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-rw-r--r--arch/arm64/crypto/aes-ce.S3
-rw-r--r--arch/arm64/crypto/aes-glue.c2
-rw-r--r--arch/arm64/crypto/aes-modes.S3
-rw-r--r--arch/arm64/crypto/aes-neon.S5
-rw-r--r--arch/arm64/crypto/aes-neonbs-glue.c111
5 files changed, 110 insertions, 14 deletions
diff --git a/arch/arm64/crypto/aes-ce.S b/arch/arm64/crypto/aes-ce.S
index 00bd2885feaa..c132c49c89a8 100644
--- a/arch/arm64/crypto/aes-ce.S
+++ b/arch/arm64/crypto/aes-ce.S
@@ -21,6 +21,9 @@
.macro xts_reload_mask, tmp
.endm
+ .macro xts_cts_skip_tw, reg, lbl
+ .endm
+
/* preload all round keys */
.macro load_round_keys, rounds, rk
cmp \rounds, #12
diff --git a/arch/arm64/crypto/aes-glue.c b/arch/arm64/crypto/aes-glue.c
index 23ee7c85c0b7..aa57dc639f77 100644
--- a/arch/arm64/crypto/aes-glue.c
+++ b/arch/arm64/crypto/aes-glue.c
@@ -1071,5 +1071,7 @@ module_cpu_feature_match(AES, aes_init);
module_init(aes_init);
EXPORT_SYMBOL(neon_aes_ecb_encrypt);
EXPORT_SYMBOL(neon_aes_cbc_encrypt);
+EXPORT_SYMBOL(neon_aes_xts_encrypt);
+EXPORT_SYMBOL(neon_aes_xts_decrypt);
#endif
module_exit(aes_exit);
diff --git a/arch/arm64/crypto/aes-modes.S b/arch/arm64/crypto/aes-modes.S
index f2c2ba739f36..131618389f1f 100644
--- a/arch/arm64/crypto/aes-modes.S
+++ b/arch/arm64/crypto/aes-modes.S
@@ -442,6 +442,7 @@ AES_ENTRY(aes_xts_encrypt)
cbz w7, .Lxtsencnotfirst
enc_prepare w3, x5, x8
+ xts_cts_skip_tw w7, .LxtsencNx
encrypt_block v4, w3, x5, x8, w7 /* first tweak */
enc_switch_key w3, x2, x8
b .LxtsencNx
@@ -530,10 +531,12 @@ AES_ENTRY(aes_xts_decrypt)
ld1 {v4.16b}, [x6]
xts_load_mask v8
+ xts_cts_skip_tw w7, .Lxtsdecskiptw
cbz w7, .Lxtsdecnotfirst
enc_prepare w3, x5, x8
encrypt_block v4, w3, x5, x8, w7 /* first tweak */
+.Lxtsdecskiptw:
dec_prepare w3, x2, x8
b .LxtsdecNx
diff --git a/arch/arm64/crypto/aes-neon.S b/arch/arm64/crypto/aes-neon.S
index 0cac5df6c901..22d9b110cf78 100644
--- a/arch/arm64/crypto/aes-neon.S
+++ b/arch/arm64/crypto/aes-neon.S
@@ -19,6 +19,11 @@
xts_load_mask \tmp
.endm
+ /* special case for the neon-bs driver calling into this one for CTS */
+ .macro xts_cts_skip_tw, reg, lbl
+ tbnz \reg, #1, \lbl
+ .endm
+
/* multiply by polynomial 'x' in GF(2^8) */
.macro mul_by_x, out, in, temp, const
sshr \temp, \in, #7
diff --git a/arch/arm64/crypto/aes-neonbs-glue.c b/arch/arm64/crypto/aes-neonbs-glue.c
index bafd2ebef8f1..ea873b8904c4 100644
--- a/arch/arm64/crypto/aes-neonbs-glue.c
+++ b/arch/arm64/crypto/aes-neonbs-glue.c
@@ -11,6 +11,7 @@
#include <crypto/ctr.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
#include <crypto/xts.h>
#include <linux/module.h>
@@ -45,6 +46,12 @@ asmlinkage void neon_aes_ecb_encrypt(u8 out[], u8 const in[], u32 const rk[],
int rounds, int blocks);
asmlinkage void neon_aes_cbc_encrypt(u8 out[], u8 const in[], u32 const rk[],
int rounds, int blocks, u8 iv[]);
+asmlinkage void neon_aes_xts_encrypt(u8 out[], u8 const in[],
+ u32 const rk1[], int rounds, int bytes,
+ u32 const rk2[], u8 iv[], int first);
+asmlinkage void neon_aes_xts_decrypt(u8 out[], u8 const in[],
+ u32 const rk1[], int rounds, int bytes,
+ u32 const rk2[], u8 iv[], int first);
struct aesbs_ctx {
u8 rk[13 * (8 * AES_BLOCK_SIZE) + 32];
@@ -64,6 +71,7 @@ struct aesbs_ctr_ctx {
struct aesbs_xts_ctx {
struct aesbs_ctx key;
u32 twkey[AES_MAX_KEYLENGTH_U32];
+ struct crypto_aes_ctx cts;
};
static int aesbs_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
@@ -270,6 +278,10 @@ static int aesbs_xts_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
return err;
key_len /= 2;
+ err = aes_expandkey(&ctx->cts, in_key, key_len);
+ if (err)
+ return err;
+
err = aes_expandkey(&rk, in_key + key_len, key_len);
if (err)
return err;
@@ -302,48 +314,119 @@ static int ctr_encrypt_sync(struct skcipher_request *req)
return ctr_encrypt(req);
}
-static int __xts_crypt(struct skcipher_request *req,
+static int __xts_crypt(struct skcipher_request *req, bool encrypt,
void (*fn)(u8 out[], u8 const in[], u8 const rk[],
int rounds, int blocks, u8 iv[]))
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
+ int tail = req->cryptlen % (8 * AES_BLOCK_SIZE);
+ struct scatterlist sg_src[2], sg_dst[2];
+ struct skcipher_request subreq;
+ struct scatterlist *src, *dst;
struct skcipher_walk walk;
- int err;
+ int nbytes, err;
+ int first = 1;
+ u8 *out, *in;
+
+ if (req->cryptlen < AES_BLOCK_SIZE)
+ return -EINVAL;
+
+ /* ensure that the cts tail is covered by a single step */
+ if (unlikely(tail > 0 && tail < AES_BLOCK_SIZE)) {
+ int xts_blocks = DIV_ROUND_UP(req->cryptlen,
+ AES_BLOCK_SIZE) - 2;
+
+ skcipher_request_set_tfm(&subreq, tfm);
+ skcipher_request_set_callback(&subreq,
+ skcipher_request_flags(req),
+ NULL, NULL);
+ skcipher_request_set_crypt(&subreq, req->src, req->dst,
+ xts_blocks * AES_BLOCK_SIZE,
+ req->iv);
+ req = &subreq;
+ } else {
+ tail = 0;
+ }
err = skcipher_walk_virt(&walk, req, false);
if (err)
return err;
- kernel_neon_begin();
- neon_aes_ecb_encrypt(walk.iv, walk.iv, ctx->twkey, ctx->key.rounds, 1);
- kernel_neon_end();
-
while (walk.nbytes >= AES_BLOCK_SIZE) {
unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE;
- if (walk.nbytes < walk.total)
+ if (walk.nbytes < walk.total || walk.nbytes % AES_BLOCK_SIZE)
blocks = round_down(blocks,
walk.stride / AES_BLOCK_SIZE);
+ out = walk.dst.virt.addr;
+ in = walk.src.virt.addr;
+ nbytes = walk.nbytes;
+
kernel_neon_begin();
- fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->key.rk,
- ctx->key.rounds, blocks, walk.iv);
+ if (likely(blocks > 6)) { /* plain NEON is faster otherwise */
+ if (first)
+ neon_aes_ecb_encrypt(walk.iv, walk.iv,
+ ctx->twkey,
+ ctx->key.rounds, 1);
+ first = 0;
+
+ fn(out, in, ctx->key.rk, ctx->key.rounds, blocks,
+ walk.iv);
+
+ out += blocks * AES_BLOCK_SIZE;
+ in += blocks * AES_BLOCK_SIZE;
+ nbytes -= blocks * AES_BLOCK_SIZE;
+ }
+
+ if (walk.nbytes == walk.total && nbytes > 0)
+ goto xts_tail;
+
kernel_neon_end();
- err = skcipher_walk_done(&walk,
- walk.nbytes - blocks * AES_BLOCK_SIZE);
+ skcipher_walk_done(&walk, nbytes);
}
- return err;
+
+ if (err || likely(!tail))
+ return err;
+
+ /* handle ciphertext stealing */
+ dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen);
+ if (req->dst != req->src)
+ dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen);
+
+ skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail,
+ req->iv);
+
+ err = skcipher_walk_virt(&walk, req, false);
+ if (err)
+ return err;
+
+ out = walk.dst.virt.addr;
+ in = walk.src.virt.addr;
+ nbytes = walk.nbytes;
+
+ kernel_neon_begin();
+xts_tail:
+ if (encrypt)
+ neon_aes_xts_encrypt(out, in, ctx->cts.key_enc, ctx->key.rounds,
+ nbytes, ctx->twkey, walk.iv, first ?: 2);
+ else
+ neon_aes_xts_decrypt(out, in, ctx->cts.key_dec, ctx->key.rounds,
+ nbytes, ctx->twkey, walk.iv, first ?: 2);
+ kernel_neon_end();
+
+ return skcipher_walk_done(&walk, 0);
}
static int xts_encrypt(struct skcipher_request *req)
{
- return __xts_crypt(req, aesbs_xts_encrypt);
+ return __xts_crypt(req, true, aesbs_xts_encrypt);
}
static int xts_decrypt(struct skcipher_request *req)
{
- return __xts_crypt(req, aesbs_xts_decrypt);
+ return __xts_crypt(req, false, aesbs_xts_decrypt);
}
static struct skcipher_alg aes_algs[] = { {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.