[PATCH v2 13/25] crypto: Add appropriate consts to RNG API

[George Spelvin <linux@horizon.com>]

Signed-off-by: George Spelvin <linux@horizon.com>
---
 crypto/ansi_cprng.c    | 11 ++++++-----
 crypto/krng.c          |  2 +-
 crypto/rng.c           |  3 ++-
 include/crypto/rng.h   |  2 +-
 include/linux/crypto.h |  6 ++++--
 5 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/crypto/ansi_cprng.c b/crypto/ansi_cprng.c
index 249b944f..c1c81266 100644
--- a/crypto/ansi_cprng.c
+++ b/crypto/ansi_cprng.c
@@ -299,11 +299,11 @@ static int cprng_get_random(struct crypto_rng *tfm, u8 *rdata,
  *  V and KEY are required during reset, and DT is optional, detected
  *  as being present by testing the length of the seed
  */
-static int cprng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+static int cprng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
 {
 	struct prng_context *prng = crypto_rng_ctx(tfm);
-	u8 *key = seed + DEFAULT_BLK_SZ;
-	u8 *dt = NULL;
+	const u8 *key = seed + DEFAULT_BLK_SZ;
+	const u8 *dt = NULL;
 
 	if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
 		return -EINVAL;
@@ -327,9 +327,10 @@ static int fips_cprng_get_random(struct crypto_rng *tfm, u8 *rdata,
 	return get_prng_bytes(rdata, dlen, prng, true);
 }
 
-static int fips_cprng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+static int fips_cprng_reset(struct crypto_rng *tfm, const u8 *seed,
+			    unsigned int slen)
 {
-	u8 *key = seed + DEFAULT_BLK_SZ;
+	const u8 *key = seed + DEFAULT_BLK_SZ;
 	int rc;
 
 	struct prng_context *prng = crypto_rng_ctx(tfm);
diff --git a/crypto/krng.c b/crypto/krng.c
index a2d2b72f..007ea7e3 100644
--- a/crypto/krng.c
+++ b/crypto/krng.c
@@ -22,7 +22,7 @@ static int krng_get_random(struct crypto_rng *tfm, u8 *rdata, unsigned int dlen)
 	return 0;
 }
 
-static int krng_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+static int krng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
 {
 	return 0;
 }
diff --git a/crypto/rng.c b/crypto/rng.c
index e0a25c24..9e3a6efd 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -29,7 +29,8 @@ struct crypto_rng *crypto_default_rng;
 EXPORT_SYMBOL_GPL(crypto_default_rng);
 static int crypto_default_rng_refcnt;
 
-static int rngapi_reset(struct crypto_rng *tfm, u8 *seed, unsigned int slen)
+static int rngapi_reset(struct crypto_rng *tfm, const u8 *seed,
+			unsigned int slen)
 {
 	u8 *buf = NULL;
 	int err;
diff --git a/include/crypto/rng.h b/include/crypto/rng.h
index c93f9b91..9659300a 100644
--- a/include/crypto/rng.h
+++ b/include/crypto/rng.h
@@ -62,7 +62,7 @@ static inline int crypto_rng_get_bytes(struct crypto_rng *tfm,
 }
 
 static inline int crypto_rng_reset(struct crypto_rng *tfm,
-				   u8 *seed, unsigned int slen)
+				   const u8 *seed, unsigned int slen)
 {
 	return crypto_rng_crt(tfm)->rng_reset(tfm, seed, slen);
 }
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index d45e9496..8aa6350b 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -264,7 +264,8 @@ struct compress_alg {
 struct rng_alg {
 	int (*rng_make_random)(struct crypto_rng *tfm, u8 *rdata,
 			       unsigned int dlen);
-	int (*rng_reset)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
+	int (*rng_reset)(struct crypto_rng *tfm, const u8 *seed,
+			       unsigned int slen);
 
 	unsigned int seedsize;
 };
@@ -399,7 +400,8 @@ struct compress_tfm {
 struct rng_tfm {
 	int (*rng_gen_random)(struct crypto_rng *tfm, u8 *rdata,
 			      unsigned int dlen);
-	int (*rng_reset)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
+	int (*rng_reset)(struct crypto_rng *tfm, const u8 *seed,
+			 unsigned int slen);
 };
 
 #define crt_ablkcipher	crt_u.ablkcipher
-- 
2.1.3