src/cmd/nncp-hash/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2022 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 // Calculate MTH hash of the file
  19 package main
  20
  21 import (
  22         "bufio"
  23         "encoding/hex"
  24         "flag"
  25         "fmt"
  26         "io"
  27         "log"
  28         "os"
  29         "sync"
  30
  31         "go.cypherpunks.ru/nncp/v8"
  32 )
  33
  34 func usage() {
  35         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
  36         fmt.Fprintf(os.Stderr, "nncp-hash -- calculate MTH hash of the file\n\n")
  37         fmt.Fprintf(os.Stderr, "Usage: %s [-file ...] [-seek X] [-debug] [-progress] [options]\nOptions:\n", os.Args[0])
  38         flag.PrintDefaults()
  39 }
  40
  41 func main() {
  42         var (
  43                 fn        = flag.String("file", "", "Read the file instead of stdin")
  44                 seek      = flag.Uint64("seek", 0, "Seek the file, hash, rewind, hash remaining")
  45                 forceFat  = flag.Bool("force-fat", false, "Force MTHFat implementation usage")
  46                 showPrgrs = flag.Bool("progress", false, "Progress showing")
  47                 debug     = flag.Bool("debug", false, "Print MTH steps calculations")
  48                 version   = flag.Bool("version", false, "Print version information")
  49                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  50         )
  51         log.SetFlags(log.Lshortfile)
  52         flag.Usage = usage
  53         flag.Parse()
  54         if *warranty {
  55                 fmt.Println(nncp.Warranty)
  56                 return
  57         }
  58         if *version {
  59                 fmt.Println(nncp.VersionGet())
  60                 return
  61         }
  62
  63         fd := os.Stdin
  64         var err error
  65         var size int64
  66         if *fn == "" {
  67                 *showPrgrs = false
  68         } else {
  69                 fd, err = os.Open(*fn)
  70                 if err != nil {
  71                         log.Fatalln(err)
  72                 }
  73                 fi, err := fd.Stat()
  74                 if err != nil {
  75                         log.Fatalln(err)
  76                 }
  77                 size = fi.Size()
  78         }
  79
  80         if *debug {
  81                 fmt.Println("Leaf BLAKE3 key:", hex.EncodeToString(nncp.MTHLeafKey[:]))
  82                 fmt.Println("Node BLAKE3 key:", hex.EncodeToString(nncp.MTHNodeKey[:]))
  83         }
  84
  85         var debugger sync.WaitGroup
  86         startDebug := func(events chan nncp.MTHEvent) {
  87                 debugger.Add(1)
  88                 go func() {
  89                         for e := range events {
  90                                 fmt.Println(e.String())
  91                         }
  92                         debugger.Done()
  93                 }()
  94         }
  95         copier := func(w io.Writer) error {
  96                 _, err := nncp.CopyProgressed(
  97                         w, bufio.NewReaderSize(fd, nncp.MTHBlockSize), "hash",
  98                         nncp.LEs{{K: "Pkt", V: *fn}, {K: "FullSize", V: size - int64(*seek)}},
  99                         *showPrgrs,
 100                 )
 101                 return err
 102         }
 103
 104         var sum []byte
 105         if *forceFat {
 106                 mth := nncp.MTHFatNew()
 107                 if *debug {
 108                         startDebug(mth.Events())
 109
 110                 }
 111                 if err = copier(mth); err != nil {
 112                         log.Fatalln(err)
 113                 }
 114                 sum = mth.Sum(nil)
 115         } else {
 116                 mth := nncp.MTHSeqNew(size, int64(*seek))
 117                 if *debug {
 118                         startDebug(mth.Events())
 119                 }
 120                 if *seek != 0 {
 121                         if *fn == "" {
 122                                 log.Fatalln("-file is required with -seek")
 123                         }
 124                         if _, err = fd.Seek(int64(*seek), io.SeekStart); err != nil {
 125                                 log.Fatalln(err)
 126                         }
 127                 }
 128                 if err = copier(mth); err != nil {
 129                         log.Fatalln(err)
 130                 }
 131                 if *seek != 0 {
 132                         if _, err = fd.Seek(0, io.SeekStart); err != nil {
 133                                 log.Fatalln(err)
 134                         }
 135                         if _, err = mth.PreaddFrom(
 136                                 bufio.NewReaderSize(fd, nncp.MTHBlockSize),
 137                                 *fn, *showPrgrs,
 138                         ); err != nil {
 139                                 log.Fatalln(err)
 140                         }
 141                 }
 142                 sum = mth.Sum(nil)
 143         }
 144         debugger.Wait()
 145         fmt.Println(hex.EncodeToString(sum))
 146 }