md5與crc32性能對比

感受MD5算法複雜度比crc32高不少，具體高多少呢？
測試一下

// main.go
package main

import (
    "crypto/md5"
    "fmt"
    "hash/crc32"
)

func main() {

    data := []byte("test")
    fmt.Printf("%x", md5.Sum(data))

}

func Crc32IEEE(data []byte) uint32 {
    return crc32.ChecksumIEEE(data)
}

func Md5(data []byte) [16]byte {
    return md5.Sum(data)
}

// main_test.go
package main

import "testing"

func BenchmarkCrc32(b *testing.B) {
    for i := 0; i < b.N; i++ {
        Crc32IEEE([]byte("test"))
    }
}

func BenchmarkMd5(b *testing.B) {
    for i := 0; i < b.N; i++ {
        Md5([]byte("test"))
    }
}

go test -bench=.

---

PASS
BenchmarkCrc32-4 20000000 64.9 ns/op
BenchmarkMd5-4 5000000 274 ns/op
ok test 3.022s

---

md5大體慢4倍左右