Re: Missing EVP_PKEY method to set engine?

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Re: Missing EVP_PKEY method to set engine?

Dr. Stephen Henson
On Fri, Sep 29, 2017, Blumenthal, Uri - 0553 - MITLL wrote:

> Apologies in advance for cross-posting ??? but I???m not sure which of the two mailing lists this belongs to.
>
> A key (say, private key) is loaded from the pkcs11 engine via privkey = ENGINE_load_private_key(engine, <whatever else>); and this operation succeeds.
>
> However the resulting key handle has its engine == NULL. I looked for a method or a macro to explicitly set that value to the pointer to the engine that this key is bound to, but couldn???t find any. I define new methods such as pkcs11_pkey_rsa_decrypt(), and  try to make OpenSSL aware of them via:
>
>         EVP_PKEY_METHOD *orig_pmeth = EVP_PKEY_meth_find(EVP_PKEY_RSA);
>
>    EVP_PKEY_METHOD *pmeth = EVP_PKEY_meth_new(EVP_PKEY_RSA, EVP_PKEY_FLAG_AUTOARGLEN);
>
>    EVP_PKEY_meth_copy(pmeth, orig_pmeth);
>
>    EVP_PKEY_meth_get_decrypt(orig_pmeth, &pdecr_init, &pdecr);
>
>    EVP_PKEY_meth_set_decrypt(pmeth, pdecr_init, pkcs11_pkey_rsa_decrypt);
>

There doesn't seem to be any easy way to do that for an existing method. If
the ENGINE has its own ASN.1 method things become easier.

A workaround might be to use a copy of an existing A workaround might be to
create a copy of an existing ASN.1 method but I've not tried that.

>
> In ENGINE_set_pkey_meths(engine, pkey_meths) what should pkey_meths() actually be? Is it documented?
>
>  

Not currently but it similar to the cipher/digest functions but handles
EVP_PKEY_METHOD instead.

Steve.
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Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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Re: Missing EVP_PKEY method to set engine?

Blumenthal, Uri - 0553 - MITLL
Thank you! 

I observe that in 1.1.x everything's fine - the structure evp_pkey_methods_st is opaque, but both getters and setters are defined and available. 

In 1.0.2 the structure is already opaque, the setters are present, but some getters are absent. Which makes it quite hard to work with members of this structure.

I think this is a bug, and two possible remedies INHO are: add getter functions for the members, or add/move this structure from evp-int.h to evp.h (so it's no longer opaque).

What is your opinion? 

Thanks!

Regards,
Uri

Sent from my iPhone

On Oct 1, 2017, at 18:54, Dr. Stephen Henson <[hidden email]> wrote:

On Fri, Sep 29, 2017, Blumenthal, Uri - 0553 - MITLL wrote:

Apologies in advance for cross-posting ??? but I???m not sure which of the two mailing lists this belongs to.

A key (say, private key) is loaded from the pkcs11 engine via privkey = ENGINE_load_private_key(engine, <whatever else>); and this operation succeeds.

However the resulting key handle has its engine == NULL. I looked for a method or a macro to explicitly set that value to the pointer to the engine that this key is bound to, but couldn???t find any. I define new methods such as pkcs11_pkey_rsa_decrypt(), and  try to make OpenSSL aware of them via:

        EVP_PKEY_METHOD *orig_pmeth = EVP_PKEY_meth_find(EVP_PKEY_RSA);

   EVP_PKEY_METHOD *pmeth = EVP_PKEY_meth_new(EVP_PKEY_RSA, EVP_PKEY_FLAG_AUTOARGLEN);

   EVP_PKEY_meth_copy(pmeth, orig_pmeth);

   EVP_PKEY_meth_get_decrypt(orig_pmeth, &pdecr_init, &pdecr);

   EVP_PKEY_meth_set_decrypt(pmeth, pdecr_init, pkcs11_pkey_rsa_decrypt);


There doesn't seem to be any easy way to do that for an existing method. If
the ENGINE has its own ASN.1 method things become easier.

A workaround might be to use a copy of an existing A workaround might be to
create a copy of an existing ASN.1 method but I've not tried that.


In ENGINE_set_pkey_meths(engine, pkey_meths) what should pkey_meths() actually be? Is it documented?



Not currently but it similar to the cipher/digest functions but handles
EVP_PKEY_METHOD instead.

Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
--
openssl-users mailing list
To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users

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