[v32,05/12] crypto: DRBG - externalize DRBG functions for LRNG

Commit Message

Stephan Mueller Aug. 20, 2020, 8:42 a.m. UTC

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

CC: "Eric W. Biederman" <[e-mail]>
CC: "Alexander E. Patrakov" <[e-mail]>
CC: "Ahmed S. Darwish" <[e-mail]>
CC: "Theodore Y. Ts'o" <[e-mail]>
CC: Willy Tarreau <[e-mail]>
CC: Matthew Garrett <[e-mail]>
CC: Vito Caputo <[e-mail]>
CC: Andreas Dilger <[e-mail]>
CC: Jan Kara <[e-mail]>
CC: Ray Strode <[e-mail]>
CC: William Jon McCann <[e-mail]>
CC: zhangjs <[e-mail]>
CC: Andy Lutomirski <[e-mail]>
CC: Florian Weimer <[e-mail]>
CC: Lennart Poettering <[e-mail]>
CC: Nicolai Stange <[e-mail]>
Reviewed-by: Roman Drahtmueller <[e-mail]>
Tested-by: Roman Drahtmüller <[e-mail]>
Tested-by: Marcelo Henrique Cerri <[e-mail]>
Tested-by: Neil Horman <[e-mail]>
Signed-off-by: Stephan Mueller <[e-mail]>
---
 crypto/drbg.c         | 16 ++++++++++------
 include/crypto/drbg.h |  7 +++++++
 2 files changed, 17 insertions(+), 6 deletions(-)

Patch

diff --git a/crypto/drbg.c b/crypto/drbg.c
index e99fe34cfa00..3644e954785a 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
@@ -1214,7 +1216,7 @@  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;
@@ -1235,12 +1237,13 @@  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;
@@ -1321,6 +1324,7 @@  static inline int drbg_alloc_state(struct drbg_state *drbg)
 	drbg_dealloc_state(drbg);
 	return ret;
 }
+EXPORT_SYMBOL(drbg_alloc_state);
 
 /*************************************************************************
  * DRBG interface functions
@@ -1890,8 +1894,7 @@  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;
@@ -1918,6 +1921,7 @@  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 c4165126937e..71d53e028e6d 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -278,4 +278,11 @@  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 */