1
2
3
4
5
6
7
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/crypto.h>
11#include <linux/err.h>
12#include <crypto/algapi.h>
13#include <crypto/internal/simd.h>
14#include <crypto/serpent.h>
15#include <crypto/xts.h>
16#include <asm/crypto/glue_helper.h>
17#include <asm/crypto/serpent-avx.h>
18
19#define SERPENT_AVX2_PARALLEL_BLOCKS 16
20
21
22asmlinkage void serpent_ecb_enc_16way(struct serpent_ctx *ctx, u8 *dst,
23 const u8 *src);
24asmlinkage void serpent_ecb_dec_16way(struct serpent_ctx *ctx, u8 *dst,
25 const u8 *src);
26asmlinkage void serpent_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src);
27
28asmlinkage void serpent_ctr_16way(void *ctx, u128 *dst, const u128 *src,
29 le128 *iv);
30asmlinkage void serpent_xts_enc_16way(struct serpent_ctx *ctx, u8 *dst,
31 const u8 *src, le128 *iv);
32asmlinkage void serpent_xts_dec_16way(struct serpent_ctx *ctx, u8 *dst,
33 const u8 *src, le128 *iv);
34
35static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
36 const u8 *key, unsigned int keylen)
37{
38 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
39}
40
41static const struct common_glue_ctx serpent_enc = {
42 .num_funcs = 3,
43 .fpu_blocks_limit = 8,
44
45 .funcs = { {
46 .num_blocks = 16,
47 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_16way) }
48 }, {
49 .num_blocks = 8,
50 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) }
51 }, {
52 .num_blocks = 1,
53 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
54 } }
55};
56
57static const struct common_glue_ctx serpent_ctr = {
58 .num_funcs = 3,
59 .fpu_blocks_limit = 8,
60
61 .funcs = { {
62 .num_blocks = 16,
63 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_16way) }
64 }, {
65 .num_blocks = 8,
66 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) }
67 }, {
68 .num_blocks = 1,
69 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(__serpent_crypt_ctr) }
70 } }
71};
72
73static const struct common_glue_ctx serpent_enc_xts = {
74 .num_funcs = 3,
75 .fpu_blocks_limit = 8,
76
77 .funcs = { {
78 .num_blocks = 16,
79 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_16way) }
80 }, {
81 .num_blocks = 8,
82 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) }
83 }, {
84 .num_blocks = 1,
85 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) }
86 } }
87};
88
89static const struct common_glue_ctx serpent_dec = {
90 .num_funcs = 3,
91 .fpu_blocks_limit = 8,
92
93 .funcs = { {
94 .num_blocks = 16,
95 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_16way) }
96 }, {
97 .num_blocks = 8,
98 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) }
99 }, {
100 .num_blocks = 1,
101 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
102 } }
103};
104
105static const struct common_glue_ctx serpent_dec_cbc = {
106 .num_funcs = 3,
107 .fpu_blocks_limit = 8,
108
109 .funcs = { {
110 .num_blocks = 16,
111 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_16way) }
112 }, {
113 .num_blocks = 8,
114 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) }
115 }, {
116 .num_blocks = 1,
117 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
118 } }
119};
120
121static const struct common_glue_ctx serpent_dec_xts = {
122 .num_funcs = 3,
123 .fpu_blocks_limit = 8,
124
125 .funcs = { {
126 .num_blocks = 16,
127 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_16way) }
128 }, {
129 .num_blocks = 8,
130 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) }
131 }, {
132 .num_blocks = 1,
133 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) }
134 } }
135};
136
137static int ecb_encrypt(struct skcipher_request *req)
138{
139 return glue_ecb_req_128bit(&serpent_enc, req);
140}
141
142static int ecb_decrypt(struct skcipher_request *req)
143{
144 return glue_ecb_req_128bit(&serpent_dec, req);
145}
146
147static int cbc_encrypt(struct skcipher_request *req)
148{
149 return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt),
150 req);
151}
152
153static int cbc_decrypt(struct skcipher_request *req)
154{
155 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
156}
157
158static int ctr_crypt(struct skcipher_request *req)
159{
160 return glue_ctr_req_128bit(&serpent_ctr, req);
161}
162
163static int xts_encrypt(struct skcipher_request *req)
164{
165 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
166 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
167
168 return glue_xts_req_128bit(&serpent_enc_xts, req,
169 XTS_TWEAK_CAST(__serpent_encrypt),
170 &ctx->tweak_ctx, &ctx->crypt_ctx, false);
171}
172
173static int xts_decrypt(struct skcipher_request *req)
174{
175 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
176 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
177
178 return glue_xts_req_128bit(&serpent_dec_xts, req,
179 XTS_TWEAK_CAST(__serpent_encrypt),
180 &ctx->tweak_ctx, &ctx->crypt_ctx, true);
181}
182
183static struct skcipher_alg serpent_algs[] = {
184 {
185 .base.cra_name = "__ecb(serpent)",
186 .base.cra_driver_name = "__ecb-serpent-avx2",
187 .base.cra_priority = 600,
188 .base.cra_flags = CRYPTO_ALG_INTERNAL,
189 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
190 .base.cra_ctxsize = sizeof(struct serpent_ctx),
191 .base.cra_module = THIS_MODULE,
192 .min_keysize = SERPENT_MIN_KEY_SIZE,
193 .max_keysize = SERPENT_MAX_KEY_SIZE,
194 .setkey = serpent_setkey_skcipher,
195 .encrypt = ecb_encrypt,
196 .decrypt = ecb_decrypt,
197 }, {
198 .base.cra_name = "__cbc(serpent)",
199 .base.cra_driver_name = "__cbc-serpent-avx2",
200 .base.cra_priority = 600,
201 .base.cra_flags = CRYPTO_ALG_INTERNAL,
202 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
203 .base.cra_ctxsize = sizeof(struct serpent_ctx),
204 .base.cra_module = THIS_MODULE,
205 .min_keysize = SERPENT_MIN_KEY_SIZE,
206 .max_keysize = SERPENT_MAX_KEY_SIZE,
207 .ivsize = SERPENT_BLOCK_SIZE,
208 .setkey = serpent_setkey_skcipher,
209 .encrypt = cbc_encrypt,
210 .decrypt = cbc_decrypt,
211 }, {
212 .base.cra_name = "__ctr(serpent)",
213 .base.cra_driver_name = "__ctr-serpent-avx2",
214 .base.cra_priority = 600,
215 .base.cra_flags = CRYPTO_ALG_INTERNAL,
216 .base.cra_blocksize = 1,
217 .base.cra_ctxsize = sizeof(struct serpent_ctx),
218 .base.cra_module = THIS_MODULE,
219 .min_keysize = SERPENT_MIN_KEY_SIZE,
220 .max_keysize = SERPENT_MAX_KEY_SIZE,
221 .ivsize = SERPENT_BLOCK_SIZE,
222 .chunksize = SERPENT_BLOCK_SIZE,
223 .setkey = serpent_setkey_skcipher,
224 .encrypt = ctr_crypt,
225 .decrypt = ctr_crypt,
226 }, {
227 .base.cra_name = "__xts(serpent)",
228 .base.cra_driver_name = "__xts-serpent-avx2",
229 .base.cra_priority = 600,
230 .base.cra_flags = CRYPTO_ALG_INTERNAL,
231 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
232 .base.cra_ctxsize = sizeof(struct serpent_xts_ctx),
233 .base.cra_module = THIS_MODULE,
234 .min_keysize = 2 * SERPENT_MIN_KEY_SIZE,
235 .max_keysize = 2 * SERPENT_MAX_KEY_SIZE,
236 .ivsize = SERPENT_BLOCK_SIZE,
237 .setkey = xts_serpent_setkey,
238 .encrypt = xts_encrypt,
239 .decrypt = xts_decrypt,
240 },
241};
242
243static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
244
245static int __init init(void)
246{
247 const char *feature_name;
248
249 if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
250 pr_info("AVX2 instructions are not detected.\n");
251 return -ENODEV;
252 }
253 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
254 &feature_name)) {
255 pr_info("CPU feature '%s' is not supported.\n", feature_name);
256 return -ENODEV;
257 }
258
259 return simd_register_skciphers_compat(serpent_algs,
260 ARRAY_SIZE(serpent_algs),
261 serpent_simd_algs);
262}
263
264static void __exit fini(void)
265{
266 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
267 serpent_simd_algs);
268}
269
270module_init(init);
271module_exit(fini);
272
273MODULE_LICENSE("GPL");
274MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
275MODULE_ALIAS_CRYPTO("serpent");
276MODULE_ALIAS_CRYPTO("serpent-asm");
277
