diff options
Diffstat (limited to 'crypto/ablkcipher.c')
| -rw-r--r-- | crypto/ablkcipher.c | 407 |
1 files changed, 0 insertions, 407 deletions
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c deleted file mode 100644 index 072b5646a0a3..000000000000 --- a/crypto/ablkcipher.c +++ /dev/null @@ -1,407 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Asynchronous block chaining cipher operations. - * - * This is the asynchronous version of blkcipher.c indicating completion - * via a callback. - * - * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> - */ - -#include <crypto/internal/skcipher.h> -#include <linux/err.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/seq_file.h> -#include <linux/cryptouser.h> -#include <linux/compiler.h> -#include <net/netlink.h> - -#include <crypto/scatterwalk.h> - -#include "internal.h" - -struct ablkcipher_buffer { - struct list_head entry; - struct scatter_walk dst; - unsigned int len; - void *data; -}; - -enum { - ABLKCIPHER_WALK_SLOW = 1 << 0, -}; - -static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p) -{ - scatterwalk_copychunks(p->data, &p->dst, p->len, 1); -} - -void __ablkcipher_walk_complete(struct ablkcipher_walk *walk) -{ - struct ablkcipher_buffer *p, *tmp; - - list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { - ablkcipher_buffer_write(p); - list_del(&p->entry); - kfree(p); - } -} -EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete); - -static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk, - struct ablkcipher_buffer *p) -{ - p->dst = walk->out; - list_add_tail(&p->entry, &walk->buffers); -} - -/* Get a spot of the specified length that does not straddle a page. - * The caller needs to ensure that there is enough space for this operation. - */ -static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len) -{ - u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); - - return max(start, end_page); -} - -static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk, - unsigned int n) -{ - for (;;) { - unsigned int len_this_page = scatterwalk_pagelen(&walk->out); - - if (len_this_page > n) - len_this_page = n; - scatterwalk_advance(&walk->out, n); - if (n == len_this_page) - break; - n -= len_this_page; - scatterwalk_start(&walk->out, sg_next(walk->out.sg)); - } -} - -static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk, - unsigned int n) -{ - scatterwalk_advance(&walk->in, n); - scatterwalk_advance(&walk->out, n); -} - -static int ablkcipher_walk_next(struct ablkcipher_request *req, - struct ablkcipher_walk *walk); - -int ablkcipher_walk_done(struct ablkcipher_request *req, - struct ablkcipher_walk *walk, int err) -{ - struct crypto_tfm *tfm = req->base.tfm; - unsigned int n; /* bytes processed */ - bool more; - - if (unlikely(err < 0)) - goto finish; - - n = walk->nbytes - err; - walk->total -= n; - more = (walk->total != 0); - - if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) { - ablkcipher_done_fast(walk, n); - } else { - if (WARN_ON(err)) { - /* unexpected case; didn't process all bytes */ - err = -EINVAL; - goto finish; - } - ablkcipher_done_slow(walk, n); - } - - scatterwalk_done(&walk->in, 0, more); - scatterwalk_done(&walk->out, 1, more); - - if (more) { - crypto_yield(req->base.flags); - return ablkcipher_walk_next(req, walk); - } - err = 0; -finish: - walk->nbytes = 0; - if (walk->iv != req->info) - memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize); - kfree(walk->iv_buffer); - return err; -} -EXPORT_SYMBOL_GPL(ablkcipher_walk_done); - -static inline int ablkcipher_next_slow(struct ablkcipher_request *req, - struct ablkcipher_walk *walk, - unsigned int bsize, - unsigned int alignmask, - void **src_p, void **dst_p) -{ - unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); - struct ablkcipher_buffer *p; - void *src, *dst, *base; - unsigned int n; - - n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1); - n += (aligned_bsize * 3 - (alignmask + 1) + - (alignmask & ~(crypto_tfm_ctx_alignment() - 1))); - - p = kmalloc(n, GFP_ATOMIC); - if (!p) - return ablkcipher_walk_done(req, walk, -ENOMEM); - - base = p + 1; - - dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1); - src = dst = ablkcipher_get_spot(dst, bsize); - - p->len = bsize; - p->data = dst; - - scatterwalk_copychunks(src, &walk->in, bsize, 0); - - ablkcipher_queue_write(walk, p); - - walk->nbytes = bsize; - walk->flags |= ABLKCIPHER_WALK_SLOW; - - *src_p = src; - *dst_p = dst; - - return 0; -} - -static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk, - struct crypto_tfm *tfm, - unsigned int alignmask) -{ - unsigned bs = walk->blocksize; - unsigned int ivsize = tfm->crt_ablkcipher.ivsize; - unsigned aligned_bs = ALIGN(bs, alignmask + 1); - unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - - (alignmask + 1); - u8 *iv; - - size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); - walk->iv_buffer = kmalloc(size, GFP_ATOMIC); - if (!walk->iv_buffer) - return -ENOMEM; - - iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1); - iv = ablkcipher_get_spot(iv, bs) + aligned_bs; - iv = ablkcipher_get_spot(iv, bs) + aligned_bs; - iv = ablkcipher_get_spot(iv, ivsize); - - walk->iv = memcpy(iv, walk->iv, ivsize); - return 0; -} - -static inline int ablkcipher_next_fast(struct ablkcipher_request *req, - struct ablkcipher_walk *walk) -{ - walk->src.page = scatterwalk_page(&walk->in); - walk->src.offset = offset_in_page(walk->in.offset); - walk->dst.page = scatterwalk_page(&walk->out); - walk->dst.offset = offset_in_page(walk->out.offset); - - return 0; -} - -static int ablkcipher_walk_next(struct ablkcipher_request *req, - struct ablkcipher_walk *walk) -{ - struct crypto_tfm *tfm = req->base.tfm; - unsigned int alignmask, bsize, n; - void *src, *dst; - int err; - - alignmask = crypto_tfm_alg_alignmask(tfm); - n = walk->total; - if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) { - req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; - return ablkcipher_walk_done(req, walk, -EINVAL); - } - - walk->flags &= ~ABLKCIPHER_WALK_SLOW; - src = dst = NULL; - - bsize = min(walk->blocksize, n); - n = scatterwalk_clamp(&walk->in, n); - n = scatterwalk_clamp(&walk->out, n); - - if (n < bsize || - !scatterwalk_aligned(&walk->in, alignmask) || - !scatterwalk_aligned(&walk->out, alignmask)) { - err = ablkcipher_next_slow(req, walk, bsize, alignmask, - &src, &dst); - goto set_phys_lowmem; - } - - walk->nbytes = n; - - return ablkcipher_next_fast(req, walk); - -set_phys_lowmem: - if (err >= 0) { - walk->src.page = virt_to_page(src); - walk->dst.page = virt_to_page(dst); - walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1)); - walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1)); - } - - return err; -} - -static int ablkcipher_walk_first(struct ablkcipher_request *req, - struct ablkcipher_walk *walk) -{ - struct crypto_tfm *tfm = req->base.tfm; - unsigned int alignmask; - - alignmask = crypto_tfm_alg_alignmask(tfm); - if (WARN_ON_ONCE(in_irq())) - return -EDEADLK; - - walk->iv = req->info; - walk->nbytes = walk->total; - if (unlikely(!walk->total)) - return 0; - - walk->iv_buffer = NULL; - if (unlikely(((unsigned long)walk->iv & alignmask))) { - int err = ablkcipher_copy_iv(walk, tfm, alignmask); - - if (err) - return err; - } - - scatterwalk_start(&walk->in, walk->in.sg); - scatterwalk_start(&walk->out, walk->out.sg); - - return ablkcipher_walk_next(req, walk); -} - -int ablkcipher_walk_phys(struct ablkcipher_request *req, - struct ablkcipher_walk *walk) -{ - walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm); - return ablkcipher_walk_first(req, walk); -} -EXPORT_SYMBOL_GPL(ablkcipher_walk_phys); - -static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, - unsigned int keylen) -{ - struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); - unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); - int ret; - u8 *buffer, *alignbuffer; - unsigned long absize; - - absize = keylen + alignmask; - buffer = kmalloc(absize, GFP_ATOMIC); - if (!buffer) - return -ENOMEM; - - alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); - memcpy(alignbuffer, key, keylen); - ret = cipher->setkey(tfm, alignbuffer, keylen); - memset(alignbuffer, 0, keylen); - kfree(buffer); - return ret; -} - -static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, - unsigned int keylen) -{ - struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); - unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); - - if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { - crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); - return -EINVAL; - } - - if ((unsigned long)key & alignmask) - return setkey_unaligned(tfm, key, keylen); - - return cipher->setkey(tfm, key, keylen); -} - -static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, - u32 mask) -{ - return alg->cra_ctxsize; -} - -static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, - u32 mask) -{ - struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; - struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; - - if (alg->ivsize > PAGE_SIZE / 8) - return -EINVAL; - - crt->setkey = setkey; - crt->encrypt = alg->encrypt; - crt->decrypt = alg->decrypt; - crt->base = __crypto_ablkcipher_cast(tfm); - crt->ivsize = alg->ivsize; - - return 0; -} - -#ifdef CONFIG_NET -static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) -{ - struct crypto_report_blkcipher rblkcipher; - - memset(&rblkcipher, 0, sizeof(rblkcipher)); - - strscpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type)); - strscpy(rblkcipher.geniv, "<default>", sizeof(rblkcipher.geniv)); - - rblkcipher.blocksize = alg->cra_blocksize; - rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; - rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; - rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; - - return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, - sizeof(rblkcipher), &rblkcipher); -} -#else -static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) -{ - return -ENOSYS; -} -#endif - -static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) - __maybe_unused; -static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) -{ - struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; - - seq_printf(m, "type : ablkcipher\n"); - seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? - "yes" : "no"); - seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); - seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); - seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); - seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); - seq_printf(m, "geniv : <default>\n"); -} - -const struct crypto_type crypto_ablkcipher_type = { - .ctxsize = crypto_ablkcipher_ctxsize, - .init = crypto_init_ablkcipher_ops, -#ifdef CONFIG_PROC_FS - .show = crypto_ablkcipher_show, -#endif - .report = crypto_ablkcipher_report, -}; -EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); |