How to Marshal PKCS8 Private Keys in Go?

Marshaling PKCS8 Private Keys in Go

In Go, the question of whether there's a convenient way to marshal PKCS8 private keys in version 1.5 arises. Similar to the x509.MarshalPKCS1PrivateKey function, developers seek an efficient mechanism for converting private keys into serialized data.

While Go does not provide a built-in function for this specific purpose, there exists a custom solution that addresses this requirement:

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

func rsa2pkcs8(key *rsa.PrivateKey) ([]byte, error) {
    var pkey pkcs8Key
    pkey.Version = 0 // Default version for PKCS8
    pkey.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 1)
    pkey.PrivateKeyAlgorithm[0] = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1} // RSA encryption algorithm OID
    pkey.PrivateKey = x509.MarshalPKCS1PrivateKey(key)

    return asn1.Marshal(pkey)
}

This custom function, rsa2pkcs8, allows you to convert a rsa.PrivateKey object into a PKCS8-encoded byte array. It sets the version to 0, specifies the RSA encryption algorithm OID, and embeds the marshaled PKCS1 private key into the PrivateKey field of the pkcs8Key structure. By calling asn1.Marshal on this structure, you obtain the serialized data representing the PKCS8 private key.

Utilizing this solution empowers Go developers with the ability to marshal PKCS8 private keys, providing them with a convenient utility for various cryptographic operations and data exchange scenarios.

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