linux-kernel - Re: [PATCH 00/22] KEYS: Support TPM-wrapped key and crypto ops

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Date:   Tue, 18 Sep 2018 07:59:53 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     David Howells <dhowells@...hat.com>, jmorris@...ei.org
Cc:     denkenz@...il.com, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/22] KEYS: Support TPM-wrapped key and crypto ops

On Wed, 2018-09-05 at 22:54 +0100, David Howells wrote:
> 
> Example usage for a PKCS#8 blob:
> 
>         j=`openssl pkcs8 -in private_key.pem -topk8 -nocrypt -outform DER | \
>             keyctl padd asymmetric foo @s`
> 
> Example usage for a TPM wrapped blob:
> 
>         openssl genrsa -out /tmp/privkey.foo.pem 2048
>         create_tpm_key -s 2048 -w /tmp/privkey.foo.pem /tmp/privkey.foo.tpm
>         j=`openssl asn1parse -inform pem -in /tmp/privkey.foo.tpm -noout |
>             keyctl padd asymmetric foo @s`

Those examples aren't equivalent. For the PKCS#8 blob you are first
using openssl to convert from an encrypted PKCS#8 PEM to unencrypted
DER, presumably because you haven't added decryption support (or base64
decode) to keyctl yet.

For the TPM example though, you are also showing the *generation* of
the key, and importing it into the TPM. And then I'm confused by the
'openssl asn1parse' line there... what is that actually doing? If I run
it on a '-----BEGIN TSS KEY BLOB-----' file I have lying around, I get
no output at all.

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