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linux-next/crypto/aegis128-core.c
Eric Biggers 674f368a95 crypto: remove CRYPTO_TFM_RES_BAD_KEY_LEN 
The CRYPTO_TFM_RES_BAD_KEY_LEN flag was apparently meant as a way to
make the ->setkey() functions provide more information about errors.

However, no one actually checks for this flag, which makes it pointless.

Also, many algorithms fail to set this flag when given a bad length key.
Reviewing just the generic implementations, this is the case for
aes-fixed-time, cbcmac, echainiv, nhpoly1305, pcrypt, rfc3686, rfc4309,
rfc7539, rfc7539esp, salsa20, seqiv, and xcbc.  But there are probably
many more in arch/*/crypto/ and drivers/crypto/.

Some algorithms can even set this flag when the key is the correct
length.  For example, authenc and authencesn set it when the key payload
is malformed in any way (not just a bad length), the atmel-sha and ccree
drivers can set it if a memory allocation fails, and the chelsio driver
sets it for bad auth tag lengths, not just bad key lengths.

So even if someone actually wanted to start checking this flag (which
seems unlikely, since it's been unused for a long time), there would be
a lot of work needed to get it working correctly.  But it would probably
be much better to go back to the drawing board and just define different
return values, like -EINVAL if the key is invalid for the algorithm vs.
-EKEYREJECTED if the key was rejected by a policy like "no weak keys".
That would be much simpler, less error-prone, and easier to test.

So just remove this flag.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2020-01-09 11:30:53 +08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* The AEGIS-128 Authenticated-Encryption Algorithm
*
* Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
*/
#include <crypto/algapi.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <asm/simd.h>
#include "aegis.h"
#define AEGIS128_NONCE_SIZE 16
#define AEGIS128_STATE_BLOCKS 5
#define AEGIS128_KEY_SIZE 16
#define AEGIS128_MIN_AUTH_SIZE 8
#define AEGIS128_MAX_AUTH_SIZE 16
struct aegis_state {
union aegis_block blocks[AEGIS128_STATE_BLOCKS];
};
struct aegis_ctx {
union aegis_block key;
};
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_simd);
static const union aegis_block crypto_aegis_const[2] = {
{ .words64 = {
cpu_to_le64(U64_C(0x0d08050302010100)),
cpu_to_le64(U64_C(0x6279e99059372215)),
} },
{ .words64 = {
cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
cpu_to_le64(U64_C(0xdd28b57342311120)),
} },
};
static bool aegis128_do_simd(void)
{
#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
if (static_branch_likely(&have_simd))
return crypto_simd_usable();
#endif
return false;
}
bool crypto_aegis128_have_simd(void);
void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
void crypto_aegis128_init_simd(struct aegis_state *state,
const union aegis_block *key,
const u8 *iv);
void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size);
void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size);
void crypto_aegis128_final_simd(struct aegis_state *state,
union aegis_block *tag_xor,
u64 assoclen, u64 cryptlen);
static void crypto_aegis128_update(struct aegis_state *state)
{
union aegis_block tmp;
unsigned int i;
tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1];
for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--)
crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
&state->blocks[i]);
crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
}
static void crypto_aegis128_update_a(struct aegis_state *state,
const union aegis_block *msg)
{
if (aegis128_do_simd()) {
crypto_aegis128_update_simd(state, msg);
return;
}
crypto_aegis128_update(state);
crypto_aegis_block_xor(&state->blocks[0], msg);
}
static void crypto_aegis128_update_u(struct aegis_state *state, const void *msg)
{
if (aegis128_do_simd()) {
crypto_aegis128_update_simd(state, msg);
return;
}
crypto_aegis128_update(state);
crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
}
static void crypto_aegis128_init(struct aegis_state *state,
const union aegis_block *key,
const u8 *iv)
{
union aegis_block key_iv;
unsigned int i;
key_iv = *key;
crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);
state->blocks[0] = key_iv;
state->blocks[1] = crypto_aegis_const[1];
state->blocks[2] = crypto_aegis_const[0];
state->blocks[3] = *key;
state->blocks[4] = *key;
crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);
for (i = 0; i < 5; i++) {
crypto_aegis128_update_a(state, key);
crypto_aegis128_update_a(state, &key_iv);
}
}
static void crypto_aegis128_ad(struct aegis_state *state,
const u8 *src, unsigned int size)
{
if (AEGIS_ALIGNED(src)) {
const union aegis_block *src_blk =
(const union aegis_block *)src;
while (size >= AEGIS_BLOCK_SIZE) {
crypto_aegis128_update_a(state, src_blk);
size -= AEGIS_BLOCK_SIZE;
src_blk++;
}
} else {
while (size >= AEGIS_BLOCK_SIZE) {
crypto_aegis128_update_u(state, src);
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
}
}
}
static void crypto_aegis128_encrypt_chunk(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size)
{
union aegis_block tmp;
if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
while (size >= AEGIS_BLOCK_SIZE) {
union aegis_block *dst_blk =
(union aegis_block *)dst;
const union aegis_block *src_blk =
(const union aegis_block *)src;
tmp = state->blocks[2];
crypto_aegis_block_and(&tmp, &state->blocks[3]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_aegis_block_xor(&tmp, src_blk);
crypto_aegis128_update_a(state, src_blk);
*dst_blk = tmp;
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
dst += AEGIS_BLOCK_SIZE;
}
} else {
while (size >= AEGIS_BLOCK_SIZE) {
tmp = state->blocks[2];
crypto_aegis_block_and(&tmp, &state->blocks[3]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
crypto_aegis128_update_u(state, src);
memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
dst += AEGIS_BLOCK_SIZE;
}
}
if (size > 0) {
union aegis_block msg = {};
memcpy(msg.bytes, src, size);
tmp = state->blocks[2];
crypto_aegis_block_and(&tmp, &state->blocks[3]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_aegis128_update_a(state, &msg);
crypto_aegis_block_xor(&msg, &tmp);
memcpy(dst, msg.bytes, size);
}
}
static void crypto_aegis128_decrypt_chunk(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size)
{
union aegis_block tmp;
if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
while (size >= AEGIS_BLOCK_SIZE) {
union aegis_block *dst_blk =
(union aegis_block *)dst;
const union aegis_block *src_blk =
(const union aegis_block *)src;
tmp = state->blocks[2];
crypto_aegis_block_and(&tmp, &state->blocks[3]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_aegis_block_xor(&tmp, src_blk);
crypto_aegis128_update_a(state, &tmp);
*dst_blk = tmp;
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
dst += AEGIS_BLOCK_SIZE;
}
} else {
while (size >= AEGIS_BLOCK_SIZE) {
tmp = state->blocks[2];
crypto_aegis_block_and(&tmp, &state->blocks[3]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
crypto_aegis128_update_a(state, &tmp);
memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
dst += AEGIS_BLOCK_SIZE;
}
}
if (size > 0) {
union aegis_block msg = {};
memcpy(msg.bytes, src, size);
tmp = state->blocks[2];
crypto_aegis_block_and(&tmp, &state->blocks[3]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_aegis_block_xor(&msg, &tmp);
memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
crypto_aegis128_update_a(state, &msg);
memcpy(dst, msg.bytes, size);
}
}
static void crypto_aegis128_process_ad(struct aegis_state *state,
struct scatterlist *sg_src,
unsigned int assoclen)
{
struct scatter_walk walk;
union aegis_block buf;
unsigned int pos = 0;
scatterwalk_start(&walk, sg_src);
while (assoclen != 0) {
unsigned int size = scatterwalk_clamp(&walk, assoclen);
unsigned int left = size;
void *mapped = scatterwalk_map(&walk);
const u8 *src = (const u8 *)mapped;
if (pos + size >= AEGIS_BLOCK_SIZE) {
if (pos > 0) {
unsigned int fill = AEGIS_BLOCK_SIZE - pos;
memcpy(buf.bytes + pos, src, fill);
crypto_aegis128_update_a(state, &buf);
pos = 0;
left -= fill;
src += fill;
}
crypto_aegis128_ad(state, src, left);
src += left & ~(AEGIS_BLOCK_SIZE - 1);
left &= AEGIS_BLOCK_SIZE - 1;
}
memcpy(buf.bytes + pos, src, left);
pos += left;
assoclen -= size;
scatterwalk_unmap(mapped);
scatterwalk_advance(&walk, size);
scatterwalk_done(&walk, 0, assoclen);
}
if (pos > 0) {
memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
crypto_aegis128_update_a(state, &buf);
}
}
static __always_inline
int crypto_aegis128_process_crypt(struct aegis_state *state,
struct aead_request *req,
struct skcipher_walk *walk,
void (*crypt)(struct aegis_state *state,
u8 *dst, const u8 *src,
unsigned int size))
{
int err = 0;
while (walk->nbytes) {
unsigned int nbytes = walk->nbytes;
if (nbytes < walk->total)
nbytes = round_down(nbytes, walk->stride);
crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes);
err = skcipher_walk_done(walk, walk->nbytes - nbytes);
}
return err;
}
static void crypto_aegis128_final(struct aegis_state *state,
union aegis_block *tag_xor,
u64 assoclen, u64 cryptlen)
{
u64 assocbits = assoclen * 8;
u64 cryptbits = cryptlen * 8;
union aegis_block tmp;
unsigned int i;
tmp.words64[0] = cpu_to_le64(assocbits);
tmp.words64[1] = cpu_to_le64(cryptbits);
crypto_aegis_block_xor(&tmp, &state->blocks[3]);
for (i = 0; i < 7; i++)
crypto_aegis128_update_a(state, &tmp);
for (i = 0; i < AEGIS128_STATE_BLOCKS; i++)
crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
}
static int crypto_aegis128_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
struct aegis_ctx *ctx = crypto_aead_ctx(aead);
if (keylen != AEGIS128_KEY_SIZE)
return -EINVAL;
memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
return 0;
}
static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
unsigned int authsize)
{
if (authsize > AEGIS128_MAX_AUTH_SIZE)
return -EINVAL;
if (authsize < AEGIS128_MIN_AUTH_SIZE)
return -EINVAL;
return 0;
}
static int crypto_aegis128_encrypt(struct aead_request *req)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
union aegis_block tag = {};
unsigned int authsize = crypto_aead_authsize(tfm);
struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
unsigned int cryptlen = req->cryptlen;
struct skcipher_walk walk;
struct aegis_state state;
skcipher_walk_aead_encrypt(&walk, req, false);
if (aegis128_do_simd()) {
crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_encrypt_chunk_simd);
crypto_aegis128_final_simd(&state, &tag, req->assoclen,
cryptlen);
} else {
crypto_aegis128_init(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_encrypt_chunk);
crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
}
scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
authsize, 1);
return 0;
}
static int crypto_aegis128_decrypt(struct aead_request *req)
{
static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {};
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
union aegis_block tag;
unsigned int authsize = crypto_aead_authsize(tfm);
unsigned int cryptlen = req->cryptlen - authsize;
struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
struct skcipher_walk walk;
struct aegis_state state;
scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
authsize, 0);
skcipher_walk_aead_decrypt(&walk, req, false);
if (aegis128_do_simd()) {
crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_decrypt_chunk_simd);
crypto_aegis128_final_simd(&state, &tag, req->assoclen,
cryptlen);
} else {
crypto_aegis128_init(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_decrypt_chunk);
crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
}
return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
}
static struct aead_alg crypto_aegis128_alg = {
.setkey = crypto_aegis128_setkey,
.setauthsize = crypto_aegis128_setauthsize,
.encrypt = crypto_aegis128_encrypt,
.decrypt = crypto_aegis128_decrypt,
.ivsize = AEGIS128_NONCE_SIZE,
.maxauthsize = AEGIS128_MAX_AUTH_SIZE,
.chunksize = AEGIS_BLOCK_SIZE,
.base = {
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct aegis_ctx),
.cra_alignmask = 0,
.cra_priority = 100,
.cra_name = "aegis128",
.cra_driver_name = "aegis128-generic",
.cra_module = THIS_MODULE,
}
};
static int __init crypto_aegis128_module_init(void)
{
if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
crypto_aegis128_have_simd())
static_branch_enable(&have_simd);
return crypto_register_aead(&crypto_aegis128_alg);
}
static void __exit crypto_aegis128_module_exit(void)
{
crypto_unregister_aead(&crypto_aegis128_alg);
}
subsys_initcall(crypto_aegis128_module_init);
module_exit(crypto_aegis128_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
MODULE_ALIAS_CRYPTO("aegis128");
MODULE_ALIAS_CRYPTO("aegis128-generic");
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