x/crypto/ssh: ParsePrivateKey gives unintuitive error message for encrypted keys #6650
Description
key, err := ioutil.ReadFile("/home/rog/.ssh/id_rsa")
if err != nil {
log.Fatal(err)
}
_, err = ssh.ParsePrivateKey(key)
if err != nil {
log.Fatalf("cannot parse ssh private key: %v", err)
}
ParsePrivateKey fails with an error like this:
asn1: structure error: tags don't match (16 vs {class:1 tag:28 length:11
isCompound:true}) {optional:false explicit:false application:false
defaultValue:<nil> tag:<nil> stringType:0 set:false omitEmpty:false}
pkcs1PrivateKey @2
I'd expect to see an error that complains about the fact
that the private key is encrypted.