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64 lines
1.8 KiB
64 lines
1.8 KiB
9 years ago
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// Copyright 2015 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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// This file is ignored during the regular build due to the following build tag.
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// It is called by go generate and used to automatically generate pre-computed
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// tables used to accelerate operations.
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// +build ignore
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package main
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import (
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"bytes"
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"compress/zlib"
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"encoding/base64"
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"fmt"
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"log"
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"os"
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"github.com/btcsuite/btcd/btcec"
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)
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func main() {
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fi, err := os.Create("secp256k1.go")
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if err != nil {
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log.Fatal(err)
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}
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defer fi.Close()
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// Compress the serialized byte points.
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serialized := btcec.S256().SerializedBytePoints()
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var compressed bytes.Buffer
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w := zlib.NewWriter(&compressed)
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if _, err := w.Write(serialized); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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w.Close()
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// Encode the compressed byte points with base64.
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encoded := make([]byte, base64.StdEncoding.EncodedLen(compressed.Len()))
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base64.StdEncoding.Encode(encoded, compressed.Bytes())
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fmt.Fprintln(fi, "// Copyright (c) 2015 The btcsuite developers")
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fmt.Fprintln(fi, "// Use of this source code is governed by an ISC")
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fmt.Fprintln(fi, "// license that can be found in the LICENSE file.")
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fmt.Fprintln(fi)
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fmt.Fprintln(fi, "package btcec")
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fmt.Fprintln(fi)
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fmt.Fprintln(fi, "// Auto-generated file (see genprecomps.go)")
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fmt.Fprintln(fi, "// DO NOT EDIT")
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fmt.Fprintln(fi)
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fmt.Fprintf(fi, "var secp256k1BytePoints = %q\n", string(encoded))
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a1, b1, a2, b2 := btcec.S256().EndomorphismVectors()
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fmt.Println("The following values are the computed linearly " +
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"independent vectors needed to make use of the secp256k1 " +
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"endomorphism:")
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fmt.Printf("a1: %x\n", a1)
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fmt.Printf("b1: %x\n", b1)
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fmt.Printf("a2: %x\n", a2)
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fmt.Printf("b2: %x\n", b2)
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}
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