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56 lines
995 B
Go
56 lines
995 B
Go
// Copyright 2022 Martin Dosch.
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// Use of this source code is governed by the BSD-2-clause
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// license that can be found in the LICENSE file.
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package main
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import (
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"bytes"
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"crypto/rand"
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"fmt"
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"log"
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"os"
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)
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func readFile(path string) (*bytes.Buffer, error) {
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file, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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buffer := new(bytes.Buffer)
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_, err = buffer.ReadFrom(file)
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if err != nil {
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return nil, err
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}
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return buffer, nil
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}
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func getRpad(messageLength int) string {
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length := 100 - messageLength%100
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rpad := make([]byte, length)
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_, err := rand.Read(rpad)
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if err != nil {
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log.Fatal(err)
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}
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return fmt.Sprintf("%x", rpad)
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}
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func getID() string {
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id := make([]byte, 12)
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_, err := rand.Read(id)
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if err != nil {
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log.Fatal(err)
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}
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return fmt.Sprintf("%x-%x-%x", id[0:4], id[4:8], id[8:])
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}
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func getShortID() string {
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id := make([]byte, 4)
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_, err := rand.Read(id)
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if err != nil {
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log.Fatal(err)
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}
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return fmt.Sprintf("%x", id[0:4])
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}
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