src/cmd/nncp-hash/main.go

   1 /*
   2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
   3 Copyright (C) 2016-2021 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/v7"
  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                 showPrgrs = flag.Bool("progress", false, "Progress showing")
  46                 debug     = flag.Bool("debug", false, "Print MTH steps calculations")
  47                 version   = flag.Bool("version", false, "Print version information")
  48                 warranty  = flag.Bool("warranty", false, "Print warranty information")
  49         )
  50         log.SetFlags(log.Lshortfile)
  51         flag.Usage = usage
  52         flag.Parse()
  53         if *warranty {
  54                 fmt.Println(nncp.Warranty)
  55                 return
  56         }
  57         if *version {
  58                 fmt.Println(nncp.VersionGet())
  59                 return
  60         }
  61
  62         fd := os.Stdin
  63         var err error
  64         var size int64
  65         if *fn == "" {
  66                 *showPrgrs = false
  67         } else {
  68                 fd, err = os.Open(*fn)
  69                 if err != nil {
  70                         log.Fatalln(err)
  71                 }
  72                 fi, err := fd.Stat()
  73                 if err != nil {
  74                         log.Fatalln(err)
  75                 }
  76                 size = fi.Size()
  77         }
  78         mth := nncp.MTHNew(size, int64(*seek))
  79         var debugger sync.WaitGroup
  80         if *debug {
  81                 fmt.Println("Leaf BLAKE3 key:", hex.EncodeToString(nncp.MTHLeafKey[:]))
  82                 fmt.Println("Node BLAKE3 key:", hex.EncodeToString(nncp.MTHNodeKey[:]))
  83                 mth.Events = make(chan nncp.MTHEvent)
  84                 debugger.Add(1)
  85                 go func() {
  86                         for e := range mth.Events {
  87                                 var t string
  88                                 switch e.Type {
  89                                 case nncp.MTHEventAppend:
  90                                         t = "Add"
  91                                 case nncp.MTHEventPrepend:
  92                                         t = "Pre"
  93                                 case nncp.MTHEventFold:
  94                                         t = "Fold"
  95                                 }
  96                                 fmt.Printf(
  97                                         "%s\t%03d\t%06d\t%s\n",
  98                                         t, e.Level, e.Ctr, hex.EncodeToString(e.Hsh),
  99                                 )
 100                         }
 101                         debugger.Done()
 102                 }()
 103         }
 104         if *seek != 0 {
 105                 if *fn == "" {
 106                         log.Fatalln("-file is required with -seek")
 107                 }
 108                 if _, err = fd.Seek(int64(*seek), io.SeekStart); err != nil {
 109                         log.Fatalln(err)
 110                 }
 111         }
 112         if _, err = nncp.CopyProgressed(
 113                 mth, bufio.NewReaderSize(fd, nncp.MTHBlockSize),
 114                 "hash", nncp.LEs{{K: "Pkt", V: *fn}, {K: "FullSize", V: size - int64(*seek)}},
 115                 *showPrgrs,
 116         ); err != nil {
 117                 log.Fatalln(err)
 118         }
 119         if *seek != 0 {
 120                 if _, err = fd.Seek(0, io.SeekStart); err != nil {
 121                         log.Fatalln(err)
 122                 }
 123                 if *showPrgrs {
 124                         mth.PktName = *fn
 125                 }
 126                 if _, err = mth.PrependFrom(bufio.NewReaderSize(fd, nncp.MTHBlockSize)); err != nil {
 127                         log.Fatalln(err)
 128                 }
 129         }
 130         sum := mth.Sum(nil)
 131         debugger.Wait()
 132         fmt.Println(hex.EncodeToString(sum))
 133 }