1 files changed, 39 insertions, 0 deletions
diff --git a/lib/crypto/arm64/sha1.h b/lib/crypto/arm64/sha1.h
new file mode 100644
index 000000000000..f822563538cc
--- /dev/null
+++ b/lib/crypto/arm64/sha1.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SHA-1 optimized for ARM64
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/neon.h>
+#include <asm/simd.h>
+#include <linux/cpufeature.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
+
+asmlinkage size_t __sha1_ce_transform(struct sha1_block_state *state,
+				      const u8 *data, size_t nblocks);
+
+static void sha1_blocks(struct sha1_block_state *state,
+			const u8 *data, size_t nblocks)
+{
+	if (static_branch_likely(&have_ce) && likely(may_use_simd())) {
+		do {
+			size_t rem;
+
+			kernel_neon_begin();
+			rem = __sha1_ce_transform(state, data, nblocks);
+			kernel_neon_end();
+			data += (nblocks - rem) * SHA1_BLOCK_SIZE;
+			nblocks = rem;
+		} while (nblocks);
+	} 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_named_feature(SHA1))
+		static_branch_enable(&have_ce);
+}