Convert SHA1 Hex to Base 16 Integer

Question

I need help porting an algorithm from Ruby to Go.

In Ruby, I have:

hex = Digest::SHA1.hexdigest(str).to_i(16)
hex.to_s(32)

Which creates the SHA1 hexadecimal string, converts it to an integer in base 16, and then back to a string in base 32.

How to achieve the same result in Go?

Answer 1

Here is an example code (playground: https://play.golang.org/p/izBIq97-0S ):

package main

import (
    "crypto/sha1"
    "encoding/base32"
    "fmt"
    "strings"
)

func main() {
    // Input
    exampleString := "example"

    // SHA1 hash
    hash := sha1.New()
    hash.Write([]byte(exampleString))
    hashBytes := hash.Sum(nil)

    // Conversion to base32
    base32str := strings.ToLower(base32.HexEncoding.EncodeToString(hashBytes))

    fmt.Println(base32str)
}

I tested it on this Ruby script and the output is the same:

require 'digest'

str = "example"
hex = Digest::SHA1.hexdigest(str).to_i(16)

puts hex.to_s(32)

---

Change: here is my original answer that reproduces every step from the ruby ​​script, but two of them are not needed (site: https://play.golang.org/p/tyQt3ftb1j ):

package main

import (
    "crypto/sha1"
    "encoding/base32"
    "encoding/hex"
    "fmt"
    "math/big"
    "strings"
)

func main() {
    // Input
    exampleString := "example"

    // SHA1 hash
    hash := sha1.New()
    hash.Write([]byte(exampleString))
    hashBytes := hash.Sum(nil)

    // Hexadecimal conversion
    hexSha1 := hex.EncodeToString(hashBytes)

    // Integer base16 conversion
    intBase16, success := new(big.Int).SetString(hexSha1, 16)
    if !success {
        panic("Failed parsing big Int from hex")
    }

    // Conversion to base32
    base32str := strings.ToLower(base32.HexEncoding.EncodeToString(intBase16.Bytes()))

    fmt.Println(base32str)
}

Answer 2

🙂

h := sha1.New()
h.Write(content)
sha := h.Sum(nil)  // "sha" is uint8 type, encoded in base16

shaStr := hex.EncodeToString(sha)  // String representation

fmt.Printf("%x\n", sha)
fmt.Println(shaStr)

...

fcbc340d999e751840e17f862cc9eaf826cc6079
fcbc340d999e751840e17f862cc9eaf826cc6079