1 /* 2 * Glue Code for x86_64/AVX2 assembler optimized version of Serpent 3 * 4 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> 5 * 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. 10 * 11 */ 12 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> 23 24 #define SERPENT_AVX2_PARALLEL_BLOCKS 16 25 26 /* 16-way AVX2 parallel cipher functions */ 27 asmlinkage void serpent_ecb_enc_16way(struct serpent_ctx *ctx, u8 *dst, 28 const u8 *src); 29 asmlinkage void serpent_ecb_dec_16way(struct serpent_ctx *ctx, u8 *dst, 30 const u8 *src); 31 asmlinkage void serpent_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src); 32 33 asmlinkage void serpent_ctr_16way(void *ctx, u128 *dst, const u128 *src, 34 le128 *iv); 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); 39 40 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm, 41 const u8 *key, unsigned int keylen) 42 { 43 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen); 44 } 45 46 static const struct common_glue_ctx serpent_enc = { 47 .num_funcs = 3, 48 .fpu_blocks_limit = 8, 49 50 .funcs = { { 51 .num_blocks = 16, 52 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_16way) } 53 }, { 54 .num_blocks = 8, 55 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) } 56 }, { 57 .num_blocks = 1, 58 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) } 59 } } 60 }; 61 62 static const struct common_glue_ctx serpent_ctr = { 63 .num_funcs = 3, 64 .fpu_blocks_limit = 8, 65 66 .funcs = { { 67 .num_blocks = 16, 68 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_16way) } 69 }, { 70 .num_blocks = 8, 71 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) } 72 }, { 73 .num_blocks = 1, 74 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(__serpent_crypt_ctr) } 75 } } 76 }; 77 78 static const struct common_glue_ctx serpent_enc_xts = { 79 .num_funcs = 3, 80 .fpu_blocks_limit = 8, 81 82 .funcs = { { 83 .num_blocks = 16, 84 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_16way) } 85 }, { 86 .num_blocks = 8, 87 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) } 88 }, { 89 .num_blocks = 1, 90 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) } 91 } } 92 }; 93 94 static const struct common_glue_ctx serpent_dec = { 95 .num_funcs = 3, 96 .fpu_blocks_limit = 8, 97 98 .funcs = { { 99 .num_blocks = 16, 100 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_16way) } 101 }, { 102 .num_blocks = 8, 103 .fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) } 104 }, { 105 .num_blocks = 1, 106 .fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) } 107 } } 108 }; 109 110 static const struct common_glue_ctx serpent_dec_cbc = { 111 .num_funcs = 3, 112 .fpu_blocks_limit = 8, 113 114 .funcs = { { 115 .num_blocks = 16, 116 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_16way) } 117 }, { 118 .num_blocks = 8, 119 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) } 120 }, { 121 .num_blocks = 1, 122 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) } 123 } } 124 }; 125 126 static const struct common_glue_ctx serpent_dec_xts = { 127 .num_funcs = 3, 128 .fpu_blocks_limit = 8, 129 130 .funcs = { { 131 .num_blocks = 16, 132 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_16way) } 133 }, { 134 .num_blocks = 8, 135 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) } 136 }, { 137 .num_blocks = 1, 138 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) } 139 } } 140 }; 141 142 static int ecb_encrypt(struct skcipher_request *req) 143 { 144 return glue_ecb_req_128bit(&serpent_enc, req); 145 } 146 147 static int ecb_decrypt(struct skcipher_request *req) 148 { 149 return glue_ecb_req_128bit(&serpent_dec, req); 150 } 151 152 static int cbc_encrypt(struct skcipher_request *req) 153 { 154 return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__serpent_encrypt), 155 req); 156 } 157 158 static int cbc_decrypt(struct skcipher_request *req) 159 { 160 return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req); 161 } 162 163 static int ctr_crypt(struct skcipher_request *req) 164 { 165 return glue_ctr_req_128bit(&serpent_ctr, req); 166 } 167 168 static int xts_encrypt(struct skcipher_request *req) 169 { 170 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 171 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 172 173 return glue_xts_req_128bit(&serpent_enc_xts, req, 174 XTS_TWEAK_CAST(__serpent_encrypt), 175 &ctx->tweak_ctx, &ctx->crypt_ctx); 176 } 177 178 static int xts_decrypt(struct skcipher_request *req) 179 { 180 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 181 struct serpent_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 182 183 return glue_xts_req_128bit(&serpent_dec_xts, req, 184 XTS_TWEAK_CAST(__serpent_encrypt), 185 &ctx->tweak_ctx, &ctx->crypt_ctx); 186 } 187 188 static struct skcipher_alg serpent_algs[] = { 189 { 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, 202 }, { 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, 216 }, { 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, 231 }, { 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, 245 }, 246 }; 247 248 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)]; 249 250 static int __init init(void) 251 { 252 const char *feature_name; 253 254 if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) { 255 pr_info("AVX2 instructions are not detected.\n"); 256 return -ENODEV; 257 } 258 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, 259 &feature_name)) { 260 pr_info("CPU feature '%s' is not supported.\n", feature_name); 261 return -ENODEV; 262 } 263 264 return simd_register_skciphers_compat(serpent_algs, 265 ARRAY_SIZE(serpent_algs), 266 serpent_simd_algs); 267 } 268 269 static void __exit fini(void) 270 { 271 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs), 272 serpent_simd_algs); 273 } 274 275 module_init(init); 276 module_exit(fini); 277 278 MODULE_LICENSE("GPL"); 279 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized"); 280 MODULE_ALIAS_CRYPTO("serpent"); 281 MODULE_ALIAS_CRYPTO("serpent-asm"); 282