1 files changed, 28 insertions, 0 deletions
diff --git a/lib/crypto/s390/sha256.h b/lib/crypto/s390/sha256.h
new file mode 100644
index 000000000000..70a81cbc06b2
--- /dev/null
+++ b/lib/crypto/s390/sha256.h
@@ -0,0 +1,28 @@
+/* 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 <linux/cpufeature.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha256);
+
+static void sha256_blocks(struct sha256_block_state *state,
+			  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);
+}
+
+#define sha256_mod_init_arch sha256_mod_init_arch
+static inline void sha256_mod_init_arch(void)
+{
+	if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
+	    cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
+		static_branch_enable(&have_cpacf_sha256);
+}