1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arm/lib/crypto/poly1305-glue.c b/arch/arm/lib/crypto/poly1305-glue.c
new file mode 100644
index 000000000000..2603b0771f2c
--- /dev/null
+++ b/arch/arm/lib/crypto/poly1305-glue.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * OpenSSL/Cryptogams accelerated Poly1305 transform for ARM
+ *
+ * Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ */
+
+#include <asm/hwcap.h>
+#include <asm/neon.h>
+#include <crypto/internal/poly1305.h>
+#include <linux/cpufeature.h>
+#include <linux/jump_label.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/unaligned.h>
+
+asmlinkage void poly1305_block_init_arch(
+	struct poly1305_block_state *state,
+	const u8 raw_key[POLY1305_BLOCK_SIZE]);
+EXPORT_SYMBOL_GPL(poly1305_block_init_arch);
+asmlinkage void poly1305_blocks_arm(struct poly1305_block_state *state,
+				    const u8 *src, u32 len, u32 hibit);
+asmlinkage void poly1305_blocks_neon(struct poly1305_block_state *state,
+				     const u8 *src, u32 len, u32 hibit);
+asmlinkage void poly1305_emit_arch(const struct poly1305_state *state,
+				   u8 digest[POLY1305_DIGEST_SIZE],
+				   const u32 nonce[4]);
+EXPORT_SYMBOL_GPL(poly1305_emit_arch);
+
+void __weak poly1305_blocks_neon(struct poly1305_block_state *state,
+				 const u8 *src, u32 len, u32 hibit)
+{
+}
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
+
+void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *src,
+			  unsigned int len, u32 padbit)
+{
+	len = round_down(len, POLY1305_BLOCK_SIZE);
+	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
+	    static_branch_likely(&have_neon)) {
+		do {
+			unsigned int todo = min_t(unsigned int, len, SZ_4K);
+
+			kernel_neon_begin();
+			poly1305_blocks_neon(state, src, todo, padbit);
+			kernel_neon_end();
+
+			len -= todo;
+			src += todo;
+		} while (len);
+	} else
+		poly1305_blocks_arm(state, src, len, padbit);
+}
+EXPORT_SYMBOL_GPL(poly1305_blocks_arch);
+
+bool poly1305_is_arch_optimized(void)
+{
+	/* We always can use at least the ARM scalar implementation. */
+	return true;
+}
+EXPORT_SYMBOL(poly1305_is_arch_optimized);
+
+static int __init arm_poly1305_mod_init(void)
+{
+	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
+	    (elf_hwcap & HWCAP_NEON))
+		static_branch_enable(&have_neon);
+	return 0;
+}
+subsys_initcall(arm_poly1305_mod_init);
+
+static void __exit arm_poly1305_mod_exit(void)
+{
+}
+module_exit(arm_poly1305_mod_exit);
+
+MODULE_DESCRIPTION("Accelerated Poly1305 transform for ARM");
+MODULE_LICENSE("GPL v2");