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crypto: x86/des - drop CTR mode implementation

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DES or Triple DES in counter mode is never used in the kernel, so there
is no point in keeping an accelerated implementation around.

Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2021-01-05 17:48:00 +01:00 committed by Herbert Xu
parent 89b7ba5c8b
commit 768db5fee3
2 changed files with 1 additions and 104 deletions
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104
arch/x86/crypto/des3_ede_glue.c
View File

@ -6,8 +6,6 @@
*
* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
* CTR part based on code (crypto/ctr.c) by:
* (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
*/
#include <crypto/algapi.h>
@ -253,94 +251,6 @@ static int cbc_decrypt(struct skcipher_request *req)
return err;
}
static void ctr_crypt_final(struct des3_ede_x86_ctx *ctx,
struct skcipher_walk *walk)
{
u8 *ctrblk = walk->iv;
u8 keystream[DES3_EDE_BLOCK_SIZE];
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
unsigned int nbytes = walk->nbytes;
des3_ede_enc_blk(ctx, keystream, ctrblk);
crypto_xor_cpy(dst, keystream, src, nbytes);
crypto_inc(ctrblk, DES3_EDE_BLOCK_SIZE);
}
static unsigned int __ctr_crypt(struct des3_ede_x86_ctx *ctx,
struct skcipher_walk *walk)
{
unsigned int bsize = DES3_EDE_BLOCK_SIZE;
unsigned int nbytes = walk->nbytes;
__be64 *src = (__be64 *)walk->src.virt.addr;
__be64 *dst = (__be64 *)walk->dst.virt.addr;
u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
__be64 ctrblocks[3];
/* Process four block batch */
if (nbytes >= bsize * 3) {
do {
/* create ctrblks for parallel encrypt */
ctrblocks[0] = cpu_to_be64(ctrblk++);
ctrblocks[1] = cpu_to_be64(ctrblk++);
ctrblocks[2] = cpu_to_be64(ctrblk++);
des3_ede_enc_blk_3way(ctx, (u8 *)ctrblocks,
(u8 *)ctrblocks);
dst[0] = src[0] ^ ctrblocks[0];
dst[1] = src[1] ^ ctrblocks[1];
dst[2] = src[2] ^ ctrblocks[2];
src += 3;
dst += 3;
} while ((nbytes -= bsize * 3) >= bsize * 3);
if (nbytes < bsize)
goto done;
}
/* Handle leftovers */
do {
ctrblocks[0] = cpu_to_be64(ctrblk++);
des3_ede_enc_blk(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks);
dst[0] = src[0] ^ ctrblocks[0];
src += 1;
dst += 1;
} while ((nbytes -= bsize) >= bsize);
done:
*(__be64 *)walk->iv = cpu_to_be64(ctrblk);
return nbytes;
}
static int ctr_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct des3_ede_x86_ctx *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) >= DES3_EDE_BLOCK_SIZE) {
nbytes = __ctr_crypt(ctx, &walk);
err = skcipher_walk_done(&walk, nbytes);
}
if (nbytes) {
ctr_crypt_final(ctx, &walk);
err = skcipher_walk_done(&walk, 0);
}
return err;
}
static int des3_ede_x86_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
@ -428,20 +338,6 @@ static struct skcipher_alg des3_ede_skciphers[] = {
.setkey = des3_ede_x86_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "ctr(des3_ede)",
.base.cra_driver_name = "ctr-des3_ede-asm",
.base.cra_priority = 300,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct des3_ede_x86_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES3_EDE_BLOCK_SIZE,
.chunksize = DES3_EDE_BLOCK_SIZE,
.setkey = des3_ede_x86_setkey_skcipher,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
}
};

1
crypto/Kconfig
View File

@ -1427,6 +1427,7 @@ config CRYPTO_DES3_EDE_X86_64
depends on X86 && 64BIT
select CRYPTO_SKCIPHER
select CRYPTO_LIB_DES
imply CRYPTO_CTR
help
Triple DES EDE (FIPS 46-3) algorithm.