Go vs Python - SHA1 and MD5

hasher.go

package hasher

import (
	"crypto/md5"
	"crypto/sha1"
	"encoding/hex"
	"io"
	"os"
)

func HashSHA1(chunk int) string {
	file, err := os.Open("nexus_latest.tar")
	if err != nil {
		panic(err)
	}

	defer file.Close()

	hash := sha1.New()
	buffer := make([]byte, chunk)

	for {
		n, err := file.Read(buffer)
		hash.Write(buffer[0:n])

		if err == io.EOF {
			break
		}
	}

	return hex.EncodeToString(hash.Sum(nil))
}

func HashMD5(chunk int) string {
	file, err := os.Open("nexus_latest.tar")
	if err != nil {
		panic(err)
	}

	defer file.Close()

	hash := md5.New()
	buffer := make([]byte, chunk)

	for {
		n, err := file.Read(buffer)
		hash.Write(buffer[0:n])

		if err == io.EOF {
			break
		}
	}

	return hex.EncodeToString(hash.Sum(nil))
}

func HashSHA1Copy() string {
        file, err := os.Open("nexus_latest.tar")
        if err != nil {
                panic(err)
        }

        defer file.Close()

        hash := sha1.New()
        io.Copy(hash, file)

        return hex.EncodeToString(hash.Sum(nil))
}

func HashMD5Copy() string {
        file, err := os.Open("nexus_latest.tar")
        if err != nil {
                panic(err)
        }

        defer file.Close()

        hash := md5.New()
        io.Copy(hash, file)

        return hex.EncodeToString(hash.Sum(nil))
}

hasher.py

"""Compare hash rates of MD5 and SHA1 over N rounds and X chunk size."""
import sys
import timeit
import hashlib

def hash(sz=10240, func=hashlib.sha1):
    h = func()

    with open('nexus_latest.tar', "rb") as fin:
        while chunk := fin.read(sz):
            h.update(chunk)

    return h.hexdigest()


def benchmark_md5_chunk_8(rounds: int):
    md5 = timeit.Timer(lambda: hash(sz=8 * 1024, func=hashlib.md5)).timeit(number = rounds)
    print(f"ok\thasher\t{md5}s")


def benchmark_sha1_chunk_8(rounds: int):
    md5 = timeit.Timer(lambda: hash(sz=8 * 1024, func=hashlib.sha1)).timeit(number = rounds)
    print(f"ok\thasher\t{md5}s")


if __name__ == "__main__":
    # This is amazingly gross, but we're a benchmark.
    if len(sys.argv) < 3:
        print("Usage: hasher.py <case> <rounds>")
        sys.exit(0)

    case = getattr(sys.modules[__name__], sys.argv[1])
    count = int(sys.argv[2])
    case(count)

hasher_test.go

package hasher

import (
	"testing"
)

var result string

func BenchmarkMD5Chunk8(b *testing.B) {
	var r string

	for i := 0; i < b.N; i++ {
		r = HashMD5(8 * 1024)
	}

	result = r
}

func BenchmarkSHA1Chunk8(b *testing.B) {
	var r string

	for i := 0; i < b.N; i++ {
		r = HashSHA1(8 * 1024)
	}
	result = r
}

func BenchmarkMD5Copy(b *testing.B) {
	var r string

	for i := 0; i < b.N; i++ {
		r = HashMD5Copy()
	}

	result = r
}

func BenchmarkSHA1Copy(b *testing.B) {
	var r string

	for i := 0; i < b.N; i++ {
		r = HashSHA1Copy()
	}
	result = r
}

Full output requested when run with -benchtime 10x and -count 10:

MD5;

$ go test -bench=BenchmarkMD5Chunk8 -benchtime 10x
goos: darwin
goarch: amd64
pkg: hasher
cpu: Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
BenchmarkMD5Chunk8-8   	      10	1005807555 ns/op
PASS
ok  	hasher	11.403s

$ go test -bench=BenchmarkMD5Chunk8 -count 10
goos: darwin
goarch: amd64
pkg: hasher
cpu: Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
BenchmarkMD5Chunk8-8   	       1	1054308178 ns/op
BenchmarkMD5Chunk8-8   	       1	1040079144 ns/op
BenchmarkMD5Chunk8-8   	       1	1020537304 ns/op
BenchmarkMD5Chunk8-8   	       1	1021756455 ns/op
BenchmarkMD5Chunk8-8   	       1	1080426179 ns/op
BenchmarkMD5Chunk8-8   	       1	1012884916 ns/op
BenchmarkMD5Chunk8-8   	       1	1006444572 ns/op
BenchmarkMD5Chunk8-8   	       1	1003369154 ns/op
BenchmarkMD5Chunk8-8   	       1	1009236434 ns/op
BenchmarkMD5Chunk8-8   	       2	1001233669 ns/op
PASS
ok  	hasher	12.353s

SHA1:

$ go test -bench=BenchmarkSHA1Chunk8 -benchtime 10x
goos: darwin
goarch: amd64
pkg: hasher
cpu: Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
BenchmarkSHA1Chunk8-8   	      10	 772829689 ns/op
PASS
ok  	hasher	8.672s

$ go test -bench=BenchmarkSHA1Chunk8 -count 10
goos: darwin
goarch: amd64
pkg: hasher
cpu: Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
BenchmarkSHA1Chunk8-8   	       2	 758764051 ns/op
BenchmarkSHA1Chunk8-8   	       2	 756892006 ns/op
BenchmarkSHA1Chunk8-8   	       2	 758007766 ns/op
BenchmarkSHA1Chunk8-8   	       2	 756452965 ns/op
BenchmarkSHA1Chunk8-8   	       2	 760778676 ns/op
BenchmarkSHA1Chunk8-8   	       2	 753645592 ns/op
BenchmarkSHA1Chunk8-8   	       2	 753705684 ns/op
BenchmarkSHA1Chunk8-8   	       2	 753714502 ns/op
BenchmarkSHA1Chunk8-8   	       2	 757031118 ns/op
BenchmarkSHA1Chunk8-8   	       2	 751179043 ns/op
PASS
ok  	hasher	22.982s