Re: [Qemu-devel] [PATCH v3 15/18] crypto: hmac: add af_alg hmac support

["Daniel P. Berrange" <berrange@redhat.com>]

On Sat, Apr 22, 2017 at 03:20:24PM +0800, Longpeng(Mike) wrote:
> Adds afalg-backend hmac support: introduces some private APIs
> firstly, and then intergrates them into qcrypto_hmac_afalg_driver.
> 
> Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
> ---
>  crypto/hash-afalg.c   | 108 +++++++++++++++++++++++++++++++++++++++++++-------
>  crypto/hmac.c         |  27 ++++++++++++-
>  crypto/hmacpriv.h     |   9 +++++
>  include/crypto/hmac.h |   8 ++++
>  4 files changed, 136 insertions(+), 16 deletions(-)
> 
> diff --git a/crypto/hash-afalg.c b/crypto/hash-afalg.c
> index f577c83..0670481 100644
> --- a/crypto/hash-afalg.c
> +++ b/crypto/hash-afalg.c
> @@ -1,5 +1,5 @@
>  /*
> - * QEMU Crypto af_alg-backend hash support
> + * QEMU Crypto af_alg-backend hash/hmac support
>   *
>   * Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
>   *
> @@ -16,10 +16,13 @@
>  #include "qemu-common.h"
>  #include "qapi/error.h"
>  #include "crypto/hash.h"
> +#include "crypto/hmac.h"
>  #include "hashpriv.h"
> +#include "hmacpriv.h"
>  
>  static char *
>  qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,
> +                               bool is_hmac,
>                                 Error **errp)
>  {
>      char *name;
> @@ -55,10 +58,14 @@ qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,
>      }
>  
>      name = g_new0(char, SALG_NAME_LEN_MAX);
> -    ret = snprintf(name, SALG_NAME_LEN_MAX, "%s", alg_name);
> +    if (is_hmac) {
> +        ret = snprintf(name, SALG_NAME_LEN_MAX, "hmac(%s)", alg_name);
> +    } else { /* hash */
> +        ret = snprintf(name, SALG_NAME_LEN_MAX, "%s", alg_name);
> +    }
>      if (ret < 0 || ret >= SALG_NAME_LEN_MAX) {
> -        error_setg(errp, "Build hash name(name='%s') failed",
> -                   alg_name);
> +        error_setg(errp, "Build %s name(name='%s') failed",
> +                   is_hmac ? "hmac" : "hash", alg_name);
>          g_free(name);
>          return NULL;
>      }

Same comments as before about using g_strdup_printf

> diff --git a/crypto/hmac.c b/crypto/hmac.c
> index d040fbb..0a1a6e7 100644
> --- a/crypto/hmac.c
> +++ b/crypto/hmac.c
> @@ -90,16 +90,32 @@ QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
>  {
>      QCryptoHmac *hmac;
>      void *ctx;

Initialize to NULL

> +    Error *err2 = NULL;
> +    QCryptoHmacDriver *drv;
> +
> +#ifdef CONFIG_AF_ALG
> +    ctx = qcrypto_afalg_hmac_ctx_new(alg, key, nkey, &err2);
> +    if (ctx) {
> +        drv = &qcrypto_hmac_afalg_driver;
> +        goto set_hmac;

Drop the goto

> +    }
> +#endif
>

And we can just add 'if (!ctx)' here

>      ctx = qcrypto_hmac_ctx_new(alg, key, nkey, errp);
>      if (ctx == NULL) {
>          return NULL;
>      }
>  
> +    drv = &qcrypto_hmac_lib_driver;
> +    error_free(err2);
> +
> +#ifdef CONFIG_AF_ALG
> +set_hmac:
> +#endif
>      hmac = g_new0(QCryptoHmac, 1);
>      hmac->alg = alg;
>      hmac->opaque = ctx;
> -    hmac->driver = (void *)&qcrypto_hmac_lib_driver;
> +    hmac->driver = (void *)drv;
>  
>      return hmac;
>  }

Regards,
Daniel
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