This source file includes following definitions.
- serpent_setkey_skcipher
- serpent_decrypt_cbc_xway
- serpent_crypt_ctr
- serpent_crypt_ctr_xway
- ecb_encrypt
- ecb_decrypt
- cbc_encrypt
- cbc_decrypt
- ctr_crypt
- serpent_sse2_init
- serpent_sse2_exit
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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
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
34 static void serpent_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
35 {
36 u128 ivs[SERPENT_PARALLEL_BLOCKS - 1];
37 unsigned int j;
38
39 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
40 ivs[j] = src[j];
41
42 serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
43
44 for (j = 0; j < SERPENT_PARALLEL_BLOCKS - 1; j++)
45 u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
46 }
47
48 static void serpent_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
49 {
50 be128 ctrblk;
51
52 le128_to_be128(&ctrblk, iv);
53 le128_inc(iv);
54
55 __serpent_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
56 u128_xor(dst, src, (u128 *)&ctrblk);
57 }
58
59 static void serpent_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
60 le128 *iv)
61 {
62 be128 ctrblks[SERPENT_PARALLEL_BLOCKS];
63 unsigned int i;
64
65 for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) {
66 if (dst != src)
67 dst[i] = src[i];
68
69 le128_to_be128(&ctrblks[i], iv);
70 le128_inc(iv);
71 }
72
73 serpent_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
74 }
75
76 static const struct common_glue_ctx serpent_enc = {
77 .num_funcs = 2,
78 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
79
80 .funcs = { {
81 .num_blocks = SERPENT_PARALLEL_BLOCKS,
82 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_enc_blk_xway) }
83 }, {
84 .num_blocks = 1,
85 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
86 } }
87 };
88
89 static const struct common_glue_ctx serpent_ctr = {
90 .num_funcs = 2,
91 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
92
93 .funcs = { {
94 .num_blocks = SERPENT_PARALLEL_BLOCKS,
95 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr_xway) }
96 }, {
97 .num_blocks = 1,
98 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_crypt_ctr) }
99 } }
100 };
101
102 static const struct common_glue_ctx serpent_dec = {
103 .num_funcs = 2,
104 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
105
106 .funcs = { {
107 .num_blocks = SERPENT_PARALLEL_BLOCKS,
108 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_dec_blk_xway) }
109 }, {
110 .num_blocks = 1,
111 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
112 } }
113 };
114
115 static const struct common_glue_ctx serpent_dec_cbc = {
116 .num_funcs = 2,
117 .fpu_blocks_limit = SERPENT_PARALLEL_BLOCKS,
118
119 .funcs = { {
120 .num_blocks = SERPENT_PARALLEL_BLOCKS,
121 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_decrypt_cbc_xway) }
122 }, {
123 .num_blocks = 1,
124 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
125 } }
126 };
127
128 static int ecb_encrypt(struct skcipher_request *req)
129 {
130 return glue_ecb_req_128bit(&serpent_enc, req);
131 }
132
133 static int ecb_decrypt(struct skcipher_request *req)
134 {
135 return glue_ecb_req_128bit(&serpent_dec, req);
136 }
137
138 static int cbc_encrypt(struct skcipher_request *req)
139 {
140 return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt),
141 req);
142 }
143
144 static int cbc_decrypt(struct skcipher_request *req)
145 {
146 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
147 }
148
149 static int ctr_crypt(struct skcipher_request *req)
150 {
151 return glue_ctr_req_128bit(&serpent_ctr, req);
152 }
153
154 static struct skcipher_alg serpent_algs[] = {
155 {
156 .base.cra_name = "__ecb(serpent)",
157 .base.cra_driver_name = "__ecb-serpent-sse2",
158 .base.cra_priority = 400,
159 .base.cra_flags = CRYPTO_ALG_INTERNAL,
160 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
161 .base.cra_ctxsize = sizeof(struct serpent_ctx),
162 .base.cra_module = THIS_MODULE,
163 .min_keysize = SERPENT_MIN_KEY_SIZE,
164 .max_keysize = SERPENT_MAX_KEY_SIZE,
165 .setkey = serpent_setkey_skcipher,
166 .encrypt = ecb_encrypt,
167 .decrypt = ecb_decrypt,
168 }, {
169 .base.cra_name = "__cbc(serpent)",
170 .base.cra_driver_name = "__cbc-serpent-sse2",
171 .base.cra_priority = 400,
172 .base.cra_flags = CRYPTO_ALG_INTERNAL,
173 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
174 .base.cra_ctxsize = sizeof(struct serpent_ctx),
175 .base.cra_module = THIS_MODULE,
176 .min_keysize = SERPENT_MIN_KEY_SIZE,
177 .max_keysize = SERPENT_MAX_KEY_SIZE,
178 .ivsize = SERPENT_BLOCK_SIZE,
179 .setkey = serpent_setkey_skcipher,
180 .encrypt = cbc_encrypt,
181 .decrypt = cbc_decrypt,
182 }, {
183 .base.cra_name = "__ctr(serpent)",
184 .base.cra_driver_name = "__ctr-serpent-sse2",
185 .base.cra_priority = 400,
186 .base.cra_flags = CRYPTO_ALG_INTERNAL,
187 .base.cra_blocksize = 1,
188 .base.cra_ctxsize = sizeof(struct serpent_ctx),
189 .base.cra_module = THIS_MODULE,
190 .min_keysize = SERPENT_MIN_KEY_SIZE,
191 .max_keysize = SERPENT_MAX_KEY_SIZE,
192 .ivsize = SERPENT_BLOCK_SIZE,
193 .chunksize = SERPENT_BLOCK_SIZE,
194 .setkey = serpent_setkey_skcipher,
195 .encrypt = ctr_crypt,
196 .decrypt = ctr_crypt,
197 },
198 };
199
200 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
201
202 static int __init serpent_sse2_init(void)
203 {
204 if (!boot_cpu_has(X86_FEATURE_XMM2)) {
205 printk(KERN_INFO "SSE2 instructions are not detected.\n");
206 return -ENODEV;
207 }
208
209 return simd_register_skciphers_compat(serpent_algs,
210 ARRAY_SIZE(serpent_algs),
211 serpent_simd_algs);
212 }
213
214 static void __exit serpent_sse2_exit(void)
215 {
216 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
217 serpent_simd_algs);
218 }
219
220 module_init(serpent_sse2_init);
221 module_exit(serpent_sse2_exit);
222
223 MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
224 MODULE_LICENSE("GPL");
225 MODULE_ALIAS_CRYPTO("serpent");