1 files changed, 57 insertions, 0 deletions
diff --git a/lib/crypto/arm64/sha256.h b/lib/crypto/arm64/sha256.h
new file mode 100644
index 000000000000..a211966c124a
--- /dev/null
+++ b/lib/crypto/arm64/sha256.h
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SHA-256 optimized for ARM64
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/neon.h>
+#include <crypto/internal/simd.h>
+#include <linux/cpufeature.h>
+
+asmlinkage void sha256_block_data_order(struct sha256_block_state *state,
+					const u8 *data, size_t nblocks);
+asmlinkage void sha256_block_neon(struct sha256_block_state *state,
+				  const u8 *data, size_t nblocks);
+asmlinkage size_t __sha256_ce_transform(struct sha256_block_state *state,
+					const u8 *data, size_t nblocks);
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
+
+static void sha256_blocks(struct sha256_block_state *state,
+			  const u8 *data, size_t nblocks)
+{
+	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
+	    static_branch_likely(&have_neon) && crypto_simd_usable()) {
+		if (static_branch_likely(&have_ce)) {
+			do {
+				size_t rem;
+
+				kernel_neon_begin();
+				rem = __sha256_ce_transform(state,
+							    data, nblocks);
+				kernel_neon_end();
+				data += (nblocks - rem) * SHA256_BLOCK_SIZE;
+				nblocks = rem;
+			} while (nblocks);
+		} else {
+			kernel_neon_begin();
+			sha256_block_neon(state, data, nblocks);
+			kernel_neon_end();
+		}
+	} else {
+		sha256_block_data_order(state, data, nblocks);
+	}
+}
+
+#ifdef CONFIG_KERNEL_MODE_NEON
+#define sha256_mod_init_arch sha256_mod_init_arch
+static inline void sha256_mod_init_arch(void)
+{
+	if (cpu_have_named_feature(ASIMD)) {
+		static_branch_enable(&have_neon);
+		if (cpu_have_named_feature(SHA2))
+			static_branch_enable(&have_ce);
+	}
+}
+#endif /* CONFIG_KERNEL_MODE_NEON */