crypto: sha1 - Wrap library and add HMAC support

Like I did for crypto/sha512.c, rework crypto/sha1_generic.c (renamed to
crypto/sha1.c) to simply wrap the normal library functions instead of
accessing the low-level block function directly.  Also add support for
HMAC-SHA1, again just wrapping the library functions.

Since the replacement crypto_shash algorithms are implemented using the
(potentially arch-optimized) library functions, give them driver names
ending with "-lib" rather than "-generic".  Update crypto/testmgr.c and
an odd driver to take this change in driver name into account.

Note: to see the diff from crypto/sha1_generic.c to crypto/sha1.c, view
this commit with 'git show -M10'.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250712232329.818226-6-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

6 files changed, 145 insertions, 90 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 5d4cf022c577..23bd98981ae8 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -986,7 +986,8 @@ config CRYPTO_SHA1
 	select CRYPTO_HASH
 	select CRYPTO_LIB_SHA1
 	help
-	  SHA-1 secure hash algorithm (FIPS 180, ISO/IEC 10118-3)
+	  SHA-1 secure hash algorithm (FIPS 180, ISO/IEC 10118-3), including
+	  HMAC support.
 
 config CRYPTO_SHA256
 	tristate "SHA-224 and SHA-256"
diff --git a/crypto/Makefile b/crypto/Makefile
index 816607e0e78c..9110f708e5a9 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -75,7 +75,7 @@ obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o
 obj-$(CONFIG_CRYPTO_MD4) += md4.o
 obj-$(CONFIG_CRYPTO_MD5) += md5.o
 obj-$(CONFIG_CRYPTO_RMD160) += rmd160.o
-obj-$(CONFIG_CRYPTO_SHA1) += sha1_generic.o
+obj-$(CONFIG_CRYPTO_SHA1) += sha1.o
 obj-$(CONFIG_CRYPTO_SHA256) += sha256.o
 obj-$(CONFIG_CRYPTO_SHA512) += sha512.o
 obj-$(CONFIG_CRYPTO_SHA3) += sha3_generic.o
diff --git a/crypto/sha1.c b/crypto/sha1.c
new file mode 100644
index 000000000000..00e273b0401d
--- /dev/null
+++ b/crypto/sha1.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Crypto API support for SHA-1 and HMAC-SHA1
+ *
+ * Copyright (c) Alan Smithee.
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
+ * Copyright 2025 Google LLC
+ */
+#include <crypto/internal/hash.h>
+#include <crypto/sha1.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
+	0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
+	0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
+	0xaf, 0xd8, 0x07, 0x09
+};
+EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
+
+#define SHA1_CTX(desc) ((struct sha1_ctx *)shash_desc_ctx(desc))
+
+static int crypto_sha1_init(struct shash_desc *desc)
+{
+	sha1_init(SHA1_CTX(desc));
+	return 0;
+}
+
+static int crypto_sha1_update(struct shash_desc *desc,
+			      const u8 *data, unsigned int len)
+{
+	sha1_update(SHA1_CTX(desc), data, len);
+	return 0;
+}
+
+static int crypto_sha1_final(struct shash_desc *desc, u8 *out)
+{
+	sha1_final(SHA1_CTX(desc), out);
+	return 0;
+}
+
+static int crypto_sha1_digest(struct shash_desc *desc,
+			      const u8 *data, unsigned int len, u8 *out)
+{
+	sha1(data, len, out);
+	return 0;
+}
+
+#define HMAC_SHA1_KEY(tfm) ((struct hmac_sha1_key *)crypto_shash_ctx(tfm))
+#define HMAC_SHA1_CTX(desc) ((struct hmac_sha1_ctx *)shash_desc_ctx(desc))
+
+static int crypto_hmac_sha1_setkey(struct crypto_shash *tfm,
+				   const u8 *raw_key, unsigned int keylen)
+{
+	hmac_sha1_preparekey(HMAC_SHA1_KEY(tfm), raw_key, keylen);
+	return 0;
+}
+
+static int crypto_hmac_sha1_init(struct shash_desc *desc)
+{
+	hmac_sha1_init(HMAC_SHA1_CTX(desc), HMAC_SHA1_KEY(desc->tfm));
+	return 0;
+}
+
+static int crypto_hmac_sha1_update(struct shash_desc *desc,
+				   const u8 *data, unsigned int len)
+{
+	hmac_sha1_update(HMAC_SHA1_CTX(desc), data, len);
+	return 0;
+}
+
+static int crypto_hmac_sha1_final(struct shash_desc *desc, u8 *out)
+{
+	hmac_sha1_final(HMAC_SHA1_CTX(desc), out);
+	return 0;
+}
+
+static int crypto_hmac_sha1_digest(struct shash_desc *desc,
+				   const u8 *data, unsigned int len, u8 *out)
+{
+	hmac_sha1(HMAC_SHA1_KEY(desc->tfm), data, len, out);
+	return 0;
+}
+
+static struct shash_alg algs[] = {
+	{
+		.base.cra_name		= "sha1",
+		.base.cra_driver_name	= "sha1-lib",
+		.base.cra_priority	= 300,
+		.base.cra_blocksize	= SHA1_BLOCK_SIZE,
+		.base.cra_module	= THIS_MODULE,
+		.digestsize		= SHA1_DIGEST_SIZE,
+		.init			= crypto_sha1_init,
+		.update			= crypto_sha1_update,
+		.final			= crypto_sha1_final,
+		.digest			= crypto_sha1_digest,
+		.descsize		= sizeof(struct sha1_ctx),
+	},
+	{
+		.base.cra_name		= "hmac(sha1)",
+		.base.cra_driver_name	= "hmac-sha1-lib",
+		.base.cra_priority	= 300,
+		.base.cra_blocksize	= SHA1_BLOCK_SIZE,
+		.base.cra_ctxsize	= sizeof(struct hmac_sha1_key),
+		.base.cra_module	= THIS_MODULE,
+		.digestsize		= SHA1_DIGEST_SIZE,
+		.setkey			= crypto_hmac_sha1_setkey,
+		.init			= crypto_hmac_sha1_init,
+		.update			= crypto_hmac_sha1_update,
+		.final			= crypto_hmac_sha1_final,
+		.digest			= crypto_hmac_sha1_digest,
+		.descsize		= sizeof(struct hmac_sha1_ctx),
+	},
+};
+
+static int __init crypto_sha1_mod_init(void)
+{
+	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
+}
+module_init(crypto_sha1_mod_init);
+
+static void __exit crypto_sha1_mod_exit(void)
+{
+	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
+}
+module_exit(crypto_sha1_mod_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Crypto API support for SHA-1 and HMAC-SHA1");
+
+MODULE_ALIAS_CRYPTO("sha1");
+MODULE_ALIAS_CRYPTO("sha1-lib");
+MODULE_ALIAS_CRYPTO("hmac(sha1)");
+MODULE_ALIAS_CRYPTO("hmac-sha1-lib");
diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c
deleted file mode 100644
index 024e8043bab0..000000000000
--- a/crypto/sha1_generic.c
+++ /dev/null
@@ -1,87 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Cryptographic API.
- *
- * SHA1 Secure Hash Algorithm.
- *
- * Derived from cryptoapi implementation, adapted for in-place
- * scatterlist interface.
- *
- * Copyright (c) Alan Smithee.
- * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
- * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
- */
-#include <crypto/internal/hash.h>
-#include <crypto/sha1.h>
-#include <crypto/sha1_base.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/string.h>
-
-const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
-	0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
-	0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
-	0xaf, 0xd8, 0x07, 0x09
-};
-EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
-
-static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
-				  int blocks)
-{
-	u32 temp[SHA1_WORKSPACE_WORDS];
-
-	while (blocks--) {
-		sha1_transform(sst->state, src, temp);
-		src += SHA1_BLOCK_SIZE;
-	}
-	memzero_explicit(temp, sizeof(temp));
-}
-
-static int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
-			      unsigned int len)
-{
-	return sha1_base_do_update_blocks(desc, data, len,
-					  sha1_generic_block_fn);
-}
-
-static int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
-			     unsigned int len, u8 *out)
-{
-	sha1_base_do_finup(desc, data, len, sha1_generic_block_fn);
-	return sha1_base_finish(desc, out);
-}
-
-static struct shash_alg alg = {
-	.digestsize	=	SHA1_DIGEST_SIZE,
-	.init		=	sha1_base_init,
-	.update		=	crypto_sha1_update,
-	.finup		=	crypto_sha1_finup,
-	.descsize	=	SHA1_STATE_SIZE,
-	.base		=	{
-		.cra_name	=	"sha1",
-		.cra_driver_name=	"sha1-generic",
-		.cra_priority	=	100,
-		.cra_flags	=	CRYPTO_AHASH_ALG_BLOCK_ONLY,
-		.cra_blocksize	=	SHA1_BLOCK_SIZE,
-		.cra_module	=	THIS_MODULE,
-	}
-};
-
-static int __init sha1_generic_mod_init(void)
-{
-	return crypto_register_shash(&alg);
-}
-
-static void __exit sha1_generic_mod_fini(void)
-{
-	crypto_unregister_shash(&alg);
-}
-
-module_init(sha1_generic_mod_init);
-module_exit(sha1_generic_mod_fini);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
-
-MODULE_ALIAS_CRYPTO("sha1");
-MODULE_ALIAS_CRYPTO("sha1-generic");
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 4e95567f7ed1..be78e3930769 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -4237,6 +4237,7 @@ static const struct alg_test_desc alg_test_descs[] = {
 		}
 	}, {
 		.alg = "authenc(hmac(sha1),cbc(aes))",
+		.generic_driver = "authenc(hmac-sha1-lib,cbc(aes-generic))",
 		.test = alg_test_aead,
 		.fips_allowed = 1,
 		.suite = {
@@ -4244,12 +4245,14 @@ static const struct alg_test_desc alg_test_descs[] = {
 		}
 	}, {
 		.alg = "authenc(hmac(sha1),cbc(des))",
+		.generic_driver = "authenc(hmac-sha1-lib,cbc(des-generic))",
 		.test = alg_test_aead,
 		.suite = {
 			.aead = __VECS(hmac_sha1_des_cbc_tv_temp)
 		}
 	}, {
 		.alg = "authenc(hmac(sha1),cbc(des3_ede))",
+		.generic_driver = "authenc(hmac-sha1-lib,cbc(des3_ede-generic))",
 		.test = alg_test_aead,
 		.suite = {
 			.aead = __VECS(hmac_sha1_des3_ede_cbc_tv_temp)
@@ -4260,6 +4263,7 @@ static const struct alg_test_desc alg_test_descs[] = {
 		.fips_allowed = 1,
 	}, {
 		.alg = "authenc(hmac(sha1),ecb(cipher_null))",
+		.generic_driver = "authenc(hmac-sha1-lib,ecb-cipher_null)",
 		.test = alg_test_aead,
 		.suite = {
 			.aead = __VECS(hmac_sha1_ecb_cipher_null_tv_temp)
@@ -5122,6 +5126,7 @@ static const struct alg_test_desc alg_test_descs[] = {
 		}
 	}, {
 		.alg = "hmac(sha1)",
+		.generic_driver = "hmac-sha1-lib",
 		.test = alg_test_hash,
 		.fips_allowed = 1,
 		.suite = {
@@ -5462,6 +5467,7 @@ static const struct alg_test_desc alg_test_descs[] = {
 		}
 	}, {
 		.alg = "sha1",
+		.generic_driver = "sha1-lib",
 		.test = alg_test_hash,
 		.fips_allowed = 1,
 		.suite = {
diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index f312eb075fec..a8f735390f0d 100644
--- a/drivers/crypto/img-hash.c
+++ b/drivers/crypto/img-hash.c
@@ -705,7 +705,7 @@ static int img_hash_cra_md5_init(struct crypto_tfm *tfm)
 
 static int img_hash_cra_sha1_init(struct crypto_tfm *tfm)
 {
-	return img_hash_cra_init(tfm, "sha1-generic");
+	return img_hash_cra_init(tfm, "sha1-lib");
 }
 
 static int img_hash_cra_sha224_init(struct crypto_tfm *tfm)