Re: [PATCH RFC 0/2] crypto: Introduce Public Key Encryption API

[Jean Delvare]

I have nothing to do with this, please drop me from Cc.

Thanks,
Jean

On Thu, 30 Apr 2015 15:36:47 -0700, Tadeusz Struk wrote:
> This patch set introduces a Public Key Encryption API.
> What is proposed is a new crypto type called crypto_pke_type
> plus new struct pke_alg and struct pke_tfm together with number
> of helper functions to register pke type algorithms and allocate
> tfm instances. This is to make it similar to how the existing crypto
> API works for the ablkcipher, ahash, and aead types.
> The operations the new interface will allow to provide are:
> 
> 	int (*sign)(struct pke_request *pkereq);
> 	int (*verify)(struct pke_request *pkereq);
> 	int (*encrypt)(struct pke_request *pkereq);
> 	int (*decrypt)(struct pke_request *pkereq);
> 
> The benefits it gives comparing to the struct public_key_algorithm
> interface are:
> - drivers can add many implementations of RSA or DSA
>   algorithms and user will allocate instances (tfms) of these, base on
>   algorithm priority, in the same way as it is with the symmetric ciphers.
> - the new interface allows for asynchronous implementations that
>   can use crypto hardware to offload the calculations to.
> - integrating it with linux crypto api allows using all its benefits
>   i.e. managing algorithms using NETLINK_CRYPTO, monitoring implementations
>   using /proc/crypto. etc
> 
> New helper functions have been added to allocate pke_tfm instances
> and invoke the operations to make it easier to use.
> For instance to verify a public_signature against a public_key using
> the RSA algorithm a user would do:
> 
> 	struct crypto_pke *tfm = crypto_alloc_pke("rsa", 0, 0);
> 	struct pke_request *req = pke_request_alloc(tfm, GFP_KERNEL);
> 	pke_request_set_crypt(req, pub_key, signature);
> 	int ret = crypto_pke_verify(req);
> 	pke_request_free(req);
> 	crypto_free_pke(tfm);
> 	return ret;
> 
> Additionally existing public_key and rsa code have been reworked to
> use the new interface for verifying signed modules.
> As part of the rework the enum pkey_algo has been removed as the algorithm
> to allocate will be indicated by a string - for instance "rsa" or "dsa",
> similarly as it is with the symmetric algs e.g. "aes".
> It will also make it easier to extend in the future when new algorithms
> will be added.
> ---
> Tadeusz Struk (2):
>       crypto: add PKE API
>       crypto: RSA: KEYS: convert rsa and public key to new PKE API
> 
> 
>  Documentation/crypto/asymmetric-keys.txt  |   10 +-
>  crypto/Kconfig                            |    6 +
>  crypto/Makefile                           |    1 
>  crypto/asymmetric_keys/Kconfig            |    1 
>  crypto/asymmetric_keys/pkcs7_parser.c     |    4 -
>  crypto/asymmetric_keys/pkcs7_trust.c      |    2 
>  crypto/asymmetric_keys/pkcs7_verify.c     |    5 -
>  crypto/asymmetric_keys/public_key.c       |   73 +++++++----
>  crypto/asymmetric_keys/public_key.h       |   36 -----
>  crypto/asymmetric_keys/rsa.c              |   47 ++++++-
>  crypto/asymmetric_keys/x509_cert_parser.c |   14 ++
>  crypto/asymmetric_keys/x509_public_key.c  |   14 +-
>  crypto/crypto_user.c                      |   23 +++
>  crypto/pke.c                              |  114 +++++++++++++++++
>  include/crypto/algapi.h                   |    6 +
>  include/crypto/public_key.h               |   24 +---
>  include/linux/crypto.h                    |  191 +++++++++++++++++++++++++++++
>  include/linux/cryptouser.h                |    7 +
>  kernel/module_signing.c                   |    9 +
>  19 files changed, 471 insertions(+), 116 deletions(-)
>  delete mode 100644 crypto/asymmetric_keys/public_key.h
>  create mode 100644 crypto/pke.c
> 
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