mirror of
https://github.com/torvalds/linux.git
synced 2024-11-21 19:41:42 +00:00
crypto: poly1305 - move core routines into a separate library
Move the core Poly1305 routines shared between the generic Poly1305 shash driver and the Adiantum and NHPoly1305 drivers into a separate library so that using just this pieces does not pull in the crypto API pieces of the generic Poly1305 routine. In a subsequent patch, we will augment this generic library with init/update/final routines so that Poyl1305 algorithm can be used directly without the need for using the crypto API's shash abstraction. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
22cf705360
commit
48ea8c6ebc
@ -7,8 +7,8 @@
|
||||
|
||||
#include <crypto/algapi.h>
|
||||
#include <crypto/internal/hash.h>
|
||||
#include <crypto/internal/poly1305.h>
|
||||
#include <crypto/internal/simd.h>
|
||||
#include <crypto/poly1305.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
|
||||
@ -446,7 +446,7 @@ config CRYPTO_KEYWRAP
|
||||
config CRYPTO_NHPOLY1305
|
||||
tristate
|
||||
select CRYPTO_HASH
|
||||
select CRYPTO_POLY1305
|
||||
select CRYPTO_LIB_POLY1305_GENERIC
|
||||
|
||||
config CRYPTO_NHPOLY1305_SSE2
|
||||
tristate "NHPoly1305 hash function (x86_64 SSE2 implementation)"
|
||||
@ -467,7 +467,7 @@ config CRYPTO_NHPOLY1305_AVX2
|
||||
config CRYPTO_ADIANTUM
|
||||
tristate "Adiantum support"
|
||||
select CRYPTO_CHACHA20
|
||||
select CRYPTO_POLY1305
|
||||
select CRYPTO_LIB_POLY1305_GENERIC
|
||||
select CRYPTO_NHPOLY1305
|
||||
select CRYPTO_MANAGER
|
||||
help
|
||||
@ -703,6 +703,7 @@ config CRYPTO_GHASH
|
||||
config CRYPTO_POLY1305
|
||||
tristate "Poly1305 authenticator algorithm"
|
||||
select CRYPTO_HASH
|
||||
select CRYPTO_LIB_POLY1305_GENERIC
|
||||
help
|
||||
Poly1305 authenticator algorithm, RFC7539.
|
||||
|
||||
|
||||
@ -33,6 +33,7 @@
|
||||
#include <crypto/b128ops.h>
|
||||
#include <crypto/chacha.h>
|
||||
#include <crypto/internal/hash.h>
|
||||
#include <crypto/internal/poly1305.h>
|
||||
#include <crypto/internal/skcipher.h>
|
||||
#include <crypto/nhpoly1305.h>
|
||||
#include <crypto/scatterwalk.h>
|
||||
@ -242,11 +243,11 @@ static void adiantum_hash_header(struct skcipher_request *req)
|
||||
|
||||
BUILD_BUG_ON(sizeof(header) % POLY1305_BLOCK_SIZE != 0);
|
||||
poly1305_core_blocks(&state, &tctx->header_hash_key,
|
||||
&header, sizeof(header) / POLY1305_BLOCK_SIZE);
|
||||
&header, sizeof(header) / POLY1305_BLOCK_SIZE, 1);
|
||||
|
||||
BUILD_BUG_ON(TWEAK_SIZE % POLY1305_BLOCK_SIZE != 0);
|
||||
poly1305_core_blocks(&state, &tctx->header_hash_key, req->iv,
|
||||
TWEAK_SIZE / POLY1305_BLOCK_SIZE);
|
||||
TWEAK_SIZE / POLY1305_BLOCK_SIZE, 1);
|
||||
|
||||
poly1305_core_emit(&state, &rctx->header_hash);
|
||||
}
|
||||
|
||||
@ -33,6 +33,7 @@
|
||||
#include <asm/unaligned.h>
|
||||
#include <crypto/algapi.h>
|
||||
#include <crypto/internal/hash.h>
|
||||
#include <crypto/internal/poly1305.h>
|
||||
#include <crypto/nhpoly1305.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/kernel.h>
|
||||
@ -78,7 +79,7 @@ static void process_nh_hash_value(struct nhpoly1305_state *state,
|
||||
BUILD_BUG_ON(NH_HASH_BYTES % POLY1305_BLOCK_SIZE != 0);
|
||||
|
||||
poly1305_core_blocks(&state->poly_state, &key->poly_key, state->nh_hash,
|
||||
NH_HASH_BYTES / POLY1305_BLOCK_SIZE);
|
||||
NH_HASH_BYTES / POLY1305_BLOCK_SIZE, 1);
|
||||
}
|
||||
|
||||
/*
|
||||
|
||||
@ -13,27 +13,12 @@
|
||||
|
||||
#include <crypto/algapi.h>
|
||||
#include <crypto/internal/hash.h>
|
||||
#include <crypto/poly1305.h>
|
||||
#include <crypto/internal/poly1305.h>
|
||||
#include <linux/crypto.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <asm/unaligned.h>
|
||||
|
||||
static inline u64 mlt(u64 a, u64 b)
|
||||
{
|
||||
return a * b;
|
||||
}
|
||||
|
||||
static inline u32 sr(u64 v, u_char n)
|
||||
{
|
||||
return v >> n;
|
||||
}
|
||||
|
||||
static inline u32 and(u32 v, u32 mask)
|
||||
{
|
||||
return v & mask;
|
||||
}
|
||||
|
||||
int crypto_poly1305_init(struct shash_desc *desc)
|
||||
{
|
||||
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
||||
@ -47,124 +32,8 @@ int crypto_poly1305_init(struct shash_desc *desc)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(crypto_poly1305_init);
|
||||
|
||||
void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key)
|
||||
{
|
||||
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
|
||||
key->r[0] = (get_unaligned_le32(raw_key + 0) >> 0) & 0x3ffffff;
|
||||
key->r[1] = (get_unaligned_le32(raw_key + 3) >> 2) & 0x3ffff03;
|
||||
key->r[2] = (get_unaligned_le32(raw_key + 6) >> 4) & 0x3ffc0ff;
|
||||
key->r[3] = (get_unaligned_le32(raw_key + 9) >> 6) & 0x3f03fff;
|
||||
key->r[4] = (get_unaligned_le32(raw_key + 12) >> 8) & 0x00fffff;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(poly1305_core_setkey);
|
||||
|
||||
/*
|
||||
* Poly1305 requires a unique key for each tag, which implies that we can't set
|
||||
* it on the tfm that gets accessed by multiple users simultaneously. Instead we
|
||||
* expect the key as the first 32 bytes in the update() call.
|
||||
*/
|
||||
unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
|
||||
const u8 *src, unsigned int srclen)
|
||||
{
|
||||
if (!dctx->sset) {
|
||||
if (!dctx->rset && srclen >= POLY1305_BLOCK_SIZE) {
|
||||
poly1305_core_setkey(&dctx->r, src);
|
||||
src += POLY1305_BLOCK_SIZE;
|
||||
srclen -= POLY1305_BLOCK_SIZE;
|
||||
dctx->rset = true;
|
||||
}
|
||||
if (srclen >= POLY1305_BLOCK_SIZE) {
|
||||
dctx->s[0] = get_unaligned_le32(src + 0);
|
||||
dctx->s[1] = get_unaligned_le32(src + 4);
|
||||
dctx->s[2] = get_unaligned_le32(src + 8);
|
||||
dctx->s[3] = get_unaligned_le32(src + 12);
|
||||
src += POLY1305_BLOCK_SIZE;
|
||||
srclen -= POLY1305_BLOCK_SIZE;
|
||||
dctx->sset = true;
|
||||
}
|
||||
}
|
||||
return srclen;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(crypto_poly1305_setdesckey);
|
||||
|
||||
static void poly1305_blocks_internal(struct poly1305_state *state,
|
||||
const struct poly1305_key *key,
|
||||
const void *src, unsigned int nblocks,
|
||||
u32 hibit)
|
||||
{
|
||||
u32 r0, r1, r2, r3, r4;
|
||||
u32 s1, s2, s3, s4;
|
||||
u32 h0, h1, h2, h3, h4;
|
||||
u64 d0, d1, d2, d3, d4;
|
||||
|
||||
if (!nblocks)
|
||||
return;
|
||||
|
||||
r0 = key->r[0];
|
||||
r1 = key->r[1];
|
||||
r2 = key->r[2];
|
||||
r3 = key->r[3];
|
||||
r4 = key->r[4];
|
||||
|
||||
s1 = r1 * 5;
|
||||
s2 = r2 * 5;
|
||||
s3 = r3 * 5;
|
||||
s4 = r4 * 5;
|
||||
|
||||
h0 = state->h[0];
|
||||
h1 = state->h[1];
|
||||
h2 = state->h[2];
|
||||
h3 = state->h[3];
|
||||
h4 = state->h[4];
|
||||
|
||||
do {
|
||||
/* h += m[i] */
|
||||
h0 += (get_unaligned_le32(src + 0) >> 0) & 0x3ffffff;
|
||||
h1 += (get_unaligned_le32(src + 3) >> 2) & 0x3ffffff;
|
||||
h2 += (get_unaligned_le32(src + 6) >> 4) & 0x3ffffff;
|
||||
h3 += (get_unaligned_le32(src + 9) >> 6) & 0x3ffffff;
|
||||
h4 += (get_unaligned_le32(src + 12) >> 8) | hibit;
|
||||
|
||||
/* h *= r */
|
||||
d0 = mlt(h0, r0) + mlt(h1, s4) + mlt(h2, s3) +
|
||||
mlt(h3, s2) + mlt(h4, s1);
|
||||
d1 = mlt(h0, r1) + mlt(h1, r0) + mlt(h2, s4) +
|
||||
mlt(h3, s3) + mlt(h4, s2);
|
||||
d2 = mlt(h0, r2) + mlt(h1, r1) + mlt(h2, r0) +
|
||||
mlt(h3, s4) + mlt(h4, s3);
|
||||
d3 = mlt(h0, r3) + mlt(h1, r2) + mlt(h2, r1) +
|
||||
mlt(h3, r0) + mlt(h4, s4);
|
||||
d4 = mlt(h0, r4) + mlt(h1, r3) + mlt(h2, r2) +
|
||||
mlt(h3, r1) + mlt(h4, r0);
|
||||
|
||||
/* (partial) h %= p */
|
||||
d1 += sr(d0, 26); h0 = and(d0, 0x3ffffff);
|
||||
d2 += sr(d1, 26); h1 = and(d1, 0x3ffffff);
|
||||
d3 += sr(d2, 26); h2 = and(d2, 0x3ffffff);
|
||||
d4 += sr(d3, 26); h3 = and(d3, 0x3ffffff);
|
||||
h0 += sr(d4, 26) * 5; h4 = and(d4, 0x3ffffff);
|
||||
h1 += h0 >> 26; h0 = h0 & 0x3ffffff;
|
||||
|
||||
src += POLY1305_BLOCK_SIZE;
|
||||
} while (--nblocks);
|
||||
|
||||
state->h[0] = h0;
|
||||
state->h[1] = h1;
|
||||
state->h[2] = h2;
|
||||
state->h[3] = h3;
|
||||
state->h[4] = h4;
|
||||
}
|
||||
|
||||
void poly1305_core_blocks(struct poly1305_state *state,
|
||||
const struct poly1305_key *key,
|
||||
const void *src, unsigned int nblocks)
|
||||
{
|
||||
poly1305_blocks_internal(state, key, src, nblocks, 1 << 24);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(poly1305_core_blocks);
|
||||
|
||||
static void poly1305_blocks(struct poly1305_desc_ctx *dctx,
|
||||
const u8 *src, unsigned int srclen, u32 hibit)
|
||||
static void poly1305_blocks(struct poly1305_desc_ctx *dctx, const u8 *src,
|
||||
unsigned int srclen)
|
||||
{
|
||||
unsigned int datalen;
|
||||
|
||||
@ -174,8 +43,8 @@ static void poly1305_blocks(struct poly1305_desc_ctx *dctx,
|
||||
srclen = datalen;
|
||||
}
|
||||
|
||||
poly1305_blocks_internal(&dctx->h, &dctx->r,
|
||||
src, srclen / POLY1305_BLOCK_SIZE, hibit);
|
||||
poly1305_core_blocks(&dctx->h, &dctx->r, src,
|
||||
srclen / POLY1305_BLOCK_SIZE, 1);
|
||||
}
|
||||
|
||||
int crypto_poly1305_update(struct shash_desc *desc,
|
||||
@ -193,13 +62,13 @@ int crypto_poly1305_update(struct shash_desc *desc,
|
||||
|
||||
if (dctx->buflen == POLY1305_BLOCK_SIZE) {
|
||||
poly1305_blocks(dctx, dctx->buf,
|
||||
POLY1305_BLOCK_SIZE, 1 << 24);
|
||||
POLY1305_BLOCK_SIZE);
|
||||
dctx->buflen = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
|
||||
poly1305_blocks(dctx, src, srclen, 1 << 24);
|
||||
poly1305_blocks(dctx, src, srclen);
|
||||
src += srclen - (srclen % POLY1305_BLOCK_SIZE);
|
||||
srclen %= POLY1305_BLOCK_SIZE;
|
||||
}
|
||||
@ -213,54 +82,6 @@ int crypto_poly1305_update(struct shash_desc *desc,
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(crypto_poly1305_update);
|
||||
|
||||
void poly1305_core_emit(const struct poly1305_state *state, void *dst)
|
||||
{
|
||||
u32 h0, h1, h2, h3, h4;
|
||||
u32 g0, g1, g2, g3, g4;
|
||||
u32 mask;
|
||||
|
||||
/* fully carry h */
|
||||
h0 = state->h[0];
|
||||
h1 = state->h[1];
|
||||
h2 = state->h[2];
|
||||
h3 = state->h[3];
|
||||
h4 = state->h[4];
|
||||
|
||||
h2 += (h1 >> 26); h1 = h1 & 0x3ffffff;
|
||||
h3 += (h2 >> 26); h2 = h2 & 0x3ffffff;
|
||||
h4 += (h3 >> 26); h3 = h3 & 0x3ffffff;
|
||||
h0 += (h4 >> 26) * 5; h4 = h4 & 0x3ffffff;
|
||||
h1 += (h0 >> 26); h0 = h0 & 0x3ffffff;
|
||||
|
||||
/* compute h + -p */
|
||||
g0 = h0 + 5;
|
||||
g1 = h1 + (g0 >> 26); g0 &= 0x3ffffff;
|
||||
g2 = h2 + (g1 >> 26); g1 &= 0x3ffffff;
|
||||
g3 = h3 + (g2 >> 26); g2 &= 0x3ffffff;
|
||||
g4 = h4 + (g3 >> 26) - (1 << 26); g3 &= 0x3ffffff;
|
||||
|
||||
/* select h if h < p, or h + -p if h >= p */
|
||||
mask = (g4 >> ((sizeof(u32) * 8) - 1)) - 1;
|
||||
g0 &= mask;
|
||||
g1 &= mask;
|
||||
g2 &= mask;
|
||||
g3 &= mask;
|
||||
g4 &= mask;
|
||||
mask = ~mask;
|
||||
h0 = (h0 & mask) | g0;
|
||||
h1 = (h1 & mask) | g1;
|
||||
h2 = (h2 & mask) | g2;
|
||||
h3 = (h3 & mask) | g3;
|
||||
h4 = (h4 & mask) | g4;
|
||||
|
||||
/* h = h % (2^128) */
|
||||
put_unaligned_le32((h0 >> 0) | (h1 << 26), dst + 0);
|
||||
put_unaligned_le32((h1 >> 6) | (h2 << 20), dst + 4);
|
||||
put_unaligned_le32((h2 >> 12) | (h3 << 14), dst + 8);
|
||||
put_unaligned_le32((h3 >> 18) | (h4 << 8), dst + 12);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(poly1305_core_emit);
|
||||
|
||||
int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)
|
||||
{
|
||||
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
||||
@ -274,7 +95,7 @@ int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)
|
||||
dctx->buf[dctx->buflen++] = 1;
|
||||
memset(dctx->buf + dctx->buflen, 0,
|
||||
POLY1305_BLOCK_SIZE - dctx->buflen);
|
||||
poly1305_blocks(dctx, dctx->buf, POLY1305_BLOCK_SIZE, 0);
|
||||
poly1305_core_blocks(&dctx->h, &dctx->r, dctx->buf, 1, 0);
|
||||
}
|
||||
|
||||
poly1305_core_emit(&dctx->h, digest);
|
||||
|
||||
67
include/crypto/internal/poly1305.h
Normal file
67
include/crypto/internal/poly1305.h
Normal file
@ -0,0 +1,67 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
/*
|
||||
* Common values for the Poly1305 algorithm
|
||||
*/
|
||||
|
||||
#ifndef _CRYPTO_INTERNAL_POLY1305_H
|
||||
#define _CRYPTO_INTERNAL_POLY1305_H
|
||||
|
||||
#include <asm/unaligned.h>
|
||||
#include <linux/types.h>
|
||||
#include <crypto/poly1305.h>
|
||||
|
||||
struct shash_desc;
|
||||
|
||||
/*
|
||||
* Poly1305 core functions. These implement the ε-almost-∆-universal hash
|
||||
* function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
|
||||
* ("s key") at the end. They also only support block-aligned inputs.
|
||||
*/
|
||||
void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key);
|
||||
static inline void poly1305_core_init(struct poly1305_state *state)
|
||||
{
|
||||
*state = (struct poly1305_state){};
|
||||
}
|
||||
|
||||
void poly1305_core_blocks(struct poly1305_state *state,
|
||||
const struct poly1305_key *key, const void *src,
|
||||
unsigned int nblocks, u32 hibit);
|
||||
void poly1305_core_emit(const struct poly1305_state *state, void *dst);
|
||||
|
||||
/* Crypto API helper functions for the Poly1305 MAC */
|
||||
int crypto_poly1305_init(struct shash_desc *desc);
|
||||
|
||||
int crypto_poly1305_update(struct shash_desc *desc,
|
||||
const u8 *src, unsigned int srclen);
|
||||
int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);
|
||||
|
||||
/*
|
||||
* Poly1305 requires a unique key for each tag, which implies that we can't set
|
||||
* it on the tfm that gets accessed by multiple users simultaneously. Instead we
|
||||
* expect the key as the first 32 bytes in the update() call.
|
||||
*/
|
||||
static inline
|
||||
unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
|
||||
const u8 *src, unsigned int srclen)
|
||||
{
|
||||
if (!dctx->sset) {
|
||||
if (!dctx->rset && srclen >= POLY1305_BLOCK_SIZE) {
|
||||
poly1305_core_setkey(&dctx->r, src);
|
||||
src += POLY1305_BLOCK_SIZE;
|
||||
srclen -= POLY1305_BLOCK_SIZE;
|
||||
dctx->rset = true;
|
||||
}
|
||||
if (srclen >= POLY1305_BLOCK_SIZE) {
|
||||
dctx->s[0] = get_unaligned_le32(src + 0);
|
||||
dctx->s[1] = get_unaligned_le32(src + 4);
|
||||
dctx->s[2] = get_unaligned_le32(src + 8);
|
||||
dctx->s[3] = get_unaligned_le32(src + 12);
|
||||
src += POLY1305_BLOCK_SIZE;
|
||||
srclen -= POLY1305_BLOCK_SIZE;
|
||||
dctx->sset = true;
|
||||
}
|
||||
}
|
||||
return srclen;
|
||||
}
|
||||
|
||||
#endif
|
||||
@ -38,27 +38,4 @@ struct poly1305_desc_ctx {
|
||||
bool sset;
|
||||
};
|
||||
|
||||
/*
|
||||
* Poly1305 core functions. These implement the ε-almost-∆-universal hash
|
||||
* function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
|
||||
* ("s key") at the end. They also only support block-aligned inputs.
|
||||
*/
|
||||
void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key);
|
||||
static inline void poly1305_core_init(struct poly1305_state *state)
|
||||
{
|
||||
memset(state->h, 0, sizeof(state->h));
|
||||
}
|
||||
void poly1305_core_blocks(struct poly1305_state *state,
|
||||
const struct poly1305_key *key,
|
||||
const void *src, unsigned int nblocks);
|
||||
void poly1305_core_emit(const struct poly1305_state *state, void *dst);
|
||||
|
||||
/* Crypto API helper functions for the Poly1305 MAC */
|
||||
int crypto_poly1305_init(struct shash_desc *desc);
|
||||
unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
|
||||
const u8 *src, unsigned int srclen);
|
||||
int crypto_poly1305_update(struct shash_desc *desc,
|
||||
const u8 *src, unsigned int srclen);
|
||||
int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);
|
||||
|
||||
#endif
|
||||
|
||||
@ -37,5 +37,8 @@ config CRYPTO_LIB_CHACHA
|
||||
config CRYPTO_LIB_DES
|
||||
tristate
|
||||
|
||||
config CRYPTO_LIB_POLY1305_GENERIC
|
||||
tristate
|
||||
|
||||
config CRYPTO_LIB_SHA256
|
||||
tristate
|
||||
|
||||
@ -13,5 +13,8 @@ libarc4-y := arc4.o
|
||||
obj-$(CONFIG_CRYPTO_LIB_DES) += libdes.o
|
||||
libdes-y := des.o
|
||||
|
||||
obj-$(CONFIG_CRYPTO_LIB_POLY1305_GENERIC) += libpoly1305.o
|
||||
libpoly1305-y := poly1305.o
|
||||
|
||||
obj-$(CONFIG_CRYPTO_LIB_SHA256) += libsha256.o
|
||||
libsha256-y := sha256.o
|
||||
|
||||
158
lib/crypto/poly1305.c
Normal file
158
lib/crypto/poly1305.c
Normal file
@ -0,0 +1,158 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-or-later
|
||||
/*
|
||||
* Poly1305 authenticator algorithm, RFC7539
|
||||
*
|
||||
* Copyright (C) 2015 Martin Willi
|
||||
*
|
||||
* Based on public domain code by Andrew Moon and Daniel J. Bernstein.
|
||||
*/
|
||||
|
||||
#include <crypto/internal/poly1305.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <asm/unaligned.h>
|
||||
|
||||
static inline u64 mlt(u64 a, u64 b)
|
||||
{
|
||||
return a * b;
|
||||
}
|
||||
|
||||
static inline u32 sr(u64 v, u_char n)
|
||||
{
|
||||
return v >> n;
|
||||
}
|
||||
|
||||
static inline u32 and(u32 v, u32 mask)
|
||||
{
|
||||
return v & mask;
|
||||
}
|
||||
|
||||
void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key)
|
||||
{
|
||||
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
|
||||
key->r[0] = (get_unaligned_le32(raw_key + 0) >> 0) & 0x3ffffff;
|
||||
key->r[1] = (get_unaligned_le32(raw_key + 3) >> 2) & 0x3ffff03;
|
||||
key->r[2] = (get_unaligned_le32(raw_key + 6) >> 4) & 0x3ffc0ff;
|
||||
key->r[3] = (get_unaligned_le32(raw_key + 9) >> 6) & 0x3f03fff;
|
||||
key->r[4] = (get_unaligned_le32(raw_key + 12) >> 8) & 0x00fffff;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(poly1305_core_setkey);
|
||||
|
||||
void poly1305_core_blocks(struct poly1305_state *state,
|
||||
const struct poly1305_key *key, const void *src,
|
||||
unsigned int nblocks, u32 hibit)
|
||||
{
|
||||
u32 r0, r1, r2, r3, r4;
|
||||
u32 s1, s2, s3, s4;
|
||||
u32 h0, h1, h2, h3, h4;
|
||||
u64 d0, d1, d2, d3, d4;
|
||||
|
||||
if (!nblocks)
|
||||
return;
|
||||
|
||||
r0 = key->r[0];
|
||||
r1 = key->r[1];
|
||||
r2 = key->r[2];
|
||||
r3 = key->r[3];
|
||||
r4 = key->r[4];
|
||||
|
||||
s1 = r1 * 5;
|
||||
s2 = r2 * 5;
|
||||
s3 = r3 * 5;
|
||||
s4 = r4 * 5;
|
||||
|
||||
h0 = state->h[0];
|
||||
h1 = state->h[1];
|
||||
h2 = state->h[2];
|
||||
h3 = state->h[3];
|
||||
h4 = state->h[4];
|
||||
|
||||
do {
|
||||
/* h += m[i] */
|
||||
h0 += (get_unaligned_le32(src + 0) >> 0) & 0x3ffffff;
|
||||
h1 += (get_unaligned_le32(src + 3) >> 2) & 0x3ffffff;
|
||||
h2 += (get_unaligned_le32(src + 6) >> 4) & 0x3ffffff;
|
||||
h3 += (get_unaligned_le32(src + 9) >> 6) & 0x3ffffff;
|
||||
h4 += (get_unaligned_le32(src + 12) >> 8) | (hibit << 24);
|
||||
|
||||
/* h *= r */
|
||||
d0 = mlt(h0, r0) + mlt(h1, s4) + mlt(h2, s3) +
|
||||
mlt(h3, s2) + mlt(h4, s1);
|
||||
d1 = mlt(h0, r1) + mlt(h1, r0) + mlt(h2, s4) +
|
||||
mlt(h3, s3) + mlt(h4, s2);
|
||||
d2 = mlt(h0, r2) + mlt(h1, r1) + mlt(h2, r0) +
|
||||
mlt(h3, s4) + mlt(h4, s3);
|
||||
d3 = mlt(h0, r3) + mlt(h1, r2) + mlt(h2, r1) +
|
||||
mlt(h3, r0) + mlt(h4, s4);
|
||||
d4 = mlt(h0, r4) + mlt(h1, r3) + mlt(h2, r2) +
|
||||
mlt(h3, r1) + mlt(h4, r0);
|
||||
|
||||
/* (partial) h %= p */
|
||||
d1 += sr(d0, 26); h0 = and(d0, 0x3ffffff);
|
||||
d2 += sr(d1, 26); h1 = and(d1, 0x3ffffff);
|
||||
d3 += sr(d2, 26); h2 = and(d2, 0x3ffffff);
|
||||
d4 += sr(d3, 26); h3 = and(d3, 0x3ffffff);
|
||||
h0 += sr(d4, 26) * 5; h4 = and(d4, 0x3ffffff);
|
||||
h1 += h0 >> 26; h0 = h0 & 0x3ffffff;
|
||||
|
||||
src += POLY1305_BLOCK_SIZE;
|
||||
} while (--nblocks);
|
||||
|
||||
state->h[0] = h0;
|
||||
state->h[1] = h1;
|
||||
state->h[2] = h2;
|
||||
state->h[3] = h3;
|
||||
state->h[4] = h4;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(poly1305_core_blocks);
|
||||
|
||||
void poly1305_core_emit(const struct poly1305_state *state, void *dst)
|
||||
{
|
||||
u32 h0, h1, h2, h3, h4;
|
||||
u32 g0, g1, g2, g3, g4;
|
||||
u32 mask;
|
||||
|
||||
/* fully carry h */
|
||||
h0 = state->h[0];
|
||||
h1 = state->h[1];
|
||||
h2 = state->h[2];
|
||||
h3 = state->h[3];
|
||||
h4 = state->h[4];
|
||||
|
||||
h2 += (h1 >> 26); h1 = h1 & 0x3ffffff;
|
||||
h3 += (h2 >> 26); h2 = h2 & 0x3ffffff;
|
||||
h4 += (h3 >> 26); h3 = h3 & 0x3ffffff;
|
||||
h0 += (h4 >> 26) * 5; h4 = h4 & 0x3ffffff;
|
||||
h1 += (h0 >> 26); h0 = h0 & 0x3ffffff;
|
||||
|
||||
/* compute h + -p */
|
||||
g0 = h0 + 5;
|
||||
g1 = h1 + (g0 >> 26); g0 &= 0x3ffffff;
|
||||
g2 = h2 + (g1 >> 26); g1 &= 0x3ffffff;
|
||||
g3 = h3 + (g2 >> 26); g2 &= 0x3ffffff;
|
||||
g4 = h4 + (g3 >> 26) - (1 << 26); g3 &= 0x3ffffff;
|
||||
|
||||
/* select h if h < p, or h + -p if h >= p */
|
||||
mask = (g4 >> ((sizeof(u32) * 8) - 1)) - 1;
|
||||
g0 &= mask;
|
||||
g1 &= mask;
|
||||
g2 &= mask;
|
||||
g3 &= mask;
|
||||
g4 &= mask;
|
||||
mask = ~mask;
|
||||
h0 = (h0 & mask) | g0;
|
||||
h1 = (h1 & mask) | g1;
|
||||
h2 = (h2 & mask) | g2;
|
||||
h3 = (h3 & mask) | g3;
|
||||
h4 = (h4 & mask) | g4;
|
||||
|
||||
/* h = h % (2^128) */
|
||||
put_unaligned_le32((h0 >> 0) | (h1 << 26), dst + 0);
|
||||
put_unaligned_le32((h1 >> 6) | (h2 << 20), dst + 4);
|
||||
put_unaligned_le32((h2 >> 12) | (h3 << 14), dst + 8);
|
||||
put_unaligned_le32((h3 >> 18) | (h4 << 8), dst + 12);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(poly1305_core_emit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
|
||||
Loading…
Reference in New Issue
Block a user