blake512 computation using codahale lib (SSE-optimized)

gistfile1.txt

package main

import (
        "fmt"
        "github.com/codahale/blake2"
        "io"
        "os"
)

func calcStream(r io.Reader) {

        leafSize := uint(5 * 1024 * 1024)
        h := blake2.NewBlake2B()

        for part, totalSize := 0, int64(0); ; part++ {
                partBuffer := make([]byte, leafSize)
                n, err := r.Read(partBuffer)
                if err != nil {
                        return
                }
                partBuffer = partBuffer[:n]
                h.Write(partBuffer)

                totalSize += int64(n)
                lastChunk := uint(n) < leafSize

                if lastChunk {
                        break
                }
        }

        d := h.Sum(nil)
        fmt.Printf("%X", d)
        fmt.Println()
}

func main() {
        calcStream(os.Stdin)
}