CODEWITHSUNDEEP
go
codefinger
codefinger

Reputation: 10318

How do I parse an RSA public key in Go?

Why do I get the error ssh: short read from the following code:

package main

import (
    "golang.org/x/crypto/ssh"
    "testing"
)

func TestPublicKeyParsing(t *testing.T) {
    key := "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDhZgLqiZYDKCWhyi2gUXIRwIPyMSyXZ6yrwsm3PYfIvFB60kVlNgqDpPVhWoH6eRfaQ1y/xbg4nClZmHEDTvLbTQ1ZoQzzjZ7zvM6aQ4nADmKcCYswEuU94axouVjsHNyMLfOkPXuGec0fChwQ2JDh/B9LCiSDxyhCOgHvETXGXsyBMKjn498iPjJ6snzk35dy5wPZRz41g3dLaygF+wYAT791u/JchHQL7OP7RoNgby+RM16SYZs1tgQVkfU//o+AyTarWYLVDpFU6HPPenE4xEXhbgqd7x3wSNPBsMvY8Zjcu3kdHtboJidyMtKeD8ghV/T24kME58TW15T8Eg8R"

    _, err := ssh.ParsePublicKey([]byte(key))
    if err != nil {
        t.Errorf("ERROR! %s", err)
    }
}

Is the key string in the wrong format?

What is the correct format for the public key?

Upvotes: 9

Views: 8178

Answers (1)

Peter
Peter

Reputation: 31681

This looks like the authorized_keys format, which you can parse with ssh.ParseAuthorizedKey:

package main

import (
    "golang.org/x/crypto/ssh"
    "testing"
)

func TestPublicKeyParsing(t *testing.T) {
    key := "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDhZgLqiZYDKCWhyi2gUXIRwIPyMSyXZ6yrwsm3PYfIvFB60kVlNgqDpPVhWoH6eRfaQ1y/xbg4nClZmHEDTvLbTQ1ZoQzzjZ7zvM6aQ4nADmKcCYswEuU94axouVjsHNyMLfOkPXuGec0fChwQ2JDh/B9LCiSDxyhCOgHvETXGXsyBMKjn498iPjJ6snzk35dy5wPZRz41g3dLaygF+wYAT791u/JchHQL7OP7RoNgby+RM16SYZs1tgQVkfU//o+AyTarWYLVDpFU6HPPenE4xEXhbgqd7x3wSNPBsMvY8Zjcu3kdHtboJidyMtKeD8ghV/T24kME58TW15T8Eg8R"

    parsedKey, _, _, _, err := ssh.ParseAuthorizedKey([]byte(key))
    if err != nil {
        t.Errorf("ERROR! %s", err)
    }
}

Upvotes: 16

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