benchmark for bcrypt and scrypt

crypto.go

package crypto
  
import (
  "testing"

  "golang.org/x/crypto/bcrypt"
  "golang.org/x/crypto/scrypt"
)

func BenchmarkBcryptHashCost10(b *testing.B) {
  bstr := []byte("foobar")

  b.ResetTimer()
  for i := 0; i < b.N; i++ {
    bcrypt.GenerateFromPassword(bstr, bcrypt.DefaultCost)
  }
}

func BenchmarkBcryptHashCost4(b *testing.B) {
  bstr := []byte("foobar")

  b.ResetTimer()
  for i := 0; i < b.N; i++ {
    bcrypt.GenerateFromPassword(bstr, bcrypt.MinCost)
  }
}

func BenchmarkScryptHashN32768(b *testing.B) {
  bstr := []byte("foobar")
  bsalt := []byte("salt")

  b.ResetTimer()
  for i := 0; i < b.N; i++ {
    // https://github.com/golang/crypto/blob/3d37316aaa6bd9929127ac9a527abf408178ea7b/scrypt/scrypt.go#L223-L224
    // The recommended parameters for interactive logins as of 2017 are N=32768, r=8 and p=1.
    scrypt.Key(bstr, bsalt, 32768, 8, 1, 32)
  }
}

func BenchmarkScryptHashN256(b *testing.B) {
  bstr := []byte("foobar")
  bsalt := []byte("salt")
 
  b.ResetTimer()
  for i := 0; i < b.N; i++ {
    scrypt.Key(bstr, bsalt, 256, 8, 1, 32)
  }
}

// =>
// BenchmarkBCryptHashCost10-4           20          92228057 ns/op            5204 B/op         11 allocs/op
// BenchmarkBCryptHashCost4-4          1000           1272765 ns/op            5169 B/op         11 allocs/op
// BenchmarkSCryptHashN32768-4           10         129435336 ns/op        33558579 B/op         18 allocs/op
// BenchmarkSCryptHashN256-4           2000            878410 ns/op          266280 B/op         18 allocs/op