mirror of
https://github.com/torvalds/linux.git
synced 2024-11-13 23:51:39 +00:00
crypto: arm64/aes - implement accelerated ESSIV/CBC mode
Add an accelerated version of the 'essiv(cbc(aes),sha256)' skcipher, which is used by fscrypt or dm-crypt on systems where CBC mode is signficantly more performant than XTS mode (e.g., when using a h/w accelerator which supports the former but not the latter) This avoids a separate call into the AES cipher for every invocation. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
65d0042b52
commit
735177ca14
@ -10,6 +10,7 @@
|
||||
#include <asm/simd.h>
|
||||
#include <crypto/aes.h>
|
||||
#include <crypto/ctr.h>
|
||||
#include <crypto/sha.h>
|
||||
#include <crypto/internal/hash.h>
|
||||
#include <crypto/internal/simd.h>
|
||||
#include <crypto/internal/skcipher.h>
|
||||
@ -30,6 +31,8 @@
|
||||
#define aes_cbc_decrypt ce_aes_cbc_decrypt
|
||||
#define aes_cbc_cts_encrypt ce_aes_cbc_cts_encrypt
|
||||
#define aes_cbc_cts_decrypt ce_aes_cbc_cts_decrypt
|
||||
#define aes_essiv_cbc_encrypt ce_aes_essiv_cbc_encrypt
|
||||
#define aes_essiv_cbc_decrypt ce_aes_essiv_cbc_decrypt
|
||||
#define aes_ctr_encrypt ce_aes_ctr_encrypt
|
||||
#define aes_xts_encrypt ce_aes_xts_encrypt
|
||||
#define aes_xts_decrypt ce_aes_xts_decrypt
|
||||
@ -44,6 +47,8 @@ MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
|
||||
#define aes_cbc_decrypt neon_aes_cbc_decrypt
|
||||
#define aes_cbc_cts_encrypt neon_aes_cbc_cts_encrypt
|
||||
#define aes_cbc_cts_decrypt neon_aes_cbc_cts_decrypt
|
||||
#define aes_essiv_cbc_encrypt neon_aes_essiv_cbc_encrypt
|
||||
#define aes_essiv_cbc_decrypt neon_aes_essiv_cbc_decrypt
|
||||
#define aes_ctr_encrypt neon_aes_ctr_encrypt
|
||||
#define aes_xts_encrypt neon_aes_xts_encrypt
|
||||
#define aes_xts_decrypt neon_aes_xts_decrypt
|
||||
@ -51,6 +56,7 @@ MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
|
||||
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
|
||||
MODULE_ALIAS_CRYPTO("ecb(aes)");
|
||||
MODULE_ALIAS_CRYPTO("cbc(aes)");
|
||||
MODULE_ALIAS_CRYPTO("essiv(cbc(aes),sha256)");
|
||||
MODULE_ALIAS_CRYPTO("ctr(aes)");
|
||||
MODULE_ALIAS_CRYPTO("xts(aes)");
|
||||
MODULE_ALIAS_CRYPTO("cmac(aes)");
|
||||
@ -87,6 +93,13 @@ asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u32 const rk1[],
|
||||
int rounds, int blocks, u32 const rk2[], u8 iv[],
|
||||
int first);
|
||||
|
||||
asmlinkage void aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[],
|
||||
int rounds, int blocks, u8 iv[],
|
||||
u32 const rk2[]);
|
||||
asmlinkage void aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[],
|
||||
int rounds, int blocks, u8 iv[],
|
||||
u32 const rk2[]);
|
||||
|
||||
asmlinkage void aes_mac_update(u8 const in[], u32 const rk[], int rounds,
|
||||
int blocks, u8 dg[], int enc_before,
|
||||
int enc_after);
|
||||
@ -102,6 +115,12 @@ struct crypto_aes_xts_ctx {
|
||||
struct crypto_aes_ctx __aligned(8) key2;
|
||||
};
|
||||
|
||||
struct crypto_aes_essiv_cbc_ctx {
|
||||
struct crypto_aes_ctx key1;
|
||||
struct crypto_aes_ctx __aligned(8) key2;
|
||||
struct crypto_shash *hash;
|
||||
};
|
||||
|
||||
struct mac_tfm_ctx {
|
||||
struct crypto_aes_ctx key;
|
||||
u8 __aligned(8) consts[];
|
||||
@ -146,6 +165,31 @@ static int xts_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int essiv_cbc_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
|
||||
unsigned int key_len)
|
||||
{
|
||||
struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
|
||||
SHASH_DESC_ON_STACK(desc, ctx->hash);
|
||||
u8 digest[SHA256_DIGEST_SIZE];
|
||||
int ret;
|
||||
|
||||
ret = aes_expandkey(&ctx->key1, in_key, key_len);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
desc->tfm = ctx->hash;
|
||||
crypto_shash_digest(desc, in_key, key_len, digest);
|
||||
|
||||
ret = aes_expandkey(&ctx->key2, digest, sizeof(digest));
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
return 0;
|
||||
out:
|
||||
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int ecb_encrypt(struct skcipher_request *req)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
@ -360,6 +404,68 @@ static int cts_cbc_decrypt(struct skcipher_request *req)
|
||||
return skcipher_walk_done(&walk, 0);
|
||||
}
|
||||
|
||||
static int essiv_cbc_init_tfm(struct crypto_skcipher *tfm)
|
||||
{
|
||||
struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
|
||||
|
||||
ctx->hash = crypto_alloc_shash("sha256", 0, 0);
|
||||
if (IS_ERR(ctx->hash))
|
||||
return PTR_ERR(ctx->hash);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void essiv_cbc_exit_tfm(struct crypto_skcipher *tfm)
|
||||
{
|
||||
struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
|
||||
|
||||
crypto_free_shash(ctx->hash);
|
||||
}
|
||||
|
||||
static int essiv_cbc_encrypt(struct skcipher_request *req)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
|
||||
int err, rounds = 6 + ctx->key1.key_length / 4;
|
||||
struct skcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
|
||||
err = skcipher_walk_virt(&walk, req, false);
|
||||
|
||||
blocks = walk.nbytes / AES_BLOCK_SIZE;
|
||||
if (blocks) {
|
||||
kernel_neon_begin();
|
||||
aes_essiv_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
ctx->key1.key_enc, rounds, blocks,
|
||||
req->iv, ctx->key2.key_enc);
|
||||
kernel_neon_end();
|
||||
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
return err ?: cbc_encrypt_walk(req, &walk);
|
||||
}
|
||||
|
||||
static int essiv_cbc_decrypt(struct skcipher_request *req)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
|
||||
int err, rounds = 6 + ctx->key1.key_length / 4;
|
||||
struct skcipher_walk walk;
|
||||
unsigned int blocks;
|
||||
|
||||
err = skcipher_walk_virt(&walk, req, false);
|
||||
|
||||
blocks = walk.nbytes / AES_BLOCK_SIZE;
|
||||
if (blocks) {
|
||||
kernel_neon_begin();
|
||||
aes_essiv_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
|
||||
ctx->key1.key_dec, rounds, blocks,
|
||||
req->iv, ctx->key2.key_enc);
|
||||
kernel_neon_end();
|
||||
err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
|
||||
}
|
||||
return err ?: cbc_decrypt_walk(req, &walk);
|
||||
}
|
||||
|
||||
static int ctr_encrypt(struct skcipher_request *req)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
@ -515,6 +621,24 @@ static struct skcipher_alg aes_algs[] = { {
|
||||
.encrypt = cts_cbc_encrypt,
|
||||
.decrypt = cts_cbc_decrypt,
|
||||
.init = cts_cbc_init_tfm,
|
||||
}, {
|
||||
.base = {
|
||||
.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,
|
||||
},
|
||||
.min_keysize = AES_MIN_KEY_SIZE,
|
||||
.max_keysize = AES_MAX_KEY_SIZE,
|
||||
.ivsize = AES_BLOCK_SIZE,
|
||||
.setkey = essiv_cbc_set_key,
|
||||
.encrypt = essiv_cbc_encrypt,
|
||||
.decrypt = essiv_cbc_decrypt,
|
||||
.init = essiv_cbc_init_tfm,
|
||||
.exit = essiv_cbc_exit_tfm,
|
||||
}, {
|
||||
.base = {
|
||||
.cra_name = "__ctr(aes)",
|
||||
|
||||
@ -118,8 +118,23 @@ AES_ENDPROC(aes_ecb_decrypt)
|
||||
* int blocks, u8 iv[])
|
||||
* aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
|
||||
* int blocks, u8 iv[])
|
||||
* aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[],
|
||||
* int rounds, int blocks, u8 iv[],
|
||||
* u32 const rk2[]);
|
||||
* aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[],
|
||||
* int rounds, int blocks, u8 iv[],
|
||||
* u32 const rk2[]);
|
||||
*/
|
||||
|
||||
AES_ENTRY(aes_essiv_cbc_encrypt)
|
||||
ld1 {v4.16b}, [x5] /* get iv */
|
||||
|
||||
mov w8, #14 /* AES-256: 14 rounds */
|
||||
enc_prepare w8, x6, x7
|
||||
encrypt_block v4, w8, x6, x7, w9
|
||||
enc_switch_key w3, x2, x6
|
||||
b .Lcbcencloop4x
|
||||
|
||||
AES_ENTRY(aes_cbc_encrypt)
|
||||
ld1 {v4.16b}, [x5] /* get iv */
|
||||
enc_prepare w3, x2, x6
|
||||
@ -153,13 +168,25 @@ AES_ENTRY(aes_cbc_encrypt)
|
||||
st1 {v4.16b}, [x5] /* return iv */
|
||||
ret
|
||||
AES_ENDPROC(aes_cbc_encrypt)
|
||||
AES_ENDPROC(aes_essiv_cbc_encrypt)
|
||||
|
||||
AES_ENTRY(aes_essiv_cbc_decrypt)
|
||||
stp x29, x30, [sp, #-16]!
|
||||
mov x29, sp
|
||||
|
||||
ld1 {cbciv.16b}, [x5] /* get iv */
|
||||
|
||||
mov w8, #14 /* AES-256: 14 rounds */
|
||||
enc_prepare w8, x6, x7
|
||||
encrypt_block cbciv, w8, x6, x7, w9
|
||||
b .Lessivcbcdecstart
|
||||
|
||||
AES_ENTRY(aes_cbc_decrypt)
|
||||
stp x29, x30, [sp, #-16]!
|
||||
mov x29, sp
|
||||
|
||||
ld1 {cbciv.16b}, [x5] /* get iv */
|
||||
.Lessivcbcdecstart:
|
||||
dec_prepare w3, x2, x6
|
||||
|
||||
.LcbcdecloopNx:
|
||||
@ -212,6 +239,7 @@ ST5( st1 {v4.16b}, [x0], #16 )
|
||||
ldp x29, x30, [sp], #16
|
||||
ret
|
||||
AES_ENDPROC(aes_cbc_decrypt)
|
||||
AES_ENDPROC(aes_essiv_cbc_decrypt)
|
||||
|
||||
|
||||
/*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user