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Date: Tue, 28 Apr 2009 21:28:13 -0400
From: Jarod Wilson <jarod@...hat.com>
To: linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Herbert Xu <herbert@...dor.apana.org.au>,
Neil Horman <nhorman@...driver.com>
Subject: [PATCH 1/2] add infrastructure for ansi_cprng self-tests
Add some necessary infrastructure to make it possible to run
self-tests for ansi_cprng. The bits are likely very specific
to the ANSI X9.31 CPRNG in AES mode, and thus perhaps should
be named more specifically if/when we grow additional CPRNG
support...
Successfully tested against the cryptodev-2.6 tree and a
Red Hat Enterprise Linux 5.x kernel with the follow-on
patch that adds the actual test vectors.
Signed-off-by: Jarod Wilson <jarod@...hat.com>
---
crypto/testmgr.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
crypto/testmgr.h | 12 +++++++
2 files changed, 101 insertions(+), 0 deletions(-)
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index d0cc85c..6330081 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -19,6 +19,7 @@
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <crypto/rng.h>
#include "internal.h"
#include "testmgr.h"
@@ -84,6 +85,11 @@ struct hash_test_suite {
unsigned int count;
};
+struct cprng_test_suite {
+ struct cprng_testvec *vecs;
+ unsigned int count;
+};
+
struct alg_test_desc {
const char *alg;
int (*test)(const struct alg_test_desc *desc, const char *driver,
@@ -95,6 +101,7 @@ struct alg_test_desc {
struct comp_test_suite comp;
struct pcomp_test_suite pcomp;
struct hash_test_suite hash;
+ struct cprng_test_suite cprng;
} suite;
};
@@ -1089,6 +1096,68 @@ static int test_pcomp(struct crypto_pcomp *tfm,
return 0;
}
+
+static int test_cprng(struct crypto_rng *tfm, struct cprng_testvec *template,
+ unsigned int tcount)
+{
+ const char *algo = crypto_tfm_alg_driver_name(crypto_rng_tfm(tfm));
+ int err, i, j, seedsize;
+ u8 *seed;
+ char result[32];
+
+ seedsize = crypto_rng_seedsize(tfm);
+
+ seed = kmalloc(seedsize, GFP_KERNEL);
+ if (!seed) {
+ printk(KERN_ERR "alg: cprng: Failed to allocate seed space "
+ "for %s\n", algo);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < tcount; i++) {
+ memset(result, 0, 32);
+
+ memcpy(seed, template[i].v, template[i].vlen);
+ memcpy(seed + template[i].vlen, template[i].key,
+ template[i].klen);
+ memcpy(seed + template[i].vlen + template[i].klen,
+ template[i].dt, template[i].dtlen);
+
+ err = crypto_rng_reset(tfm, seed, seedsize);
+ if (err) {
+ printk(KERN_ERR "alg: cprng: Failed to reset rng "
+ "for %s\n", algo);
+ goto out;
+ }
+
+ for (j = 0; j < template[i].loops; j++) {
+ err = crypto_rng_get_bytes(tfm, result,
+ template[i].rlen);
+ if (err != template[i].rlen) {
+ printk(KERN_ERR "alg: cprng: Failed to obtain "
+ "the correct amount of random data for "
+ "%s (requested %d, got %d)\n", algo,
+ template[i].rlen, err);
+ goto out;
+ }
+ }
+
+ err = memcmp(result, template[i].result,
+ template[i].rlen);
+ if (err) {
+ printk(KERN_ERR "alg: cprng: Test %d failed for %s\n",
+ i, algo);
+ hexdump(result, template[i].rlen);
+ err = -EINVAL;
+ goto out;
+ }
+ }
+
+out:
+ kfree(seed);
+ return err;
+}
+
static int alg_test_aead(const struct alg_test_desc *desc, const char *driver,
u32 type, u32 mask)
{
@@ -1288,6 +1357,26 @@ out:
return err;
}
+static int alg_test_cprng(const struct alg_test_desc *desc, const char *driver,
+ u32 type, u32 mask)
+{
+ struct crypto_rng *rng;
+ int err;
+
+ rng = crypto_alloc_rng(driver, type, mask);
+ if (IS_ERR(rng)) {
+ printk(KERN_ERR "alg: cprng: Failed to load transform for %s: "
+ "%ld\n", driver, PTR_ERR(rng));
+ return PTR_ERR(rng);
+ }
+
+ err = test_cprng(rng, desc->suite.cprng.vecs, desc->suite.cprng.count);
+
+ crypto_free_rng(rng);
+
+ return err;
+}
+
/* Please keep this list sorted by algorithm name. */
static const struct alg_test_desc alg_test_descs[] = {
{
diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 5add651..13d5a61 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -70,6 +70,18 @@ struct aead_testvec {
unsigned short rlen;
};
+struct cprng_testvec {
+ char *key;
+ char *dt;
+ char *v;
+ char *result;
+ unsigned char klen;
+ unsigned short dtlen;
+ unsigned short vlen;
+ unsigned short rlen;
+ unsigned short loops;
+};
+
static char zeroed_string[48];
/*
--
Jarod Wilson
jarod@...hat.com
--
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