arch/sparc/crypto/camellia_glue.c

   1 /* Glue code for CAMELLIA encryption optimized for sparc64 crypto opcodes.
   2  *
   3  * Copyright (C) 2012 David S. Miller <[email protected]>
   4  */
   5
   6 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/crypto.h>
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/mm.h>
  12 #include <linux/types.h>
  13 #include <crypto/algapi.h>
  14
  15 #include <asm/fpumacro.h>
  16 #include <asm/pstate.h>
  17 #include <asm/elf.h>
  18
  19 #include "opcodes.h"
  20
  21 #define CAMELLIA_MIN_KEY_SIZE        16
  22 #define CAMELLIA_MAX_KEY_SIZE        32
  23 #define CAMELLIA_BLOCK_SIZE          16
  24 #define CAMELLIA_TABLE_BYTE_LEN     272
  25
  26 struct camellia_sparc64_ctx {
  27         u64 encrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
  28         u64 decrypt_key[CAMELLIA_TABLE_BYTE_LEN / sizeof(u64)];
  29         int key_len;
  30 };
  31
  32 extern void camellia_sparc64_key_expand(const u32 *in_key, u64 *encrypt_key,
  33                                         unsigned int key_len, u64 *decrypt_key);
  34
  35 static int camellia_set_key(struct crypto_tfm *tfm, const u8 *_in_key,
  36                             unsigned int key_len)
  37 {
  38         struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
  39         const u32 *in_key = (const u32 *) _in_key;
  40         u32 *flags = &tfm->crt_flags;
  41
  42         if (key_len != 16 && key_len != 24 && key_len != 32) {
  43                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
  44                 return -EINVAL;
  45         }
  46
  47         ctx->key_len = key_len;
  48
  49         camellia_sparc64_key_expand(in_key, &ctx->encrypt_key[0],
  50                                     key_len, &ctx->decrypt_key[0]);
  51         return 0;
  52 }
  53
  54 extern void camellia_sparc64_crypt(const u64 *key, const u32 *input,
  55                                    u32 *output, unsigned int key_len);
  56
  57 static void camellia_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  58 {
  59         struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
  60
  61         camellia_sparc64_crypt(&ctx->encrypt_key[0],
  62                                (const u32 *) src,
  63                                (u32 *) dst, ctx->key_len);
  64 }
  65
  66 static void camellia_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  67 {
  68         struct camellia_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
  69
  70         camellia_sparc64_crypt(&ctx->decrypt_key[0],
  71                                (const u32 *) src,
  72                                (u32 *) dst, ctx->key_len);
  73 }
  74
  75 extern void camellia_sparc64_load_keys(const u64 *key, unsigned int key_len);
  76
  77 typedef void ecb_crypt_op(const u64 *input, u64 *output, unsigned int len,
  78                           const u64 *key);
  79
  80 extern ecb_crypt_op camellia_sparc64_ecb_crypt_3_grand_rounds;
  81 extern ecb_crypt_op camellia_sparc64_ecb_crypt_4_grand_rounds;
  82
  83 #define CAMELLIA_BLOCK_MASK     (~(CAMELLIA_BLOCK_SIZE - 1))
  84
  85 static int __ecb_crypt(struct blkcipher_desc *desc,
  86                        struct scatterlist *dst, struct scatterlist *src,
  87                        unsigned int nbytes, bool encrypt)
  88 {
  89         struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
  90         struct blkcipher_walk walk;
  91         ecb_crypt_op *op;
  92         const u64 *key;
  93         int err;
  94
  95         op = camellia_sparc64_ecb_crypt_3_grand_rounds;
  96         if (ctx->key_len != 16)
  97                 op = camellia_sparc64_ecb_crypt_4_grand_rounds;
  98
  99         blkcipher_walk_init(&walk, dst, src, nbytes);
 100         err = blkcipher_walk_virt(desc, &walk);
 101         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 102
 103         if (encrypt)
 104                 key = &ctx->encrypt_key[0];
 105         else
 106                 key = &ctx->decrypt_key[0];
 107         camellia_sparc64_load_keys(key, ctx->key_len);
 108         while ((nbytes = walk.nbytes)) {
 109                 unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
 110
 111                 if (likely(block_len)) {
 112                         const u64 *src64;
 113                         u64 *dst64;
 114
 115                         src64 = (const u64 *)walk.src.virt.addr;
 116                         dst64 = (u64 *) walk.dst.virt.addr;
 117                         op(src64, dst64, block_len, key);
 118                 }
 119                 nbytes &= CAMELLIA_BLOCK_SIZE - 1;
 120                 err = blkcipher_walk_done(desc, &walk, nbytes);
 121         }
 122         fprs_write(0);
 123         return err;
 124 }
 125
 126 static int ecb_encrypt(struct blkcipher_desc *desc,
 127                        struct scatterlist *dst, struct scatterlist *src,
 128                        unsigned int nbytes)
 129 {
 130         return __ecb_crypt(desc, dst, src, nbytes, true);
 131 }
 132
 133 static int ecb_decrypt(struct blkcipher_desc *desc,
 134                        struct scatterlist *dst, struct scatterlist *src,
 135                        unsigned int nbytes)
 136 {
 137         return __ecb_crypt(desc, dst, src, nbytes, false);
 138 }
 139
 140 typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len,
 141                           const u64 *key, u64 *iv);
 142
 143 extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds;
 144 extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds;
 145 extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds;
 146 extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds;
 147
 148 static int cbc_encrypt(struct blkcipher_desc *desc,
 149                        struct scatterlist *dst, struct scatterlist *src,
 150                        unsigned int nbytes)
 151 {
 152         struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 153         struct blkcipher_walk walk;
 154         cbc_crypt_op *op;
 155         const u64 *key;
 156         int err;
 157
 158         op = camellia_sparc64_cbc_encrypt_3_grand_rounds;
 159         if (ctx->key_len != 16)
 160                 op = camellia_sparc64_cbc_encrypt_4_grand_rounds;
 161
 162         blkcipher_walk_init(&walk, dst, src, nbytes);
 163         err = blkcipher_walk_virt(desc, &walk);
 164         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 165
 166         key = &ctx->encrypt_key[0];
 167         camellia_sparc64_load_keys(key, ctx->key_len);
 168         while ((nbytes = walk.nbytes)) {
 169                 unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
 170
 171                 if (likely(block_len)) {
 172                         const u64 *src64;
 173                         u64 *dst64;
 174
 175                         src64 = (const u64 *)walk.src.virt.addr;
 176                         dst64 = (u64 *) walk.dst.virt.addr;
 177                         op(src64, dst64, block_len, key,
 178                            (u64 *) walk.iv);
 179                 }
 180                 nbytes &= CAMELLIA_BLOCK_SIZE - 1;
 181                 err = blkcipher_walk_done(desc, &walk, nbytes);
 182         }
 183         fprs_write(0);
 184         return err;
 185 }
 186
 187 static int cbc_decrypt(struct blkcipher_desc *desc,
 188                        struct scatterlist *dst, struct scatterlist *src,
 189                        unsigned int nbytes)
 190 {
 191         struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 192         struct blkcipher_walk walk;
 193         cbc_crypt_op *op;
 194         const u64 *key;
 195         int err;
 196
 197         op = camellia_sparc64_cbc_decrypt_3_grand_rounds;
 198         if (ctx->key_len != 16)
 199                 op = camellia_sparc64_cbc_decrypt_4_grand_rounds;
 200
 201         blkcipher_walk_init(&walk, dst, src, nbytes);
 202         err = blkcipher_walk_virt(desc, &walk);
 203         desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 204
 205         key = &ctx->decrypt_key[0];
 206         camellia_sparc64_load_keys(key, ctx->key_len);
 207         while ((nbytes = walk.nbytes)) {
 208                 unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
 209
 210                 if (likely(block_len)) {
 211                         const u64 *src64;
 212                         u64 *dst64;
 213
 214                         src64 = (const u64 *)walk.src.virt.addr;
 215                         dst64 = (u64 *) walk.dst.virt.addr;
 216                         op(src64, dst64, block_len, key,
 217                            (u64 *) walk.iv);
 218                 }
 219                 nbytes &= CAMELLIA_BLOCK_SIZE - 1;
 220                 err = blkcipher_walk_done(desc, &walk, nbytes);
 221         }
 222         fprs_write(0);
 223         return err;
 224 }
 225
 226 static struct crypto_alg algs[] = { {
 227         .cra_name               = "camellia",
 228         .cra_driver_name        = "camellia-sparc64",
 229         .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 230         .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
 231         .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
 232         .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
 233         .cra_alignmask          = 3,
 234         .cra_module             = THIS_MODULE,
 235         .cra_u  = {
 236                 .cipher = {
 237                         .cia_min_keysize        = CAMELLIA_MIN_KEY_SIZE,
 238                         .cia_max_keysize        = CAMELLIA_MAX_KEY_SIZE,
 239                         .cia_setkey             = camellia_set_key,
 240                         .cia_encrypt            = camellia_encrypt,
 241                         .cia_decrypt            = camellia_decrypt
 242                 }
 243         }
 244 }, {
 245         .cra_name               = "ecb(camellia)",
 246         .cra_driver_name        = "ecb-camellia-sparc64",
 247         .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 248         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 249         .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
 250         .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
 251         .cra_alignmask          = 7,
 252         .cra_type               = &crypto_blkcipher_type,
 253         .cra_module             = THIS_MODULE,
 254         .cra_u = {
 255                 .blkcipher = {
 256                         .min_keysize    = CAMELLIA_MIN_KEY_SIZE,
 257                         .max_keysize    = CAMELLIA_MAX_KEY_SIZE,
 258                         .setkey         = camellia_set_key,
 259                         .encrypt        = ecb_encrypt,
 260                         .decrypt        = ecb_decrypt,
 261                 },
 262         },
 263 }, {
 264         .cra_name               = "cbc(camellia)",
 265         .cra_driver_name        = "cbc-camellia-sparc64",
 266         .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 267         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 268         .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
 269         .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
 270         .cra_alignmask          = 7,
 271         .cra_type               = &crypto_blkcipher_type,
 272         .cra_module             = THIS_MODULE,
 273         .cra_u = {
 274                 .blkcipher = {
 275                         .min_keysize    = CAMELLIA_MIN_KEY_SIZE,
 276                         .max_keysize    = CAMELLIA_MAX_KEY_SIZE,
 277                         .setkey         = camellia_set_key,
 278                         .encrypt        = cbc_encrypt,
 279                         .decrypt        = cbc_decrypt,
 280                 },
 281         },
 282 }
 283 };
 284
 285 static bool __init sparc64_has_camellia_opcode(void)
 286 {
 287         unsigned long cfr;
 288
 289         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 290                 return false;
 291
 292         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 293         if (!(cfr & CFR_CAMELLIA))
 294                 return false;
 295
 296         return true;
 297 }
 298
 299 static int __init camellia_sparc64_mod_init(void)
 300 {
 301         int i;
 302
 303         for (i = 0; i < ARRAY_SIZE(algs); i++)
 304                 INIT_LIST_HEAD(&algs[i].cra_list);
 305
 306         if (sparc64_has_camellia_opcode()) {
 307                 pr_info("Using sparc64 camellia opcodes optimized CAMELLIA implementation\n");
 308                 return crypto_register_algs(algs, ARRAY_SIZE(algs));
 309         }
 310         pr_info("sparc64 camellia opcodes not available.\n");
 311         return -ENODEV;
 312 }
 313
 314 static void __exit camellia_sparc64_mod_fini(void)
 315 {
 316         crypto_unregister_algs(algs, ARRAY_SIZE(algs));
 317 }
 318
 319 module_init(camellia_sparc64_mod_init);
 320 module_exit(camellia_sparc64_mod_fini);
 321
 322 MODULE_LICENSE("GPL");
 323 MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated");
 324
 325 MODULE_ALIAS_CRYPTO("camellia");
 326
 327 #include "crop_devid.c"