Re: [PATCH net-next v5 07/20] zinc: Poly1305 generic C implementations and selftest

diff --git a/lib/zinc/poly1305/poly1305.c b/lib/zinc/poly1305/poly1305.c
new file mode 100644
index 000000000000..dbab82f33aa7
--- /dev/null
+++ b/lib/zinc/poly1305/poly1305.c

@@ -0,0 +1,155 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ *
+ * Implementation of the Poly1305 message authenticator.
+ *
+ * Information: https://cr.yp.to/mac.html
+ */
+
+#include <zinc/poly1305.h>
+
+#include <asm/unaligned.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#ifndef HAVE_POLY1305_ARCH_IMPLEMENTATION
+static inline bool poly1305_init_arch(void *ctx,
+				      const u8 key[POLY1305_KEY_SIZE])
+{
+	return false;
+}
+static inline bool poly1305_blocks_arch(void *ctx, const u8 *input,
+					const size_t len, const u32 padbit,
+					simd_context_t *simd_context)
+{
+	return false;
+}
+static inline bool poly1305_emit_arch(void *ctx, u8 mac[POLY1305_MAC_SIZE],
+				      const u32 nonce[4],
+				      simd_context_t *simd_context)
+{
+	return false;
+}
+void __init poly1305_fpu_init(void)
+{
+}
+#endif
+
+#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
+#include "poly1305-donna64.h"
+#else
+#include "poly1305-donna32.h"
+#endif
+
+void poly1305_init(struct poly1305_ctx *ctx, const u8 key[POLY1305_KEY_SIZE])
+{
+	ctx->nonce[0] = get_unaligned_le32(&key[16]);
+	ctx->nonce[1] = get_unaligned_le32(&key[20]);
+	ctx->nonce[2] = get_unaligned_le32(&key[24]);
+	ctx->nonce[3] = get_unaligned_le32(&key[28]);
+
+	if (!poly1305_init_arch(ctx->opaque, key))
+		poly1305_init_generic(ctx->opaque, key);
+
+	ctx->num = 0;
+}
+EXPORT_SYMBOL(poly1305_init);
+
+static inline void poly1305_blocks(void *ctx, const u8 *input, const size_t len,
+				   const u32 padbit,
+				   simd_context_t *simd_context)
+{
+	if (!poly1305_blocks_arch(ctx, input, len, padbit, simd_context))
+		poly1305_blocks_generic(ctx, input, len, padbit);
+}
+
+static inline void poly1305_emit(void *ctx, u8 mac[POLY1305_KEY_SIZE],
+				 const u32 nonce[4],
+				 simd_context_t *simd_context)
+{
+	if (!poly1305_emit_arch(ctx, mac, nonce, simd_context))
+		poly1305_emit_generic(ctx, mac, nonce);
+}
+
+void poly1305_update(struct poly1305_ctx *ctx, const u8 *input, size_t len,
+		     simd_context_t *simd_context)
+{
+	const size_t num = ctx->num % POLY1305_BLOCK_SIZE;
+	size_t rem;

+
+	if (num) {
+		rem = POLY1305_BLOCK_SIZE - num;
+		if (len < rem) {
+			memcpy(ctx->data + num, input, len);
+			ctx->num = num + len;
+			return;
+		}
+		memcpy(ctx->data + num, input, rem);
+		poly1305_blocks(ctx->opaque, ctx->data, POLY1305_BLOCK_SIZE, 1,
+				simd_context);
+		input += rem;
+		len -= rem;
+	}
+
+	rem = len % POLY1305_BLOCK_SIZE;
+	len -= rem;
+
+	if (len >= POLY1305_BLOCK_SIZE) {
+		poly1305_blocks(ctx->opaque, input, len, 1, simd_context);
+		input += len;
+	}
+
+	if (rem)
+		memcpy(ctx->data, input, rem);
+
+	ctx->num = rem;
+}
+EXPORT_SYMBOL(poly1305_update);
+
+void poly1305_final(struct poly1305_ctx *ctx, u8 mac[POLY1305_MAC_SIZE],
+		    simd_context_t *simd_context)
+{
+	size_t num = ctx->num % POLY1305_BLOCK_SIZE;

+++ b/lib/zinc/selftest/poly1305.h

@@ -0,0 +1,875 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#ifdef DEBUG
+struct poly1305_testvec {
+	u8 input[600];
+	u8 output[POLY1305_MAC_SIZE];
+	u8 key[POLY1305_KEY_SIZE];
+	size_t ilen;
+};
+
+static const struct poly1305_testvec poly1305_testvecs[] __initconst = {
+{ /* RFC7539 */
+	.input	= { 0x43, 0x72, 0x79, 0x70, 0x74, 0x6f, 0x67, 0x72,
+		    0x61, 0x70, 0x68, 0x69, 0x63, 0x20, 0x46, 0x6f,
+		    0x72, 0x75, 0x6d, 0x20, 0x52, 0x65, 0x73, 0x65,
+		    0x61, 0x72, 0x63, 0x68, 0x20, 0x47, 0x72, 0x6f,
+		    0x75, 0x70 },
+	.ilen	= 34,
+	.output	= { 0xa8, 0x06, 0x1d, 0xc1, 0x30, 0x51, 0x36, 0xc6,
+		    0xc2, 0x2b, 0x8b, 0xaf, 0x0c, 0x01, 0x27, 0xa9 },
+	.key	= { 0x85, 0xd6, 0xbe, 0x78, 0x57, 0x55, 0x6d, 0x33,
+		    0x7f, 0x44, 0x52, 0xfe, 0x42, 0xd5, 0x06, 0xa8,
+		    0x01, 0x03, 0x80, 0x8a, 0xfb, 0x0d, 0xb2, 0xfd,
+		    0x4a, 0xbf, 0xf6, 0xaf, 0x41, 0x49, 0xf5, 0x1b },
+}, { /* "The Poly1305-AES message-authentication code" */