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@xxxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
---
arch/x86/crypto/des3_ede_glue.c | 104 --------------------
crypto/Kconfig | 1 +
2 files changed, 1 insertion(+), 104 deletions(-)
diff --git a/arch/x86/crypto/des3_ede_glue.c b/arch/x86/crypto/des3_ede_glue.c
index 89830e531350..e7cb68a3db3b 100644
--- a/arch/x86/crypto/des3_ede_glue.c
+++ b/arch/x86/crypto/des3_ede_glue.c
@@ -6,8 +6,6 @@
*
* CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
* Copyright (c) 2006 Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
- * CTR part based on code (crypto/ctr.c) by:
- * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@xxxxxxxxxx>
*/
#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,
}
};
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 606f94079f05..5e820a57d138 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -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.
--
2.17.1
