type Type int
+
+func (t Type) String() string {
+	switch t {
+	case Shamir:
+		return "shamir"
+	}
+	return "plain"
+}
+
+func (t Type) Decode(src []byte) ([]byte, error) {
+	switch t {
+	case Shamir:
+		plen := len(src) / 2
+		part1 := src[0:plen]
+		part2 := src[plen:]
+		return shamir.Combine([][]byte{part1, part2})
+	}
+	return src, nil
+}
+
+func (t Type) Encode(src []byte) ([]byte, error) {
+	switch t {
+	case Shamir:
+		parts, err := shamir.Split(src, 2, 2)
+		if err != nil {
+			return nil, err
+		}
+		return bytes.Join(parts, nil), nil
+	}
+	return src, nil
+}
+
+func TypeFromString(t string) Type {
+	switch t {
+	case "shamir":
+		return Shamir
+	}
+	return Plain
+}
+
+const (
+	Plain Type = iota
+	Shamir
+)