From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: linux-crypto@vger.kernel.org
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Eric Biggers <ebiggers@google.com>,
dm-devel@redhat.com, linux-fscrypt@vger.kernel.org,
Gilad Ben-Yossef <gilad@benyossef.com>,
Milan Broz <gmazyland@gmail.com>
Subject: [PATCH v9 5/7] crypto: arm64/aes-cts-cbc - factor out CBC en/decryption of a walk
Date: Sat, 10 Aug 2019 12:40:51 +0300 [thread overview]
Message-ID: <20190810094053.7423-6-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <20190810094053.7423-1-ard.biesheuvel@linaro.org>
The plain CBC driver and the CTS one share some code that iterates over
a scatterwalk and invokes the CBC asm code to do the processing. The
upcoming ESSIV/CBC mode will clone that pattern for the third time, so
let's factor it out first.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
arch/arm64/crypto/aes-glue.c | 82 ++++++++++----------
1 file changed, 40 insertions(+), 42 deletions(-)
diff --git a/arch/arm64/crypto/aes-glue.c b/arch/arm64/crypto/aes-glue.c
index 55d6d4838708..23abf335f1ee 100644
--- a/arch/arm64/crypto/aes-glue.c
+++ b/arch/arm64/crypto/aes-glue.c
@@ -186,46 +186,64 @@ static int ecb_decrypt(struct skcipher_request *req)
return err;
}
-static int cbc_encrypt(struct skcipher_request *req)
+static int cbc_encrypt_walk(struct skcipher_request *req,
+ struct skcipher_walk *walk)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
- int err, rounds = 6 + ctx->key_length / 4;
- struct skcipher_walk walk;
+ int err = 0, rounds = 6 + ctx->key_length / 4;
unsigned int blocks;
- err = skcipher_walk_virt(&walk, req, false);
-
- while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
+ while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) {
kernel_neon_begin();
- aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
- ctx->key_enc, rounds, blocks, walk.iv);
+ aes_cbc_encrypt(walk->dst.virt.addr, walk->src.virt.addr,
+ ctx->key_enc, rounds, blocks, walk->iv);
kernel_neon_end();
- err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
+ err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE);
}
return err;
}
-static int cbc_decrypt(struct skcipher_request *req)
+static int cbc_encrypt(struct skcipher_request *req)
{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
- int err, rounds = 6 + ctx->key_length / 4;
struct skcipher_walk walk;
- unsigned int blocks;
+ int err;
err = skcipher_walk_virt(&walk, req, false);
+ if (err)
+ return err;
+ return cbc_encrypt_walk(req, &walk);
+}
- while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
+static int cbc_decrypt_walk(struct skcipher_request *req,
+ struct skcipher_walk *walk)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
+ int err = 0, rounds = 6 + ctx->key_length / 4;
+ unsigned int blocks;
+
+ while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) {
kernel_neon_begin();
- aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
- ctx->key_dec, rounds, blocks, walk.iv);
+ aes_cbc_decrypt(walk->dst.virt.addr, walk->src.virt.addr,
+ ctx->key_dec, rounds, blocks, walk->iv);
kernel_neon_end();
- err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
+ err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE);
}
return err;
}
+static int cbc_decrypt(struct skcipher_request *req)
+{
+ struct skcipher_walk walk;
+ int err;
+
+ err = skcipher_walk_virt(&walk, req, false);
+ if (err)
+ return err;
+ return cbc_decrypt_walk(req, &walk);
+}
+
static int cts_cbc_init_tfm(struct crypto_skcipher *tfm)
{
crypto_skcipher_set_reqsize(tfm, sizeof(struct cts_cbc_req_ctx));
@@ -251,22 +269,12 @@ static int cts_cbc_encrypt(struct skcipher_request *req)
}
if (cbc_blocks > 0) {
- unsigned int blocks;
-
skcipher_request_set_crypt(&rctx->subreq, req->src, req->dst,
cbc_blocks * AES_BLOCK_SIZE,
req->iv);
- err = skcipher_walk_virt(&walk, &rctx->subreq, false);
-
- while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
- kernel_neon_begin();
- aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
- ctx->key_enc, rounds, blocks, walk.iv);
- kernel_neon_end();
- err = skcipher_walk_done(&walk,
- walk.nbytes % AES_BLOCK_SIZE);
- }
+ err = skcipher_walk_virt(&walk, &rctx->subreq, false) ?:
+ cbc_encrypt_walk(&rctx->subreq, &walk);
if (err)
return err;
@@ -316,22 +324,12 @@ static int cts_cbc_decrypt(struct skcipher_request *req)
}
if (cbc_blocks > 0) {
- unsigned int blocks;
-
skcipher_request_set_crypt(&rctx->subreq, req->src, req->dst,
cbc_blocks * AES_BLOCK_SIZE,
req->iv);
- err = skcipher_walk_virt(&walk, &rctx->subreq, false);
-
- while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
- kernel_neon_begin();
- aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
- ctx->key_dec, rounds, blocks, walk.iv);
- kernel_neon_end();
- err = skcipher_walk_done(&walk,
- walk.nbytes % AES_BLOCK_SIZE);
- }
+ err = skcipher_walk_virt(&walk, &rctx->subreq, false) ?:
+ cbc_decrypt_walk(&rctx->subreq, &walk);
if (err)
return err;
--
2.17.1
next prev parent reply other threads:[~2019-08-10 9:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-10 9:40 [PATCH v9 0/7] crypto: switch to crypto API for ESSIV generation Ard Biesheuvel
2019-08-10 9:40 ` [PATCH v9 1/7] crypto: essiv - create wrapper template " Ard Biesheuvel
2019-08-10 9:40 ` [PATCH v9 2/7] fs: crypto: invoke crypto API for ESSIV handling Ard Biesheuvel
2019-08-10 9:40 ` [PATCH v9 3/7] md: dm-crypt: switch to ESSIV crypto API template Ard Biesheuvel
2019-08-12 6:33 ` Milan Broz
2019-08-12 6:54 ` Ard Biesheuvel
2019-08-12 7:44 ` Milan Broz
2019-08-12 7:50 ` Ard Biesheuvel
2019-08-12 13:51 ` Milan Broz
2019-08-12 14:19 ` Ard Biesheuvel
2019-08-10 9:40 ` [PATCH v9 4/7] crypto: essiv - add tests for essiv in cbc(aes)+sha256 mode Ard Biesheuvel
2019-08-10 9:40 ` Ard Biesheuvel [this message]
2019-08-10 9:40 ` [PATCH v9 6/7] crypto: arm64/aes - implement accelerated ESSIV/CBC mode Ard Biesheuvel
2019-08-10 9:40 ` [PATCH v9 7/7] md: dm-crypt: omit parsing of the encapsulated cipher Ard Biesheuvel
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