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crypto: x86/blowfish - drop CTR mode implementation

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Blowfish 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 17:48:01 +01:00 committed by Herbert Xu
parent 768db5fee3
commit c0a64926c5
2 changed files with 1 additions and 107 deletions
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107
arch/x86/crypto/blowfish_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>
@ -247,97 +245,6 @@ static int cbc_decrypt(struct skcipher_request *req)
return err;
}
static void ctr_crypt_final(struct bf_ctx *ctx, struct skcipher_walk *walk)
{
u8 *ctrblk = walk->iv;
u8 keystream[BF_BLOCK_SIZE];
u8 *src = walk->src.virt.addr;
u8 *dst = walk->dst.virt.addr;
unsigned int nbytes = walk->nbytes;
blowfish_enc_blk(ctx, keystream, ctrblk);
crypto_xor_cpy(dst, keystream, src, nbytes);
crypto_inc(ctrblk, BF_BLOCK_SIZE);
}
static unsigned int __ctr_crypt(struct bf_ctx *ctx, struct skcipher_walk *walk)
{
unsigned int bsize = BF_BLOCK_SIZE;
unsigned int nbytes = walk->nbytes;
u64 *src = (u64 *)walk->src.virt.addr;
u64 *dst = (u64 *)walk->dst.virt.addr;
u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
__be64 ctrblocks[4];
/* Process four block batch */
if (nbytes >= bsize * 4) {
do {
if (dst != src) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = src[3];
}
/* create ctrblks for parallel encrypt */
ctrblocks[0] = cpu_to_be64(ctrblk++);
ctrblocks[1] = cpu_to_be64(ctrblk++);
ctrblocks[2] = cpu_to_be64(ctrblk++);
ctrblocks[3] = cpu_to_be64(ctrblk++);
blowfish_enc_blk_xor_4way(ctx, (u8 *)dst,
(u8 *)ctrblocks);
src += 4;
dst += 4;
} while ((nbytes -= bsize * 4) >= bsize * 4);
if (nbytes < bsize)
goto done;
}
/* Handle leftovers */
do {
if (dst != src)
*dst = *src;
ctrblocks[0] = cpu_to_be64(ctrblk++);
blowfish_enc_blk_xor(ctx, (u8 *)dst, (u8 *)ctrblocks);
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 bf_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) >= BF_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 struct crypto_alg bf_cipher_alg = {
.cra_name = "blowfish",
.cra_driver_name = "blowfish-asm",
@ -384,20 +291,6 @@ static struct skcipher_alg bf_skcipher_algs[] = {
.setkey = blowfish_setkey_skcipher,
.encrypt = cbc_encrypt,
.decrypt = cbc_decrypt,
}, {
.base.cra_name = "ctr(blowfish)",
.base.cra_driver_name = "ctr-blowfish-asm",
.base.cra_priority = 300,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct bf_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = BF_MIN_KEY_SIZE,
.max_keysize = BF_MAX_KEY_SIZE,
.ivsize = BF_BLOCK_SIZE,
.chunksize = BF_BLOCK_SIZE,
.setkey = blowfish_setkey_skcipher,
.encrypt = ctr_crypt,
.decrypt = ctr_crypt,
},
};

1
crypto/Kconfig
View File

@ -1255,6 +1255,7 @@ config CRYPTO_BLOWFISH_X86_64
depends on X86 && 64BIT
select CRYPTO_SKCIPHER
select CRYPTO_BLOWFISH_COMMON
imply CRYPTO_CTR
help
Blowfish cipher algorithm (x86_64), by Bruce Schneier.