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