linux-kernel - [PATCH 4/4] crypto: drbg

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Date:   Sun, 29 Oct 2023 22:48:23 +0200
From:   Dimitri John Ledkov <dimitri.ledkov@...onical.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc:     simo@...hat.com, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 4/4] crypto: drbg - Remove SHA1 from drbg

SP800-90C 3rd draft states that SHA-1 will be removed from all
specifications, including drbg by end of 2030. Given kernels built
today will be operating past that date, start complying with upcoming
requirements.

No functional change, as SHA-256 / SHA-512 based DRBG have always been
the preferred ones.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@...onical.com>
---
 crypto/drbg.c    | 16 ----------------
 crypto/testmgr.c | 25 ++++---------------------
 2 files changed, 4 insertions(+), 37 deletions(-)

diff --git a/crypto/drbg.c b/crypto/drbg.c
index 99666193d9..bccadaedcf 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -139,12 +139,6 @@ static const struct drbg_core drbg_cores[] = {
 #endif /* CONFIG_CRYPTO_DRBG_CTR */
 #ifdef CONFIG_CRYPTO_DRBG_HASH
 	{
-		.flags = DRBG_HASH | DRBG_STRENGTH128,
-		.statelen = 55, /* 440 bits */
-		.blocklen_bytes = 20,
-		.cra_name = "sha1",
-		.backend_cra_name = "sha1",
-	}, {
 		.flags = DRBG_HASH | DRBG_STRENGTH256,
 		.statelen = 111, /* 888 bits */
 		.blocklen_bytes = 48,
@@ -166,12 +160,6 @@ static const struct drbg_core drbg_cores[] = {
 #endif /* CONFIG_CRYPTO_DRBG_HASH */
 #ifdef CONFIG_CRYPTO_DRBG_HMAC
 	{
-		.flags = DRBG_HMAC | DRBG_STRENGTH128,
-		.statelen = 20, /* block length of cipher */
-		.blocklen_bytes = 20,
-		.cra_name = "hmac_sha1",
-		.backend_cra_name = "hmac(sha1)",
-	}, {
 		.flags = DRBG_HMAC | DRBG_STRENGTH256,
 		.statelen = 48, /* block length of cipher */
 		.blocklen_bytes = 48,
@@ -648,8 +636,6 @@ MODULE_ALIAS_CRYPTO("drbg_pr_hmac_sha384");
 MODULE_ALIAS_CRYPTO("drbg_nopr_hmac_sha384");
 MODULE_ALIAS_CRYPTO("drbg_pr_hmac_sha256");
 MODULE_ALIAS_CRYPTO("drbg_nopr_hmac_sha256");
-MODULE_ALIAS_CRYPTO("drbg_pr_hmac_sha1");
-MODULE_ALIAS_CRYPTO("drbg_nopr_hmac_sha1");
 
 /* update function of HMAC DRBG as defined in 10.1.2.2 */
 static int drbg_hmac_update(struct drbg_state *drbg, struct list_head *seed,
@@ -768,8 +754,6 @@ MODULE_ALIAS_CRYPTO("drbg_pr_sha384");
 MODULE_ALIAS_CRYPTO("drbg_nopr_sha384");
 MODULE_ALIAS_CRYPTO("drbg_pr_sha256");
 MODULE_ALIAS_CRYPTO("drbg_nopr_sha256");
-MODULE_ALIAS_CRYPTO("drbg_pr_sha1");
-MODULE_ALIAS_CRYPTO("drbg_nopr_sha1");
 
 /*
  * Increment buffer
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 216878c8bc..209b21ef79 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -4849,14 +4849,6 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.suite = {
 			.drbg = __VECS(drbg_nopr_ctr_aes256_tv_template)
 		}
-	}, {
-		/*
-		 * There is no need to specifically test the DRBG with every
-		 * backend cipher -- covered by drbg_nopr_hmac_sha256 test
-		 */
-		.alg = "drbg_nopr_hmac_sha1",
-		.fips_allowed = 1,
-		.test = alg_test_null,
 	}, {
 		.alg = "drbg_nopr_hmac_sha256",
 		.test = alg_test_drbg,
@@ -4865,7 +4857,10 @@ static const struct alg_test_desc alg_test_descs[] = {
 			.drbg = __VECS(drbg_nopr_hmac_sha256_tv_template)
 		}
 	}, {
-		/* covered by drbg_nopr_hmac_sha256 test */
+		/*
+		 * There is no need to specifically test the DRBG with every
+		 * backend cipher -- covered by drbg_nopr_hmac_sha512 test
+		 */
 		.alg = "drbg_nopr_hmac_sha384",
 		.test = alg_test_null,
 	}, {
@@ -4875,10 +4870,6 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.suite = {
 			.drbg = __VECS(drbg_nopr_hmac_sha512_tv_template)
 		}
-	}, {
-		.alg = "drbg_nopr_sha1",
-		.fips_allowed = 1,
-		.test = alg_test_null,
 	}, {
 		.alg = "drbg_nopr_sha256",
 		.test = alg_test_drbg,
@@ -4910,10 +4901,6 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.alg = "drbg_pr_ctr_aes256",
 		.fips_allowed = 1,
 		.test = alg_test_null,
-	}, {
-		.alg = "drbg_pr_hmac_sha1",
-		.fips_allowed = 1,
-		.test = alg_test_null,
 	}, {
 		.alg = "drbg_pr_hmac_sha256",
 		.test = alg_test_drbg,
@@ -4929,10 +4916,6 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.alg = "drbg_pr_hmac_sha512",
 		.test = alg_test_null,
 		.fips_allowed = 1,
-	}, {
-		.alg = "drbg_pr_sha1",
-		.fips_allowed = 1,
-		.test = alg_test_null,
 	}, {
 		.alg = "drbg_pr_sha256",
 		.test = alg_test_drbg,
-- 
2.34.1