+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Cryptographic API.
- *
- * s390 implementation of the SHA256 and SHA224 Secure Hash Algorithm.
- *
- * s390 Version:
- * Copyright IBM Corp. 2005, 2011
- * Author(s): Jan Glauber (jang@de.ibm.com)
- */
-#include <asm/cpacf.h>
-#include <crypto/internal/hash.h>
-#include <crypto/sha2.h>
-#include <linux/cpufeature.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/string.h>
-
-#include "sha.h"
-
-static int s390_sha256_init(struct shash_desc *desc)
-{
- struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
-
- sctx->state[0] = SHA256_H0;
- sctx->state[1] = SHA256_H1;
- sctx->state[2] = SHA256_H2;
- sctx->state[3] = SHA256_H3;
- sctx->state[4] = SHA256_H4;
- sctx->state[5] = SHA256_H5;
- sctx->state[6] = SHA256_H6;
- sctx->state[7] = SHA256_H7;
- sctx->count = 0;
- sctx->func = CPACF_KIMD_SHA_256;
-
- return 0;
-}
-
-static int sha256_export(struct shash_desc *desc, void *out)
-{
- struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
- struct crypto_sha256_state *octx = out;
-
- octx->count = sctx->count;
- memcpy(octx->state, sctx->state, sizeof(octx->state));
- return 0;
-}
-
-static int sha256_import(struct shash_desc *desc, const void *in)
-{
- struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
- const struct crypto_sha256_state *ictx = in;
-
- sctx->count = ictx->count;
- memcpy(sctx->state, ictx->state, sizeof(ictx->state));
- sctx->func = CPACF_KIMD_SHA_256;
- return 0;
-}
-
-static struct shash_alg sha256_alg = {
- .digestsize = SHA256_DIGEST_SIZE,
- .init = s390_sha256_init,
- .update = s390_sha_update_blocks,
- .finup = s390_sha_finup,
- .export = sha256_export,
- .import = sha256_import,
- .descsize = S390_SHA_CTX_SIZE,
- .statesize = sizeof(struct crypto_sha256_state),
- .base = {
- .cra_name = "sha256",
- .cra_driver_name= "sha256-s390",
- .cra_priority = 300,
- .cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY,
- .cra_blocksize = SHA256_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
-
-static int s390_sha224_init(struct shash_desc *desc)
-{
- struct s390_sha_ctx *sctx = shash_desc_ctx(desc);
-
- sctx->state[0] = SHA224_H0;
- sctx->state[1] = SHA224_H1;
- sctx->state[2] = SHA224_H2;
- sctx->state[3] = SHA224_H3;
- sctx->state[4] = SHA224_H4;
- sctx->state[5] = SHA224_H5;
- sctx->state[6] = SHA224_H6;
- sctx->state[7] = SHA224_H7;
- sctx->count = 0;
- sctx->func = CPACF_KIMD_SHA_256;
-
- return 0;
-}
-
-static struct shash_alg sha224_alg = {
- .digestsize = SHA224_DIGEST_SIZE,
- .init = s390_sha224_init,
- .update = s390_sha_update_blocks,
- .finup = s390_sha_finup,
- .export = sha256_export,
- .import = sha256_import,
- .descsize = S390_SHA_CTX_SIZE,
- .statesize = sizeof(struct crypto_sha256_state),
- .base = {
- .cra_name = "sha224",
- .cra_driver_name= "sha224-s390",
- .cra_priority = 300,
- .cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY,
- .cra_blocksize = SHA224_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
-
-static int __init sha256_s390_init(void)
-{
- int ret;
-
- if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
- return -ENODEV;
- ret = crypto_register_shash(&sha256_alg);
- if (ret < 0)
- goto out;
- ret = crypto_register_shash(&sha224_alg);
- if (ret < 0)
- crypto_unregister_shash(&sha256_alg);
-out:
- return ret;
-}
-
-static void __exit sha256_s390_fini(void)
-{
- crypto_unregister_shash(&sha224_alg);
- crypto_unregister_shash(&sha256_alg);
-}
-
-module_cpu_feature_match(S390_CPU_FEATURE_MSA, sha256_s390_init);
-module_exit(sha256_s390_fini);
-
-MODULE_ALIAS_CRYPTO("sha256");
-MODULE_ALIAS_CRYPTO("sha224");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("SHA256 and SHA224 Secure Hash Algorithm");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SHA-256 optimized using the CP Assist for Cryptographic Functions (CPACF)
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/cpacf.h>
+#include <crypto/internal/sha2.h>
+#include <linux/cpufeature.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha256);
+
+void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
+ const u8 *data, size_t nblocks)
+{
+ if (static_branch_likely(&have_cpacf_sha256))
+ cpacf_kimd(CPACF_KIMD_SHA_256, state, data,
+ nblocks * SHA256_BLOCK_SIZE);
+ else
+ sha256_blocks_generic(state, data, nblocks);
+}
+EXPORT_SYMBOL(sha256_blocks_arch);
+
+bool sha256_is_arch_optimized(void)
+{
+ return static_key_enabled(&have_cpacf_sha256);
+}
+EXPORT_SYMBOL(sha256_is_arch_optimized);
+
+static int __init sha256_s390_mod_init(void)
+{
+ if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
+ cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
+ static_branch_enable(&have_cpacf_sha256);
+ return 0;
+}
+arch_initcall(sha256_s390_mod_init);
+
+static void __exit sha256_s390_mod_exit(void)
+{
+}
+module_exit(sha256_s390_mod_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA-256 using the CP Assist for Cryptographic Functions (CPACF)");
projects / linux-block.git / commitdiff