How Can I Marshal PKCS8 Private Keys in Go 1.5?

Marshalling PKCS8 Private Keys in Go

The question arises regarding the availability of a method to marshal PKCS8 private keys in Go 1.5. A similar function, such as x509.MarshalPKCS1PrivateKey, is sought after.

Custom Solution

Interestingly, there is no standard function for marshalling PKCS8 private keys in Go. However, a custom solution is provided below:

<code class="go">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>

This custom function, rsa2pkcs8, can be used to marshal PKCS8 private keys in Go 1.5.

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