common.go

/*******************************************************************************
*   (c) 2018 ZondaX GmbH
*
*  Licensed under the Apache License, Version 2.0 (the "License");
*  you may not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
********************************************************************************/

package ledger_cosmos_go

import (
	"encoding/binary"
	"fmt"
)

// VersionInfo contains app version information
type VersionInfo struct {
	AppMode uint8
	Major   uint8
	Minor   uint8
	Patch   uint8
}

func (c VersionInfo) String() string {
	return fmt.Sprintf("%d.%d.%d", c.Major, c.Minor, c.Patch)
}

// VersionRequiredError the command is not supported by this app
type VersionRequiredError struct {
	Found    VersionInfo
	Required VersionInfo
}

func (e VersionRequiredError) Error() string {
	return fmt.Sprintf("App Version required %s - Version found: %s", e.Required, e.Found)
}

func NewVersionRequiredError(req VersionInfo, ver VersionInfo) error {
	return &VersionRequiredError{
		Found:    ver,
		Required: req,
	}
}

// CheckVersion compares the current version with the required version
func CheckVersion(ver VersionInfo, req VersionInfo) error {
	if ver.Major != req.Major {
		if (ver.Major > req.Major){
			return nil
		}
		return NewVersionRequiredError(req, ver)
	}

	if ver.Minor != req.Minor {
		if (ver.Minor > req.Minor) {
			return nil
		}
		return NewVersionRequiredError(req, ver)
	}

	if (ver.Patch >= req.Patch){
		return nil
	}
	return NewVersionRequiredError(req, ver)
}

func GetBip32bytesv1(bip32Path []uint32, hardenCount int) ([]byte, error) {
	message := make([]byte, 41)
	if len(bip32Path) > 10 {
		return nil, fmt.Errorf("maximum bip32 depth = 10")
	}
	message[0] = byte(len(bip32Path))
	for index, element := range bip32Path {
		pos := 1 + index*4
		value := element
		if index < hardenCount {
			value = 0x80000000 | element
		}
		binary.LittleEndian.PutUint32(message[pos:], value)
	}
	return message, nil
}

func GetBip32bytesv2(bip44Path []uint32, hardenCount int) ([]byte, error) {
	message := make([]byte, 40)
	if len(bip44Path) != 5 {
		return nil, fmt.Errorf("path should contain 5 elements")
	}
	for index, element := range bip44Path {
		pos := index*4
		value := element
		if index < hardenCount {
			value = 0x80000000 | element
		}
		binary.LittleEndian.PutUint32(message[pos:], value)
	}
	return message, nil
}