crypto: Add userspace report for shash type algorithms

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 28 insertions, 0 deletions

diff --git a/crypto/shash.c b/crypto/shash.c
index 76f74b963151..ea8a9c6e21e3 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -17,6 +17,8 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/seq_file.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
 
 #include "internal.h"
 
@@ -522,6 +524,24 @@ static unsigned int crypto_shash_extsize(struct crypto_alg *alg)
         return alg->cra_ctxsize;
 }
 
+static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+        struct crypto_report_hash rhash;
+        struct shash_alg *salg = __crypto_shash_alg(alg);
+
+        snprintf(rhash.type, CRYPTO_MAX_ALG_NAME, "%s", "shash");
+        rhash.blocksize = alg->cra_blocksize;
+        rhash.digestsize = salg->digestsize;
+
+        NLA_PUT(skb, CRYPTOCFGA_REPORT_HASH,
+                sizeof(struct crypto_report_hash), &rhash);
+
+        return 0;
+
+nla_put_failure:
+        return -EMSGSIZE;
+}
+
 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
         __attribute__ ((unused));
 static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
@@ -541,6 +561,7 @@ static const struct crypto_type crypto_shash_type = {
 #ifdef CONFIG_PROC_FS
         .show = crypto_shash_show,
 #endif
+        .report = crypto_shash_report,
         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
         .maskset = CRYPTO_ALG_TYPE_MASK,
         .type = CRYPTO_ALG_TYPE_SHASH,
diff --git a/include/linux/cryptouser.h b/include/linux/cryptouser.h
index 7a849b4c3b82..ee4688221975 100644
--- a/include/linux/cryptouser.h
+++ b/include/linux/cryptouser.h
@@ -37,6 +37,7 @@ enum crypto_attr_type_t {
         CRYPTOCFGA_UNSPEC,
         CRYPTOCFGA_PRIORITY_VAL,        /* __u32 */
         CRYPTOCFGA_REPORT_LARVAL,       /* struct crypto_report_larval */
+        CRYPTOCFGA_REPORT_HASH,         /* struct crypto_report_hash */
         __CRYPTOCFGA_MAX
 
 #define CRYPTOCFGA_MAX (__CRYPTOCFGA_MAX - 1)
@@ -55,3 +56,9 @@ struct crypto_user_alg {
 struct crypto_report_larval {
         char type[CRYPTO_MAX_NAME];
 };
+
+struct crypto_report_hash {
+        char type[CRYPTO_MAX_NAME];
+        unsigned int blocksize;
+        unsigned int digestsize;
+};