#include <linux/crypto.h>
#include <linux/errno.h>
+#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
scatterwalk_unmap(walk->dst.virt.addr, 1);
}
+/* 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)
{
- if (offset_in_page(start + len) < len)
- return (u8 *)((unsigned long)(start + len) & PAGE_MASK);
- return start;
+ u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
+ return max(start, end_page);
}
static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm,
static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
unsigned int n)
{
- n = walk->nbytes - n;
-
if (walk->flags & BLKCIPHER_WALK_COPY) {
blkcipher_map_dst(walk);
memcpy(walk->dst.virt.addr, walk->page, n);
unsigned int nbytes = 0;
if (likely(err >= 0)) {
- unsigned int bsize = crypto_blkcipher_blocksize(tfm);
- unsigned int n;
+ unsigned int n = walk->nbytes - err;
if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
- n = blkcipher_done_fast(walk, err);
- else
- n = blkcipher_done_slow(tfm, walk, bsize);
+ n = blkcipher_done_fast(walk, n);
+ else if (WARN_ON(err)) {
+ err = -EINVAL;
+ goto err;
+ } else
+ n = blkcipher_done_slow(tfm, walk, n);
nbytes = walk->total - n;
err = 0;
return blkcipher_walk_next(desc, walk);
}
+err:
if (walk->iv != desc->info)
memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm));
if (walk->buffer != walk->page)
unsigned int alignmask)
{
unsigned int n;
+ unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
if (walk->buffer)
goto ok;
if (walk->buffer)
goto ok;
- n = bsize * 2 + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
+ 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);
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 + bsize,
- 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);
{
struct crypto_blkcipher *tfm = desc->tfm;
unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
- unsigned int bsize = crypto_blkcipher_blocksize(tfm);
+ unsigned int bsize;
unsigned int n;
int err;
n = walk->total;
- if (unlikely(n < bsize)) {
+ if (unlikely(n < crypto_blkcipher_blocksize(tfm))) {
desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
return blkcipher_walk_done(desc, walk, -EINVAL);
}
}
}
+ bsize = min(walk->blocksize, n);
n = scatterwalk_clamp(&walk->in, n);
n = scatterwalk_clamp(&walk->out, n);
struct crypto_blkcipher *tfm,
unsigned int alignmask)
{
- unsigned bs = crypto_blkcipher_blocksize(tfm);
+ unsigned bs = walk->blocksize;
unsigned int ivsize = crypto_blkcipher_ivsize(tfm);
- unsigned int size = bs * 2 + ivsize + max(bs, ivsize) - (alignmask + 1);
+ 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);
return -ENOMEM;
iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
- iv = blkcipher_get_spot(iv, bs) + bs;
- iv = blkcipher_get_spot(iv, bs) + bs;
+ iv = blkcipher_get_spot(iv, bs) + aligned_bs;
+ iv = blkcipher_get_spot(iv, bs) + aligned_bs;
iv = blkcipher_get_spot(iv, ivsize);
walk->iv = memcpy(iv, walk->iv, ivsize);
struct blkcipher_walk *walk)
{
walk->flags &= ~BLKCIPHER_WALK_PHYS;
+ walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
return blkcipher_walk_first(desc, walk);
}
EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
struct blkcipher_walk *walk)
{
walk->flags |= BLKCIPHER_WALK_PHYS;
+ walk->blocksize = crypto_blkcipher_blocksize(desc->tfm);
return blkcipher_walk_first(desc, walk);
}
EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
struct crypto_blkcipher *tfm = desc->tfm;
unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
+ if (WARN_ON_ONCE(in_irq()))
+ return -EDEADLK;
+
walk->nbytes = walk->total;
if (unlikely(!walk->total))
return 0;
return blkcipher_walk_next(desc, walk);
}
-static int setkey(struct crypto_tfm *tfm, const u8 *key,
- unsigned int keylen)
+int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
+ struct blkcipher_walk *walk,
+ unsigned int blocksize)
+{
+ walk->flags &= ~BLKCIPHER_WALK_PHYS;
+ walk->blocksize = blocksize;
+ return blkcipher_walk_first(desc, walk);
+}
+EXPORT_SYMBOL_GPL(blkcipher_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 unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg)
+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 (cipher->ivsize) {
+ type ^= CRYPTO_ALG_ASYNC;
+ mask &= CRYPTO_ALG_ASYNC;
+ if ((type & mask) && cipher->ivsize) {
len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
len += cipher->ivsize;
}
return len;
}
-static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm)
+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->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;
- if (alg->ivsize > PAGE_SIZE / 8)
- return -EINVAL;
-
crt->setkey = setkey;
crt->encrypt = alg->encrypt;
crt->decrypt = alg->decrypt;
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;
+
+ type ^= CRYPTO_ALG_ASYNC;
+ mask &= CRYPTO_ALG_ASYNC;
+ if (type & mask)
+ return crypto_init_blkcipher_ops_sync(tfm);
+ else
+ return crypto_init_blkcipher_ops_async(tfm);
+}
+
static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
- __attribute_used__;
+ __attribute__ ((unused));
static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
seq_printf(m, "type : blkcipher\n");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff