Converting byte array into Integer

[Abhinav Srivastava]

Hi,

I wrote a hasher file for sha1 hashing for chord protocol implementation. Here is the code :

package main

import (

    "fmt"

    "crypto/sha1"

    "time"

)

func main() {

    s:="Go is GOOD"

    h:=sha1.New()

    h.Write([]byte(s))

    bs:=h.Sum(nil)

    fmt.Println(s)

    fmt.Println("%x \n",bs)

    time.Sleep(12 * 1e9)

}

The problem is I want to convert the byte array obtained into Integer so that I can take mod of that value with some value. How to convert byte array to Integer in golang , I tried on net but could not find a good solution for this.

Also, please guide me if Golang is a good language for implementing distributed algorithm since I took up and have started learning golang for course project. Is there any limitation while implementing distributed algorithms like chord protocol.

Thansk & Regards

Abhinav

[Jan Mercl]

On Tue, Oct 29, 2013 at 8:51 AM, Abhinav Srivastava
<abhi1988s...@gmail.com> wrote:

If a byte array has to be interpreted as an integer then it's
effectively just a number (sequence of digits) in base 256 (every byte
is a single digit in that base). Apply standard rules for conversion
between number bases.

-j

[Volker Dobler]

Depending on the modulus all you need is the last byte of the sha1.

E.g. computing "sha1(s) % 4" would be just:

  bs[len(bs)-1] % 4

V.

[Péter Szilágyi]

Hi,

The simplest solution is:

new(big.Int).SetBytes(raw)

And btw, Go is perfect for distributed systems :) Take a peek at my messaging system, it's based on Pastry + Scribe at the core [1]. Specifically, for the ID space handling look at this source [2].

Cheers,

  Peter

[1]. http://iris.karalabe.com/

[2]. https://github.com/karalabe/iris/blob/master/proto/overlay/space.go

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[li...@eng.ucsd.edu]

This is a nice one.

I tried func Uvarint(buf []byte) (uint64, int), did not work. 

Still need to convert [16]byte to []byte, but good enough.