gen.go

Documentation: github.com/cloudflare/circl/kem/sike

     1  //go:build ignore
     2  // +build ignore
     3  
     4  // Autogenerates wrappers from templates to prevent too much duplicated code
     5  // between the code for different modes.
     6  package main
     7  
     8  import (
     9  	"bytes"
    10  	"fmt"
    11  	"go/format"
    12  	"io/ioutil"
    13  	"strings"
    14  	"text/template"
    15  )
    16  
    17  type Instance struct {
    18  	Bits int
    19  }
    20  
    21  func (m Instance) Pkg() string {
    22  	return strings.ToLower(m.Name())
    23  }
    24  
    25  func (m Instance) Name() string {
    26  	return fmt.Sprintf("SIKEp%d", m.Bits)
    27  }
    28  
    29  func (m Instance) Field() string {
    30  	return fmt.Sprintf("Fp%d", m.Bits)
    31  }
    32  
    33  var (
    34  	Instances = []Instance{
    35  		{Bits: 434},
    36  		{Bits: 503},
    37  		{Bits: 751},
    38  	}
    39  	TemplateWarning = "// Code generated from"
    40  )
    41  
    42  func main() {
    43  	generatePackageFiles()
    44  }
    45  
    46  // Generates instance/sike.go from templates/pkg.templ.go
    47  func generatePackageFiles() {
    48  	tl, err := template.ParseFiles("templates/pkg.templ.go")
    49  	if err != nil {
    50  		panic(err)
    51  	}
    52  
    53  	for _, mode := range Instances {
    54  		buf := new(bytes.Buffer)
    55  		err := tl.Execute(buf, mode)
    56  		if err != nil {
    57  			panic(err)
    58  		}
    59  
    60  		// Formating output code
    61  		code, err := format.Source(buf.Bytes())
    62  		if err != nil {
    63  			panic("error formating code")
    64  		}
    65  
    66  		res := string(code)
    67  		offset := strings.Index(res, TemplateWarning)
    68  		if offset == -1 {
    69  			panic("Missing template warning in pkg.templ.go")
    70  		}
    71  		err = ioutil.WriteFile(mode.Pkg()+"/sike.go", []byte(res[offset:]), 0o644)
    72  		if err != nil {
    73  			panic(err)
    74  		}
    75  	}
    76  }
    77
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