github.com/palcoin-project/palcd@v1.0.0/btcec/genprecomps.go (about)

     1  // Copyright 2015 The btcsuite developers
     2  // Use of this source code is governed by an ISC
     3  // license that can be found in the LICENSE file.
     4  
     5  // This file is ignored during the regular build due to the following build tag.
     6  // It is called by go generate and used to automatically generate pre-computed
     7  // tables used to accelerate operations.
     8  //go:build ignore
     9  // +build ignore
    10  
    11  package main
    12  
    13  import (
    14  	"bytes"
    15  	"compress/zlib"
    16  	"encoding/base64"
    17  	"fmt"
    18  	"log"
    19  	"os"
    20  
    21  	"github.com/palcoin-project/palcd/btcec"
    22  )
    23  
    24  func main() {
    25  	fi, err := os.Create("secp256k1.go")
    26  	if err != nil {
    27  		log.Fatal(err)
    28  	}
    29  	defer fi.Close()
    30  
    31  	// Compress the serialized byte points.
    32  	serialized := btcec.S256().SerializedBytePoints()
    33  	var compressed bytes.Buffer
    34  	w := zlib.NewWriter(&compressed)
    35  	if _, err := w.Write(serialized); err != nil {
    36  		fmt.Println(err)
    37  		os.Exit(1)
    38  	}
    39  	w.Close()
    40  
    41  	// Encode the compressed byte points with base64.
    42  	encoded := make([]byte, base64.StdEncoding.EncodedLen(compressed.Len()))
    43  	base64.StdEncoding.Encode(encoded, compressed.Bytes())
    44  
    45  	fmt.Fprintln(fi, "// Copyright (c) 2015 The btcsuite developers")
    46  	fmt.Fprintln(fi, "// Use of this source code is governed by an ISC")
    47  	fmt.Fprintln(fi, "// license that can be found in the LICENSE file.")
    48  	fmt.Fprintln(fi)
    49  	fmt.Fprintln(fi, "package btcec")
    50  	fmt.Fprintln(fi)
    51  	fmt.Fprintln(fi, "// Auto-generated file (see genprecomps.go)")
    52  	fmt.Fprintln(fi, "// DO NOT EDIT")
    53  	fmt.Fprintln(fi)
    54  	fmt.Fprintf(fi, "var secp256k1BytePoints = %q\n", string(encoded))
    55  
    56  	a1, b1, a2, b2 := btcec.S256().EndomorphismVectors()
    57  	fmt.Println("The following values are the computed linearly " +
    58  		"independent vectors needed to make use of the secp256k1 " +
    59  		"endomorphism:")
    60  	fmt.Printf("a1: %x\n", a1)
    61  	fmt.Printf("b1: %x\n", b1)
    62  	fmt.Printf("a2: %x\n", a2)
    63  	fmt.Printf("b2: %x\n", b2)
    64  }