keycard-go/derivationpath/encoder.go

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2019-03-15 16:03:01 +00:00
package derivationpath
import (
"bytes"
"encoding/binary"
"fmt"
"strings"
)
func Encode(rawPath []uint32) string {
segments := []string{string(tokenMaster)}
for _, i := range rawPath {
suffix := ""
if i >= hardenedStart {
i = i - hardenedStart
suffix = string(tokenHardened)
}
segments = append(segments, fmt.Sprintf("%d%s", i, suffix))
}
return strings.Join(segments, string(tokenSeparator))
}
func EncodeFromBytes(data []byte) (string, error) {
buf := bytes.NewBuffer(data)
rawPath := make([]uint32, buf.Len()/4)
err := binary.Read(buf, binary.BigEndian, &rawPath)
if err != nil {
return "", err
}
return Encode(rawPath), nil
}