1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Glue Code for x86_64/AVX2 assembler optimized version of Serpent
5 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
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>
19 #define SERPENT_AVX2_PARALLEL_BLOCKS 16
21 /* 16-way AVX2 parallel cipher functions */
22 asmlinkage void serpent_ecb_enc_16way(struct serpent_ctx *ctx, u8 *dst,
24 asmlinkage void serpent_ecb_dec_16way(struct serpent_ctx *ctx, u8 *dst,
26 asmlinkage void serpent_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src);
28 asmlinkage void serpent_ctr_16way(void *ctx, u128 *dst, const u128 *src,
30 asmlinkage void serpent_xts_enc_16way(struct serpent_ctx *ctx, u8 *dst,
31 const u8 *src, le128 *iv);
32 asmlinkage void serpent_xts_dec_16way(struct serpent_ctx *ctx, u8 *dst,
33 const u8 *src, le128 *iv);
35 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
36 const u8 *key, unsigned int keylen)
38 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
41 static const struct common_glue_ctx serpent_enc = {
43 .fpu_blocks_limit = 8,
47 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_16way) }
50 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) }
53 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
57 static const struct common_glue_ctx serpent_ctr = {
59 .fpu_blocks_limit = 8,
63 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_16way) }
66 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) }
69 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(__serpent_crypt_ctr) }
73 static const struct common_glue_ctx serpent_enc_xts = {
75 .fpu_blocks_limit = 8,
79 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_16way) }
82 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) }
85 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) }
89 static const struct common_glue_ctx serpent_dec = {
91 .fpu_blocks_limit = 8,
95 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_16way) }
98 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) }
101 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
105 static const struct common_glue_ctx serpent_dec_cbc = {
107 .fpu_blocks_limit = 8,
111 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_16way) }
114 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) }
117 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
121 static const struct common_glue_ctx serpent_dec_xts = {
123 .fpu_blocks_limit = 8,
127 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_16way) }
130 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) }
133 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) }
137 static int ecb_encrypt(struct skcipher_request *req)
139 return glue_ecb_req_128bit(&serpent_enc, req);
142 static int ecb_decrypt(struct skcipher_request *req)
144 return glue_ecb_req_128bit(&serpent_dec, req);
147 static int cbc_encrypt(struct skcipher_request *req)
149 return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt),
153 static int cbc_decrypt(struct skcipher_request *req)
155 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
158 static int ctr_crypt(struct skcipher_request *req)
160 return glue_ctr_req_128bit(&serpent_ctr, req);
163 static int xts_encrypt(struct skcipher_request *req)
165 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
166 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
168 return glue_xts_req_128bit(&serpent_enc_xts, req,
169 XTS_TWEAK_CAST(__serpent_encrypt),
170 &ctx->tweak_ctx, &ctx->crypt_ctx);
173 static int xts_decrypt(struct skcipher_request *req)
175 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
176 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
178 return glue_xts_req_128bit(&serpent_dec_xts, req,
179 XTS_TWEAK_CAST(__serpent_encrypt),
180 &ctx->tweak_ctx, &ctx->crypt_ctx);
183 static struct skcipher_alg serpent_algs[] = {
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,
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,
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,
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,
243 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
245 static int __init init(void)
247 const char *feature_name;
249 if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
250 pr_info("AVX2 instructions are not detected.\n");
253 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
255 pr_info("CPU feature '%s' is not supported.\n", feature_name);
259 return simd_register_skciphers_compat(serpent_algs,
260 ARRAY_SIZE(serpent_algs),
264 static void __exit fini(void)
266 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
273 MODULE_LICENSE("GPL");
274 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
275 MODULE_ALIAS_CRYPTO("serpent");
276 MODULE_ALIAS_CRYPTO("serpent-asm");