1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Glue Code for SSE2 assembler versions of Serpent Cipher
4 *
5 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
6 *
7 * Glue code based on aesni-intel_glue.c by:
8 * Copyright (C) 2008, Intel Corp.
9 * Author: Huang Ying <ying.huang@intel.com>
10 *
11 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
12 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
13 * CTR part based on code (crypto/ctr.c) by:
14 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
15 */
16
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/crypto.h>
20 #include <linux/err.h>
21 #include <crypto/algapi.h>
22 #include <crypto/b128ops.h>
23 #include <crypto/internal/simd.h>
24 #include <crypto/serpent.h>
25 #include <asm/crypto/serpent-sse2.h>
26 #include <asm/crypto/glue_helper.h>
27
serpent_setkey_skcipher(struct crypto_skcipher * tfm,const u8 * key,unsigned int keylen)28 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
29 const u8 *key, unsigned int keylen)
30 {
31 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
32 }
33
serpent_decrypt_cbc_xway(const void * ctx,u8 * d,const u8 * s)34 static void serpent_decrypt_cbc_xway(const void *ctx, u8 *d, const u8 *s)
35 {
36 u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
37 u128 *dst = (u128 *)d;
38 const u128 *src = (const u128 *)s;
39 unsigned int j;
40
41 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
42 ivs[j] = src[j];
43
44 serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
45
46 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
47 u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
48 }
49
serpent_crypt_ctr(const void * ctx,u8 * d,const u8 * s,le128 * iv)50 static void serpent_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv)
51 {
52 be128 ctrblk;
53 u128 *dst = (u128 *)d;
54 const u128 *src = (const u128 *)s;
55
56 le128_to_be128(&ctrblk, iv);
57 le128_inc(iv);
58
59 __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
60 u128_xor(dst, src, (u128 *)&ctrblk);
61 }
62
serpent_crypt_ctr_xway(const void * ctx,u8 * d,const u8 * s,le128 * iv)63 static void serpent_crypt_ctr_xway(const void *ctx, u8 *d, const u8 *s,
64 le128 *iv)
65 {
66 be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
67 u128 *dst = (u128 *)d;
68 const u128 *src = (const u128 *)s;
69 unsigned int i;
70
71 for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
72 if (dst != src)
73 dst[i] = src[i];
74
75 le128_to_be128(&ctrblks[i], iv);
76 le128_inc(iv);
77 }
78
79 serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
80 }
81
82 static const struct common_glue_ctx serpent_enc = {
83 .num_funcs = 2,
84 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
85
86 .funcs = { {
87 .num_blocks = SERPENT_PARALLEL_BLOCKS,
88 .fn_u = { .ecb = serpent_enc_blk_xway }
89 }, {
90 .num_blocks = 1,
91 .fn_u = { .ecb = __serpent_encrypt }
92 } }
93 };
94
95 static const struct common_glue_ctx serpent_ctr = {
96 .num_funcs = 2,
97 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
98
99 .funcs = { {
100 .num_blocks = SERPENT_PARALLEL_BLOCKS,
101 .fn_u = { .ctr = serpent_crypt_ctr_xway }
102 }, {
103 .num_blocks = 1,
104 .fn_u = { .ctr = serpent_crypt_ctr }
105 } }
106 };
107
108 static const struct common_glue_ctx serpent_dec = {
109 .num_funcs = 2,
110 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
111
112 .funcs = { {
113 .num_blocks = SERPENT_PARALLEL_BLOCKS,
114 .fn_u = { .ecb = serpent_dec_blk_xway }
115 }, {
116 .num_blocks = 1,
117 .fn_u = { .ecb = __serpent_decrypt }
118 } }
119 };
120
121 static const struct common_glue_ctx serpent_dec_cbc = {
122 .num_funcs = 2,
123 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
124
125 .funcs = { {
126 .num_blocks = SERPENT_PARALLEL_BLOCKS,
127 .fn_u = { .cbc = serpent_decrypt_cbc_xway }
128 }, {
129 .num_blocks = 1,
130 .fn_u = { .cbc = __serpent_decrypt }
131 } }
132 };
133
ecb_encrypt(struct skcipher_request * req)134 static int ecb_encrypt(struct skcipher_request *req)
135 {
136 return glue_ecb_req_128bit(&serpent_enc, req);
137 }
138
ecb_decrypt(struct skcipher_request * req)139 static int ecb_decrypt(struct skcipher_request *req)
140 {
141 return glue_ecb_req_128bit(&serpent_dec, req);
142 }
143
cbc_encrypt(struct skcipher_request * req)144 static int cbc_encrypt(struct skcipher_request *req)
145 {
146 return glue_cbc_encrypt_req_128bit(__serpent_encrypt,
147 req);
148 }
149
cbc_decrypt(struct skcipher_request * req)150 static int cbc_decrypt(struct skcipher_request *req)
151 {
152 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
153 }
154
ctr_crypt(struct skcipher_request * req)155 static int ctr_crypt(struct skcipher_request *req)
156 {
157 return glue_ctr_req_128bit(&serpent_ctr, req);
158 }
159
160 static struct skcipher_alg serpent_algs[] = {
161 {
162 .base.cra_name = "__ecb(serpent)",
163 .base.cra_driver_name = "__ecb-serpent-sse2",
164 .base.cra_priority = 400,
165 .base.cra_flags = CRYPTO_ALG_INTERNAL,
166 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
167 .base.cra_ctxsize = sizeof(struct serpent_ctx),
168 .base.cra_module = THIS_MODULE,
169 .min_keysize = SERPENT_MIN_KEY_SIZE,
170 .max_keysize = SERPENT_MAX_KEY_SIZE,
171 .setkey = serpent_setkey_skcipher,
172 .encrypt = ecb_encrypt,
173 .decrypt = ecb_decrypt,
174 }, {
175 .base.cra_name = "__cbc(serpent)",
176 .base.cra_driver_name = "__cbc-serpent-sse2",
177 .base.cra_priority = 400,
178 .base.cra_flags = CRYPTO_ALG_INTERNAL,
179 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
180 .base.cra_ctxsize = sizeof(struct serpent_ctx),
181 .base.cra_module = THIS_MODULE,
182 .min_keysize = SERPENT_MIN_KEY_SIZE,
183 .max_keysize = SERPENT_MAX_KEY_SIZE,
184 .ivsize = SERPENT_BLOCK_SIZE,
185 .setkey = serpent_setkey_skcipher,
186 .encrypt = cbc_encrypt,
187 .decrypt = cbc_decrypt,
188 }, {
189 .base.cra_name = "__ctr(serpent)",
190 .base.cra_driver_name = "__ctr-serpent-sse2",
191 .base.cra_priority = 400,
192 .base.cra_flags = CRYPTO_ALG_INTERNAL,
193 .base.cra_blocksize = 1,
194 .base.cra_ctxsize = sizeof(struct serpent_ctx),
195 .base.cra_module = THIS_MODULE,
196 .min_keysize = SERPENT_MIN_KEY_SIZE,
197 .max_keysize = SERPENT_MAX_KEY_SIZE,
198 .ivsize = SERPENT_BLOCK_SIZE,
199 .chunksize = SERPENT_BLOCK_SIZE,
200 .setkey = serpent_setkey_skcipher,
201 .encrypt = ctr_crypt,
202 .decrypt = ctr_crypt,
203 },
204 };
205
206 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
207
serpent_sse2_init(void)208 static int __init serpent_sse2_init(void)
209 {
210 if (!boot_cpu_has(X86_FEATURE_XMM2)) {
211 printk(KERN_INFO "SSE2 instructions are not detected.\n");
212 return -ENODEV;
213 }
214
215 return simd_register_skciphers_compat(serpent_algs,
216 ARRAY_SIZE(serpent_algs),
217 serpent_simd_algs);
218 }
219
serpent_sse2_exit(void)220 static void __exit serpent_sse2_exit(void)
221 {
222 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
223 serpent_simd_algs);
224 }
225
226 module_init(serpent_sse2_init);
227 module_exit(serpent_sse2_exit);
228
229 MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
230 MODULE_LICENSE("GPL");
231 MODULE_ALIAS_CRYPTO("serpent");
232