[PATCH v5 3/5] crypto: arm64/aes-ce - stop using SIMD helper for skciphers
Ard Biesheuvel
ardb at kernel.org
Fri May 21 03:20:51 PDT 2021
Calls into the skcipher API can only occur from contexts where the SIMD
unit is available, so there is no need for the SIMD helper.
Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
---
arch/arm64/crypto/Kconfig | 4 -
arch/arm64/crypto/aes-glue.c | 102 +++-----------------
2 files changed, 13 insertions(+), 93 deletions(-)
diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index ed1e8cadeb3a..454621a20eaa 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig
@@ -88,16 +88,12 @@ config CRYPTO_AES_ARM64_CE_BLK
depends on KERNEL_MODE_NEON
select CRYPTO_SKCIPHER
select CRYPTO_AES_ARM64_CE
- select CRYPTO_AES_ARM64
- select CRYPTO_SIMD
config CRYPTO_AES_ARM64_NEON_BLK
tristate "AES in ECB/CBC/CTR/XTS modes using NEON instructions"
depends on KERNEL_MODE_NEON
select CRYPTO_SKCIPHER
- select CRYPTO_AES_ARM64
select CRYPTO_LIB_AES
- select CRYPTO_SIMD
config CRYPTO_CHACHA20_NEON
tristate "ChaCha20, XChaCha20, and XChaCha12 stream ciphers using NEON instructions"
diff --git a/arch/arm64/crypto/aes-glue.c b/arch/arm64/crypto/aes-glue.c
index 17e735931a0c..30b7cc6a7079 100644
--- a/arch/arm64/crypto/aes-glue.c
+++ b/arch/arm64/crypto/aes-glue.c
@@ -444,7 +444,7 @@ static int __maybe_unused essiv_cbc_decrypt(struct skcipher_request *req)
return err ?: cbc_decrypt_walk(req, &walk);
}
-static int ctr_encrypt(struct skcipher_request *req)
+static int __maybe_unused ctr_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
@@ -485,29 +485,6 @@ static int ctr_encrypt(struct skcipher_request *req)
return err;
}
-static void ctr_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst)
-{
- const struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
- unsigned long flags;
-
- /*
- * Temporarily disable interrupts to avoid races where
- * cachelines are evicted when the CPU is interrupted
- * to do something else.
- */
- local_irq_save(flags);
- aes_encrypt(ctx, dst, src);
- local_irq_restore(flags);
-}
-
-static int __maybe_unused ctr_encrypt_sync(struct skcipher_request *req)
-{
- if (!crypto_simd_usable())
- return crypto_ctr_encrypt_walk(req, ctr_encrypt_one);
-
- return ctr_encrypt(req);
-}
-
static int __maybe_unused xts_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
@@ -656,10 +633,9 @@ static int __maybe_unused xts_decrypt(struct skcipher_request *req)
static struct skcipher_alg aes_algs[] = { {
#if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS)
.base = {
- .cra_name = "__ecb(aes)",
- .cra_driver_name = "__ecb-aes-" MODE,
+ .cra_name = "ecb(aes)",
+ .cra_driver_name = "ecb-aes-" MODE,
.cra_priority = PRIO,
- .cra_flags = CRYPTO_ALG_INTERNAL,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_module = THIS_MODULE,
@@ -671,10 +647,9 @@ static struct skcipher_alg aes_algs[] = { {
.decrypt = ecb_decrypt,
}, {
.base = {
- .cra_name = "__cbc(aes)",
- .cra_driver_name = "__cbc-aes-" MODE,
+ .cra_name = "cbc(aes)",
+ .cra_driver_name = "cbc-aes-" MODE,
.cra_priority = PRIO,
- .cra_flags = CRYPTO_ALG_INTERNAL,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_module = THIS_MODULE,
@@ -687,10 +662,9 @@ static struct skcipher_alg aes_algs[] = { {
.decrypt = cbc_decrypt,
}, {
.base = {
- .cra_name = "__ctr(aes)",
- .cra_driver_name = "__ctr-aes-" MODE,
+ .cra_name = "ctr(aes)",
+ .cra_driver_name = "ctr-aes-" MODE,
.cra_priority = PRIO,
- .cra_flags = CRYPTO_ALG_INTERNAL,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_module = THIS_MODULE,
@@ -704,26 +678,9 @@ static struct skcipher_alg aes_algs[] = { {
.decrypt = ctr_encrypt,
}, {
.base = {
- .cra_name = "ctr(aes)",
- .cra_driver_name = "ctr-aes-" MODE,
- .cra_priority = PRIO - 1,
- .cra_blocksize = 1,
- .cra_ctxsize = sizeof(struct crypto_aes_ctx),
- .cra_module = THIS_MODULE,
- },
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
- .ivsize = AES_BLOCK_SIZE,
- .chunksize = AES_BLOCK_SIZE,
- .setkey = skcipher_aes_setkey,
- .encrypt = ctr_encrypt_sync,
- .decrypt = ctr_encrypt_sync,
-}, {
- .base = {
- .cra_name = "__xts(aes)",
- .cra_driver_name = "__xts-aes-" MODE,
+ .cra_name = "xts(aes)",
+ .cra_driver_name = "xts-aes-" MODE,
.cra_priority = PRIO,
- .cra_flags = CRYPTO_ALG_INTERNAL,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
.cra_module = THIS_MODULE,
@@ -738,10 +695,9 @@ static struct skcipher_alg aes_algs[] = { {
}, {
#endif
.base = {
- .cra_name = "__cts(cbc(aes))",
- .cra_driver_name = "__cts-cbc-aes-" MODE,
+ .cra_name = "cts(cbc(aes))",
+ .cra_driver_name = "cts-cbc-aes-" MODE,
.cra_priority = PRIO,
- .cra_flags = CRYPTO_ALG_INTERNAL,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_module = THIS_MODULE,
@@ -755,10 +711,9 @@ static struct skcipher_alg aes_algs[] = { {
.decrypt = cts_cbc_decrypt,
}, {
.base = {
- .cra_name = "__essiv(cbc(aes),sha256)",
- .cra_driver_name = "__essiv-cbc-aes-sha256-" MODE,
+ .cra_name = "essiv(cbc(aes),sha256)",
+ .cra_driver_name = "essiv-cbc-aes-sha256-" MODE,
.cra_priority = PRIO + 1,
- .cra_flags = CRYPTO_ALG_INTERNAL,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_essiv_cbc_ctx),
.cra_module = THIS_MODULE,
@@ -997,28 +952,15 @@ static struct shash_alg mac_algs[] = { {
.descsize = sizeof(struct mac_desc_ctx),
} };
-static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];
-
static void aes_exit(void)
{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++)
- if (aes_simd_algs[i])
- simd_skcipher_free(aes_simd_algs[i]);
-
crypto_unregister_shashes(mac_algs, ARRAY_SIZE(mac_algs));
crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
}
static int __init aes_init(void)
{
- struct simd_skcipher_alg *simd;
- const char *basename;
- const char *algname;
- const char *drvname;
int err;
- int i;
err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
if (err)
@@ -1028,26 +970,8 @@ static int __init aes_init(void)
if (err)
goto unregister_ciphers;
- for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
- if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL))
- continue;
-
- algname = aes_algs[i].base.cra_name + 2;
- drvname = aes_algs[i].base.cra_driver_name + 2;
- basename = aes_algs[i].base.cra_driver_name;
- simd = simd_skcipher_create_compat(algname, drvname, basename);
- err = PTR_ERR(simd);
- if (IS_ERR(simd))
- goto unregister_simds;
-
- aes_simd_algs[i] = simd;
- }
-
return 0;
-unregister_simds:
- aes_exit();
- return err;
unregister_ciphers:
crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
return err;
--
2.20.1
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