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crypto/tls: Sometimes fails to parse private key #17279

Description

@Foosvald

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

go version go1.7 darwin/amd64

What did you do?

I'm trying to load X.509 key pairs using tls.LoadX509KeyPair. The key pairs have been generated using node-forge, and are generated using the same options each time. In most cases tls.LoadX509KeyPair works and loads the key pair, but for some of the key pairs it cannot parse the private key. All of the generated keys are parsed correctly by openssl though.

$ openssl rsa -in broken.key -check -noout
RSA key ok

This is the program I run:

package main

import (
    "crypto/tls"
    "log"
)

func main() {
    _, err := tls.LoadX509KeyPair("broken.pem", "broken.key")
    if(err != nil) {
        log.Fatal(err)
    }
    log.Print("Go loaded key successfully")
}

I've also attached both the key pair that is not working, and a key pair that is working (and is correctly opened by tls.LoadX509KeyPair) which has been generated using the same options.
keys.zip

What did you expect to see?

2016/09/29 14:31:49 Go loaded key successfully

What did you see instead?

2016/09/29 14:32:19 tls: failed to parse private key
exit status 1

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