[CRYPTO] cbc: Use crypto_xor
This patch replaces the custom xor in CBC with the generic crypto_xor. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>hifive-unleashed-5.1
Herbert Xu
parent
7613636def
commit
3c7f076da5
93
crypto/cbc.c
93
crypto/cbc.c
|
|
@ -20,7 +20,6 @@
|
|||
|
||||
struct crypto_cbc_ctx {
|
||||
struct crypto_cipher *child;
|
||||
void (*xor)(u8 *dst, const u8 *src, unsigned int bs);
|
||||
};
|
||||
|
||||
static int crypto_cbc_setkey(struct crypto_tfm *parent, const u8 *key,
|
||||
|
|
@ -41,9 +40,7 @@ static int crypto_cbc_setkey(struct crypto_tfm *parent, const u8 *key,
|
|||
|
||||
static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
|
||||
struct blkcipher_walk *walk,
|
||||
struct crypto_cipher *tfm,
|
||||
void (*xor)(u8 *, const u8 *,
|
||||
unsigned int))
|
||||
struct crypto_cipher *tfm)
|
||||
{
|
||||
void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
|
||||
crypto_cipher_alg(tfm)->cia_encrypt;
|
||||
|
|
@ -54,7 +51,7 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
|
|||
u8 *iv = walk->iv;
|
||||
|
||||
do {
|
||||
xor(iv, src, bsize);
|
||||
crypto_xor(iv, src, bsize);
|
||||
fn(crypto_cipher_tfm(tfm), dst, iv);
|
||||
memcpy(iv, dst, bsize);
|
||||
|
||||
|
|
@ -67,9 +64,7 @@ static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
|
|||
|
||||
static int crypto_cbc_encrypt_inplace(struct blkcipher_desc *desc,
|
||||
struct blkcipher_walk *walk,
|
||||
struct crypto_cipher *tfm,
|
||||
void (*xor)(u8 *, const u8 *,
|
||||
unsigned int))
|
||||
struct crypto_cipher *tfm)
|
||||
{
|
||||
void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
|
||||
crypto_cipher_alg(tfm)->cia_encrypt;
|
||||
|
|
@ -79,7 +74,7 @@ static int crypto_cbc_encrypt_inplace(struct blkcipher_desc *desc,
|
|||
u8 *iv = walk->iv;
|
||||
|
||||
do {
|
||||
xor(src, iv, bsize);
|
||||
crypto_xor(src, iv, bsize);
|
||||
fn(crypto_cipher_tfm(tfm), src, src);
|
||||
iv = src;
|
||||
|
||||
|
|
@ -99,7 +94,6 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
|
|||
struct crypto_blkcipher *tfm = desc->tfm;
|
||||
struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
|
||||
struct crypto_cipher *child = ctx->child;
|
||||
void (*xor)(u8 *, const u8 *, unsigned int bs) = ctx->xor;
|
||||
int err;
|
||||
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
|
|
@ -107,11 +101,9 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
|
|||
|
||||
while ((nbytes = walk.nbytes)) {
|
||||
if (walk.src.virt.addr == walk.dst.virt.addr)
|
||||
nbytes = crypto_cbc_encrypt_inplace(desc, &walk, child,
|
||||
xor);
|
||||
nbytes = crypto_cbc_encrypt_inplace(desc, &walk, child);
|
||||
else
|
||||
nbytes = crypto_cbc_encrypt_segment(desc, &walk, child,
|
||||
xor);
|
||||
nbytes = crypto_cbc_encrypt_segment(desc, &walk, child);
|
||||
err = blkcipher_walk_done(desc, &walk, nbytes);
|
||||
}
|
||||
|
||||
|
|
@ -120,9 +112,7 @@ static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
|
|||
|
||||
static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
|
||||
struct blkcipher_walk *walk,
|
||||
struct crypto_cipher *tfm,
|
||||
void (*xor)(u8 *, const u8 *,
|
||||
unsigned int))
|
||||
struct crypto_cipher *tfm)
|
||||
{
|
||||
void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
|
||||
crypto_cipher_alg(tfm)->cia_decrypt;
|
||||
|
|
@ -134,7 +124,7 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
|
|||
|
||||
do {
|
||||
fn(crypto_cipher_tfm(tfm), dst, src);
|
||||
xor(dst, iv, bsize);
|
||||
crypto_xor(dst, iv, bsize);
|
||||
iv = src;
|
||||
|
||||
src += bsize;
|
||||
|
|
@ -148,9 +138,7 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
|
|||
|
||||
static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
|
||||
struct blkcipher_walk *walk,
|
||||
struct crypto_cipher *tfm,
|
||||
void (*xor)(u8 *, const u8 *,
|
||||
unsigned int))
|
||||
struct crypto_cipher *tfm)
|
||||
{
|
||||
void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
|
||||
crypto_cipher_alg(tfm)->cia_decrypt;
|
||||
|
|
@ -171,11 +159,11 @@ static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
|
|||
fn(crypto_cipher_tfm(tfm), src, src);
|
||||
if ((nbytes -= bsize) < bsize)
|
||||
break;
|
||||
xor(src, src - bsize, bsize);
|
||||
crypto_xor(src, src - bsize, bsize);
|
||||
src -= bsize;
|
||||
}
|
||||
|
||||
xor(src, first_iv, bsize);
|
||||
crypto_xor(src, first_iv, bsize);
|
||||
|
||||
return nbytes;
|
||||
}
|
||||
|
|
@ -188,7 +176,6 @@ static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
|
|||
struct crypto_blkcipher *tfm = desc->tfm;
|
||||
struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
|
||||
struct crypto_cipher *child = ctx->child;
|
||||
void (*xor)(u8 *, const u8 *, unsigned int bs) = ctx->xor;
|
||||
int err;
|
||||
|
||||
blkcipher_walk_init(&walk, dst, src, nbytes);
|
||||
|
|
@ -196,48 +183,15 @@ static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
|
|||
|
||||
while ((nbytes = walk.nbytes)) {
|
||||
if (walk.src.virt.addr == walk.dst.virt.addr)
|
||||
nbytes = crypto_cbc_decrypt_inplace(desc, &walk, child,
|
||||
xor);
|
||||
nbytes = crypto_cbc_decrypt_inplace(desc, &walk, child);
|
||||
else
|
||||
nbytes = crypto_cbc_decrypt_segment(desc, &walk, child,
|
||||
xor);
|
||||
nbytes = crypto_cbc_decrypt_segment(desc, &walk, child);
|
||||
err = blkcipher_walk_done(desc, &walk, nbytes);
|
||||
}
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static void xor_byte(u8 *a, const u8 *b, unsigned int bs)
|
||||
{
|
||||
do {
|
||||
*a++ ^= *b++;
|
||||
} while (--bs);
|
||||
}
|
||||
|
||||
static void xor_quad(u8 *dst, const u8 *src, unsigned int bs)
|
||||
{
|
||||
u32 *a = (u32 *)dst;
|
||||
u32 *b = (u32 *)src;
|
||||
|
||||
do {
|
||||
*a++ ^= *b++;
|
||||
} while ((bs -= 4));
|
||||
}
|
||||
|
||||
static void xor_64(u8 *a, const u8 *b, unsigned int bs)
|
||||
{
|
||||
((u32 *)a)[0] ^= ((u32 *)b)[0];
|
||||
((u32 *)a)[1] ^= ((u32 *)b)[1];
|
||||
}
|
||||
|
||||
static void xor_128(u8 *a, const u8 *b, unsigned int bs)
|
||||
{
|
||||
((u32 *)a)[0] ^= ((u32 *)b)[0];
|
||||
((u32 *)a)[1] ^= ((u32 *)b)[1];
|
||||
((u32 *)a)[2] ^= ((u32 *)b)[2];
|
||||
((u32 *)a)[3] ^= ((u32 *)b)[3];
|
||||
}
|
||||
|
||||
static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
|
||||
{
|
||||
struct crypto_instance *inst = (void *)tfm->__crt_alg;
|
||||
|
|
@ -245,22 +199,6 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
|
|||
struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
struct crypto_cipher *cipher;
|
||||
|
||||
switch (crypto_tfm_alg_blocksize(tfm)) {
|
||||
case 8:
|
||||
ctx->xor = xor_64;
|
||||
break;
|
||||
|
||||
case 16:
|
||||
ctx->xor = xor_128;
|
||||
break;
|
||||
|
||||
default:
|
||||
if (crypto_tfm_alg_blocksize(tfm) % 4)
|
||||
ctx->xor = xor_byte;
|
||||
else
|
||||
ctx->xor = xor_quad;
|
||||
}
|
||||
|
||||
cipher = crypto_spawn_cipher(spawn);
|
||||
if (IS_ERR(cipher))
|
||||
return PTR_ERR(cipher);
|
||||
|
|
@ -300,8 +238,9 @@ static struct crypto_instance *crypto_cbc_alloc(struct rtattr **tb)
|
|||
inst->alg.cra_alignmask = alg->cra_alignmask;
|
||||
inst->alg.cra_type = &crypto_blkcipher_type;
|
||||
|
||||
if (!(alg->cra_blocksize % 4))
|
||||
inst->alg.cra_alignmask |= 3;
|
||||
/* We access the data as u32s when xoring. */
|
||||
inst->alg.cra_alignmask |= __alignof__(u32) - 1;
|
||||
|
||||
inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
|
||||
inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
|
||||
inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
|
||||
|
|
|
|||
Loading…
Reference in New Issue