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291 lines
7.9 KiB
291 lines
7.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* The AEGIS-128 Authenticated-Encryption Algorithm |
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* Glue for AES-NI + SSE2 implementation |
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* |
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* Copyright (c) 2017-2018 Ondrej Mosnacek <[email protected]> |
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* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved. |
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*/ |
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#include <crypto/internal/aead.h> |
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#include <crypto/internal/simd.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/module.h> |
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#include <asm/fpu/api.h> |
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#include <asm/cpu_device_id.h> |
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#define AEGIS128_BLOCK_ALIGN 16 |
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#define AEGIS128_BLOCK_SIZE 16 |
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#define AEGIS128_NONCE_SIZE 16 |
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#define AEGIS128_STATE_BLOCKS 5 |
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#define AEGIS128_KEY_SIZE 16 |
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#define AEGIS128_MIN_AUTH_SIZE 8 |
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#define AEGIS128_MAX_AUTH_SIZE 16 |
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asmlinkage void crypto_aegis128_aesni_init(void *state, void *key, void *iv); |
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asmlinkage void crypto_aegis128_aesni_ad( |
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void *state, unsigned int length, const void *data); |
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asmlinkage void crypto_aegis128_aesni_enc( |
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void *state, unsigned int length, const void *src, void *dst); |
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asmlinkage void crypto_aegis128_aesni_dec( |
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void *state, unsigned int length, const void *src, void *dst); |
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asmlinkage void crypto_aegis128_aesni_enc_tail( |
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void *state, unsigned int length, const void *src, void *dst); |
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asmlinkage void crypto_aegis128_aesni_dec_tail( |
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void *state, unsigned int length, const void *src, void *dst); |
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asmlinkage void crypto_aegis128_aesni_final( |
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void *state, void *tag_xor, unsigned int cryptlen, |
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unsigned int assoclen); |
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struct aegis_block { |
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u8 bytes[AEGIS128_BLOCK_SIZE] __aligned(AEGIS128_BLOCK_ALIGN); |
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}; |
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struct aegis_state { |
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struct aegis_block blocks[AEGIS128_STATE_BLOCKS]; |
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}; |
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struct aegis_ctx { |
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struct aegis_block key; |
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}; |
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struct aegis_crypt_ops { |
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int (*skcipher_walk_init)(struct skcipher_walk *walk, |
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struct aead_request *req, bool atomic); |
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void (*crypt_blocks)(void *state, unsigned int length, const void *src, |
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void *dst); |
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void (*crypt_tail)(void *state, unsigned int length, const void *src, |
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void *dst); |
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}; |
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static void crypto_aegis128_aesni_process_ad( |
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struct aegis_state *state, struct scatterlist *sg_src, |
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unsigned int assoclen) |
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{ |
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struct scatter_walk walk; |
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struct aegis_block buf; |
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unsigned int pos = 0; |
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scatterwalk_start(&walk, sg_src); |
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while (assoclen != 0) { |
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unsigned int size = scatterwalk_clamp(&walk, assoclen); |
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unsigned int left = size; |
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void *mapped = scatterwalk_map(&walk); |
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const u8 *src = (const u8 *)mapped; |
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if (pos + size >= AEGIS128_BLOCK_SIZE) { |
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if (pos > 0) { |
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unsigned int fill = AEGIS128_BLOCK_SIZE - pos; |
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memcpy(buf.bytes + pos, src, fill); |
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crypto_aegis128_aesni_ad(state, |
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AEGIS128_BLOCK_SIZE, |
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buf.bytes); |
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pos = 0; |
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left -= fill; |
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src += fill; |
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} |
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crypto_aegis128_aesni_ad(state, left, src); |
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src += left & ~(AEGIS128_BLOCK_SIZE - 1); |
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left &= AEGIS128_BLOCK_SIZE - 1; |
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} |
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memcpy(buf.bytes + pos, src, left); |
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pos += left; |
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assoclen -= size; |
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scatterwalk_unmap(mapped); |
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scatterwalk_advance(&walk, size); |
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scatterwalk_done(&walk, 0, assoclen); |
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} |
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if (pos > 0) { |
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memset(buf.bytes + pos, 0, AEGIS128_BLOCK_SIZE - pos); |
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crypto_aegis128_aesni_ad(state, AEGIS128_BLOCK_SIZE, buf.bytes); |
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} |
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} |
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static void crypto_aegis128_aesni_process_crypt( |
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struct aegis_state *state, struct skcipher_walk *walk, |
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const struct aegis_crypt_ops *ops) |
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{ |
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while (walk->nbytes >= AEGIS128_BLOCK_SIZE) { |
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ops->crypt_blocks(state, |
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round_down(walk->nbytes, AEGIS128_BLOCK_SIZE), |
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walk->src.virt.addr, walk->dst.virt.addr); |
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skcipher_walk_done(walk, walk->nbytes % AEGIS128_BLOCK_SIZE); |
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} |
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if (walk->nbytes) { |
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ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr, |
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walk->dst.virt.addr); |
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skcipher_walk_done(walk, 0); |
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} |
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} |
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static struct aegis_ctx *crypto_aegis128_aesni_ctx(struct crypto_aead *aead) |
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{ |
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u8 *ctx = crypto_aead_ctx(aead); |
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ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx)); |
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return (void *)ctx; |
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} |
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static int crypto_aegis128_aesni_setkey(struct crypto_aead *aead, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(aead); |
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if (keylen != AEGIS128_KEY_SIZE) |
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return -EINVAL; |
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memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE); |
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return 0; |
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} |
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static int crypto_aegis128_aesni_setauthsize(struct crypto_aead *tfm, |
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unsigned int authsize) |
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{ |
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if (authsize > AEGIS128_MAX_AUTH_SIZE) |
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return -EINVAL; |
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if (authsize < AEGIS128_MIN_AUTH_SIZE) |
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return -EINVAL; |
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return 0; |
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} |
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static void crypto_aegis128_aesni_crypt(struct aead_request *req, |
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struct aegis_block *tag_xor, |
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unsigned int cryptlen, |
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const struct aegis_crypt_ops *ops) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(tfm); |
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struct skcipher_walk walk; |
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struct aegis_state state; |
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ops->skcipher_walk_init(&walk, req, true); |
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kernel_fpu_begin(); |
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crypto_aegis128_aesni_init(&state, ctx->key.bytes, req->iv); |
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crypto_aegis128_aesni_process_ad(&state, req->src, req->assoclen); |
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crypto_aegis128_aesni_process_crypt(&state, &walk, ops); |
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crypto_aegis128_aesni_final(&state, tag_xor, req->assoclen, cryptlen); |
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kernel_fpu_end(); |
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} |
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static int crypto_aegis128_aesni_encrypt(struct aead_request *req) |
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{ |
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static const struct aegis_crypt_ops OPS = { |
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.skcipher_walk_init = skcipher_walk_aead_encrypt, |
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.crypt_blocks = crypto_aegis128_aesni_enc, |
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.crypt_tail = crypto_aegis128_aesni_enc_tail, |
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}; |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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struct aegis_block tag = {}; |
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unsigned int authsize = crypto_aead_authsize(tfm); |
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unsigned int cryptlen = req->cryptlen; |
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crypto_aegis128_aesni_crypt(req, &tag, cryptlen, &OPS); |
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scatterwalk_map_and_copy(tag.bytes, req->dst, |
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req->assoclen + cryptlen, authsize, 1); |
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return 0; |
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} |
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static int crypto_aegis128_aesni_decrypt(struct aead_request *req) |
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{ |
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static const struct aegis_block zeros = {}; |
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static const struct aegis_crypt_ops OPS = { |
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.skcipher_walk_init = skcipher_walk_aead_decrypt, |
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.crypt_blocks = crypto_aegis128_aesni_dec, |
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.crypt_tail = crypto_aegis128_aesni_dec_tail, |
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}; |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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struct aegis_block tag; |
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unsigned int authsize = crypto_aead_authsize(tfm); |
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unsigned int cryptlen = req->cryptlen - authsize; |
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scatterwalk_map_and_copy(tag.bytes, req->src, |
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req->assoclen + cryptlen, authsize, 0); |
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crypto_aegis128_aesni_crypt(req, &tag, cryptlen, &OPS); |
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return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0; |
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} |
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static int crypto_aegis128_aesni_init_tfm(struct crypto_aead *aead) |
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{ |
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return 0; |
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} |
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static void crypto_aegis128_aesni_exit_tfm(struct crypto_aead *aead) |
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{ |
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} |
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static struct aead_alg crypto_aegis128_aesni_alg = { |
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.setkey = crypto_aegis128_aesni_setkey, |
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.setauthsize = crypto_aegis128_aesni_setauthsize, |
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.encrypt = crypto_aegis128_aesni_encrypt, |
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.decrypt = crypto_aegis128_aesni_decrypt, |
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.init = crypto_aegis128_aesni_init_tfm, |
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.exit = crypto_aegis128_aesni_exit_tfm, |
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.ivsize = AEGIS128_NONCE_SIZE, |
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.maxauthsize = AEGIS128_MAX_AUTH_SIZE, |
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.chunksize = AEGIS128_BLOCK_SIZE, |
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.base = { |
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.cra_flags = CRYPTO_ALG_INTERNAL, |
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.cra_blocksize = 1, |
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.cra_ctxsize = sizeof(struct aegis_ctx) + |
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__alignof__(struct aegis_ctx), |
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.cra_alignmask = 0, |
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.cra_priority = 400, |
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.cra_name = "__aegis128", |
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.cra_driver_name = "__aegis128-aesni", |
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.cra_module = THIS_MODULE, |
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} |
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}; |
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static struct simd_aead_alg *simd_alg; |
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static int __init crypto_aegis128_aesni_module_init(void) |
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{ |
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if (!boot_cpu_has(X86_FEATURE_XMM2) || |
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!boot_cpu_has(X86_FEATURE_AES) || |
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!cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL)) |
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return -ENODEV; |
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return simd_register_aeads_compat(&crypto_aegis128_aesni_alg, 1, |
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&simd_alg); |
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} |
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static void __exit crypto_aegis128_aesni_module_exit(void) |
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{ |
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simd_unregister_aeads(&crypto_aegis128_aesni_alg, 1, &simd_alg); |
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} |
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module_init(crypto_aegis128_aesni_module_init); |
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module_exit(crypto_aegis128_aesni_module_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Ondrej Mosnacek <[email protected]>"); |
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MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm -- AESNI+SSE2 implementation"); |
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MODULE_ALIAS_CRYPTO("aegis128"); |
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MODULE_ALIAS_CRYPTO("aegis128-aesni");
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