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crypto/blkcipher.c
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/* * Block chaining cipher operations. * * Generic encrypt/decrypt wrapper for ciphers, handles operations across * multiple page boundaries by using temporary blocks. In user context, * the kernel is given a chance to schedule us once per page. * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ |
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#include <crypto/aead.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/errno.h> |
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#include <linux/hardirq.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/seq_file.h> #include <linux/slab.h> #include <linux/string.h> |
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#include <linux/cryptouser.h> #include <net/netlink.h> |
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#include "internal.h" |
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enum { BLKCIPHER_WALK_PHYS = 1 << 0, BLKCIPHER_WALK_SLOW = 1 << 1, BLKCIPHER_WALK_COPY = 1 << 2, BLKCIPHER_WALK_DIFF = 1 << 3, }; static int blkcipher_walk_next(struct blkcipher_desc *desc, struct blkcipher_walk *walk); static int blkcipher_walk_first(struct blkcipher_desc *desc, struct blkcipher_walk *walk); static inline void blkcipher_map_src(struct blkcipher_walk *walk) { |
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walk->src.virt.addr = scatterwalk_map(&walk->in); |
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} static inline void blkcipher_map_dst(struct blkcipher_walk *walk) { |
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walk->dst.virt.addr = scatterwalk_map(&walk->out); |
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} static inline void blkcipher_unmap_src(struct blkcipher_walk *walk) { |
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scatterwalk_unmap(walk->src.virt.addr); |
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} static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk) { |
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scatterwalk_unmap(walk->dst.virt.addr); |
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} |
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/* 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. */ |
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static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len) { |
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u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
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return max(start, end_page); |
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} |
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static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk, |
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unsigned int bsize) { u8 *addr; |
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|
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addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); |
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addr = blkcipher_get_spot(addr, bsize); scatterwalk_copychunks(addr, &walk->out, bsize, 1); return bsize; } static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk, unsigned int n) { |
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if (walk->flags & BLKCIPHER_WALK_COPY) { blkcipher_map_dst(walk); memcpy(walk->dst.virt.addr, walk->page, n); blkcipher_unmap_dst(walk); } else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) { |
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if (walk->flags & BLKCIPHER_WALK_DIFF) blkcipher_unmap_dst(walk); |
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blkcipher_unmap_src(walk); |
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} scatterwalk_advance(&walk->in, n); scatterwalk_advance(&walk->out, n); return n; } int blkcipher_walk_done(struct blkcipher_desc *desc, struct blkcipher_walk *walk, int err) { |
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unsigned int nbytes = 0; if (likely(err >= 0)) { |
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unsigned int n = walk->nbytes - err; |
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if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW))) |
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n = blkcipher_done_fast(walk, n); else if (WARN_ON(err)) { err = -EINVAL; goto err; } else |
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n = blkcipher_done_slow(walk, n); |
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nbytes = walk->total - n; err = 0; } scatterwalk_done(&walk->in, 0, nbytes); scatterwalk_done(&walk->out, 1, nbytes); |
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err: |
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walk->total = nbytes; walk->nbytes = nbytes; if (nbytes) { crypto_yield(desc->flags); return blkcipher_walk_next(desc, walk); } if (walk->iv != desc->info) |
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memcpy(desc->info, walk->iv, walk->ivsize); |
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if (walk->buffer != walk->page) kfree(walk->buffer); if (walk->page) free_page((unsigned long)walk->page); return err; } EXPORT_SYMBOL_GPL(blkcipher_walk_done); static inline int blkcipher_next_slow(struct blkcipher_desc *desc, struct blkcipher_walk *walk, unsigned int bsize, unsigned int alignmask) { unsigned int n; |
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unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); |
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if (walk->buffer) goto ok; walk->buffer = walk->page; if (walk->buffer) goto ok; |
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n = aligned_bsize * 3 - (alignmask + 1) + |
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(alignmask & ~(crypto_tfm_ctx_alignment() - 1)); |
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walk->buffer = kmalloc(n, GFP_ATOMIC); if (!walk->buffer) return blkcipher_walk_done(desc, walk, -ENOMEM); ok: walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1); walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize); |
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walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + aligned_bsize, bsize); |
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scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); walk->nbytes = bsize; walk->flags |= BLKCIPHER_WALK_SLOW; return 0; } static inline int blkcipher_next_copy(struct blkcipher_walk *walk) { u8 *tmp = walk->page; blkcipher_map_src(walk); memcpy(tmp, walk->src.virt.addr, walk->nbytes); blkcipher_unmap_src(walk); walk->src.virt.addr = tmp; walk->dst.virt.addr = tmp; return 0; } static inline int blkcipher_next_fast(struct blkcipher_desc *desc, struct blkcipher_walk *walk) { unsigned long diff; walk->src.phys.page = scatterwalk_page(&walk->in); walk->src.phys.offset = offset_in_page(walk->in.offset); walk->dst.phys.page = scatterwalk_page(&walk->out); walk->dst.phys.offset = offset_in_page(walk->out.offset); if (walk->flags & BLKCIPHER_WALK_PHYS) return 0; diff = walk->src.phys.offset - walk->dst.phys.offset; diff |= walk->src.virt.page - walk->dst.virt.page; blkcipher_map_src(walk); walk->dst.virt.addr = walk->src.virt.addr; if (diff) { walk->flags |= BLKCIPHER_WALK_DIFF; blkcipher_map_dst(walk); } return 0; } static int blkcipher_walk_next(struct blkcipher_desc *desc, struct blkcipher_walk *walk) { |
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unsigned int bsize; |
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unsigned int n; int err; n = walk->total; |
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if (unlikely(n < walk->cipher_blocksize)) { |
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desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; return blkcipher_walk_done(desc, walk, -EINVAL); } |
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bsize = min(walk->walk_blocksize, n); |
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walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY | BLKCIPHER_WALK_DIFF); |
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if (!scatterwalk_aligned(&walk->in, walk->alignmask) || !scatterwalk_aligned(&walk->out, walk->alignmask)) { |
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walk->flags |= BLKCIPHER_WALK_COPY; if (!walk->page) { walk->page = (void *)__get_free_page(GFP_ATOMIC); if (!walk->page) n = 0; } } n = scatterwalk_clamp(&walk->in, n); n = scatterwalk_clamp(&walk->out, n); if (unlikely(n < bsize)) { |
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err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask); |
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goto set_phys_lowmem; } walk->nbytes = n; if (walk->flags & BLKCIPHER_WALK_COPY) { err = blkcipher_next_copy(walk); goto set_phys_lowmem; } return blkcipher_next_fast(desc, walk); set_phys_lowmem: if (walk->flags & BLKCIPHER_WALK_PHYS) { walk->src.phys.page = virt_to_page(walk->src.virt.addr); walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); walk->src.phys.offset &= PAGE_SIZE - 1; walk->dst.phys.offset &= PAGE_SIZE - 1; } return err; } |
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static inline int blkcipher_copy_iv(struct blkcipher_walk *walk) |
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{ |
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unsigned bs = walk->walk_blocksize; unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1); unsigned int size = aligned_bs * 2 + walk->ivsize + max(aligned_bs, walk->ivsize) - (walk->alignmask + 1); |
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u8 *iv; |
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size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1); |
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walk->buffer = kmalloc(size, GFP_ATOMIC); if (!walk->buffer) return -ENOMEM; |
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iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); |
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iv = blkcipher_get_spot(iv, bs) + aligned_bs; iv = blkcipher_get_spot(iv, bs) + aligned_bs; |
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iv = blkcipher_get_spot(iv, walk->ivsize); |
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|
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walk->iv = memcpy(iv, walk->iv, walk->ivsize); |
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return 0; } int blkcipher_walk_virt(struct blkcipher_desc *desc, struct blkcipher_walk *walk) { walk->flags &= ~BLKCIPHER_WALK_PHYS; |
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walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm); walk->cipher_blocksize = walk->walk_blocksize; walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); |
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return blkcipher_walk_first(desc, walk); } EXPORT_SYMBOL_GPL(blkcipher_walk_virt); int blkcipher_walk_phys(struct blkcipher_desc *desc, struct blkcipher_walk *walk) { walk->flags |= BLKCIPHER_WALK_PHYS; |
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walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm); walk->cipher_blocksize = walk->walk_blocksize; walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); |
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return blkcipher_walk_first(desc, walk); } EXPORT_SYMBOL_GPL(blkcipher_walk_phys); static int blkcipher_walk_first(struct blkcipher_desc *desc, struct blkcipher_walk *walk) { |
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if (WARN_ON_ONCE(in_irq())) return -EDEADLK; |
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walk->iv = desc->info; |
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walk->nbytes = walk->total; if (unlikely(!walk->total)) return 0; walk->buffer = NULL; |
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if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { int err = blkcipher_copy_iv(walk); |
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if (err) return err; } scatterwalk_start(&walk->in, walk->in.sg); scatterwalk_start(&walk->out, walk->out.sg); walk->page = NULL; return blkcipher_walk_next(desc, walk); } |
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int blkcipher_walk_virt_block(struct blkcipher_desc *desc, struct blkcipher_walk *walk, unsigned int blocksize) { walk->flags &= ~BLKCIPHER_WALK_PHYS; |
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walk->walk_blocksize = blocksize; walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm); walk->ivsize = crypto_blkcipher_ivsize(desc->tfm); walk->alignmask = crypto_blkcipher_alignmask(desc->tfm); |
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return blkcipher_walk_first(desc, walk); } EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block); |
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int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc, struct blkcipher_walk *walk, struct crypto_aead *tfm, unsigned int blocksize) { walk->flags &= ~BLKCIPHER_WALK_PHYS; walk->walk_blocksize = blocksize; walk->cipher_blocksize = crypto_aead_blocksize(tfm); walk->ivsize = crypto_aead_ivsize(tfm); walk->alignmask = crypto_aead_alignmask(tfm); return blkcipher_walk_first(desc, walk); } EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block); |
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static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
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{ struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; unsigned long alignmask = crypto_tfm_alg_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); |
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memset(alignbuffer, 0, keylen); |
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kfree(buffer); return ret; } |
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static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
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{ struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher; |
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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm); |
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if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; return -EINVAL; } |
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if ((unsigned long)key & alignmask) return setkey_unaligned(tfm, key, keylen); |
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return cipher->setkey(tfm, key, keylen); } |
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static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen) { return setkey(crypto_ablkcipher_tfm(tfm), key, keylen); } static int async_encrypt(struct ablkcipher_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; struct blkcipher_desc desc = { .tfm = __crypto_blkcipher_cast(tfm), .info = req->info, .flags = req->base.flags, }; return alg->encrypt(&desc, req->dst, req->src, req->nbytes); } static int async_decrypt(struct ablkcipher_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; struct blkcipher_desc desc = { .tfm = __crypto_blkcipher_cast(tfm), .info = req->info, .flags = req->base.flags, }; return alg->decrypt(&desc, req->dst, req->src, req->nbytes); } |
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static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) |
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{ struct blkcipher_alg *cipher = &alg->cra_blkcipher; unsigned int len = alg->cra_ctxsize; |
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if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK && cipher->ivsize) { |
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len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); len += cipher->ivsize; } return len; } |
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static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm) { struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; crt->setkey = async_setkey; crt->encrypt = async_encrypt; crt->decrypt = async_decrypt; |
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crt->base = __crypto_ablkcipher_cast(tfm); |
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crt->ivsize = alg->ivsize; return 0; } static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm) |
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{ struct blkcipher_tfm *crt = &tfm->crt_blkcipher; struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1; unsigned long addr; |
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crt->setkey = setkey; crt->encrypt = alg->encrypt; crt->decrypt = alg->decrypt; addr = (unsigned long)crypto_tfm_ctx(tfm); addr = ALIGN(addr, align); addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align); crt->iv = (void *)addr; return 0; } |
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static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) { struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher; if (alg->ivsize > PAGE_SIZE / 8) return -EINVAL; |
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if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK) |
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return crypto_init_blkcipher_ops_sync(tfm); else return crypto_init_blkcipher_ops_async(tfm); } |
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#ifdef CONFIG_NET |
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static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_blkcipher rblkcipher; |
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strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type)); strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>", sizeof(rblkcipher.geniv)); |
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rblkcipher.blocksize = alg->cra_blocksize; rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize; rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize; rblkcipher.ivsize = alg->cra_blkcipher.ivsize; |
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if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, sizeof(struct crypto_report_blkcipher), &rblkcipher)) goto nla_put_failure; |
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return 0; nla_put_failure: return -EMSGSIZE; } |
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#else static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) { return -ENOSYS; } #endif |
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|
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static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
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__attribute__ ((unused)); |
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static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg) { seq_printf(m, "type : blkcipher "); seq_printf(m, "blocksize : %u ", alg->cra_blocksize); seq_printf(m, "min keysize : %u ", alg->cra_blkcipher.min_keysize); seq_printf(m, "max keysize : %u ", alg->cra_blkcipher.max_keysize); seq_printf(m, "ivsize : %u ", alg->cra_blkcipher.ivsize); |
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seq_printf(m, "geniv : %s ", alg->cra_blkcipher.geniv ?: "<default>"); |
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} const struct crypto_type crypto_blkcipher_type = { .ctxsize = crypto_blkcipher_ctxsize, .init = crypto_init_blkcipher_ops, #ifdef CONFIG_PROC_FS .show = crypto_blkcipher_show, #endif |
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.report = crypto_blkcipher_report, |
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}; EXPORT_SYMBOL_GPL(crypto_blkcipher_type); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Generic block chaining cipher type"); |