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encoding/asn1: Unmarshal allows arbitrary numbers of leading zeros when decoding integers #12622

alex opened this issue Sep 15, 2015 · 2 comments


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@alex alex commented Sep 15, 2015


package main

import (

func main() {
    data := &struct {
        A int64
        B *big.Int
    _, err := asn1.Unmarshal([]byte{0x30, 0x0e, 0x02, 0x05, 0x00, 0x00, 0x00, 0x00, 0x02, 0x02, 0x05, 0x00, 0x00, 0x00, 0x00, 0x01}, data)
    if err != nil {
    fmt.Printf("%#v\n", data)

Per the DER spec, INTEGER must be minimally encoded.

$ go version
go version go1.5.1 darwin/amd64
@bradfitz bradfitz added this to the Go1.6 milestone Sep 15, 2015
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@gopherbot gopherbot commented Nov 16, 2015

CL mentions this issue.

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@gopherbot gopherbot commented Nov 18, 2015

CL mentions this issue.

@bradfitz bradfitz closed this in 7c20ea9 Dec 1, 2015
@golang golang locked and limited conversation to collaborators Dec 1, 2016
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