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    Subject[RFC v2 1/7] integrity: added digest calculation function
    Date
    There are several functions, that need to calculate digest.
    This patch adds common function for use by integrity subsystem.

    Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
    ---
    security/integrity/digsig.c | 31 +++++++++++++++++++++++++++++--
    security/integrity/integrity.h | 3 +++
    2 files changed, 32 insertions(+), 2 deletions(-)

    diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
    index 2dc167d..61a0c92 100644
    --- a/security/integrity/digsig.c
    +++ b/security/integrity/digsig.c
    @@ -13,9 +13,9 @@
    #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

    #include <linux/err.h>
    -#include <linux/rbtree.h>
    #include <linux/key-type.h>
    #include <linux/digsig.h>
    +#include <crypto/hash.h>

    #include "integrity.h"

    @@ -28,7 +28,7 @@ static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
    };

    int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
    - const char *digest, int digestlen)
    + const char *digest, int digestlen)
    {
    if (id >= INTEGRITY_KEYRING_MAX)
    return -EINVAL;
    @@ -46,3 +46,30 @@ int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,

    return digsig_verify(keyring[id], sig, siglen, digest, digestlen);
    }
    +
    +int integrity_calc_digest(const char *algo, const void *data, const int len,
    + char *digest)
    +{
    + int rc = -ENOMEM;
    + struct crypto_shash *tfm;
    +
    + tfm = crypto_alloc_shash(algo, 0, 0);
    + if (IS_ERR(tfm)) {
    + rc = PTR_ERR(tfm);
    + pr_err("Can not allocate %s (reason: %d)\n", algo, rc);
    + return rc;
    + } else {
    + struct {
    + struct shash_desc shash;
    + char ctx[crypto_shash_descsize(tfm)];
    + } desc;
    +
    + desc.shash.tfm = tfm;
    + desc.shash.flags = 0;
    +
    + rc = crypto_shash_digest(&desc.shash, data, len, digest);
    + }
    +
    + crypto_free_shash(tfm);
    + return rc;
    +}
    diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
    index e21362a..48ee2d4 100644
    --- a/security/integrity/integrity.h
    +++ b/security/integrity/integrity.h
    @@ -59,6 +59,9 @@ struct integrity_iint_cache *integrity_iint_find(struct inode *inode);

    #ifdef CONFIG_INTEGRITY_SIGNATURE

    +int integrity_calc_digest(const char *algo, const void *data, const int len,
    + char *digest);
    +
    int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
    const char *digest, int digestlen);

    --
    1.7.9.5


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