[PATCH v29 05/12] crypto: DRBG - externalize DRBG functions for LRNG

Stephan Müller
2020-01-20T07:01:37Z

This patch allows several DRBG functions to be called by the LRNG kernel
code paths outside the drbg.c file.

CC: "Eric W. Biederman" <ebiederm@xmission.com>
CC: "Alexander E. Patrakov" <patrakov@gmail.com>
CC: "Ahmed S. Darwish" <darwish.07@gmail.com>
CC: "Theodore Y. Ts'o" <tytso@mit.edu>
CC: Willy Tarreau <w@1wt.eu>
CC: Matthew Garrett <mjg59@srcf.ucam.org>
CC: Vito Caputo <vcaputo@pengaru.com>
CC: Andreas Dilger <adilger.kernel@dilger.ca>
CC: Jan Kara <jack@suse.cz>
CC: Ray Strode <rstrode@redhat.com>
CC: William Jon McCann <mccann@jhu.edu>
CC: zhangjs <zachary@baishancloud.com>
CC: Andy Lutomirski <luto@kernel.org>
CC: Florian Weimer <fweimer@redhat.com>
CC: Lennart Poettering <mzxreary@0pointer.de>
CC: Nicolai Stange <nstange@suse.de>
Reviewed-by: Roman Drahtmueller <draht@schaltsekun.de>
Tested-by: Roman Drahtmüller <draht@schaltsekun.de>
Tested-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Tested-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
---
crypto/drbg.c | 16 ++++++++++------
include/crypto/drbg.h | 7 +++++++
2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/crypto/drbg.c b/crypto/drbg.c
index b6929eb5f565..5561dd0f09e1 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -113,7 +113,7 @@
* the SHA256 / AES 256 over other ciphers. Thus, the favored
* DRBGs are the latest entries in this array.
*/
-static const struct drbg_core drbg_cores[] = {
+const struct drbg_core drbg_cores[] = {
#ifdef CONFIG_CRYPTO_DRBG_CTR
{
.flags = DRBG_CTR | DRBG_STRENGTH128,
@@ -190,6 +190,7 @@ static const struct drbg_core drbg_cores[] = {
},
#endif /* CONFIG_CRYPTO_DRBG_HMAC */
};
+EXPORT_SYMBOL(drbg_cores);

static int drbg_uninstantiate(struct drbg_state *drbg);

@@ -205,7 +206,7 @@ static int drbg_uninstantiate(struct drbg_state *drbg);
* Return: normalized strength in *bytes* value or 32 as default
* to counter programming errors
*/
-static inline unsigned short drbg_sec_strength(drbg_flag_t flags)
+unsigned short drbg_sec_strength(drbg_flag_t flags)
{
switch (flags & DRBG_STRENGTH_MASK) {
case DRBG_STRENGTH128:
@@ -218,6 +219,7 @@ static inline unsigned short drbg_sec_strength(drbg_flag_t flags)
return 32;
}
}
+EXPORT_SYMBOL(drbg_sec_strength);

/*
* FIPS 140-2 continuous self test for the noise source
@@ -1202,7 +1204,7 @@ static int drbg_seed(struct drbg_state *drbg, struct drbg_string *pers,
}

/* Free all substructures in a DRBG state without the DRBG state structure */
-static inline void drbg_dealloc_state(struct drbg_state *drbg)
+void drbg_dealloc_state(struct drbg_state *drbg)
{
if (!drbg)
return;
@@ -1223,12 +1225,13 @@ static inline void drbg_dealloc_state(struct drbg_state *drbg)
drbg->fips_primed = false;
}
}
+EXPORT_SYMBOL(drbg_dealloc_state);

/*
* Allocate all sub-structures for a DRBG state.
* The DRBG state structure must already be allocated.
*/
-static inline int drbg_alloc_state(struct drbg_state *drbg)
+int drbg_alloc_state(struct drbg_state *drbg)
{
int ret = -ENOMEM;
unsigned int sb_size = 0;
@@ -1307,6 +1310,7 @@ static inline int drbg_alloc_state(struct drbg_state *drbg)
drbg_dealloc_state(drbg);
return ret;
}
+EXPORT_SYMBOL(drbg_alloc_state);

/*************************************************************************
* DRBG interface functions
@@ -1874,8 +1878,7 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg,
*
* return: flags
*/
-static inline void drbg_convert_tfm_core(const char *cra_driver_name,
- int *coreref, bool *pr)
+void drbg_convert_tfm_core(const char *cra_driver_name, int *coreref, bool *pr)
{
int i = 0;
size_t start = 0;
@@ -1902,6 +1905,7 @@ static inline void drbg_convert_tfm_core(const char *cra_driver_name,
}
}
}
+EXPORT_SYMBOL(drbg_convert_tfm_core);

static int drbg_kcapi_init(struct crypto_tfm *tfm)
{
diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 8c9af21efce1..c63b20375235 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -282,4 +282,11 @@ enum drbg_prefixes {
DRBG_PREFIX3
};

+extern int drbg_alloc_state(struct drbg_state *drbg);
+extern void drbg_dealloc_state(struct drbg_state *drbg);
+extern void drbg_convert_tfm_core(const char *cra_driver_name, int *coreref,
+ bool *pr);
+extern const struct drbg_core drbg_cores[];
+extern unsigned short drbg_sec_strength(drbg_flag_t flags);
+
#endif /* _DRBG_H */
--
2.24.1