1 /*
2 * Glue Code for SSE2 assembler versions of Serpent Cipher
3 *
4 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
5 *
6 * Glue code based on aesni-intel_glue.c by:
7 * Copyright (C) 2008, Intel Corp.
8 * Author: Huang Ying <ying.huang@intel.com>
9 *
10 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
11 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
12 * CTR part based on code (crypto/ctr.c) by:
13 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
28 * USA
29 *
30 */
31
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/crypto.h>
35 #include <linux/err.h>
36 #include <crypto/algapi.h>
37 #include <crypto/b128ops.h>
38 #include <crypto/internal/simd.h>
39 #include <crypto/serpent.h>
40 #include <asm/crypto/serpent-sse2.h>
41 #include <asm/crypto/glue_helper.h>
42
serpent_setkey_skcipher(struct crypto_skcipher * tfm,const u8 * key,unsigned int keylen)43 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
44 const u8 *key, unsigned int keylen)
45 {
46 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
47 }
48
serpent_decrypt_cbc_xway(void * ctx,u128 * dst,const u128 * src)49 static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
50 {
51 u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
52 unsigned int j;
53
54 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
55 ivs[j] = src[j];
56
57 serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
58
59 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
60 u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
61 }
62
serpent_crypt_ctr(void * ctx,u128 * dst,const u128 * src,le128 * iv)63 static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
64 {
65 be128 ctrblk;
66
67 le128_to_be128(&ctrblk, iv);
68 le128_inc(iv);
69
70 __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
71 u128_xor(dst, src, (u128 *)&ctrblk);
72 }
73
serpent_crypt_ctr_xway(void * ctx,u128 * dst,const u128 * src,le128 * iv)74 static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
75 le128 *iv)
76 {
77 be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
78 unsigned int i;
79
80 for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
81 if (dst != src)
82 dst[i] = src[i];
83
84 le128_to_be128(&ctrblks[i], iv);
85 le128_inc(iv);
86 }
87
88 serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
89 }
90
91 static const struct common_glue_ctx serpent_enc = {
92 .num_funcs = 2,
93 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
94
95 .funcs = { {
96 .num_blocks = SERPENT_PARALLEL_BLOCKS,
97 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
98 }, {
99 .num_blocks = 1,
100 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
101 } }
102 };
103
104 static const struct common_glue_ctx serpent_ctr = {
105 .num_funcs = 2,
106 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
107
108 .funcs = { {
109 .num_blocks = SERPENT_PARALLEL_BLOCKS,
110 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
111 }, {
112 .num_blocks = 1,
113 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
114 } }
115 };
116
117 static const struct common_glue_ctx serpent_dec = {
118 .num_funcs = 2,
119 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
120
121 .funcs = { {
122 .num_blocks = SERPENT_PARALLEL_BLOCKS,
123 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
124 }, {
125 .num_blocks = 1,
126 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
127 } }
128 };
129
130 static const struct common_glue_ctx serpent_dec_cbc = {
131 .num_funcs = 2,
132 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
133
134 .funcs = { {
135 .num_blocks = SERPENT_PARALLEL_BLOCKS,
136 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
137 }, {
138 .num_blocks = 1,
139 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
140 } }
141 };
142
ecb_encrypt(struct skcipher_request * req)143 static int ecb_encrypt(struct skcipher_request *req)
144 {
145 return glue_ecb_req_128bit(&serpent_enc, req);
146 }
147
ecb_decrypt(struct skcipher_request * req)148 static int ecb_decrypt(struct skcipher_request *req)
149 {
150 return glue_ecb_req_128bit(&serpent_dec, req);
151 }
152
cbc_encrypt(struct skcipher_request * req)153 static int cbc_encrypt(struct skcipher_request *req)
154 {
155 return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt),
156 req);
157 }
158
cbc_decrypt(struct skcipher_request * req)159 static int cbc_decrypt(struct skcipher_request *req)
160 {
161 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
162 }
163
ctr_crypt(struct skcipher_request * req)164 static int ctr_crypt(struct skcipher_request *req)
165 {
166 return glue_ctr_req_128bit(&serpent_ctr, req);
167 }
168
169 static struct skcipher_alg serpent_algs[] = {
170 {
171 .base.cra_name = "__ecb(serpent)",
172 .base.cra_driver_name = "__ecb-serpent-sse2",
173 .base.cra_priority = 400,
174 .base.cra_flags = CRYPTO_ALG_INTERNAL,
175 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
176 .base.cra_ctxsize = sizeof(struct serpent_ctx),
177 .base.cra_module = THIS_MODULE,
178 .min_keysize = SERPENT_MIN_KEY_SIZE,
179 .max_keysize = SERPENT_MAX_KEY_SIZE,
180 .setkey = serpent_setkey_skcipher,
181 .encrypt = ecb_encrypt,
182 .decrypt = ecb_decrypt,
183 }, {
184 .base.cra_name = "__cbc(serpent)",
185 .base.cra_driver_name = "__cbc-serpent-sse2",
186 .base.cra_priority = 400,
187 .base.cra_flags = CRYPTO_ALG_INTERNAL,
188 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
189 .base.cra_ctxsize = sizeof(struct serpent_ctx),
190 .base.cra_module = THIS_MODULE,
191 .min_keysize = SERPENT_MIN_KEY_SIZE,
192 .max_keysize = SERPENT_MAX_KEY_SIZE,
193 .ivsize = SERPENT_BLOCK_SIZE,
194 .setkey = serpent_setkey_skcipher,
195 .encrypt = cbc_encrypt,
196 .decrypt = cbc_decrypt,
197 }, {
198 .base.cra_name = "__ctr(serpent)",
199 .base.cra_driver_name = "__ctr-serpent-sse2",
200 .base.cra_priority = 400,
201 .base.cra_flags = CRYPTO_ALG_INTERNAL,
202 .base.cra_blocksize = 1,
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 .chunksize = SERPENT_BLOCK_SIZE,
209 .setkey = serpent_setkey_skcipher,
210 .encrypt = ctr_crypt,
211 .decrypt = ctr_crypt,
212 },
213 };
214
215 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
216
serpent_sse2_init(void)217 static int __init serpent_sse2_init(void)
218 {
219 if (!boot_cpu_has(X86_FEATURE_XMM2)) {
220 printk(KERN_INFO "SSE2 instructions are not detected.\n");
221 return -ENODEV;
222 }
223
224 return simd_register_skciphers_compat(serpent_algs,
225 ARRAY_SIZE(serpent_algs),
226 serpent_simd_algs);
227 }
228
serpent_sse2_exit(void)229 static void __exit serpent_sse2_exit(void)
230 {
231 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
232 serpent_simd_algs);
233 }
234
235 module_init(serpent_sse2_init);
236 module_exit(serpent_sse2_exit);
237
238 MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
239 MODULE_LICENSE("GPL");
240 MODULE_ALIAS_CRYPTO("serpent");
241
