arch/x86/crypto/serpent_sse2_glue.c

   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
  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
  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
  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
  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
 143 static int ecb_encrypt(struct skcipher_request *req)
 144 {
 145         return glue_ecb_req_128bit(&serpent_enc, req);
 146 }
 147
 148 static int ecb_decrypt(struct skcipher_request *req)
 149 {
 150         return glue_ecb_req_128bit(&serpent_dec, req);
 151 }
 152
 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
 159 static int cbc_decrypt(struct skcipher_request *req)
 160 {
 161         return glue_cbc_decrypt_req_128bit(&serpent_dec_cbc, req);
 162 }
 163
 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
 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
 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");