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/* 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>
#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;
if (num) {
ctx->data[num++] = 1;
while (num < POLY1305_BLOCK_SIZE)
ctx->data[num++] = 0;
poly1305_blocks(ctx->opaque, ctx->data, POLY1305_BLOCK_SIZE, 0,
simd_context);
}
poly1305_emit(ctx->opaque, mac, ctx->nonce, simd_context);
memzero_explicit(ctx, sizeof(*ctx));
}
EXPORT_SYMBOL(poly1305_final);
#include "../selftest/poly1305.h"
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