As it stands chacha cannot do chaining. That is, it has to handle
each request as a whole. This patch adds support for chaining when
the CRYPTO_TFM_REQ_MORE flag is set.
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
---
arch/arm/crypto/chacha-glue.c | 48 ++++++++++++++++++++++++++++--------------
1 file changed, 32 insertions(+), 16 deletions(-)
diff --git a/arch/arm/crypto/chacha-glue.c b/arch/arm/crypto/chacha-glue.c
index 59da6c0b63b62..7f753fc54137a 100644
--- a/arch/arm/crypto/chacha-glue.c
+++ b/arch/arm/crypto/chacha-glue.c
@@ -7,10 +7,8 @@
* Copyright (C) 2015 Martin Willi
*/
-#include <crypto/algapi.h>
#include <crypto/internal/chacha.h>
#include <crypto/internal/simd.h>
-#include <crypto/internal/skcipher.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -106,16 +104,16 @@ void chacha_crypt_arch(u32 *state, u8 *dst, const u8
*src, unsigned int bytes,
EXPORT_SYMBOL(chacha_crypt_arch);
static int chacha_stream_xor(struct skcipher_request *req,
- const struct chacha_ctx *ctx, const u8 *iv,
- bool neon)
+ int nrounds, bool neon)
{
+ struct chacha_reqctx *rctx = skcipher_request_ctx(req);
struct skcipher_walk walk;
- u32 state[16];
+ u32 *state = rctx->state;
int err;
- err = skcipher_walk_virt(&walk, req, false);
+ rctx->init = req->base.flags & CRYPTO_TFM_REQ_MORE;
- chacha_init_generic(state, ctx->key, iv);
+ err = skcipher_walk_virt(&walk, req, false);
while (walk.nbytes > 0) {
unsigned int nbytes = walk.nbytes;
@@ -125,12 +123,12 @@ static int chacha_stream_xor(struct skcipher_request *req,
if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
chacha_doarm(walk.dst.virt.addr, walk.src.virt.addr,
- nbytes, state, ctx->nrounds);
+ nbytes, state, nrounds);
state[12] += DIV_ROUND_UP(nbytes, CHACHA_BLOCK_SIZE);
} else {
kernel_neon_begin();
chacha_doneon(state, walk.dst.virt.addr,
- walk.src.virt.addr, nbytes, ctx->nrounds);
+ walk.src.virt.addr, nbytes, nrounds);
kernel_neon_end();
}
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
@@ -142,9 +140,13 @@ static int chacha_stream_xor(struct skcipher_request *req,
static int do_chacha(struct skcipher_request *req, bool neon)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct chacha_reqctx *rctx = skcipher_request_ctx(req);
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
- return chacha_stream_xor(req, ctx, req->iv, neon);
+ if (!rctx->init)
+ chacha_init_generic(rctx->state, ctx->key, req->iv);
+
+ return chacha_stream_xor(req, ctx->nrounds, neon);
}
static int chacha_arm(struct skcipher_request *req)
@@ -160,25 +162,33 @@ static int chacha_neon(struct skcipher_request *req)
static int do_xchacha(struct skcipher_request *req, bool neon)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct chacha_reqctx *rctx = skcipher_request_ctx(req);
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct chacha_ctx subctx;
- u32 state[16];
+ int nrounds = ctx->nrounds;
+ u32 *state = rctx->state;
u8 real_iv[16];
+ u32 key[8];
+
+ if (rctx->init)
+ goto skip_init;
chacha_init_generic(state, ctx->key, req->iv);
if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
- hchacha_block_arm(state, subctx.key, ctx->nrounds);
+ hchacha_block_arm(state, key, nrounds);
} else {
kernel_neon_begin();
- hchacha_block_neon(state, subctx.key, ctx->nrounds);
+ hchacha_block_neon(state, key, nrounds);
kernel_neon_end();
}
- subctx.nrounds = ctx->nrounds;
memcpy(&real_iv[0], req->iv + 24, 8);
memcpy(&real_iv[8], req->iv + 16, 8);
- return chacha_stream_xor(req, &subctx, real_iv, neon);
+
+ chacha_init_generic(state, key, real_iv);
+
+skip_init:
+ return chacha_stream_xor(req, nrounds, neon);
}
static int xchacha_arm(struct skcipher_request *req)
@@ -204,6 +214,7 @@ static struct skcipher_alg arm_algs[] = {
.max_keysize = CHACHA_KEY_SIZE,
.ivsize = CHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
+ .reqsize = sizeof(struct chacha_reqctx),
.setkey = chacha20_setkey,
.encrypt = chacha_arm,
.decrypt = chacha_arm,
@@ -219,6 +230,7 @@ static struct skcipher_alg arm_algs[] = {
.max_keysize = CHACHA_KEY_SIZE,
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
+ .reqsize = sizeof(struct chacha_reqctx),
.setkey = chacha20_setkey,
.encrypt = xchacha_arm,
.decrypt = xchacha_arm,
@@ -234,6 +246,7 @@ static struct skcipher_alg arm_algs[] = {
.max_keysize = CHACHA_KEY_SIZE,
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
+ .reqsize = sizeof(struct chacha_reqctx),
.setkey = chacha12_setkey,
.encrypt = xchacha_arm,
.decrypt = xchacha_arm,
@@ -254,6 +267,7 @@ static struct skcipher_alg neon_algs[] = {
.ivsize = CHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.walksize = 4 * CHACHA_BLOCK_SIZE,
+ .reqsize = sizeof(struct chacha_reqctx),
.setkey = chacha20_setkey,
.encrypt = chacha_neon,
.decrypt = chacha_neon,
@@ -270,6 +284,7 @@ static struct skcipher_alg neon_algs[] = {
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.walksize = 4 * CHACHA_BLOCK_SIZE,
+ .reqsize = sizeof(struct chacha_reqctx),
.setkey = chacha20_setkey,
.encrypt = xchacha_neon,
.decrypt = xchacha_neon,
@@ -286,6 +301,7 @@ static struct skcipher_alg neon_algs[] = {
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.walksize = 4 * CHACHA_BLOCK_SIZE,
+ .reqsize = sizeof(struct chacha_reqctx),
.setkey = chacha12_setkey,
.encrypt = xchacha_neon,
.decrypt = xchacha_neon,
