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    SubjectRe: [PATCH net-next v5 07/20] zinc: Poly1305 generic C implementations and selftest
    On Tue, Sep 18, 2018 at 06:16:33PM +0200, Jason A. Donenfeld wrote:
    > 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;

    0 <= ctx->num < POLY1305_BLOCK_SIZE, so no need to mod by POLY1305_BLOCK_SIZE.

    > +
    > + 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;

    Same here.

    > +++ 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" */

    Hardcoding the 'input' array to 600 bytes forces the full amount of space to be
    reserved in the kernel image for every test vector. Also, if anyone adds a
    longer test vector they will need to remember to increase the value.

    It should be a const pointer instead, like the test vectors in crypto/testmgr.h.

    - Eric

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