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14#include <crypto/cryptd.h>
15#include <crypto/internal/aead.h>
16#include <crypto/internal/skcipher.h>
17#include <crypto/morus640_glue.h>
18#include <crypto/scatterwalk.h>
19#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/scatterlist.h>
24#include <asm/fpu/api.h>
25
26struct morus640_state {
27 struct morus640_block s[MORUS_STATE_BLOCKS];
28};
29
30struct morus640_ops {
31 int (*skcipher_walk_init)(struct skcipher_walk *walk,
32 struct aead_request *req, bool atomic);
33
34 void (*crypt_blocks)(void *state, const void *src, void *dst,
35 unsigned int length);
36 void (*crypt_tail)(void *state, const void *src, void *dst,
37 unsigned int length);
38};
39
40static void crypto_morus640_glue_process_ad(
41 struct morus640_state *state,
42 const struct morus640_glue_ops *ops,
43 struct scatterlist *sg_src, unsigned int assoclen)
44{
45 struct scatter_walk walk;
46 struct morus640_block buf;
47 unsigned int pos = 0;
48
49 scatterwalk_start(&walk, sg_src);
50 while (assoclen != 0) {
51 unsigned int size = scatterwalk_clamp(&walk, assoclen);
52 unsigned int left = size;
53 void *mapped = scatterwalk_map(&walk);
54 const u8 *src = (const u8 *)mapped;
55
56 if (pos + size >= MORUS640_BLOCK_SIZE) {
57 if (pos > 0) {
58 unsigned int fill = MORUS640_BLOCK_SIZE - pos;
59 memcpy(buf.bytes + pos, src, fill);
60 ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
61 pos = 0;
62 left -= fill;
63 src += fill;
64 }
65
66 ops->ad(state, src, left);
67 src += left & ~(MORUS640_BLOCK_SIZE - 1);
68 left &= MORUS640_BLOCK_SIZE - 1;
69 }
70
71 memcpy(buf.bytes + pos, src, left);
72
73 pos += left;
74 assoclen -= size;
75 scatterwalk_unmap(mapped);
76 scatterwalk_advance(&walk, size);
77 scatterwalk_done(&walk, 0, assoclen);
78 }
79
80 if (pos > 0) {
81 memset(buf.bytes + pos, 0, MORUS640_BLOCK_SIZE - pos);
82 ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
83 }
84}
85
86static void crypto_morus640_glue_process_crypt(struct morus640_state *state,
87 struct morus640_ops ops,
88 struct aead_request *req)
89{
90 struct skcipher_walk walk;
91 u8 *cursor_src, *cursor_dst;
92 unsigned int chunksize, base;
93
94 ops.skcipher_walk_init(&walk, req, false);
95
96 while (walk.nbytes) {
97 cursor_src = walk.src.virt.addr;
98 cursor_dst = walk.dst.virt.addr;
99 chunksize = walk.nbytes;
100
101 ops.crypt_blocks(state, cursor_src, cursor_dst, chunksize);
102
103 base = chunksize & ~(MORUS640_BLOCK_SIZE - 1);
104 cursor_src += base;
105 cursor_dst += base;
106 chunksize &= MORUS640_BLOCK_SIZE - 1;
107
108 if (chunksize > 0)
109 ops.crypt_tail(state, cursor_src, cursor_dst,
110 chunksize);
111
112 skcipher_walk_done(&walk, 0);
113 }
114}
115
116int crypto_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
117 unsigned int keylen)
118{
119 struct morus640_ctx *ctx = crypto_aead_ctx(aead);
120
121 if (keylen != MORUS640_BLOCK_SIZE) {
122 crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
123 return -EINVAL;
124 }
125
126 memcpy(ctx->key.bytes, key, MORUS640_BLOCK_SIZE);
127 return 0;
128}
129EXPORT_SYMBOL_GPL(crypto_morus640_glue_setkey);
130
131int crypto_morus640_glue_setauthsize(struct crypto_aead *tfm,
132 unsigned int authsize)
133{
134 return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
135}
136EXPORT_SYMBOL_GPL(crypto_morus640_glue_setauthsize);
137
138static void crypto_morus640_glue_crypt(struct aead_request *req,
139 struct morus640_ops ops,
140 unsigned int cryptlen,
141 struct morus640_block *tag_xor)
142{
143 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
144 struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
145 struct morus640_state state;
146
147 kernel_fpu_begin();
148
149 ctx->ops->init(&state, &ctx->key, req->iv);
150 crypto_morus640_glue_process_ad(&state, ctx->ops, req->src, req->assoclen);
151 crypto_morus640_glue_process_crypt(&state, ops, req);
152 ctx->ops->final(&state, tag_xor, req->assoclen, cryptlen);
153
154 kernel_fpu_end();
155}
156
157int crypto_morus640_glue_encrypt(struct aead_request *req)
158{
159 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
160 struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
161 struct morus640_ops OPS = {
162 .skcipher_walk_init = skcipher_walk_aead_encrypt,
163 .crypt_blocks = ctx->ops->enc,
164 .crypt_tail = ctx->ops->enc_tail,
165 };
166
167 struct morus640_block tag = {};
168 unsigned int authsize = crypto_aead_authsize(tfm);
169 unsigned int cryptlen = req->cryptlen;
170
171 crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
172
173 scatterwalk_map_and_copy(tag.bytes, req->dst,
174 req->assoclen + cryptlen, authsize, 1);
175 return 0;
176}
177EXPORT_SYMBOL_GPL(crypto_morus640_glue_encrypt);
178
179int crypto_morus640_glue_decrypt(struct aead_request *req)
180{
181 static const u8 zeros[MORUS640_BLOCK_SIZE] = {};
182
183 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
184 struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
185 struct morus640_ops OPS = {
186 .skcipher_walk_init = skcipher_walk_aead_decrypt,
187 .crypt_blocks = ctx->ops->dec,
188 .crypt_tail = ctx->ops->dec_tail,
189 };
190
191 struct morus640_block tag;
192 unsigned int authsize = crypto_aead_authsize(tfm);
193 unsigned int cryptlen = req->cryptlen - authsize;
194
195 scatterwalk_map_and_copy(tag.bytes, req->src,
196 req->assoclen + cryptlen, authsize, 0);
197
198 crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
199
200 return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
201}
202EXPORT_SYMBOL_GPL(crypto_morus640_glue_decrypt);
203
204void crypto_morus640_glue_init_ops(struct crypto_aead *aead,
205 const struct morus640_glue_ops *ops)
206{
207 struct morus640_ctx *ctx = crypto_aead_ctx(aead);
208 ctx->ops = ops;
209}
210EXPORT_SYMBOL_GPL(crypto_morus640_glue_init_ops);
211
212int cryptd_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
213 unsigned int keylen)
214{
215 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
216 struct cryptd_aead *cryptd_tfm = *ctx;
217
218 return crypto_aead_setkey(&cryptd_tfm->base, key, keylen);
219}
220EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setkey);
221
222int cryptd_morus640_glue_setauthsize(struct crypto_aead *aead,
223 unsigned int authsize)
224{
225 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
226 struct cryptd_aead *cryptd_tfm = *ctx;
227
228 return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);
229}
230EXPORT_SYMBOL_GPL(cryptd_morus640_glue_setauthsize);
231
232int cryptd_morus640_glue_encrypt(struct aead_request *req)
233{
234 struct crypto_aead *aead = crypto_aead_reqtfm(req);
235 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
236 struct cryptd_aead *cryptd_tfm = *ctx;
237
238 aead = &cryptd_tfm->base;
239 if (irq_fpu_usable() && (!in_atomic() ||
240 !cryptd_aead_queued(cryptd_tfm)))
241 aead = cryptd_aead_child(cryptd_tfm);
242
243 aead_request_set_tfm(req, aead);
244
245 return crypto_aead_encrypt(req);
246}
247EXPORT_SYMBOL_GPL(cryptd_morus640_glue_encrypt);
248
249int cryptd_morus640_glue_decrypt(struct aead_request *req)
250{
251 struct crypto_aead *aead = crypto_aead_reqtfm(req);
252 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
253 struct cryptd_aead *cryptd_tfm = *ctx;
254
255 aead = &cryptd_tfm->base;
256 if (irq_fpu_usable() && (!in_atomic() ||
257 !cryptd_aead_queued(cryptd_tfm)))
258 aead = cryptd_aead_child(cryptd_tfm);
259
260 aead_request_set_tfm(req, aead);
261
262 return crypto_aead_decrypt(req);
263}
264EXPORT_SYMBOL_GPL(cryptd_morus640_glue_decrypt);
265
266int cryptd_morus640_glue_init_tfm(struct crypto_aead *aead)
267{
268 struct cryptd_aead *cryptd_tfm;
269 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
270 const char *name = crypto_aead_alg(aead)->base.cra_driver_name;
271 char internal_name[CRYPTO_MAX_ALG_NAME];
272
273 if (snprintf(internal_name, CRYPTO_MAX_ALG_NAME, "__%s", name)
274 >= CRYPTO_MAX_ALG_NAME)
275 return -ENAMETOOLONG;
276
277 cryptd_tfm = cryptd_alloc_aead(internal_name, CRYPTO_ALG_INTERNAL,
278 CRYPTO_ALG_INTERNAL);
279 if (IS_ERR(cryptd_tfm))
280 return PTR_ERR(cryptd_tfm);
281
282 *ctx = cryptd_tfm;
283 crypto_aead_set_reqsize(aead, crypto_aead_reqsize(&cryptd_tfm->base));
284 return 0;
285}
286EXPORT_SYMBOL_GPL(cryptd_morus640_glue_init_tfm);
287
288void cryptd_morus640_glue_exit_tfm(struct crypto_aead *aead)
289{
290 struct cryptd_aead **ctx = crypto_aead_ctx(aead);
291
292 cryptd_free_aead(*ctx);
293}
294EXPORT_SYMBOL_GPL(cryptd_morus640_glue_exit_tfm);
295
296MODULE_LICENSE("GPL");
297MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
298MODULE_DESCRIPTION("MORUS-640 AEAD mode -- glue for x86 optimizations");
299
