2 * Glue Code for x86_64/AVX2 assembler optimized version of Serpent
4 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/crypto.h>
16 #include <linux/err.h>
17 #include <crypto/algapi.h>
18 #include <crypto/internal/simd.h>
19 #include <crypto/serpent.h>
20 #include <crypto/xts.h>
21 #include <asm/crypto/glue_helper.h>
22 #include <asm/crypto/serpent-avx.h>
24 #define SERPENT_AVX2_PARALLEL_BLOCKS 16
26 /* 16-way AVX2 parallel cipher functions */
27 asmlinkage void serpent_ecb_enc_16way(struct serpent_ctx *ctx, u8 *dst,
29 asmlinkage void serpent_ecb_dec_16way(struct serpent_ctx *ctx, u8 *dst,
31 asmlinkage void serpent_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src);
33 asmlinkage void serpent_ctr_16way(void *ctx, u128 *dst, const u128 *src,
35 asmlinkage void serpent_xts_enc_16way(struct serpent_ctx *ctx, u8 *dst,
36 const u8 *src, le128 *iv);
37 asmlinkage void serpent_xts_dec_16way(struct serpent_ctx *ctx, u8 *dst,
38 const u8 *src, le128 *iv);
40 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
41 const u8 *key, unsigned int keylen)
43 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
46 static const struct common_glue_ctx serpent_enc = {
48 .fpu_blocks_limit = 8,
52 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_16way) }
55 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) }
58 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
62 static const struct common_glue_ctx serpent_ctr = {
64 .fpu_blocks_limit = 8,
68 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_16way) }
71 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) }
74 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(__serpent_crypt_ctr) }
78 static const struct common_glue_ctx serpent_enc_xts = {
80 .fpu_blocks_limit = 8,
84 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_16way) }
87 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) }
90 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) }
94 static const struct common_glue_ctx serpent_dec = {
96 .fpu_blocks_limit = 8,
100 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_16way) }
103 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) }
106 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
110 static const struct common_glue_ctx serpent_dec_cbc = {
112 .fpu_blocks_limit = 8,
116 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_16way) }
119 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) }
122 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
126 static const struct common_glue_ctx serpent_dec_xts = {
128 .fpu_blocks_limit = 8,
132 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_16way) }
135 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) }
138 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) }
142 static int ecb_encrypt(struct skcipher_request *req)
144 return glue_ecb_req_128bit(&serpent_enc, req);
147 static int ecb_decrypt(struct skcipher_request *req)
149 return glue_ecb_req_128bit(&serpent_dec, req);
152 static int cbc_encrypt(struct skcipher_request *req)
154 return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt),
158 static int cbc_decrypt(struct skcipher_request *req)
160 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
163 static int ctr_crypt(struct skcipher_request *req)
165 return glue_ctr_req_128bit(&serpent_ctr, req);
168 static int xts_encrypt(struct skcipher_request *req)
170 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
171 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
173 return glue_xts_req_128bit(&serpent_enc_xts, req,
174 XTS_TWEAK_CAST(__serpent_encrypt),
175 &ctx->tweak_ctx, &ctx->crypt_ctx);
178 static int xts_decrypt(struct skcipher_request *req)
180 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
181 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
183 return glue_xts_req_128bit(&serpent_dec_xts, req,
184 XTS_TWEAK_CAST(__serpent_encrypt),
185 &ctx->tweak_ctx, &ctx->crypt_ctx);
188 static struct skcipher_alg serpent_algs[] = {
190 .base.cra_name = "__ecb(serpent)",
191 .base.cra_driver_name = "__ecb-serpent-avx2",
192 .base.cra_priority = 600,
193 .base.cra_flags = CRYPTO_ALG_INTERNAL,
194 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
195 .base.cra_ctxsize = sizeof(struct serpent_ctx),
196 .base.cra_module = THIS_MODULE,
197 .min_keysize = SERPENT_MIN_KEY_SIZE,
198 .max_keysize = SERPENT_MAX_KEY_SIZE,
199 .setkey = serpent_setkey_skcipher,
200 .encrypt = ecb_encrypt,
201 .decrypt = ecb_decrypt,
203 .base.cra_name = "__cbc(serpent)",
204 .base.cra_driver_name = "__cbc-serpent-avx2",
205 .base.cra_priority = 600,
206 .base.cra_flags = CRYPTO_ALG_INTERNAL,
207 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
208 .base.cra_ctxsize = sizeof(struct serpent_ctx),
209 .base.cra_module = THIS_MODULE,
210 .min_keysize = SERPENT_MIN_KEY_SIZE,
211 .max_keysize = SERPENT_MAX_KEY_SIZE,
212 .ivsize = SERPENT_BLOCK_SIZE,
213 .setkey = serpent_setkey_skcipher,
214 .encrypt = cbc_encrypt,
215 .decrypt = cbc_decrypt,
217 .base.cra_name = "__ctr(serpent)",
218 .base.cra_driver_name = "__ctr-serpent-avx2",
219 .base.cra_priority = 600,
220 .base.cra_flags = CRYPTO_ALG_INTERNAL,
221 .base.cra_blocksize = 1,
222 .base.cra_ctxsize = sizeof(struct serpent_ctx),
223 .base.cra_module = THIS_MODULE,
224 .min_keysize = SERPENT_MIN_KEY_SIZE,
225 .max_keysize = SERPENT_MAX_KEY_SIZE,
226 .ivsize = SERPENT_BLOCK_SIZE,
227 .chunksize = SERPENT_BLOCK_SIZE,
228 .setkey = serpent_setkey_skcipher,
229 .encrypt = ctr_crypt,
230 .decrypt = ctr_crypt,
232 .base.cra_name = "__xts(serpent)",
233 .base.cra_driver_name = "__xts-serpent-avx2",
234 .base.cra_priority = 600,
235 .base.cra_flags = CRYPTO_ALG_INTERNAL,
236 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
237 .base.cra_ctxsize = sizeof(struct serpent_xts_ctx),
238 .base.cra_module = THIS_MODULE,
239 .min_keysize = 2 * SERPENT_MIN_KEY_SIZE,
240 .max_keysize = 2 * SERPENT_MAX_KEY_SIZE,
241 .ivsize = SERPENT_BLOCK_SIZE,
242 .setkey = xts_serpent_setkey,
243 .encrypt = xts_encrypt,
244 .decrypt = xts_decrypt,
248 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
250 static int __init init(void)
252 const char *feature_name;
254 if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
255 pr_info("AVX2 instructions are not detected.\n");
258 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
260 pr_info("CPU feature '%s' is not supported.\n", feature_name);
264 return simd_register_skciphers_compat(serpent_algs,
265 ARRAY_SIZE(serpent_algs),
269 static void __exit fini(void)
271 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
278 MODULE_LICENSE("GPL");
279 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
280 MODULE_ALIAS_CRYPTO("serpent");
281 MODULE_ALIAS_CRYPTO("serpent-asm");