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 <davem@davemloft.net>
   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
 102         if (encrypt)
 103                 key = &ctx->encrypt_key[0];
 104         else
 105                 key = &ctx->decrypt_key[0];
 106         camellia_sparc64_load_keys(key, ctx->key_len);
 107         while ((nbytes = walk.nbytes)) {
 108                 unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
 109
 110                 if (likely(block_len)) {
 111                         const u64 *src64;
 112                         u64 *dst64;
 113
 114                         src64 = (const u64 *)walk.src.virt.addr;
 115                         dst64 = (u64 *) walk.dst.virt.addr;
 116                         op(src64, dst64, block_len, key);
 117                 }
 118                 nbytes &= CAMELLIA_BLOCK_SIZE - 1;
 119                 err = blkcipher_walk_done(desc, &walk, nbytes);
 120         }
 121         fprs_write(0);
 122         return err;
 123 }
 124
 125 static int ecb_encrypt(struct blkcipher_desc *desc,
 126                        struct scatterlist *dst, struct scatterlist *src,
 127                        unsigned int nbytes)
 128 {
 129         return __ecb_crypt(desc, dst, src, nbytes, true);
 130 }
 131
 132 static int ecb_decrypt(struct blkcipher_desc *desc,
 133                        struct scatterlist *dst, struct scatterlist *src,
 134                        unsigned int nbytes)
 135 {
 136         return __ecb_crypt(desc, dst, src, nbytes, false);
 137 }
 138
 139 typedef void cbc_crypt_op(const u64 *input, u64 *output, unsigned int len,
 140                           const u64 *key, u64 *iv);
 141
 142 extern cbc_crypt_op camellia_sparc64_cbc_encrypt_3_grand_rounds;
 143 extern cbc_crypt_op camellia_sparc64_cbc_encrypt_4_grand_rounds;
 144 extern cbc_crypt_op camellia_sparc64_cbc_decrypt_3_grand_rounds;
 145 extern cbc_crypt_op camellia_sparc64_cbc_decrypt_4_grand_rounds;
 146
 147 static int cbc_encrypt(struct blkcipher_desc *desc,
 148                        struct scatterlist *dst, struct scatterlist *src,
 149                        unsigned int nbytes)
 150 {
 151         struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 152         struct blkcipher_walk walk;
 153         cbc_crypt_op *op;
 154         const u64 *key;
 155         int err;
 156
 157         op = camellia_sparc64_cbc_encrypt_3_grand_rounds;
 158         if (ctx->key_len != 16)
 159                 op = camellia_sparc64_cbc_encrypt_4_grand_rounds;
 160
 161         blkcipher_walk_init(&walk, dst, src, nbytes);
 162         err = blkcipher_walk_virt(desc, &walk);
 163
 164         key = &ctx->encrypt_key[0];
 165         camellia_sparc64_load_keys(key, ctx->key_len);
 166         while ((nbytes = walk.nbytes)) {
 167                 unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
 168
 169                 if (likely(block_len)) {
 170                         const u64 *src64;
 171                         u64 *dst64;
 172
 173                         src64 = (const u64 *)walk.src.virt.addr;
 174                         dst64 = (u64 *) walk.dst.virt.addr;
 175                         op(src64, dst64, block_len, key,
 176                            (u64 *) walk.iv);
 177                 }
 178                 nbytes &= CAMELLIA_BLOCK_SIZE - 1;
 179                 err = blkcipher_walk_done(desc, &walk, nbytes);
 180         }
 181         fprs_write(0);
 182         return err;
 183 }
 184
 185 static int cbc_decrypt(struct blkcipher_desc *desc,
 186                        struct scatterlist *dst, struct scatterlist *src,
 187                        unsigned int nbytes)
 188 {
 189         struct camellia_sparc64_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
 190         struct blkcipher_walk walk;
 191         cbc_crypt_op *op;
 192         const u64 *key;
 193         int err;
 194
 195         op = camellia_sparc64_cbc_decrypt_3_grand_rounds;
 196         if (ctx->key_len != 16)
 197                 op = camellia_sparc64_cbc_decrypt_4_grand_rounds;
 198
 199         blkcipher_walk_init(&walk, dst, src, nbytes);
 200         err = blkcipher_walk_virt(desc, &walk);
 201
 202         key = &ctx->decrypt_key[0];
 203         camellia_sparc64_load_keys(key, ctx->key_len);
 204         while ((nbytes = walk.nbytes)) {
 205                 unsigned int block_len = nbytes & CAMELLIA_BLOCK_MASK;
 206
 207                 if (likely(block_len)) {
 208                         const u64 *src64;
 209                         u64 *dst64;
 210
 211                         src64 = (const u64 *)walk.src.virt.addr;
 212                         dst64 = (u64 *) walk.dst.virt.addr;
 213                         op(src64, dst64, block_len, key,
 214                            (u64 *) walk.iv);
 215                 }
 216                 nbytes &= CAMELLIA_BLOCK_SIZE - 1;
 217                 err = blkcipher_walk_done(desc, &walk, nbytes);
 218         }
 219         fprs_write(0);
 220         return err;
 221 }
 222
 223 static struct crypto_alg algs[] = { {
 224         .cra_name               = "camellia",
 225         .cra_driver_name        = "camellia-sparc64",
 226         .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 227         .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
 228         .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
 229         .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
 230         .cra_alignmask          = 3,
 231         .cra_module             = THIS_MODULE,
 232         .cra_u  = {
 233                 .cipher = {
 234                         .cia_min_keysize        = CAMELLIA_MIN_KEY_SIZE,
 235                         .cia_max_keysize        = CAMELLIA_MAX_KEY_SIZE,
 236                         .cia_setkey             = camellia_set_key,
 237                         .cia_encrypt            = camellia_encrypt,
 238                         .cia_decrypt            = camellia_decrypt
 239                 }
 240         }
 241 }, {
 242         .cra_name               = "ecb(camellia)",
 243         .cra_driver_name        = "ecb-camellia-sparc64",
 244         .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 245         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 246         .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
 247         .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
 248         .cra_alignmask          = 7,
 249         .cra_type               = &crypto_blkcipher_type,
 250         .cra_module             = THIS_MODULE,
 251         .cra_u = {
 252                 .blkcipher = {
 253                         .min_keysize    = CAMELLIA_MIN_KEY_SIZE,
 254                         .max_keysize    = CAMELLIA_MAX_KEY_SIZE,
 255                         .setkey         = camellia_set_key,
 256                         .encrypt        = ecb_encrypt,
 257                         .decrypt        = ecb_decrypt,
 258                 },
 259         },
 260 }, {
 261         .cra_name               = "cbc(camellia)",
 262         .cra_driver_name        = "cbc-camellia-sparc64",
 263         .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 264         .cra_flags              = CRYPTO_ALG_TYPE_BLKCIPHER,
 265         .cra_blocksize          = CAMELLIA_BLOCK_SIZE,
 266         .cra_ctxsize            = sizeof(struct camellia_sparc64_ctx),
 267         .cra_alignmask          = 7,
 268         .cra_type               = &crypto_blkcipher_type,
 269         .cra_module             = THIS_MODULE,
 270         .cra_u = {
 271                 .blkcipher = {
 272                         .min_keysize    = CAMELLIA_MIN_KEY_SIZE,
 273                         .max_keysize    = CAMELLIA_MAX_KEY_SIZE,
 274                         .setkey         = camellia_set_key,
 275                         .encrypt        = cbc_encrypt,
 276                         .decrypt        = cbc_decrypt,
 277                 },
 278         },
 279 }
 280 };
 281
 282 static bool __init sparc64_has_camellia_opcode(void)
 283 {
 284         unsigned long cfr;
 285
 286         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 287                 return false;
 288
 289         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 290         if (!(cfr & CFR_CAMELLIA))
 291                 return false;
 292
 293         return true;
 294 }
 295
 296 static int __init camellia_sparc64_mod_init(void)
 297 {
 298         int i;
 299
 300         for (i = 0; i < ARRAY_SIZE(algs); i++)
 301                 INIT_LIST_HEAD(&algs[i].cra_list);
 302
 303         if (sparc64_has_camellia_opcode()) {
 304                 pr_info("Using sparc64 camellia opcodes optimized CAMELLIA implementation\n");
 305                 return crypto_register_algs(algs, ARRAY_SIZE(algs));
 306         }
 307         pr_info("sparc64 camellia opcodes not available.\n");
 308         return -ENODEV;
 309 }
 310
 311 static void __exit camellia_sparc64_mod_fini(void)
 312 {
 313         crypto_unregister_algs(algs, ARRAY_SIZE(algs));
 314 }
 315
 316 module_init(camellia_sparc64_mod_init);
 317 module_exit(camellia_sparc64_mod_fini);
 318
 319 MODULE_LICENSE("GPL");
 320 MODULE_DESCRIPTION("Camellia Cipher Algorithm, sparc64 camellia opcode accelerated");
 321
 322 MODULE_ALIAS("aes");
 323
 324 #include "crop_devid.c"