ledger package and device package under crypto folder

crypto/device/common.go

@@ -0,0 +1,106 @@
+/*******************************************************************************
+*   (c) 2018 - 2022 ZondaX AG
+*
+*  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
+}