2 * Asynchronous block chaining cipher operations.
4 * This is the asynchronous version of blkcipher.c indicating completion
7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
16 #include <crypto/internal/skcipher.h>
17 #include <linux/err.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/seq_file.h>
21 #include <linux/cryptouser.h>
22 #include <net/netlink.h>
24 #include <crypto/scatterwalk.h>
28 struct ablkcipher_buffer {
29 struct list_head entry;
30 struct scatter_walk dst;
36 ABLKCIPHER_WALK_SLOW = 1 << 0,
39 static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
41 scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
44 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
46 struct ablkcipher_buffer *p, *tmp;
48 list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
49 ablkcipher_buffer_write(p);
54 EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
56 static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
57 struct ablkcipher_buffer *p)
60 list_add_tail(&p->entry, &walk->buffers);
63 /* Get a spot of the specified length that does not straddle a page.
64 * The caller needs to ensure that there is enough space for this operation.
66 static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
68 u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
70 return max(start, end_page);
73 static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk,
77 unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
79 if (len_this_page > n)
81 scatterwalk_advance(&walk->out, n);
82 if (n == len_this_page)
85 scatterwalk_start(&walk->out, sg_next(walk->out.sg));
89 static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk,
92 scatterwalk_advance(&walk->in, n);
93 scatterwalk_advance(&walk->out, n);
96 static int ablkcipher_walk_next(struct ablkcipher_request *req,
97 struct ablkcipher_walk *walk);
99 int ablkcipher_walk_done(struct ablkcipher_request *req,
100 struct ablkcipher_walk *walk, int err)
102 struct crypto_tfm *tfm = req->base.tfm;
103 unsigned int n; /* bytes processed */
106 if (unlikely(err < 0))
109 n = walk->nbytes - err;
111 more = (walk->total != 0);
113 if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) {
114 ablkcipher_done_fast(walk, n);
117 /* unexpected case; didn't process all bytes */
121 ablkcipher_done_slow(walk, n);
124 scatterwalk_done(&walk->in, 0, more);
125 scatterwalk_done(&walk->out, 1, more);
128 crypto_yield(req->base.flags);
129 return ablkcipher_walk_next(req, walk);
134 if (walk->iv != req->info)
135 memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
136 kfree(walk->iv_buffer);
139 EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
141 static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
142 struct ablkcipher_walk *walk,
144 unsigned int alignmask,
145 void **src_p, void **dst_p)
147 unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
148 struct ablkcipher_buffer *p;
149 void *src, *dst, *base;
152 n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
153 n += (aligned_bsize * 3 - (alignmask + 1) +
154 (alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
156 p = kmalloc(n, GFP_ATOMIC);
158 return ablkcipher_walk_done(req, walk, -ENOMEM);
162 dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
163 src = dst = ablkcipher_get_spot(dst, bsize);
168 scatterwalk_copychunks(src, &walk->in, bsize, 0);
170 ablkcipher_queue_write(walk, p);
172 walk->nbytes = bsize;
173 walk->flags |= ABLKCIPHER_WALK_SLOW;
181 static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
182 struct crypto_tfm *tfm,
183 unsigned int alignmask)
185 unsigned bs = walk->blocksize;
186 unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
187 unsigned aligned_bs = ALIGN(bs, alignmask + 1);
188 unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
192 size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
193 walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
194 if (!walk->iv_buffer)
197 iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
198 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
199 iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
200 iv = ablkcipher_get_spot(iv, ivsize);
202 walk->iv = memcpy(iv, walk->iv, ivsize);
206 static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
207 struct ablkcipher_walk *walk)
209 walk->src.page = scatterwalk_page(&walk->in);
210 walk->src.offset = offset_in_page(walk->in.offset);
211 walk->dst.page = scatterwalk_page(&walk->out);
212 walk->dst.offset = offset_in_page(walk->out.offset);
217 static int ablkcipher_walk_next(struct ablkcipher_request *req,
218 struct ablkcipher_walk *walk)
220 struct crypto_tfm *tfm = req->base.tfm;
221 unsigned int alignmask, bsize, n;
225 alignmask = crypto_tfm_alg_alignmask(tfm);
227 if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
228 req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
229 return ablkcipher_walk_done(req, walk, -EINVAL);
232 walk->flags &= ~ABLKCIPHER_WALK_SLOW;
235 bsize = min(walk->blocksize, n);
236 n = scatterwalk_clamp(&walk->in, n);
237 n = scatterwalk_clamp(&walk->out, n);
240 !scatterwalk_aligned(&walk->in, alignmask) ||
241 !scatterwalk_aligned(&walk->out, alignmask)) {
242 err = ablkcipher_next_slow(req, walk, bsize, alignmask,
244 goto set_phys_lowmem;
249 return ablkcipher_next_fast(req, walk);
253 walk->src.page = virt_to_page(src);
254 walk->dst.page = virt_to_page(dst);
255 walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
256 walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
262 static int ablkcipher_walk_first(struct ablkcipher_request *req,
263 struct ablkcipher_walk *walk)
265 struct crypto_tfm *tfm = req->base.tfm;
266 unsigned int alignmask;
268 alignmask = crypto_tfm_alg_alignmask(tfm);
269 if (WARN_ON_ONCE(in_irq()))
272 walk->iv = req->info;
273 walk->nbytes = walk->total;
274 if (unlikely(!walk->total))
277 walk->iv_buffer = NULL;
278 if (unlikely(((unsigned long)walk->iv & alignmask))) {
279 int err = ablkcipher_copy_iv(walk, tfm, alignmask);
285 scatterwalk_start(&walk->in, walk->in.sg);
286 scatterwalk_start(&walk->out, walk->out.sg);
288 return ablkcipher_walk_next(req, walk);
291 int ablkcipher_walk_phys(struct ablkcipher_request *req,
292 struct ablkcipher_walk *walk)
294 walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
295 return ablkcipher_walk_first(req, walk);
297 EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
299 static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
302 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
303 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
305 u8 *buffer, *alignbuffer;
306 unsigned long absize;
308 absize = keylen + alignmask;
309 buffer = kmalloc(absize, GFP_ATOMIC);
313 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
314 memcpy(alignbuffer, key, keylen);
315 ret = cipher->setkey(tfm, alignbuffer, keylen);
316 memset(alignbuffer, 0, keylen);
321 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
324 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
325 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
327 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
328 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
332 if ((unsigned long)key & alignmask)
333 return setkey_unaligned(tfm, key, keylen);
335 return cipher->setkey(tfm, key, keylen);
338 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
341 return alg->cra_ctxsize;
344 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
347 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
348 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
350 if (alg->ivsize > PAGE_SIZE / 8)
353 crt->setkey = setkey;
354 crt->encrypt = alg->encrypt;
355 crt->decrypt = alg->decrypt;
356 crt->base = __crypto_ablkcipher_cast(tfm);
357 crt->ivsize = alg->ivsize;
363 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
365 struct crypto_report_blkcipher rblkcipher;
367 strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
368 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
369 sizeof(rblkcipher.geniv));
370 rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';
372 rblkcipher.blocksize = alg->cra_blocksize;
373 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
374 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
375 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
377 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
378 sizeof(struct crypto_report_blkcipher), &rblkcipher))
379 goto nla_put_failure;
386 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
392 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
393 __attribute__ ((unused));
394 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
396 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
398 seq_printf(m, "type : ablkcipher\n");
399 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
401 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
402 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
403 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
404 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
405 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
408 const struct crypto_type crypto_ablkcipher_type = {
409 .ctxsize = crypto_ablkcipher_ctxsize,
410 .init = crypto_init_ablkcipher_ops,
411 #ifdef CONFIG_PROC_FS
412 .show = crypto_ablkcipher_show,
414 .report = crypto_ablkcipher_report,
416 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
418 static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
421 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
422 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
424 if (alg->ivsize > PAGE_SIZE / 8)
427 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
428 alg->setkey : setkey;
429 crt->encrypt = alg->encrypt;
430 crt->decrypt = alg->decrypt;
431 crt->base = __crypto_ablkcipher_cast(tfm);
432 crt->ivsize = alg->ivsize;
438 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
440 struct crypto_report_blkcipher rblkcipher;
442 strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
443 strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
444 sizeof(rblkcipher.geniv));
445 rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';
447 rblkcipher.blocksize = alg->cra_blocksize;
448 rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
449 rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
450 rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
452 if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
453 sizeof(struct crypto_report_blkcipher), &rblkcipher))
454 goto nla_put_failure;
461 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
467 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
468 __attribute__ ((unused));
469 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
471 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
473 seq_printf(m, "type : givcipher\n");
474 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
476 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
477 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
478 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
479 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
480 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
483 const struct crypto_type crypto_givcipher_type = {
484 .ctxsize = crypto_ablkcipher_ctxsize,
485 .init = crypto_init_givcipher_ops,
486 #ifdef CONFIG_PROC_FS
487 .show = crypto_givcipher_show,
489 .report = crypto_givcipher_report,
491 EXPORT_SYMBOL_GPL(crypto_givcipher_type);