Instead of exposing the s390-optimized SHA-1 code via s390-specific
crypto_shash algorithms, instead just implement the sha1_blocks()
library function. This is much simpler, it makes the SHA-1 library
functions be s390-optimized, and it fixes the longstanding issue where
the s390-optimized SHA-1 code was disabled by default. SHA-1 still
remains available through crypto_shash, but individual architectures no
longer need to handle it.
Signed-off-by: Eric Biggers <ebigg...@kernel.org>
---
arch/s390/configs/debug_defconfig | 1 -
arch/s390/configs/defconfig | 1 -
arch/s390/crypto/Kconfig | 10 ---
arch/s390/crypto/Makefile | 1 -
arch/s390/crypto/sha1_s390.c | 103 ------------------------------
lib/crypto/Kconfig | 1 +
lib/crypto/s390/sha1.h | 28 ++++++++
7 files changed, 29 insertions(+), 116 deletions(-)
delete mode 100644 arch/s390/crypto/sha1_s390.c
create mode 100644 lib/crypto/s390/sha1.h
diff --git a/arch/s390/configs/debug_defconfig
b/arch/s390/configs/debug_defconfig
index ef313c30b375c..a7db7ed287205 100644
--- a/arch/s390/configs/debug_defconfig
+++ b/arch/s390/configs/debug_defconfig
@@ -802,11 +802,10 @@ CONFIG_CRYPTO_ZSTD=m
CONFIG_CRYPTO_ANSI_CPRNG=m
CONFIG_CRYPTO_USER_API_HASH=m
CONFIG_CRYPTO_USER_API_SKCIPHER=m
CONFIG_CRYPTO_USER_API_RNG=m
CONFIG_CRYPTO_USER_API_AEAD=m
-CONFIG_CRYPTO_SHA1_S390=m
CONFIG_CRYPTO_SHA3_256_S390=m
CONFIG_CRYPTO_SHA3_512_S390=m
CONFIG_CRYPTO_GHASH_S390=m
CONFIG_CRYPTO_AES_S390=m
CONFIG_CRYPTO_DES_S390=m
diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig
index b6fa341bb03b6..0217ed5616bf4 100644
--- a/arch/s390/configs/defconfig
+++ b/arch/s390/configs/defconfig
@@ -789,11 +789,10 @@ CONFIG_CRYPTO_ANSI_CPRNG=m
CONFIG_CRYPTO_JITTERENTROPY_OSR=1
CONFIG_CRYPTO_USER_API_HASH=m
CONFIG_CRYPTO_USER_API_SKCIPHER=m
CONFIG_CRYPTO_USER_API_RNG=m
CONFIG_CRYPTO_USER_API_AEAD=m
-CONFIG_CRYPTO_SHA1_S390=m
CONFIG_CRYPTO_SHA3_256_S390=m
CONFIG_CRYPTO_SHA3_512_S390=m
CONFIG_CRYPTO_GHASH_S390=m
CONFIG_CRYPTO_AES_S390=m
CONFIG_CRYPTO_DES_S390=m
diff --git a/arch/s390/crypto/Kconfig b/arch/s390/crypto/Kconfig
index 4557514fbac35..03f73fbd38b62 100644
--- a/arch/s390/crypto/Kconfig
+++ b/arch/s390/crypto/Kconfig
@@ -1,19 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
menu "Accelerated Cryptographic Algorithms for CPU (s390)"
-config CRYPTO_SHA1_S390
- tristate "Hash functions: SHA-1"
- select CRYPTO_HASH
- help
- SHA-1 secure hash algorithm (FIPS 180)
-
- Architecture: s390
-
- It is available as of z990.
-
config CRYPTO_SHA3_256_S390
tristate "Hash functions: SHA3-224 and SHA3-256"
select CRYPTO_HASH
help
SHA3-224 and SHA3-256 secure hash algorithms (FIPS 202)
diff --git a/arch/s390/crypto/Makefile b/arch/s390/crypto/Makefile
index 473d64c0982af..1e5a1038d4914 100644
--- a/arch/s390/crypto/Makefile
+++ b/arch/s390/crypto/Makefile
@@ -1,11 +1,10 @@
# SPDX-License-Identifier: GPL-2.0
#
# Cryptographic API
#
-obj-$(CONFIG_CRYPTO_SHA1_S390) += sha1_s390.o sha_common.o
obj-$(CONFIG_CRYPTO_SHA3_256_S390) += sha3_256_s390.o sha_common.o
obj-$(CONFIG_CRYPTO_SHA3_512_S390) += sha3_512_s390.o sha_common.o
obj-$(CONFIG_CRYPTO_DES_S390) += des_s390.o
obj-$(CONFIG_CRYPTO_AES_S390) += aes_s390.o
obj-$(CONFIG_CRYPTO_PAES_S390) += paes_s390.o
diff --git a/arch/s390/crypto/sha1_s390.c b/arch/s390/crypto/sha1_s390.c
deleted file mode 100644
index d229cbd2ba229..0000000000000
--- a/arch/s390/crypto/sha1_s390.c
+++ /dev/null
@@ -1,103 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Cryptographic API.
- *
- * s390 implementation of the SHA1 Secure Hash Algorithm.
- *
- * Derived from cryptoapi implementation, adapted for in-place
- * scatterlist interface. Originally based on the public domain
- * implementation written by Steve Reid.
- *
- * s390 Version:
- * Copyright IBM Corp. 2003, 2007
- * Author(s): Thomas Spatzier
- * Jan Glauber (jan.glau...@de.ibm.com)
- *
- * Derived from "crypto/sha1_generic.c"
- * Copyright (c) Alan Smithee.
- * Copyright (c) Andrew McDonald <and...@mcdonald.org.uk>
- * Copyright (c) Jean-Francois Dive <j...@linuxbe.org>
- */
-#include <asm/cpacf.h>
-#include <crypto/internal/hash.h>
-#include <crypto/sha1.h>
-#include <linux/cpufeature.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-
-#include "sha.h"
-
-static int s390_sha1_init(struct shash_desc *desc)
-{
- struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
-
- sctx->state[0] = SHA1_H0;
- sctx->state[1] = SHA1_H1;
- sctx->state[2] = SHA1_H2;
- sctx->state[3] = SHA1_H3;
- sctx->state[4] = SHA1_H4;
- sctx->count = 0;
- sctx->func = CPACF_KIMD_SHA_1;
-
- return 0;
-}
-
-static int s390_sha1_export(struct shash_desc *desc, void *out)
-{
- struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
- struct sha1_state *octx = out;
-
- octx->count = sctx->count;
- memcpy(octx->state, sctx->state, sizeof(octx->state));
- return 0;
-}
-
-static int s390_sha1_import(struct shash_desc *desc, const void *in)
-{
- struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
- const struct sha1_state *ictx = in;
-
- sctx->count = ictx->count;
- memcpy(sctx->state, ictx->state, sizeof(ictx->state));
- sctx->func = CPACF_KIMD_SHA_1;
- return 0;
-}
-
-static struct shash_alg alg = {
- .digestsize = SHA1_DIGEST_SIZE,
- .init = s390_sha1_init,
- .update = s390_sha_update_blocks,
- .finup = s390_sha_finup,
- .export = s390_sha1_export,
- .import = s390_sha1_import,
- .descsize = S390_SHA_CTX_SIZE,
- .statesize = SHA1_STATE_SIZE,
- .base = {
- .cra_name = "sha1",
- .cra_driver_name= "sha1-s390",
- .cra_priority = 300,
- .cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY |
- CRYPTO_AHASH_ALG_FINUP_MAX,
- .cra_blocksize = SHA1_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
-
-static int __init sha1_s390_init(void)
-{
- if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_1))
- return -ENODEV;
- return crypto_register_shash(&alg);
-}
-
-static void __exit sha1_s390_fini(void)
-{
- crypto_unregister_shash(&alg);
-}
-
-module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha1_s390_init);
-module_exit(sha1_s390_fini);
-
-MODULE_ALIAS_CRYPTO("sha1");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig
index e842f173cadec..2c55b75cea525 100644
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -148,10 +148,11 @@ config CRYPTO_LIB_SHA1_ARCH
depends on CRYPTO_LIB_SHA1 && !UML
default y if ARM
default y if ARM64 && KERNEL_MODE_NEON
default y if MIPS && CPU_CAVIUM_OCTEON
default y if PPC
+ default y if S390
config CRYPTO_LIB_SHA256
tristate
help
Enable the SHA-256 library interface. This interface may be fulfilled
diff --git a/lib/crypto/s390/sha1.h b/lib/crypto/s390/sha1.h
new file mode 100644
index 0000000000000..08bd138e881cc
--- /dev/null
+++ b/lib/crypto/s390/sha1.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SHA-1 optimized using the CP Assist for Cryptographic Functions (CPACF)
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/cpacf.h>
+#include <linux/cpufeature.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha1);
+
+static void sha1_blocks(struct sha1_block_state *state,
+ const u8 *data, size_t nblocks)
+{
+ if (static_branch_likely(&have_cpacf_sha1))
+ cpacf_kimd(CPACF_KIMD_SHA_1, state, data,
+ nblocks * SHA1_BLOCK_SIZE);
+ else
+ sha1_blocks_generic(state, data, nblocks);
+}
+
+#define sha1_mod_init_arch sha1_mod_init_arch
+static inline void sha1_mod_init_arch(void)
+{
+ if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
+ cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_1))
+ static_branch_enable(&have_cpacf_sha1);
+}
--
2.50.1
