1 files changed, 63 insertions, 0 deletions
diff --git a/simulation/encoding.go b/simulation/encoding.go
new file mode 100644
index 0000000..98d1d4a
--- /dev/null
+++ b/simulation/encoding.go
@@ -0,0 +1,63 @@
+package main
+
+import (
+	"encoding/base32"
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+// 32 characters for decoding, using RFC 3548.
+const TALER_BASE32_CHARACTER_SET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
+
+func talerBase32Encode(byts []byte) string {
+	return talerBase32Encoding().EncodeToString(byts)
+}
+
+func talerBase32Decode(str string) ([]byte, error) {
+
+	decoded, err := talerBase32Encoding().DecodeString(strings.ToUpper(str))
+	if err != nil {
+		return nil, err
+	}
+	return decoded, nil
+}
+
+func talerBase32Encoding() *base32.Encoding {
+	// 32 characters for decoding, using RFC 3548.
+	// character set copied from [TALER-EXCHANGE]/src/util/crypto_confirmation.c
+	return base32.NewEncoding(TALER_BASE32_CHARACTER_SET)
+}
+
+func ParseWopid(wopid string) ([]byte, error) {
+
+	unescaped, err := url.PathUnescape(wopid)
+	if err != nil {
+		fmt.Println("encoding", err)
+		return nil, errors.New("decoding failed")
+	}
+
+	wopidBytes, err := talerBase32Decode(unescaped)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(wopidBytes) != 32 {
+		err = errors.New("invalid wopid")
+		fmt.Println("encoding", err)
+		return nil, err
+	}
+
+	return wopidBytes, nil
+}
+
+func FormatWopid(wopid []byte) string {
+
+	return url.PathEscape(talerBase32Encode(wopid))
+}
+
+func ParseEddsaPubKey(key EddsaPublicKey) ([]byte, error) {
+
+	return talerBase32Decode(string(key))
+}