How to Marshal a PKCS8 Private Key in Go 1.5?

Marshalling a PKCS8 Private Key in Go

Go 1.5 lacks a standard function for marshalling PKCS8 private keys. However, we can leverage a custom solution instead.

To marshal a PKCS8 key, we define a custom structure pkcs8Key that represents the PKCS8 format. It includes fields for the version, private key algorithm, and the actual private key bytes.

For RSA keys, we use the rsa2pkcs8 function to convert them to PKCS8 format. This function sets the version to 0, assigns the appropriate private key algorithm OID, and marshals the PKCS1-formatted private key.

<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 solution allows us to marshal PKCS8 private keys programmatically, even though Go lacks an official function for this purpose.

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