1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * The AEGIS-128L Authenticated-Encryption Algorithm
4 * Glue for AES-NI + SSE2 implementation
6 * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
7 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
10 #include <crypto/internal/aead.h>
11 #include <crypto/internal/simd.h>
12 #include <crypto/internal/skcipher.h>
13 #include <crypto/scatterwalk.h>
14 #include <linux/module.h>
15 #include <asm/fpu/api.h>
16 #include <asm/cpu_device_id.h>
18 #define AEGIS128L_BLOCK_ALIGN 16
19 #define AEGIS128L_BLOCK_SIZE 32
20 #define AEGIS128L_NONCE_SIZE 16
21 #define AEGIS128L_STATE_BLOCKS 8
22 #define AEGIS128L_KEY_SIZE 16
23 #define AEGIS128L_MIN_AUTH_SIZE 8
24 #define AEGIS128L_MAX_AUTH_SIZE 16
26 asmlinkage void crypto_aegis128l_aesni_init(void *state, void *key, void *iv);
28 asmlinkage void crypto_aegis128l_aesni_ad(
29 void *state, unsigned int length, const void *data);
31 asmlinkage void crypto_aegis128l_aesni_enc(
32 void *state, unsigned int length, const void *src, void *dst);
34 asmlinkage void crypto_aegis128l_aesni_dec(
35 void *state, unsigned int length, const void *src, void *dst);
37 asmlinkage void crypto_aegis128l_aesni_enc_tail(
38 void *state, unsigned int length, const void *src, void *dst);
40 asmlinkage void crypto_aegis128l_aesni_dec_tail(
41 void *state, unsigned int length, const void *src, void *dst);
43 asmlinkage void crypto_aegis128l_aesni_final(
44 void *state, void *tag_xor, unsigned int cryptlen,
45 unsigned int assoclen);
48 u8 bytes[AEGIS128L_BLOCK_SIZE] __aligned(AEGIS128L_BLOCK_ALIGN);
52 struct aegis_block blocks[AEGIS128L_STATE_BLOCKS];
56 struct aegis_block key;
59 struct aegis_crypt_ops {
60 int (*skcipher_walk_init)(struct skcipher_walk *walk,
61 struct aead_request *req, bool atomic);
63 void (*crypt_blocks)(void *state, unsigned int length, const void *src,
65 void (*crypt_tail)(void *state, unsigned int length, const void *src,
69 static void crypto_aegis128l_aesni_process_ad(
70 struct aegis_state *state, struct scatterlist *sg_src,
71 unsigned int assoclen)
73 struct scatter_walk walk;
74 struct aegis_block buf;
77 scatterwalk_start(&walk, sg_src);
78 while (assoclen != 0) {
79 unsigned int size = scatterwalk_clamp(&walk, assoclen);
80 unsigned int left = size;
81 void *mapped = scatterwalk_map(&walk);
82 const u8 *src = (const u8 *)mapped;
84 if (pos + size >= AEGIS128L_BLOCK_SIZE) {
86 unsigned int fill = AEGIS128L_BLOCK_SIZE - pos;
87 memcpy(buf.bytes + pos, src, fill);
88 crypto_aegis128l_aesni_ad(state,
96 crypto_aegis128l_aesni_ad(state, left, src);
98 src += left & ~(AEGIS128L_BLOCK_SIZE - 1);
99 left &= AEGIS128L_BLOCK_SIZE - 1;
102 memcpy(buf.bytes + pos, src, left);
106 scatterwalk_unmap(mapped);
107 scatterwalk_advance(&walk, size);
108 scatterwalk_done(&walk, 0, assoclen);
112 memset(buf.bytes + pos, 0, AEGIS128L_BLOCK_SIZE - pos);
113 crypto_aegis128l_aesni_ad(state, AEGIS128L_BLOCK_SIZE, buf.bytes);
117 static void crypto_aegis128l_aesni_process_crypt(
118 struct aegis_state *state, struct skcipher_walk *walk,
119 const struct aegis_crypt_ops *ops)
121 while (walk->nbytes >= AEGIS128L_BLOCK_SIZE) {
122 ops->crypt_blocks(state, round_down(walk->nbytes,
123 AEGIS128L_BLOCK_SIZE),
124 walk->src.virt.addr, walk->dst.virt.addr);
125 skcipher_walk_done(walk, walk->nbytes % AEGIS128L_BLOCK_SIZE);
129 ops->crypt_tail(state, walk->nbytes, walk->src.virt.addr,
130 walk->dst.virt.addr);
131 skcipher_walk_done(walk, 0);
135 static struct aegis_ctx *crypto_aegis128l_aesni_ctx(struct crypto_aead *aead)
137 u8 *ctx = crypto_aead_ctx(aead);
138 ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx));
142 static int crypto_aegis128l_aesni_setkey(struct crypto_aead *aead,
143 const u8 *key, unsigned int keylen)
145 struct aegis_ctx *ctx = crypto_aegis128l_aesni_ctx(aead);
147 if (keylen != AEGIS128L_KEY_SIZE) {
148 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
152 memcpy(ctx->key.bytes, key, AEGIS128L_KEY_SIZE);
157 static int crypto_aegis128l_aesni_setauthsize(struct crypto_aead *tfm,
158 unsigned int authsize)
160 if (authsize > AEGIS128L_MAX_AUTH_SIZE)
162 if (authsize < AEGIS128L_MIN_AUTH_SIZE)
167 static void crypto_aegis128l_aesni_crypt(struct aead_request *req,
168 struct aegis_block *tag_xor,
169 unsigned int cryptlen,
170 const struct aegis_crypt_ops *ops)
172 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
173 struct aegis_ctx *ctx = crypto_aegis128l_aesni_ctx(tfm);
174 struct skcipher_walk walk;
175 struct aegis_state state;
177 ops->skcipher_walk_init(&walk, req, true);
181 crypto_aegis128l_aesni_init(&state, ctx->key.bytes, req->iv);
182 crypto_aegis128l_aesni_process_ad(&state, req->src, req->assoclen);
183 crypto_aegis128l_aesni_process_crypt(&state, &walk, ops);
184 crypto_aegis128l_aesni_final(&state, tag_xor, req->assoclen, cryptlen);
189 static int crypto_aegis128l_aesni_encrypt(struct aead_request *req)
191 static const struct aegis_crypt_ops OPS = {
192 .skcipher_walk_init = skcipher_walk_aead_encrypt,
193 .crypt_blocks = crypto_aegis128l_aesni_enc,
194 .crypt_tail = crypto_aegis128l_aesni_enc_tail,
197 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
198 struct aegis_block tag = {};
199 unsigned int authsize = crypto_aead_authsize(tfm);
200 unsigned int cryptlen = req->cryptlen;
202 crypto_aegis128l_aesni_crypt(req, &tag, cryptlen, &OPS);
204 scatterwalk_map_and_copy(tag.bytes, req->dst,
205 req->assoclen + cryptlen, authsize, 1);
209 static int crypto_aegis128l_aesni_decrypt(struct aead_request *req)
211 static const struct aegis_block zeros = {};
213 static const struct aegis_crypt_ops OPS = {
214 .skcipher_walk_init = skcipher_walk_aead_decrypt,
215 .crypt_blocks = crypto_aegis128l_aesni_dec,
216 .crypt_tail = crypto_aegis128l_aesni_dec_tail,
219 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
220 struct aegis_block tag;
221 unsigned int authsize = crypto_aead_authsize(tfm);
222 unsigned int cryptlen = req->cryptlen - authsize;
224 scatterwalk_map_and_copy(tag.bytes, req->src,
225 req->assoclen + cryptlen, authsize, 0);
227 crypto_aegis128l_aesni_crypt(req, &tag, cryptlen, &OPS);
229 return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0;
232 static int crypto_aegis128l_aesni_init_tfm(struct crypto_aead *aead)
237 static void crypto_aegis128l_aesni_exit_tfm(struct crypto_aead *aead)
241 static struct aead_alg crypto_aegis128l_aesni_alg = {
242 .setkey = crypto_aegis128l_aesni_setkey,
243 .setauthsize = crypto_aegis128l_aesni_setauthsize,
244 .encrypt = crypto_aegis128l_aesni_encrypt,
245 .decrypt = crypto_aegis128l_aesni_decrypt,
246 .init = crypto_aegis128l_aesni_init_tfm,
247 .exit = crypto_aegis128l_aesni_exit_tfm,
249 .ivsize = AEGIS128L_NONCE_SIZE,
250 .maxauthsize = AEGIS128L_MAX_AUTH_SIZE,
251 .chunksize = AEGIS128L_BLOCK_SIZE,
254 .cra_flags = CRYPTO_ALG_INTERNAL,
256 .cra_ctxsize = sizeof(struct aegis_ctx) +
257 __alignof__(struct aegis_ctx),
261 .cra_name = "__aegis128l",
262 .cra_driver_name = "__aegis128l-aesni",
264 .cra_module = THIS_MODULE,
268 static struct simd_aead_alg *simd_alg;
270 static int __init crypto_aegis128l_aesni_module_init(void)
272 if (!boot_cpu_has(X86_FEATURE_XMM2) ||
273 !boot_cpu_has(X86_FEATURE_AES) ||
274 !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL))
277 return simd_register_aeads_compat(&crypto_aegis128l_aesni_alg, 1,
281 static void __exit crypto_aegis128l_aesni_module_exit(void)
283 simd_unregister_aeads(&crypto_aegis128l_aesni_alg, 1, &simd_alg);
286 module_init(crypto_aegis128l_aesni_module_init);
287 module_exit(crypto_aegis128l_aesni_module_exit);
289 MODULE_LICENSE("GPL");
290 MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
291 MODULE_DESCRIPTION("AEGIS-128L AEAD algorithm -- AESNI+SSE2 implementation");
292 MODULE_ALIAS_CRYPTO("aegis128l");
293 MODULE_ALIAS_CRYPTO("aegis128l-aesni");