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 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("aes"); 326 327 #include "crop_devid.c" 328