1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Glue Code for assembler optimized version of 3DES
7 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
9 * CTR part based on code (crypto/ctr.c) by:
13 #include <crypto/algapi.h>
14 #include <crypto/des.h>
15 #include <crypto/internal/skcipher.h>
16 #include <linux/crypto.h>
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/types.h>
21 struct des3_ede_x86_ctx {
22 struct des3_ede_ctx enc;
23 struct des3_ede_ctx dec;
26 /* regular block cipher functions */
27 asmlinkage void des3_ede_x86_64_crypt_blk(const u32 *expkey, u8 *dst,
30 /* 3-way parallel cipher functions */
31 asmlinkage void des3_ede_x86_64_crypt_blk_3way(const u32 *expkey, u8 *dst,
34 static inline void des3_ede_enc_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
37 u32 *enc_ctx = ctx->enc.expkey;
39 des3_ede_x86_64_crypt_blk(enc_ctx, dst, src);
42 static inline void des3_ede_dec_blk(struct des3_ede_x86_ctx *ctx, u8 *dst,
45 u32 *dec_ctx = ctx->dec.expkey;
47 des3_ede_x86_64_crypt_blk(dec_ctx, dst, src);
50 static inline void des3_ede_enc_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst,
53 u32 *enc_ctx = ctx->enc.expkey;
55 des3_ede_x86_64_crypt_blk_3way(enc_ctx, dst, src);
58 static inline void des3_ede_dec_blk_3way(struct des3_ede_x86_ctx *ctx, u8 *dst,
61 u32 *dec_ctx = ctx->dec.expkey;
63 des3_ede_x86_64_crypt_blk_3way(dec_ctx, dst, src);
66 static void des3_ede_x86_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
68 des3_ede_enc_blk(crypto_tfm_ctx(tfm), dst, src);
71 static void des3_ede_x86_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
73 des3_ede_dec_blk(crypto_tfm_ctx(tfm), dst, src);
76 static int ecb_crypt(struct skcipher_request *req, const u32 *expkey)
78 const unsigned int bsize = DES3_EDE_BLOCK_SIZE;
79 struct skcipher_walk walk;
83 err = skcipher_walk_virt(&walk, req, false);
85 while ((nbytes = walk.nbytes)) {
86 u8 *wsrc = walk.src.virt.addr;
87 u8 *wdst = walk.dst.virt.addr;
89 /* Process four block batch */
90 if (nbytes >= bsize * 3) {
92 des3_ede_x86_64_crypt_blk_3way(expkey, wdst,
98 } while (nbytes >= bsize * 3);
104 /* Handle leftovers */
106 des3_ede_x86_64_crypt_blk(expkey, wdst, wsrc);
111 } while (nbytes >= bsize);
114 err = skcipher_walk_done(&walk, nbytes);
120 static int ecb_encrypt(struct skcipher_request *req)
122 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
123 struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
125 return ecb_crypt(req, ctx->enc.expkey);
128 static int ecb_decrypt(struct skcipher_request *req)
130 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
131 struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
133 return ecb_crypt(req, ctx->dec.expkey);
136 static unsigned int __cbc_encrypt(struct des3_ede_x86_ctx *ctx,
137 struct skcipher_walk *walk)
139 unsigned int bsize = DES3_EDE_BLOCK_SIZE;
140 unsigned int nbytes = walk->nbytes;
141 u64 *src = (u64 *)walk->src.virt.addr;
142 u64 *dst = (u64 *)walk->dst.virt.addr;
143 u64 *iv = (u64 *)walk->iv;
147 des3_ede_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
153 } while (nbytes >= bsize);
155 *(u64 *)walk->iv = *iv;
159 static int cbc_encrypt(struct skcipher_request *req)
161 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
162 struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
163 struct skcipher_walk walk;
167 err = skcipher_walk_virt(&walk, req, false);
169 while ((nbytes = walk.nbytes)) {
170 nbytes = __cbc_encrypt(ctx, &walk);
171 err = skcipher_walk_done(&walk, nbytes);
177 static unsigned int __cbc_decrypt(struct des3_ede_x86_ctx *ctx,
178 struct skcipher_walk *walk)
180 unsigned int bsize = DES3_EDE_BLOCK_SIZE;
181 unsigned int nbytes = walk->nbytes;
182 u64 *src = (u64 *)walk->src.virt.addr;
183 u64 *dst = (u64 *)walk->dst.virt.addr;
187 /* Start of the last block. */
188 src += nbytes / bsize - 1;
189 dst += nbytes / bsize - 1;
193 /* Process four block batch */
194 if (nbytes >= bsize * 3) {
196 nbytes -= bsize * 3 - bsize;
203 des3_ede_dec_blk_3way(ctx, (u8 *)dst, (u8 *)src);
215 } while (nbytes >= bsize * 3);
218 /* Handle leftovers */
220 des3_ede_dec_blk(ctx, (u8 *)dst, (u8 *)src);
232 *dst ^= *(u64 *)walk->iv;
233 *(u64 *)walk->iv = last_iv;
238 static int cbc_decrypt(struct skcipher_request *req)
240 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
241 struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
242 struct skcipher_walk walk;
246 err = skcipher_walk_virt(&walk, req, false);
248 while ((nbytes = walk.nbytes)) {
249 nbytes = __cbc_decrypt(ctx, &walk);
250 err = skcipher_walk_done(&walk, nbytes);
256 static void ctr_crypt_final(struct des3_ede_x86_ctx *ctx,
257 struct skcipher_walk *walk)
259 u8 *ctrblk = walk->iv;
260 u8 keystream[DES3_EDE_BLOCK_SIZE];
261 u8 *src = walk->src.virt.addr;
262 u8 *dst = walk->dst.virt.addr;
263 unsigned int nbytes = walk->nbytes;
265 des3_ede_enc_blk(ctx, keystream, ctrblk);
266 crypto_xor_cpy(dst, keystream, src, nbytes);
268 crypto_inc(ctrblk, DES3_EDE_BLOCK_SIZE);
271 static unsigned int __ctr_crypt(struct des3_ede_x86_ctx *ctx,
272 struct skcipher_walk *walk)
274 unsigned int bsize = DES3_EDE_BLOCK_SIZE;
275 unsigned int nbytes = walk->nbytes;
276 __be64 *src = (__be64 *)walk->src.virt.addr;
277 __be64 *dst = (__be64 *)walk->dst.virt.addr;
278 u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
281 /* Process four block batch */
282 if (nbytes >= bsize * 3) {
284 /* create ctrblks for parallel encrypt */
285 ctrblocks[0] = cpu_to_be64(ctrblk++);
286 ctrblocks[1] = cpu_to_be64(ctrblk++);
287 ctrblocks[2] = cpu_to_be64(ctrblk++);
289 des3_ede_enc_blk_3way(ctx, (u8 *)ctrblocks,
292 dst[0] = src[0] ^ ctrblocks[0];
293 dst[1] = src[1] ^ ctrblocks[1];
294 dst[2] = src[2] ^ ctrblocks[2];
298 } while ((nbytes -= bsize * 3) >= bsize * 3);
304 /* Handle leftovers */
306 ctrblocks[0] = cpu_to_be64(ctrblk++);
308 des3_ede_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
310 dst[0] = src[0] ^ ctrblocks[0];
314 } while ((nbytes -= bsize) >= bsize);
317 *(__be64 *)walk->iv = cpu_to_be64(ctrblk);
321 static int ctr_crypt(struct skcipher_request *req)
323 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
324 struct des3_ede_x86_ctx *ctx = crypto_skcipher_ctx(tfm);
325 struct skcipher_walk walk;
329 err = skcipher_walk_virt(&walk, req, false);
331 while ((nbytes = walk.nbytes) >= DES3_EDE_BLOCK_SIZE) {
332 nbytes = __ctr_crypt(ctx, &walk);
333 err = skcipher_walk_done(&walk, nbytes);
337 ctr_crypt_final(ctx, &walk);
338 err = skcipher_walk_done(&walk, 0);
344 static int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key,
347 struct des3_ede_x86_ctx *ctx = crypto_tfm_ctx(tfm);
351 err = des3_ede_expand_key(&ctx->enc, key, keylen);
352 if (err == -ENOKEY) {
353 if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
360 memset(ctx, 0, sizeof(*ctx));
364 /* Fix encryption context for this implementation and form decryption
366 j = DES3_EDE_EXPKEY_WORDS - 2;
367 for (i = 0; i < DES3_EDE_EXPKEY_WORDS; i += 2, j -= 2) {
368 tmp = ror32(ctx->enc.expkey[i + 1], 4);
369 ctx->enc.expkey[i + 1] = tmp;
371 ctx->dec.expkey[j + 0] = ctx->enc.expkey[i + 0];
372 ctx->dec.expkey[j + 1] = tmp;
378 static int des3_ede_x86_setkey_skcipher(struct crypto_skcipher *tfm,
382 return des3_ede_x86_setkey(&tfm->base, key, keylen);
385 static struct crypto_alg des3_ede_cipher = {
386 .cra_name = "des3_ede",
387 .cra_driver_name = "des3_ede-asm",
389 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
390 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
391 .cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
393 .cra_module = THIS_MODULE,
396 .cia_min_keysize = DES3_EDE_KEY_SIZE,
397 .cia_max_keysize = DES3_EDE_KEY_SIZE,
398 .cia_setkey = des3_ede_x86_setkey,
399 .cia_encrypt = des3_ede_x86_encrypt,
400 .cia_decrypt = des3_ede_x86_decrypt,
405 static struct skcipher_alg des3_ede_skciphers[] = {
407 .base.cra_name = "ecb(des3_ede)",
408 .base.cra_driver_name = "ecb-des3_ede-asm",
409 .base.cra_priority = 300,
410 .base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
411 .base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
412 .base.cra_module = THIS_MODULE,
413 .min_keysize = DES3_EDE_KEY_SIZE,
414 .max_keysize = DES3_EDE_KEY_SIZE,
415 .setkey = des3_ede_x86_setkey_skcipher,
416 .encrypt = ecb_encrypt,
417 .decrypt = ecb_decrypt,
419 .base.cra_name = "cbc(des3_ede)",
420 .base.cra_driver_name = "cbc-des3_ede-asm",
421 .base.cra_priority = 300,
422 .base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
423 .base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
424 .base.cra_module = THIS_MODULE,
425 .min_keysize = DES3_EDE_KEY_SIZE,
426 .max_keysize = DES3_EDE_KEY_SIZE,
427 .ivsize = DES3_EDE_BLOCK_SIZE,
428 .setkey = des3_ede_x86_setkey_skcipher,
429 .encrypt = cbc_encrypt,
430 .decrypt = cbc_decrypt,
432 .base.cra_name = "ctr(des3_ede)",
433 .base.cra_driver_name = "ctr-des3_ede-asm",
434 .base.cra_priority = 300,
435 .base.cra_blocksize = 1,
436 .base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
437 .base.cra_module = THIS_MODULE,
438 .min_keysize = DES3_EDE_KEY_SIZE,
439 .max_keysize = DES3_EDE_KEY_SIZE,
440 .ivsize = DES3_EDE_BLOCK_SIZE,
441 .chunksize = DES3_EDE_BLOCK_SIZE,
442 .setkey = des3_ede_x86_setkey_skcipher,
443 .encrypt = ctr_crypt,
444 .decrypt = ctr_crypt,
448 static bool is_blacklisted_cpu(void)
450 if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
453 if (boot_cpu_data.x86 == 0x0f) {
455 * On Pentium 4, des3_ede-x86_64 is slower than generic C
456 * implementation because use of 64bit rotates (which are really
457 * slow on P4). Therefore blacklist P4s.
466 module_param(force, int, 0);
467 MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
469 static int __init des3_ede_x86_init(void)
473 if (!force && is_blacklisted_cpu()) {
474 pr_info("des3_ede-x86_64: performance on this CPU would be suboptimal: disabling des3_ede-x86_64.\n");
478 err = crypto_register_alg(&des3_ede_cipher);
482 err = crypto_register_skciphers(des3_ede_skciphers,
483 ARRAY_SIZE(des3_ede_skciphers));
485 crypto_unregister_alg(&des3_ede_cipher);
490 static void __exit des3_ede_x86_fini(void)
492 crypto_unregister_alg(&des3_ede_cipher);
493 crypto_unregister_skciphers(des3_ede_skciphers,
494 ARRAY_SIZE(des3_ede_skciphers));
497 module_init(des3_ede_x86_init);
498 module_exit(des3_ede_x86_fini);
500 MODULE_LICENSE("GPL");
501 MODULE_DESCRIPTION("Triple DES EDE Cipher Algorithm, asm optimized");
502 MODULE_ALIAS_CRYPTO("des3_ede");
503 MODULE_ALIAS_CRYPTO("des3_ede-asm");