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From:   Stephan =?ISO-8859-1?Q?M=FCller?= <smueller@chronox.de>
To:     linux-crypto@vger.kernel.org
Cc:     herbert@gondor.apana.org.au
Subject: [PATCH] crypto: DRBG - switch to HMAC SHA512 DRBG as default DRBG
Date:   Thu, 20 May 2021 21:31:11 +0200
Message-ID: <3171520.o5pSzXOnS6@positron.chronox.de>
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Precedence: bulk

The default DRBG is the one that has the highest priority. The priority
is defined based on the order of the list drbg_cores[] where the highest
priority is given to the last entry by drbg_fill_array.

With this patch the default DRBG is switched from HMAC SHA256 to HMAC
SHA512 to support compliance with SP800-90B and SP800-90C (current
draft).

The user of the crypto API is completely unaffected by the change.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
---
 crypto/drbg.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/crypto/drbg.c b/crypto/drbg.c
index 1b4587e0ddad..ea85d4a0fe9e 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -176,18 +176,18 @@ static const struct drbg_core drbg_cores[] = {
 		.blocklen_bytes = 48,
 		.cra_name = "hmac_sha384",
 		.backend_cra_name = "hmac(sha384)",
-	}, {
-		.flags = DRBG_HMAC | DRBG_STRENGTH256,
-		.statelen = 64, /* block length of cipher */
-		.blocklen_bytes = 64,
-		.cra_name = "hmac_sha512",
-		.backend_cra_name = "hmac(sha512)",
 	}, {
 		.flags = DRBG_HMAC | DRBG_STRENGTH256,
 		.statelen = 32, /* block length of cipher */
 		.blocklen_bytes = 32,
 		.cra_name = "hmac_sha256",
 		.backend_cra_name = "hmac(sha256)",
+	}, {
+		.flags = DRBG_HMAC | DRBG_STRENGTH256,
+		.statelen = 64, /* block length of cipher */
+		.blocklen_bytes = 64,
+		.cra_name = "hmac_sha512",
+		.backend_cra_name = "hmac(sha512)",
 	},
 #endif /* CONFIG_CRYPTO_DRBG_HMAC */
 };
-- 
2.31.1