From: Ard Biesheuvel <ardb@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org, ebiggers@kernel.org,
herbert@gondor.apana.org.au, will@kernel.org,
kernel-team@android.com, Ard Biesheuvel <ardb@kernel.org>,
Eric Biggers <ebiggers@google.com>
Subject: [PATCH v6 1/6] crypto: arm64/gcm-aes-ce - remove non-SIMD fallback path
Date: Wed, 26 May 2021 12:07:24 +0200 [thread overview]
Message-ID: <20210526100729.12939-2-ardb@kernel.org> (raw)
In-Reply-To: <20210526100729.12939-1-ardb@kernel.org>
Now that kernel mode SIMD is guaranteed to be available when executing
in task or softirq context, we no longer need scalar fallbacks to use
when the NEON is unavailable. So get rid of them.
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm64/crypto/ghash-ce-glue.c | 209 +++++---------------
1 file changed, 51 insertions(+), 158 deletions(-)
diff --git a/arch/arm64/crypto/ghash-ce-glue.c b/arch/arm64/crypto/ghash-ce-glue.c
index 720cd3a58da3..15794fe21a0b 100644
--- a/arch/arm64/crypto/ghash-ce-glue.c
+++ b/arch/arm64/crypto/ghash-ce-glue.c
@@ -362,84 +362,36 @@ static int gcm_encrypt(struct aead_request *req)
err = skcipher_walk_aead_encrypt(&walk, req, false);
- if (likely(crypto_simd_usable())) {
- do {
- const u8 *src = walk.src.virt.addr;
- u8 *dst = walk.dst.virt.addr;
- int nbytes = walk.nbytes;
-
- tag = (u8 *)&lengths;
-
- if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE)) {
- src = dst = memcpy(buf + sizeof(buf) - nbytes,
- src, nbytes);
- } else if (nbytes < walk.total) {
- nbytes &= ~(AES_BLOCK_SIZE - 1);
- tag = NULL;
- }
-
- kernel_neon_begin();
- pmull_gcm_encrypt(nbytes, dst, src, ctx->ghash_key.h,
- dg, iv, ctx->aes_key.key_enc, nrounds,
- tag);
- kernel_neon_end();
-
- if (unlikely(!nbytes))
- break;
-
- if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE))
- memcpy(walk.dst.virt.addr,
- buf + sizeof(buf) - nbytes, nbytes);
-
- err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
- } while (walk.nbytes);
- } else {
- while (walk.nbytes >= AES_BLOCK_SIZE) {
- int blocks = walk.nbytes / AES_BLOCK_SIZE;
- const u8 *src = walk.src.virt.addr;
- u8 *dst = walk.dst.virt.addr;
- int remaining = blocks;
-
- do {
- aes_encrypt(&ctx->aes_key, buf, iv);
- crypto_xor_cpy(dst, src, buf, AES_BLOCK_SIZE);
- crypto_inc(iv, AES_BLOCK_SIZE);
-
- dst += AES_BLOCK_SIZE;
- src += AES_BLOCK_SIZE;
- } while (--remaining > 0);
-
- ghash_do_update(blocks, dg, walk.dst.virt.addr,
- &ctx->ghash_key, NULL);
-
- err = skcipher_walk_done(&walk,
- walk.nbytes % AES_BLOCK_SIZE);
- }
-
- /* handle the tail */
- if (walk.nbytes) {
- aes_encrypt(&ctx->aes_key, buf, iv);
+ do {
+ const u8 *src = walk.src.virt.addr;
+ u8 *dst = walk.dst.virt.addr;
+ int nbytes = walk.nbytes;
- crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr,
- buf, walk.nbytes);
+ tag = (u8 *)&lengths;
- memcpy(buf, walk.dst.virt.addr, walk.nbytes);
- memset(buf + walk.nbytes, 0, sizeof(buf) - walk.nbytes);
+ if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE)) {
+ src = dst = memcpy(buf + sizeof(buf) - nbytes,
+ src, nbytes);
+ } else if (nbytes < walk.total) {
+ nbytes &= ~(AES_BLOCK_SIZE - 1);
+ tag = NULL;
}
- tag = (u8 *)&lengths;
- ghash_do_update(1, dg, tag, &ctx->ghash_key,
- walk.nbytes ? buf : NULL);
+ kernel_neon_begin();
+ pmull_gcm_encrypt(nbytes, dst, src, ctx->ghash_key.h,
+ dg, iv, ctx->aes_key.key_enc, nrounds,
+ tag);
+ kernel_neon_end();
- if (walk.nbytes)
- err = skcipher_walk_done(&walk, 0);
+ if (unlikely(!nbytes))
+ break;
- put_unaligned_be64(dg[1], tag);
- put_unaligned_be64(dg[0], tag + 8);
- put_unaligned_be32(1, iv + GCM_IV_SIZE);
- aes_encrypt(&ctx->aes_key, iv, iv);
- crypto_xor(tag, iv, AES_BLOCK_SIZE);
- }
+ if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE))
+ memcpy(walk.dst.virt.addr,
+ buf + sizeof(buf) - nbytes, nbytes);
+
+ err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
+ } while (walk.nbytes);
if (err)
return err;
@@ -464,6 +416,7 @@ static int gcm_decrypt(struct aead_request *req)
u64 dg[2] = {};
be128 lengths;
u8 *tag;
+ int ret;
int err;
lengths.a = cpu_to_be64(req->assoclen * 8);
@@ -481,101 +434,41 @@ static int gcm_decrypt(struct aead_request *req)
err = skcipher_walk_aead_decrypt(&walk, req, false);
- if (likely(crypto_simd_usable())) {
- int ret;
-
- do {
- const u8 *src = walk.src.virt.addr;
- u8 *dst = walk.dst.virt.addr;
- int nbytes = walk.nbytes;
-
- tag = (u8 *)&lengths;
-
- if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE)) {
- src = dst = memcpy(buf + sizeof(buf) - nbytes,
- src, nbytes);
- } else if (nbytes < walk.total) {
- nbytes &= ~(AES_BLOCK_SIZE - 1);
- tag = NULL;
- }
-
- kernel_neon_begin();
- ret = pmull_gcm_decrypt(nbytes, dst, src,
- ctx->ghash_key.h,
- dg, iv, ctx->aes_key.key_enc,
- nrounds, tag, otag, authsize);
- kernel_neon_end();
-
- if (unlikely(!nbytes))
- break;
-
- if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE))
- memcpy(walk.dst.virt.addr,
- buf + sizeof(buf) - nbytes, nbytes);
-
- err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
- } while (walk.nbytes);
-
- if (err)
- return err;
- if (ret)
- return -EBADMSG;
- } else {
- while (walk.nbytes >= AES_BLOCK_SIZE) {
- int blocks = walk.nbytes / AES_BLOCK_SIZE;
- const u8 *src = walk.src.virt.addr;
- u8 *dst = walk.dst.virt.addr;
-
- ghash_do_update(blocks, dg, walk.src.virt.addr,
- &ctx->ghash_key, NULL);
-
- do {
- aes_encrypt(&ctx->aes_key, buf, iv);
- crypto_xor_cpy(dst, src, buf, AES_BLOCK_SIZE);
- crypto_inc(iv, AES_BLOCK_SIZE);
-
- dst += AES_BLOCK_SIZE;
- src += AES_BLOCK_SIZE;
- } while (--blocks > 0);
+ do {
+ const u8 *src = walk.src.virt.addr;
+ u8 *dst = walk.dst.virt.addr;
+ int nbytes = walk.nbytes;
- err = skcipher_walk_done(&walk,
- walk.nbytes % AES_BLOCK_SIZE);
- }
+ tag = (u8 *)&lengths;
- /* handle the tail */
- if (walk.nbytes) {
- memcpy(buf, walk.src.virt.addr, walk.nbytes);
- memset(buf + walk.nbytes, 0, sizeof(buf) - walk.nbytes);
+ if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE)) {
+ src = dst = memcpy(buf + sizeof(buf) - nbytes,
+ src, nbytes);
+ } else if (nbytes < walk.total) {
+ nbytes &= ~(AES_BLOCK_SIZE - 1);
+ tag = NULL;
}
- tag = (u8 *)&lengths;
- ghash_do_update(1, dg, tag, &ctx->ghash_key,
- walk.nbytes ? buf : NULL);
-
- if (walk.nbytes) {
- aes_encrypt(&ctx->aes_key, buf, iv);
+ kernel_neon_begin();
+ ret = pmull_gcm_decrypt(nbytes, dst, src, ctx->ghash_key.h,
+ dg, iv, ctx->aes_key.key_enc,
+ nrounds, tag, otag, authsize);
+ kernel_neon_end();
- crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr,
- buf, walk.nbytes);
+ if (unlikely(!nbytes))
+ break;
- err = skcipher_walk_done(&walk, 0);
- }
+ if (unlikely(nbytes > 0 && nbytes < AES_BLOCK_SIZE))
+ memcpy(walk.dst.virt.addr,
+ buf + sizeof(buf) - nbytes, nbytes);
- if (err)
- return err;
+ err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
+ } while (walk.nbytes);
- put_unaligned_be64(dg[1], tag);
- put_unaligned_be64(dg[0], tag + 8);
- put_unaligned_be32(1, iv + GCM_IV_SIZE);
- aes_encrypt(&ctx->aes_key, iv, iv);
- crypto_xor(tag, iv, AES_BLOCK_SIZE);
+ if (err)
+ return err;
- if (crypto_memneq(tag, otag, authsize)) {
- memzero_explicit(tag, AES_BLOCK_SIZE);
- return -EBADMSG;
- }
- }
- return 0;
+ return ret ? -EBADMSG : 0;
}
static struct aead_alg gcm_aes_alg = {
--
2.20.1
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next prev parent reply other threads:[~2021-05-26 12:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-26 10:07 [PATCH v6 0/6] running kernel mode SIMD with softirqs disabled Ard Biesheuvel
2021-05-26 10:07 ` Ard Biesheuvel [this message]
2021-05-26 10:07 ` [PATCH v6 2/6] crypto: arm64/aes-neonbs - stop using SIMD helper for skciphers Ard Biesheuvel
2021-05-26 10:07 ` [PATCH v6 3/6] crypto: arm64/aes-ce " Ard Biesheuvel
2021-05-26 10:07 ` [PATCH v6 4/6] crypto: arm64/aes-ccm - remove non-SIMD fallback path Ard Biesheuvel
2021-05-26 16:57 ` Eric Biggers
2021-05-26 10:07 ` [PATCH v6 5/6] crypto: arm64/aes-ccm - reduce NEON begin/end calls for common case Ard Biesheuvel
2021-05-26 17:14 ` Eric Biggers
2021-05-26 18:08 ` Ard Biesheuvel
2021-05-26 10:07 ` [PATCH v6 6/6] crypto: arm64/aes-ccm - avoid by-ref argument for ce_aes_ccm_auth_data Ard Biesheuvel
2021-05-26 17:18 ` Eric Biggers
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