help
Support for the AEGIS-128 dedicated AEAD algorithm.
-config CRYPTO_AEGIS128_SIMD
- bool "Support SIMD acceleration for AEGIS-128"
- depends on CRYPTO_AEGIS128 && ((ARM || ARM64) && KERNEL_MODE_NEON)
- default y
-
config CRYPTO_AEGIS128_AESNI_SSE2
tristate "AEGIS-128 AEAD algorithm (x86_64 AESNI+SSE2 implementation)"
depends on X86 && 64BIT
obj-$(CONFIG_CRYPTO_CCM) += ccm.o
obj-$(CONFIG_CRYPTO_CHACHA20POLY1305) += chacha20poly1305.o
obj-$(CONFIG_CRYPTO_AEGIS128) += aegis128.o
-aegis128-y := aegis128-core.o
-
-ifeq ($(ARCH),arm)
-CFLAGS_aegis128-neon-inner.o += -ffreestanding -march=armv7-a -mfloat-abi=softfp -mfpu=crypto-neon-fp-armv8
-aegis128-$(CONFIG_CRYPTO_AEGIS128_SIMD) += aegis128-neon.o aegis128-neon-inner.o
-endif
-ifeq ($(ARCH),arm64)
-CFLAGS_aegis128-neon-inner.o += -ffreestanding -mcpu=generic+crypto
-CFLAGS_REMOVE_aegis128-neon-inner.o += -mgeneral-regs-only
-aegis128-$(CONFIG_CRYPTO_AEGIS128_SIMD) += aegis128-neon.o aegis128-neon-inner.o
-endif
-
obj-$(CONFIG_CRYPTO_PCRYPT) += pcrypt.o
obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
obj-$(CONFIG_CRYPTO_DES) += des_generic.o
+++ /dev/null
-// 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/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;
-};
-
-struct aegis128_ops {
- int (*skcipher_walk_init)(struct skcipher_walk *walk,
- struct aead_request *req, bool atomic);
-
- void (*crypt_chunk)(struct aegis_state *state, u8 *dst,
- const u8 *src, unsigned int size);
-};
-
-static bool have_simd;
-
-bool crypto_aegis128_have_simd(void);
-void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
-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);
-
-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 (have_simd && crypto_simd_usable()) {
- 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 (have_simd && crypto_simd_usable()) {
- 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 void crypto_aegis128_process_crypt(struct aegis_state *state,
- struct aead_request *req,
- const struct aegis128_ops *ops)
-{
- struct skcipher_walk walk;
-
- ops->skcipher_walk_init(&walk, req, false);
-
- while (walk.nbytes) {
- unsigned int nbytes = walk.nbytes;
-
- if (nbytes < walk.total)
- nbytes = round_down(nbytes, walk.stride);
-
- ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes);
-
- skcipher_walk_done(&walk, walk.nbytes - nbytes);
- }
-}
-
-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) {
- crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
- 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 void crypto_aegis128_crypt(struct aead_request *req,
- union aegis_block *tag_xor,
- unsigned int cryptlen,
- const struct aegis128_ops *ops)
-{
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
- struct aegis_state state;
-
- crypto_aegis128_init(&state, &ctx->key, req->iv);
- crypto_aegis128_process_ad(&state, req->src, req->assoclen);
- crypto_aegis128_process_crypt(&state, req, ops);
- crypto_aegis128_final(&state, tag_xor, req->assoclen, cryptlen);
-}
-
-static int crypto_aegis128_encrypt(struct aead_request *req)
-{
- const struct aegis128_ops *ops = &(struct aegis128_ops){
- .skcipher_walk_init = skcipher_walk_aead_encrypt,
- .crypt_chunk = crypto_aegis128_encrypt_chunk,
- };
-
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
- union aegis_block tag = {};
- unsigned int authsize = crypto_aead_authsize(tfm);
- unsigned int cryptlen = req->cryptlen;
-
- if (have_simd && crypto_simd_usable())
- ops = &(struct aegis128_ops){
- .skcipher_walk_init = skcipher_walk_aead_encrypt,
- .crypt_chunk = crypto_aegis128_encrypt_chunk_simd };
-
- crypto_aegis128_crypt(req, &tag, cryptlen, ops);
-
- scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
- authsize, 1);
- return 0;
-}
-
-static int crypto_aegis128_decrypt(struct aead_request *req)
-{
- const struct aegis128_ops *ops = &(struct aegis128_ops){
- .skcipher_walk_init = skcipher_walk_aead_decrypt,
- .crypt_chunk = crypto_aegis128_decrypt_chunk,
- };
- 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;
-
- scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
- authsize, 0);
-
- if (have_simd && crypto_simd_usable())
- ops = &(struct aegis128_ops){
- .skcipher_walk_init = skcipher_walk_aead_decrypt,
- .crypt_chunk = crypto_aegis128_decrypt_chunk_simd };
-
- crypto_aegis128_crypt(req, &tag, cryptlen, ops);
-
- 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))
- have_simd = crypto_aegis128_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");
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
- */
-
-#ifdef CONFIG_ARM64
-#include <asm/neon-intrinsics.h>
-
-#define AES_ROUND "aese %0.16b, %1.16b \n\t aesmc %0.16b, %0.16b"
-#else
-#include <arm_neon.h>
-
-#define AES_ROUND "aese.8 %q0, %q1 \n\t aesmc.8 %q0, %q0"
-#endif
-
-#define AEGIS_BLOCK_SIZE 16
-
-#include <stddef.h>
-
-void *memcpy(void *dest, const void *src, size_t n);
-void *memset(void *s, int c, size_t n);
-
-struct aegis128_state {
- uint8x16_t v[5];
-};
-
-static struct aegis128_state aegis128_load_state_neon(const void *state)
-{
- return (struct aegis128_state){ {
- vld1q_u8(state),
- vld1q_u8(state + 16),
- vld1q_u8(state + 32),
- vld1q_u8(state + 48),
- vld1q_u8(state + 64)
- } };
-}
-
-static void aegis128_save_state_neon(struct aegis128_state st, void *state)
-{
- vst1q_u8(state, st.v[0]);
- vst1q_u8(state + 16, st.v[1]);
- vst1q_u8(state + 32, st.v[2]);
- vst1q_u8(state + 48, st.v[3]);
- vst1q_u8(state + 64, st.v[4]);
-}
-
-static uint8x16_t aegis_aes_round(uint8x16_t w)
-{
- uint8x16_t z = {};
-
- /*
- * We use inline asm here instead of the vaeseq_u8/vaesmcq_u8 intrinsics
- * to force the compiler to issue the aese/aesmc instructions in pairs.
- * This is much faster on many cores, where the instruction pair can
- * execute in a single cycle.
- */
- asm(AES_ROUND : "+w"(w) : "w"(z));
- return w;
-}
-
-static struct aegis128_state aegis128_update_neon(struct aegis128_state st,
- uint8x16_t m)
-{
- uint8x16_t t;
-
- t = aegis_aes_round(st.v[3]);
- st.v[3] ^= aegis_aes_round(st.v[2]);
- st.v[2] ^= aegis_aes_round(st.v[1]);
- st.v[1] ^= aegis_aes_round(st.v[0]);
- st.v[0] ^= aegis_aes_round(st.v[4]) ^ m;
- st.v[4] ^= t;
-
- return st;
-}
-
-void crypto_aegis128_update_neon(void *state, const void *msg)
-{
- struct aegis128_state st = aegis128_load_state_neon(state);
-
- st = aegis128_update_neon(st, vld1q_u8(msg));
-
- aegis128_save_state_neon(st, state);
-}
-
-void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
- unsigned int size)
-{
- struct aegis128_state st = aegis128_load_state_neon(state);
- uint8x16_t tmp;
-
- while (size >= AEGIS_BLOCK_SIZE) {
- uint8x16_t s = vld1q_u8(src);
-
- tmp = s ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
- st = aegis128_update_neon(st, s);
- vst1q_u8(dst, tmp);
-
- size -= AEGIS_BLOCK_SIZE;
- src += AEGIS_BLOCK_SIZE;
- dst += AEGIS_BLOCK_SIZE;
- }
-
- if (size > 0) {
- uint8_t buf[AEGIS_BLOCK_SIZE] = {};
- uint8x16_t msg;
-
- memcpy(buf, src, size);
- msg = vld1q_u8(buf);
- tmp = msg ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
- st = aegis128_update_neon(st, msg);
- vst1q_u8(buf, tmp);
- memcpy(dst, buf, size);
- }
-
- aegis128_save_state_neon(st, state);
-}
-
-void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
- unsigned int size)
-{
- struct aegis128_state st = aegis128_load_state_neon(state);
- uint8x16_t tmp;
-
- while (size >= AEGIS_BLOCK_SIZE) {
- tmp = vld1q_u8(src) ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
- st = aegis128_update_neon(st, tmp);
- vst1q_u8(dst, tmp);
-
- size -= AEGIS_BLOCK_SIZE;
- src += AEGIS_BLOCK_SIZE;
- dst += AEGIS_BLOCK_SIZE;
- }
-
- if (size > 0) {
- uint8_t buf[AEGIS_BLOCK_SIZE] = {};
- uint8x16_t msg;
-
- memcpy(buf, src, size);
- msg = vld1q_u8(buf) ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
- vst1q_u8(buf, msg);
- memcpy(dst, buf, size);
-
- memset(buf + size, 0, AEGIS_BLOCK_SIZE - size);
- msg = vld1q_u8(buf);
- st = aegis128_update_neon(st, msg);
- }
-
- aegis128_save_state_neon(st, state);
-}
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2019 Linaro Ltd <ard.biesheuvel@linaro.org>
- */
-
-#include <asm/cpufeature.h>
-#include <asm/neon.h>
-
-#include "aegis.h"
-
-void crypto_aegis128_update_neon(void *state, const void *msg);
-void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
- unsigned int size);
-void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
- unsigned int size);
-
-bool crypto_aegis128_have_simd(void)
-{
- return cpu_have_feature(cpu_feature(AES));
-}
-
-void crypto_aegis128_update_simd(union aegis_block *state, const void *msg)
-{
- kernel_neon_begin();
- crypto_aegis128_update_neon(state, msg);
- kernel_neon_end();
-}
-
-void crypto_aegis128_encrypt_chunk_simd(union aegis_block *state, u8 *dst,
- const u8 *src, unsigned int size)
-{
- kernel_neon_begin();
- crypto_aegis128_encrypt_chunk_neon(state, dst, src, size);
- kernel_neon_end();
-}
-
-void crypto_aegis128_decrypt_chunk_simd(union aegis_block *state, u8 *dst,
- const u8 *src, unsigned int size)
-{
- kernel_neon_begin();
- crypto_aegis128_decrypt_chunk_neon(state, dst, src, size);
- kernel_neon_end();
-}
--- /dev/null
+// 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/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/scatterlist.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;
+};
+
+struct aegis128_ops {
+ int (*skcipher_walk_init)(struct skcipher_walk *walk,
+ struct aead_request *req, bool atomic);
+
+ void (*crypt_chunk)(struct aegis_state *state, u8 *dst,
+ const u8 *src, unsigned int size);
+};
+
+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)
+{
+ 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)
+{
+ 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 void crypto_aegis128_process_crypt(struct aegis_state *state,
+ struct aead_request *req,
+ const struct aegis128_ops *ops)
+{
+ struct skcipher_walk walk;
+
+ ops->skcipher_walk_init(&walk, req, false);
+
+ while (walk.nbytes) {
+ unsigned int nbytes = walk.nbytes;
+
+ if (nbytes < walk.total)
+ nbytes = round_down(nbytes, walk.stride);
+
+ ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
+ nbytes);
+
+ skcipher_walk_done(&walk, walk.nbytes - nbytes);
+ }
+}
+
+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) {
+ crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ 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 void crypto_aegis128_crypt(struct aead_request *req,
+ union aegis_block *tag_xor,
+ unsigned int cryptlen,
+ const struct aegis128_ops *ops)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
+ struct aegis_state state;
+
+ crypto_aegis128_init(&state, &ctx->key, req->iv);
+ crypto_aegis128_process_ad(&state, req->src, req->assoclen);
+ crypto_aegis128_process_crypt(&state, req, ops);
+ crypto_aegis128_final(&state, tag_xor, req->assoclen, cryptlen);
+}
+
+static int crypto_aegis128_encrypt(struct aead_request *req)
+{
+ static const struct aegis128_ops ops = {
+ .skcipher_walk_init = skcipher_walk_aead_encrypt,
+ .crypt_chunk = crypto_aegis128_encrypt_chunk,
+ };
+
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ union aegis_block tag = {};
+ unsigned int authsize = crypto_aead_authsize(tfm);
+ unsigned int cryptlen = req->cryptlen;
+
+ crypto_aegis128_crypt(req, &tag, cryptlen, &ops);
+
+ 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 struct aegis128_ops ops = {
+ .skcipher_walk_init = skcipher_walk_aead_decrypt,
+ .crypt_chunk = crypto_aegis128_decrypt_chunk,
+ };
+ 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;
+
+ scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
+ authsize, 0);
+
+ crypto_aegis128_crypt(req, &tag, cryptlen, &ops);
+
+ 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)
+{
+ 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");
projects / platform / kernel / linux-rpi.git / commitdiff