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x/crypto: Support for sect571r1 in elliptic #36712

pramoths opened this issue Jan 23, 2020 · 2 comments

x/crypto: Support for sect571r1 in elliptic #36712

pramoths opened this issue Jan 23, 2020 · 2 comments


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@pramoths pramoths commented Jan 23, 2020

What version of Go are you using (go version)?

$ go version
go version go1.10.3 windows/amd64

Does this issue reproduce with the latest release?


What operating system and processor architecture are you using (go env)?

go env Output
$ go env
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\----\AppData\Local\go-build
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=C:\Users\----\go
set GOROOT=C:\Go
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set CXX=g++
set CGO_CFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\----\AppData\Local\Temp\go-build094907166=/tmp/go-build -gno-record-gcc-switches

What did you do?

I am trying to import privatekey generated with sunec 'sect571r1'

func decodePrivateKeyFromString(pemEncoded string) (*ecdsa.PrivateKey, error) {
val, _ := base64.StdEncoding.DecodeString(pemEncoded)
privateKey, err := x509.ParsePKCS8PrivateKey(val)
if err != nil {
return nil, errors.New("Failed to parse ECDSA private key")
switch privateKey := privateKey.(type) {
case *ecdsa.PrivateKey:
return privateKey, nil
return nil, errors.New("Unsupported public key type")

What did you expect to see?

To get the private key

What did you see instead?

x509: unknown elliptic curve

@toothrot toothrot changed the title Support for sect571r1 in elliptic x/crypto: Support for sect571r1 in elliptic Jan 23, 2020
@gopherbot gopherbot added this to the Unreleased milestone Jan 23, 2020
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@toothrot toothrot commented Jan 23, 2020

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@FiloSottile FiloSottile commented Jan 23, 2020

sect571r1 aka B-571 is a rarely used binary curve. Binary curves have a worse security track record than ones on prime fields, and anyway implementing a new curve involves a lot of complexity which we are not going to carry unless it would be very widely used.

@golang golang locked and limited conversation to collaborators Jan 22, 2021
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4 participants