From: Eric Biggers <ebiggers@kernel.org>
To: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
"Jason A . Donenfeld" <Jason@zx2c4.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
x86@kernel.org, linux-riscv@lists.infradead.org,
Eric Biggers <ebiggers@kernel.org>
Subject: [PATCH 09/20] crypto: x86/aes-cbc - Remove superseded CBC skciphers
Date: Sun, 20 Sep 2026 22:08:55 -0700 [thread overview]
Message-ID: <20260921050910.296144-10-ebiggers@kernel.org> (raw)
In-Reply-To: <20260921050910.296144-1-ebiggers@kernel.org>
Now that the AES-CBC (and AES-CBC-CTS) library functions are optimized
with dedicated AES-NI code and exposed via the skcipher API via
crypto/aes.c, the similar implementation in aesni-intel is redundant.
Remove it.
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
---
arch/x86/crypto/Kconfig | 4 +-
arch/x86/crypto/aesni-intel_asm.S | 255 -----------------------------
arch/x86/crypto/aesni-intel_glue.c | 200 +---------------------
3 files changed, 5 insertions(+), 454 deletions(-)
diff --git a/arch/x86/crypto/Kconfig b/arch/x86/crypto/Kconfig
index ecd4931557a3..6dbf5e083966 100644
--- a/arch/x86/crypto/Kconfig
+++ b/arch/x86/crypto/Kconfig
@@ -3,14 +3,14 @@
menu "Accelerated Cryptographic Algorithms for CPU (x86)"
config CRYPTO_AES_NI_INTEL
- tristate "Ciphers: AES, modes: CBC, CTS, CTR, XCTR, XTS, GCM (AES-NI/VAES)"
+ tristate "Ciphers: AES, modes: CTR, XCTR, XTS, GCM (AES-NI/VAES)"
select CRYPTO_AEAD
select CRYPTO_LIB_AES
select CRYPTO_LIB_GF128MUL
select CRYPTO_SKCIPHER
help
AEAD cipher: AES with GCM
- Length-preserving ciphers: AES with CBC, CTS, CTR, XCTR, XTS
+ Length-preserving ciphers: AES with CTR, XCTR, XTS
Architecture: x86 (32-bit and 64-bit) using:
- AES-NI (AES new instructions)
diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S
index db7f259ee8ab..16c406781b24 100644
--- a/arch/x86/crypto/aesni-intel_asm.S
+++ b/arch/x86/crypto/aesni-intel_asm.S
@@ -601,261 +601,6 @@ SYM_FUNC_START_LOCAL(_aesni_dec4)
RET
SYM_FUNC_END(_aesni_dec4)
-/*
- * void aesni_cbc_enc(struct crypto_aes_ctx *ctx, const u8 *dst, u8 *src,
- * size_t len, u8 *iv)
- */
-SYM_FUNC_START(aesni_cbc_enc)
- FRAME_BEGIN
-#ifndef __x86_64__
- pushl IVP
- pushl LEN
- pushl KEYP
- pushl KLEN
- movl (FRAME_OFFSET+20)(%esp), KEYP # ctx
- movl (FRAME_OFFSET+24)(%esp), OUTP # dst
- movl (FRAME_OFFSET+28)(%esp), INP # src
- movl (FRAME_OFFSET+32)(%esp), LEN # len
- movl (FRAME_OFFSET+36)(%esp), IVP # iv
-#endif
- cmp $16, LEN
- jb .Lcbc_enc_ret
- mov 480(KEYP), KLEN
- movups (IVP), STATE # load iv as initial state
-.align 4
-.Lcbc_enc_loop:
- movups (INP), IN # load input
- pxor IN, STATE
- call _aesni_enc1
- movups STATE, (OUTP) # store output
- sub $16, LEN
- add $16, INP
- add $16, OUTP
- cmp $16, LEN
- jge .Lcbc_enc_loop
- movups STATE, (IVP)
-.Lcbc_enc_ret:
-#ifndef __x86_64__
- popl KLEN
- popl KEYP
- popl LEN
- popl IVP
-#endif
- FRAME_END
- RET
-SYM_FUNC_END(aesni_cbc_enc)
-
-/*
- * void aesni_cbc_dec(struct crypto_aes_ctx *ctx, const u8 *dst, u8 *src,
- * size_t len, u8 *iv)
- */
-SYM_FUNC_START(aesni_cbc_dec)
- FRAME_BEGIN
-#ifndef __x86_64__
- pushl IVP
- pushl LEN
- pushl KEYP
- pushl KLEN
- movl (FRAME_OFFSET+20)(%esp), KEYP # ctx
- movl (FRAME_OFFSET+24)(%esp), OUTP # dst
- movl (FRAME_OFFSET+28)(%esp), INP # src
- movl (FRAME_OFFSET+32)(%esp), LEN # len
- movl (FRAME_OFFSET+36)(%esp), IVP # iv
-#endif
- cmp $16, LEN
- jb .Lcbc_dec_just_ret
- mov 480(KEYP), KLEN
- add $240, KEYP
- movups (IVP), IV
- cmp $64, LEN
- jb .Lcbc_dec_loop1
-.align 4
-.Lcbc_dec_loop4:
- movups (INP), IN1
- movaps IN1, STATE1
- movups 0x10(INP), IN2
- movaps IN2, STATE2
-#ifdef __x86_64__
- movups 0x20(INP), IN3
- movaps IN3, STATE3
- movups 0x30(INP), IN4
- movaps IN4, STATE4
-#else
- movups 0x20(INP), IN1
- movaps IN1, STATE3
- movups 0x30(INP), IN2
- movaps IN2, STATE4
-#endif
- call _aesni_dec4
- pxor IV, STATE1
-#ifdef __x86_64__
- pxor IN1, STATE2
- pxor IN2, STATE3
- pxor IN3, STATE4
- movaps IN4, IV
-#else
- pxor IN1, STATE4
- movaps IN2, IV
- movups (INP), IN1
- pxor IN1, STATE2
- movups 0x10(INP), IN2
- pxor IN2, STATE3
-#endif
- movups STATE1, (OUTP)
- movups STATE2, 0x10(OUTP)
- movups STATE3, 0x20(OUTP)
- movups STATE4, 0x30(OUTP)
- sub $64, LEN
- add $64, INP
- add $64, OUTP
- cmp $64, LEN
- jge .Lcbc_dec_loop4
- cmp $16, LEN
- jb .Lcbc_dec_ret
-.align 4
-.Lcbc_dec_loop1:
- movups (INP), IN
- movaps IN, STATE
- call _aesni_dec1
- pxor IV, STATE
- movups STATE, (OUTP)
- movaps IN, IV
- sub $16, LEN
- add $16, INP
- add $16, OUTP
- cmp $16, LEN
- jge .Lcbc_dec_loop1
-.Lcbc_dec_ret:
- movups IV, (IVP)
-.Lcbc_dec_just_ret:
-#ifndef __x86_64__
- popl KLEN
- popl KEYP
- popl LEN
- popl IVP
-#endif
- FRAME_END
- RET
-SYM_FUNC_END(aesni_cbc_dec)
-
-/*
- * void aesni_cts_cbc_enc(struct crypto_aes_ctx *ctx, const u8 *dst, u8 *src,
- * size_t len, u8 *iv)
- */
-SYM_FUNC_START(aesni_cts_cbc_enc)
- FRAME_BEGIN
-#ifndef __x86_64__
- pushl IVP
- pushl LEN
- pushl KEYP
- pushl KLEN
- movl (FRAME_OFFSET+20)(%esp), KEYP # ctx
- movl (FRAME_OFFSET+24)(%esp), OUTP # dst
- movl (FRAME_OFFSET+28)(%esp), INP # src
- movl (FRAME_OFFSET+32)(%esp), LEN # len
- movl (FRAME_OFFSET+36)(%esp), IVP # iv
- lea .Lcts_permute_table, T1
-#else
- lea .Lcts_permute_table(%rip), T1
-#endif
- mov 480(KEYP), KLEN
- movups (IVP), STATE
- sub $16, LEN
- mov T1, IVP
- add $32, IVP
- add LEN, T1
- sub LEN, IVP
- movups (T1), %xmm4
- movups (IVP), %xmm5
-
- movups (INP), IN1
- add LEN, INP
- movups (INP), IN2
-
- pxor IN1, STATE
- call _aesni_enc1
-
- pshufb %xmm5, IN2
- pxor STATE, IN2
- pshufb %xmm4, STATE
- add OUTP, LEN
- movups STATE, (LEN)
-
- movaps IN2, STATE
- call _aesni_enc1
- movups STATE, (OUTP)
-
-#ifndef __x86_64__
- popl KLEN
- popl KEYP
- popl LEN
- popl IVP
-#endif
- FRAME_END
- RET
-SYM_FUNC_END(aesni_cts_cbc_enc)
-
-/*
- * void aesni_cts_cbc_dec(struct crypto_aes_ctx *ctx, const u8 *dst, u8 *src,
- * size_t len, u8 *iv)
- */
-SYM_FUNC_START(aesni_cts_cbc_dec)
- FRAME_BEGIN
-#ifndef __x86_64__
- pushl IVP
- pushl LEN
- pushl KEYP
- pushl KLEN
- movl (FRAME_OFFSET+20)(%esp), KEYP # ctx
- movl (FRAME_OFFSET+24)(%esp), OUTP # dst
- movl (FRAME_OFFSET+28)(%esp), INP # src
- movl (FRAME_OFFSET+32)(%esp), LEN # len
- movl (FRAME_OFFSET+36)(%esp), IVP # iv
- lea .Lcts_permute_table, T1
-#else
- lea .Lcts_permute_table(%rip), T1
-#endif
- mov 480(KEYP), KLEN
- add $240, KEYP
- movups (IVP), IV
- sub $16, LEN
- mov T1, IVP
- add $32, IVP
- add LEN, T1
- sub LEN, IVP
- movups (T1), %xmm4
-
- movups (INP), STATE
- add LEN, INP
- movups (INP), IN1
-
- call _aesni_dec1
- movaps STATE, IN2
- pshufb %xmm4, STATE
- pxor IN1, STATE
-
- add OUTP, LEN
- movups STATE, (LEN)
-
- movups (IVP), %xmm0
- pshufb %xmm0, IN1
- pblendvb IN2, IN1
- movaps IN1, STATE
- call _aesni_dec1
-
- pxor IV, STATE
- movups STATE, (OUTP)
-
-#ifndef __x86_64__
- popl KLEN
- popl KEYP
- popl LEN
- popl IVP
-#endif
- FRAME_END
- RET
-SYM_FUNC_END(aesni_cts_cbc_dec)
-
.pushsection .rodata
.align 16
.Lcts_permute_table:
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index f3b9cfb0b813..00b74acd01bd 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -61,14 +61,6 @@ static inline void *aes_align_addr(void *addr)
asmlinkage void aesni_set_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
unsigned int key_len);
asmlinkage void aesni_enc(const void *ctx, u8 *out, const u8 *in);
-asmlinkage void aesni_cbc_enc(struct crypto_aes_ctx *ctx, u8 *out,
- const u8 *in, unsigned int len, u8 *iv);
-asmlinkage void aesni_cbc_dec(struct crypto_aes_ctx *ctx, u8 *out,
- const u8 *in, unsigned int len, u8 *iv);
-asmlinkage void aesni_cts_cbc_enc(struct crypto_aes_ctx *ctx, u8 *out,
- const u8 *in, unsigned int len, u8 *iv);
-asmlinkage void aesni_cts_cbc_dec(struct crypto_aes_ctx *ctx, u8 *out,
- const u8 *in, unsigned int len, u8 *iv);
asmlinkage void aesni_xts_enc(const struct crypto_aes_ctx *ctx, u8 *out,
const u8 *in, unsigned int len, u8 *iv);
@@ -115,162 +107,6 @@ static int aesni_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
return aes_set_key_common(aes_ctx(crypto_skcipher_ctx(tfm)), key, len);
}
-static int cbc_encrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm));
- struct skcipher_walk walk;
- unsigned int nbytes;
- int err;
-
- err = skcipher_walk_virt(&walk, req, false);
-
- while ((nbytes = walk.nbytes)) {
- kernel_fpu_begin();
- aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
- kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = skcipher_walk_done(&walk, nbytes);
- }
-
- return err;
-}
-
-static int cbc_decrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm));
- struct skcipher_walk walk;
- unsigned int nbytes;
- int err;
-
- err = skcipher_walk_virt(&walk, req, false);
-
- while ((nbytes = walk.nbytes)) {
- kernel_fpu_begin();
- aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes & AES_BLOCK_MASK, walk.iv);
- kernel_fpu_end();
- nbytes &= AES_BLOCK_SIZE - 1;
- err = skcipher_walk_done(&walk, nbytes);
- }
-
- return err;
-}
-
-static int cts_cbc_encrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm));
- int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2;
- struct scatterlist *src = req->src, *dst = req->dst;
- struct scatterlist sg_src[2], sg_dst[2];
- struct skcipher_request subreq;
- struct skcipher_walk walk;
- int err;
-
- skcipher_request_set_tfm(&subreq, tfm);
- skcipher_request_set_callback(&subreq, skcipher_request_flags(req),
- NULL, NULL);
-
- if (req->cryptlen <= AES_BLOCK_SIZE) {
- if (req->cryptlen < AES_BLOCK_SIZE)
- return -EINVAL;
- cbc_blocks = 1;
- }
-
- if (cbc_blocks > 0) {
- skcipher_request_set_crypt(&subreq, req->src, req->dst,
- cbc_blocks * AES_BLOCK_SIZE,
- req->iv);
-
- err = cbc_encrypt(&subreq);
- if (err)
- return err;
-
- if (req->cryptlen == AES_BLOCK_SIZE)
- return 0;
-
- dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen);
- if (req->dst != req->src)
- dst = scatterwalk_ffwd(sg_dst, req->dst,
- subreq.cryptlen);
- }
-
- /* handle ciphertext stealing */
- skcipher_request_set_crypt(&subreq, src, dst,
- req->cryptlen - cbc_blocks * AES_BLOCK_SIZE,
- req->iv);
-
- err = skcipher_walk_virt(&walk, &subreq, false);
- if (err)
- return err;
-
- kernel_fpu_begin();
- aesni_cts_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- walk.nbytes, walk.iv);
- kernel_fpu_end();
-
- return skcipher_walk_done(&walk, 0);
-}
-
-static int cts_cbc_decrypt(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct crypto_aes_ctx *ctx = aes_ctx(crypto_skcipher_ctx(tfm));
- int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2;
- struct scatterlist *src = req->src, *dst = req->dst;
- struct scatterlist sg_src[2], sg_dst[2];
- struct skcipher_request subreq;
- struct skcipher_walk walk;
- int err;
-
- skcipher_request_set_tfm(&subreq, tfm);
- skcipher_request_set_callback(&subreq, skcipher_request_flags(req),
- NULL, NULL);
-
- if (req->cryptlen <= AES_BLOCK_SIZE) {
- if (req->cryptlen < AES_BLOCK_SIZE)
- return -EINVAL;
- cbc_blocks = 1;
- }
-
- if (cbc_blocks > 0) {
- skcipher_request_set_crypt(&subreq, req->src, req->dst,
- cbc_blocks * AES_BLOCK_SIZE,
- req->iv);
-
- err = cbc_decrypt(&subreq);
- if (err)
- return err;
-
- if (req->cryptlen == AES_BLOCK_SIZE)
- return 0;
-
- dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen);
- if (req->dst != req->src)
- dst = scatterwalk_ffwd(sg_dst, req->dst,
- subreq.cryptlen);
- }
-
- /* handle ciphertext stealing */
- skcipher_request_set_crypt(&subreq, src, dst,
- req->cryptlen - cbc_blocks * AES_BLOCK_SIZE,
- req->iv);
-
- err = skcipher_walk_virt(&walk, &subreq, false);
- if (err)
- return err;
-
- kernel_fpu_begin();
- aesni_cts_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
- walk.nbytes, walk.iv);
- kernel_fpu_end();
-
- return skcipher_walk_done(&walk, 0);
-}
-
#ifdef CONFIG_X86_64
/* This is the non-AVX version. */
static int ctr_crypt_aesni(struct skcipher_request *req)
@@ -464,39 +300,8 @@ static int xts_decrypt_aesni(struct skcipher_request *req)
}
static struct skcipher_alg aesni_skciphers[] = {
- {
- .base = {
- .cra_name = "cbc(aes)",
- .cra_driver_name = "cbc-aes-aesni",
- .cra_priority = 400,
- .cra_blocksize = AES_BLOCK_SIZE,
- .cra_ctxsize = CRYPTO_AES_CTX_SIZE,
- .cra_module = THIS_MODULE,
- },
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
- .ivsize = AES_BLOCK_SIZE,
- .setkey = aesni_skcipher_setkey,
- .encrypt = cbc_encrypt,
- .decrypt = cbc_decrypt,
- }, {
- .base = {
- .cra_name = "cts(cbc(aes))",
- .cra_driver_name = "cts-cbc-aes-aesni",
- .cra_priority = 400,
- .cra_blocksize = AES_BLOCK_SIZE,
- .cra_ctxsize = CRYPTO_AES_CTX_SIZE,
- .cra_module = THIS_MODULE,
- },
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
- .ivsize = AES_BLOCK_SIZE,
- .walksize = 2 * AES_BLOCK_SIZE,
- .setkey = aesni_skcipher_setkey,
- .encrypt = cts_cbc_encrypt,
- .decrypt = cts_cbc_decrypt,
#ifdef CONFIG_X86_64
- }, {
+ {
.base = {
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-aesni",
@@ -512,8 +317,9 @@ static struct skcipher_alg aesni_skciphers[] = {
.setkey = aesni_skcipher_setkey,
.encrypt = ctr_crypt_aesni,
.decrypt = ctr_crypt_aesni,
+ },
#endif
- }, {
+ {
.base = {
.cra_name = "xts(aes)",
.cra_driver_name = "xts-aes-aesni",
--
2.55.0
next prev parent reply other threads:[~2026-09-21 5:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-21 5:08 [PATCH 00/20] Migrate x86 and RISC-V accelerated AES modes into library Eric Biggers
2026-09-21 5:08 ` [PATCH 01/20] crypto: aes - Fix undesired override of some optimized AES modes Eric Biggers
2026-09-21 5:08 ` [PATCH 02/20] lib/crypto: aes-xctr: Pass counter by value to aes_xctr_arch() Eric Biggers
2026-09-21 5:08 ` [PATCH 03/20] lib/crypto: x86/aes: Clean up aes-aesni.S in preparation for AES modes Eric Biggers
2026-09-21 5:08 ` [PATCH 04/20] lib/crypto: x86/aes-ecb: Add AES-NI optimization Eric Biggers
2026-09-21 5:08 ` [PATCH 05/20] lib/crypto: x86/aes-cbc: " Eric Biggers
2026-09-21 5:08 ` [PATCH 06/20] lib/crypto: x86/aes-ctr: " Eric Biggers
2026-09-21 5:08 ` [PATCH 07/20] lib/crypto: x86/aes-xts: " Eric Biggers
2026-09-21 5:08 ` [PATCH 08/20] crypto: x86/aes-ecb - Remove superseded ECB skcipher Eric Biggers
2026-09-21 5:08 ` Eric Biggers [this message]
2026-09-22 4:15 ` [PATCH 09/20] crypto: x86/aes-cbc - Remove superseded CBC skciphers Karl Mehltretter
2026-09-22 5:11 ` Eric Biggers
2026-09-21 5:08 ` [PATCH 10/20] crypto: x86/aes-ctr - Remove superseded CTR skcipher Eric Biggers
2026-09-21 5:08 ` [PATCH 11/20] crypto: x86/aes-xts - Remove superseded XTS skcipher Eric Biggers
2026-09-21 5:08 ` [PATCH 12/20] lib/crypto: x86/aes-ctr: Migrate AVX-optimized code into library Eric Biggers
2026-09-21 5:08 ` [PATCH 13/20] lib/crypto: x86/aes-xts: " Eric Biggers
2026-09-21 5:09 ` [PATCH 14/20] crypto: x86/aes - Drop superseded 32-bit build support Eric Biggers
2026-09-21 5:09 ` [PATCH 15/20] lib/crypto: riscv/aes: Copy aes-macros.S to library Eric Biggers
2026-09-21 5:09 ` [PATCH 16/20] lib/crypto: riscv/aes: Pass key struct to assembly code Eric Biggers
2026-09-21 5:09 ` [PATCH 17/20] lib/crypto: riscv/aes-ecb: Migrate optimized code into library Eric Biggers
2026-09-21 5:09 ` [PATCH 18/20] lib/crypto: riscv/aes-cbc: " Eric Biggers
2026-09-21 5:09 ` [PATCH 19/20] lib/crypto: riscv/aes-ctr: " Eric Biggers
2026-09-22 5:44 ` Karl Mehltretter
2026-09-22 5:52 ` Eric Biggers
2026-09-21 5:09 ` [PATCH 20/20] lib/crypto: riscv/aes-xts: " Eric Biggers
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