How to Marshal PKCS8 Private Keys in Go 1.5?

Marshalling PKCS8 Private Key in Go

Can PKCS8 private keys be marshaled in Go 1.5? Specifically, is there a method akin to x509.MarshalPKCS1PrivateKey for PKCS8?

Solution:

Despite the absence of a standard function for this task, a custom solution is available:

<code class="go">import (
    "crypto/rsa"
    "crypto/asn1"
    "crypto/x509"
)

type pkcs8Key struct {
    Version             int
    PrivateKeyAlgorithm []asn1.ObjectIdentifier
    PrivateKey          []byte
}


func rsa2pkcs8(key *rsa.PrivateKey) ([]byte, error) {
    var pkey pkcs8Key
    pkey.Version = 0
    pkey.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 1)
    pkey.PrivateKeyAlgorithm[0] = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
    pkey.PrivateKey = x509.MarshalPKCS1PrivateKey(key)

    return asn1.Marshal(pkey)
}</code>

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