[PATCH] crypto: drbg - Rename MAX_ADDTL => MAX_ADDTL_BYTES

[Eric Biggers <ebiggers@kernel.org>]

Give this constant a name which is clearer and consistent with
DRBG_MAX_REQUEST_BYTES.  No functional change.

Suggested-by: Joachim Vandersmissen <joachim@jvdsn.com>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
---
 crypto/drbg.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/crypto/drbg.c b/crypto/drbg.c
index ad7b9577479e..ab443be199a0 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -120,11 +120,11 @@
  * Maximum length of additional info and personalization strings, in bytes.
  * SP800-90A allows up to 2**35 bits, i.e. 2**32 bytes.  We use 2**32 - 2 bytes
  * so that the value never quite completely fills the range of a size_t,
  * allowing the health check to verify that larger values are rejected.
  */
-#define DRBG_MAX_ADDTL		(U32_MAX - 1)
+#define DRBG_MAX_ADDTL_BYTES	(U32_MAX - 1)
 
 struct drbg_state {
 	struct mutex drbg_mutex;	/* lock around DRBG */
 	u8 V[DRBG_STATE_LEN];		/* internal state -- 10.1.2.1 1a */
 	struct hmac_sha512_key key;	/* current key -- 10.1.2.1 1b */
@@ -235,11 +235,11 @@ static int drbg_seed(struct drbg_state *drbg, const u8 *pers, size_t pers_len,
 	u8 entropy_buf[(32 + 16) * 2];
 	size_t entropylen;
 	const u8 *entropy;
 
 	/* 9.1 / 9.2 / 9.3.1 step 3 */
-	if (pers_len > DRBG_MAX_ADDTL) {
+	if (pers_len > DRBG_MAX_ADDTL_BYTES) {
 		pr_devel("DRBG: personalization string too long %zu\n",
 			 pers_len);
 		return -EINVAL;
 	}
 
@@ -353,11 +353,11 @@ static int drbg_generate(struct drbg_state *drbg, u8 *out, size_t outlen,
 	}
 
 	/* 9.3.1 step 3 is implicit with the chosen DRBG */
 
 	/* 9.3.1 step 4 */
-	if (addtl_len > DRBG_MAX_ADDTL) {
+	if (addtl_len > DRBG_MAX_ADDTL_BYTES) {
 		pr_devel("DRBG: additional information string too long %zu\n",
 			 addtl_len);
 		return -EINVAL;
 	}
 	/* 9.3.1 step 5 is implicit with the chosen DRBG */
@@ -568,18 +568,19 @@ static inline int __init drbg_healthcheck_sanity(void)
 	 * we may get an OOPS. And we want to get an OOPS as this is a
 	 * grave bug.
 	 */
 
 	/* overflow addtllen with additional info string */
-	ret = drbg_generate(drbg, buf, OUTBUFLEN, buf, DRBG_MAX_ADDTL + 1);
+	ret = drbg_generate(drbg, buf, OUTBUFLEN, buf,
+			    DRBG_MAX_ADDTL_BYTES + 1);
 	BUG_ON(ret == 0);
 	/* overflow max_bits */
 	ret = drbg_generate(drbg, buf, DRBG_MAX_REQUEST_BYTES + 1, NULL, 0);
 	BUG_ON(ret == 0);
 
 	/* overflow max addtllen with personalization string */
-	ret = drbg_seed(drbg, buf, DRBG_MAX_ADDTL + 1, false);
+	ret = drbg_seed(drbg, buf, DRBG_MAX_ADDTL_BYTES + 1, false);
 	BUG_ON(ret == 0);
 	/* all tests passed */
 
 	pr_devel("DRBG: Sanity tests for failure code paths successfully "
 		 "completed\n");

base-commit: 5b03b1f97542c49a498dbb3b4c1fefb3aca60032
-- 
2.54.0