How can I marshal a PKCS8 private key in Go 1.5?

Marshaling a PKCS8 Private Key in Go 1.5

In Go, the x509 package provides functionality for marshaling PKCS1 private keys, but there is no standard function for marshaling PKCS8 private keys. Here's a way to marshal a PKCS8 private key in Go 1.5:

Define a pkcs8Key struct consisting of the following fields:

• Version: Integer representing the version of the PKCS8 key
• PrivateKeyAlgorithm: Slice of ASN.1 Object Identifiers representing the private key algorithm
• PrivateKey: Bytes representing the private key

Create a function (rsa2pkcs8) for converting an RSA private key into a PKCS8 representation:

• Set the Version field of pkcs8Key to 0
• Set the PrivateKeyAlgorithm field to reflect the desired algorithm, e.g., 1, 2, 840, 113549, 1, 1, 1 for RSA
• Marshal the RSA private key using x509.MarshalPKCS1PrivateKey and assign it to the PrivateKey field
• Marshal the pkcs8Key struct using asn1.Marshal

By implementing this function, you can convert an RSA private key into a PKCS8 representation, enabling you to work with PKCS8 keys in your Go applications.

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