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crypto: x86/glue_helper - add skcipher_walk functions 

Add ECB, CBC, and CTR functions to glue_helper which use skcipher_walk
rather than blkcipher_walk.  This will allow converting the remaining
x86 algorithms from the blkcipher interface over to the skcipher
interface, after which we'll be able to remove the blkcipher_walk
versions of these functions.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2018-02-19 23:48:00 -08:00 committed by Herbert Xu
parent d14f0a1fc4
commit f15f2a2542
2 changed files with 219 additions and 0 deletions
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207
arch/x86/crypto/glue_helper.c
View File

@ -90,6 +90,52 @@ int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
}
EXPORT_SYMBOL_GPL(glue_ecb_crypt_128bit);
int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req)
{
void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
const unsigned int bsize = 128 / 8;
struct skcipher_walk walk;
bool fpu_enabled = false;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes)) {
const u8 *src = walk.src.virt.addr;
u8 *dst = walk.dst.virt.addr;
unsigned int func_bytes;
unsigned int i;
fpu_enabled = glue_skwalk_fpu_begin(bsize,
gctx->fpu_blocks_limit,
&walk, fpu_enabled, nbytes);
for (i = 0; i < gctx->num_funcs; i++) {
func_bytes = bsize * gctx->funcs[i].num_blocks;
if (nbytes < func_bytes)
continue;
/* Process multi-block batch */
do {
gctx->funcs[i].fn_u.ecb(ctx, dst, src);
src += func_bytes;
dst += func_bytes;
nbytes -= func_bytes;
} while (nbytes >= func_bytes);
if (nbytes < bsize)
break;
}
err = skcipher_walk_done(&walk, nbytes);
}
glue_fpu_end(fpu_enabled);
return err;
}
EXPORT_SYMBOL_GPL(glue_ecb_req_128bit);
static unsigned int __glue_cbc_encrypt_128bit(const common_glue_func_t fn,
struct blkcipher_desc *desc,
struct blkcipher_walk *walk)
@ -135,6 +181,38 @@ int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
}
EXPORT_SYMBOL_GPL(glue_cbc_encrypt_128bit);
int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
struct skcipher_request *req)
{
void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
const unsigned int bsize = 128 / 8;
struct skcipher_walk walk;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes)) {
const u128 *src = (u128 *)walk.src.virt.addr;
u128 *dst = (u128 *)walk.dst.virt.addr;
u128 *iv = (u128 *)walk.iv;
do {
u128_xor(dst, src, iv);
fn(ctx, (u8 *)dst, (u8 *)dst);
iv = dst;
src++;
dst++;
nbytes -= bsize;
} while (nbytes >= bsize);
*(u128 *)walk.iv = *iv;
err = skcipher_walk_done(&walk, nbytes);
}
return err;
}
EXPORT_SYMBOL_GPL(glue_cbc_encrypt_req_128bit);
static unsigned int
__glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
struct blkcipher_desc *desc,
@ -211,6 +289,67 @@ int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
}
EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit);
int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req)
{
void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
const unsigned int bsize = 128 / 8;
struct skcipher_walk walk;
bool fpu_enabled = false;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes)) {
const u128 *src = walk.src.virt.addr;
u128 *dst = walk.dst.virt.addr;
unsigned int func_bytes, num_blocks;
unsigned int i;
u128 last_iv;
fpu_enabled = glue_skwalk_fpu_begin(bsize,
gctx->fpu_blocks_limit,
&walk, fpu_enabled, nbytes);
/* Start of the last block. */
src += nbytes / bsize - 1;
dst += nbytes / bsize - 1;
last_iv = *src;
for (i = 0; i < gctx->num_funcs; i++) {
num_blocks = gctx->funcs[i].num_blocks;
func_bytes = bsize * num_blocks;
if (nbytes < func_bytes)
continue;
/* Process multi-block batch */
do {
src -= num_blocks - 1;
dst -= num_blocks - 1;
gctx->funcs[i].fn_u.cbc(ctx, dst, src);
nbytes -= func_bytes;
if (nbytes < bsize)
goto done;
u128_xor(dst, dst, --src);
dst--;
} while (nbytes >= func_bytes);
}
done:
u128_xor(dst, dst, (u128 *)walk.iv);
*(u128 *)walk.iv = last_iv;
err = skcipher_walk_done(&walk, nbytes);
}
glue_fpu_end(fpu_enabled);
return err;
}
EXPORT_SYMBOL_GPL(glue_cbc_decrypt_req_128bit);
static void glue_ctr_crypt_final_128bit(const common_glue_ctr_func_t fn_ctr,
struct blkcipher_desc *desc,
struct blkcipher_walk *walk)
@ -301,6 +440,74 @@ int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
}
EXPORT_SYMBOL_GPL(glue_ctr_crypt_128bit);
int glue_ctr_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req)
{
void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
const unsigned int bsize = 128 / 8;
struct skcipher_walk walk;
bool fpu_enabled = false;
unsigned int nbytes;
int err;
err = skcipher_walk_virt(&walk, req, false);
while ((nbytes = walk.nbytes) >= bsize) {
const u128 *src = walk.src.virt.addr;
u128 *dst = walk.dst.virt.addr;
unsigned int func_bytes, num_blocks;
unsigned int i;
le128 ctrblk;
fpu_enabled = glue_skwalk_fpu_begin(bsize,
gctx->fpu_blocks_limit,
&walk, fpu_enabled, nbytes);
be128_to_le128(&ctrblk, (be128 *)walk.iv);
for (i = 0; i < gctx->num_funcs; i++) {
num_blocks = gctx->funcs[i].num_blocks;
func_bytes = bsize * num_blocks;
if (nbytes < func_bytes)
continue;
/* Process multi-block batch */
do {
gctx->funcs[i].fn_u.ctr(ctx, dst, src, &ctrblk);
src += num_blocks;
dst += num_blocks;
nbytes -= func_bytes;
} while (nbytes >= func_bytes);
if (nbytes < bsize)
break;
}
le128_to_be128((be128 *)walk.iv, &ctrblk);
err = skcipher_walk_done(&walk, nbytes);
}
glue_fpu_end(fpu_enabled);
if (nbytes) {
le128 ctrblk;
u128 tmp;
be128_to_le128(&ctrblk, (be128 *)walk.iv);
memcpy(&tmp, walk.src.virt.addr, nbytes);
gctx->funcs[gctx->num_funcs - 1].fn_u.ctr(ctx, &tmp, &tmp,
&ctrblk);
memcpy(walk.dst.virt.addr, &tmp, nbytes);
le128_to_be128((be128 *)walk.iv, &ctrblk);
err = skcipher_walk_done(&walk, 0);
}
return err;
}
EXPORT_SYMBOL_GPL(glue_ctr_req_128bit);
static unsigned int __glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
void *ctx,
struct blkcipher_desc *desc,

12
arch/x86/include/asm/crypto/glue_helper.h
View File

@ -131,23 +131,35 @@ extern int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes);
extern int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
extern int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes);
extern int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
struct skcipher_request *req);
extern int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes);
extern int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
extern int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes);
extern int glue_ctr_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
extern int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
struct blkcipher_desc *desc,
struct scatterlist *dst,