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-rw-r--r--crypto/blkcipher.c548
1 files changed, 0 insertions, 548 deletions
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
deleted file mode 100644
index 48a33817de11..000000000000
--- a/crypto/blkcipher.c
+++ /dev/null
@@ -1,548 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * 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>
- */
-
-#include <crypto/aead.h>
-#include <crypto/internal/skcipher.h>
-#include <crypto/scatterwalk.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/cryptouser.h>
-#include <linux/compiler.h>
-#include <net/netlink.h>
-
-#include "internal.h"
-
-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)
-{
- walk->src.virt.addr = scatterwalk_map(&walk->in);
-}
-
-static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
-{
- walk->dst.virt.addr = scatterwalk_map(&walk->out);
-}
-
-static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
-{
- scatterwalk_unmap(walk->src.virt.addr);
-}
-
-static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
-{
- scatterwalk_unmap(walk->dst.virt.addr);
-}
-
-/* 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 *blkcipher_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 blkcipher_done_slow(struct blkcipher_walk *walk,
- unsigned int bsize)
-{
- u8 *addr;
-
- addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
- addr = blkcipher_get_spot(addr, bsize);
- scatterwalk_copychunks(addr, &walk->out, bsize, 1);
-}
-
-static inline void blkcipher_done_fast(struct blkcipher_walk *walk,
- unsigned int n)
-{
- 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)) {
- if (walk->flags & BLKCIPHER_WALK_DIFF)
- blkcipher_unmap_dst(walk);
- blkcipher_unmap_src(walk);
- }
-
- scatterwalk_advance(&walk->in, n);
- scatterwalk_advance(&walk->out, n);
-}
-
-int blkcipher_walk_done(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk, int err)
-{
- 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 & BLKCIPHER_WALK_SLOW))) {
- blkcipher_done_fast(walk, n);
- } else {
- if (WARN_ON(err)) {
- /* unexpected case; didn't process all bytes */
- err = -EINVAL;
- goto finish;
- }
- blkcipher_done_slow(walk, n);
- }
-
- scatterwalk_done(&walk->in, 0, more);
- scatterwalk_done(&walk->out, 1, more);
-
- if (more) {
- crypto_yield(desc->flags);
- return blkcipher_walk_next(desc, walk);
- }
- err = 0;
-finish:
- walk->nbytes = 0;
- if (walk->iv != desc->info)
- memcpy(desc->info, walk->iv, walk->ivsize);
- 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;
- unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
-
- if (walk->buffer)
- goto ok;
-
- walk->buffer = walk->page;
- if (walk->buffer)
- goto ok;
-
- n = aligned_bsize * 3 - (alignmask + 1) +
- (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
- 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);
- walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
- aligned_bsize, bsize);
-
- 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)
-{
- unsigned int bsize;
- unsigned int n;
- int err;
-
- n = walk->total;
- if (unlikely(n < walk->cipher_blocksize)) {
- desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
- return blkcipher_walk_done(desc, walk, -EINVAL);
- }
-
- bsize = min(walk->walk_blocksize, n);
-
- walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
- BLKCIPHER_WALK_DIFF);
- if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
- !scatterwalk_aligned(&walk->out, walk->alignmask)) {
- 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)) {
- err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
- 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;
-}
-
-static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
-{
- 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);
- u8 *iv;
-
- size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1);
- walk->buffer = kmalloc(size, GFP_ATOMIC);
- if (!walk->buffer)
- return -ENOMEM;
-
- iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
- iv = blkcipher_get_spot(iv, bs) + aligned_bs;
- iv = blkcipher_get_spot(iv, bs) + aligned_bs;
- iv = blkcipher_get_spot(iv, walk->ivsize);
-
- walk->iv = memcpy(iv, walk->iv, walk->ivsize);
- return 0;
-}
-
-int blkcipher_walk_virt(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk)
-{
- walk->flags &= ~BLKCIPHER_WALK_PHYS;
- 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);
- 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;
- 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);
- 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)
-{
- if (WARN_ON_ONCE(in_irq()))
- return -EDEADLK;
-
- walk->iv = desc->info;
- walk->nbytes = walk->total;
- if (unlikely(!walk->total))
- return 0;
-
- walk->buffer = NULL;
- if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
- int err = blkcipher_copy_iv(walk);
- 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);
-}
-
-int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
- struct blkcipher_walk *walk,
- unsigned int blocksize)
-{
- walk->flags &= ~BLKCIPHER_WALK_PHYS;
- 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);
- return blkcipher_walk_first(desc, walk);
-}
-EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
-
-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);
-
-static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
- unsigned int keylen)
-{
- 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);
- memset(alignbuffer, 0, keylen);
- kfree(buffer);
- return ret;
-}
-
-static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
-{
- struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
-
- if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
- tfm->crt_flags |= 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 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);
-}
-
-static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
- u32 mask)
-{
- struct blkcipher_alg *cipher = &alg->cra_blkcipher;
- unsigned int len = alg->cra_ctxsize;
-
- if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
- cipher->ivsize) {
- len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
- len += cipher->ivsize;
- }
-
- return len;
-}
-
-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;
- crt->base = __crypto_ablkcipher_cast(tfm);
- crt->ivsize = alg->ivsize;
-
- return 0;
-}
-
-static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
-{
- 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;
-
- 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;
-}
-
-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;
-
- if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
- return crypto_init_blkcipher_ops_sync(tfm);
- else
- return crypto_init_blkcipher_ops_async(tfm);
-}
-
-#ifdef CONFIG_NET
-static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
-{
- struct crypto_report_blkcipher rblkcipher;
-
- memset(&rblkcipher, 0, sizeof(rblkcipher));
-
- strscpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
- strscpy(rblkcipher.geniv, "<default>", sizeof(rblkcipher.geniv));
-
- 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;
-
- return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
- sizeof(rblkcipher), &rblkcipher);
-}
-#else
-static int crypto_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
-{
- return -ENOSYS;
-}
-#endif
-
-static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
- __maybe_unused;
-static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
-{
- seq_printf(m, "type : blkcipher\n");
- seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
- seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
- seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
- seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
- seq_printf(m, "geniv : <default>\n");
-}
-
-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
- .report = crypto_blkcipher_report,
-};
-EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Generic block chaining cipher type");