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[CRYPTO] null: Add null blkcipher algorithm 

This patch adds a null blkcipher algorithm called ecb(cipher_null) for
backwards compatibility.  Previously the null algorithm when used by
IPsec copied the data byte by byte.  This new algorithm optimises that
to a straight memcpy which lets us better measure inherent overheads in
our IPsec code.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2007-12-13 22:28:59 +08:00
parent 93cc74e078
commit 3631c650c4
2 changed files with 64 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
crypto/crypto_null.c
View File

@ -16,15 +16,17 @@
* (at your option) any later version.
*
*/
#include <crypto/internal/skcipher.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/crypto.h>
#include <linux/string.h>
#define NULL_KEY_SIZE 0
#define NULL_BLOCK_SIZE 1
#define NULL_DIGEST_SIZE 0
#define NULL_IV_SIZE 0
static int null_compress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
@ -55,6 +57,26 @@ static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
memcpy(dst, src, NULL_BLOCK_SIZE);
}
static int skcipher_null_crypt(struct blkcipher_desc *desc,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
struct blkcipher_walk walk;
int err;
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt(desc, &walk);
while (walk.nbytes) {
if (walk.src.virt.addr != walk.dst.virt.addr)
memcpy(walk.dst.virt.addr, walk.src.virt.addr,
walk.nbytes);
err = blkcipher_walk_done(desc, &walk, 0);
}
return err;
}
static struct crypto_alg compress_null = {
.cra_name = "compress_null",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
@ -96,6 +118,25 @@ static struct crypto_alg cipher_null = {
.cia_decrypt = null_crypt } }
};
static struct crypto_alg skcipher_null = {
.cra_name = "ecb(cipher_null)",
.cra_driver_name = "ecb-cipher_null",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = NULL_BLOCK_SIZE,
.cra_type = &crypto_blkcipher_type,
.cra_ctxsize = 0,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(skcipher_null.cra_list),
.cra_u = { .blkcipher = {
.min_keysize = NULL_KEY_SIZE,
.max_keysize = NULL_KEY_SIZE,
.ivsize = NULL_IV_SIZE,
.setkey = null_setkey,
.encrypt = skcipher_null_crypt,
.decrypt = skcipher_null_crypt } }
};
MODULE_ALIAS("compress_null");
MODULE_ALIAS("digest_null");
MODULE_ALIAS("cipher_null");
@ -108,27 +149,35 @@ static int __init init(void)
if (ret < 0)
goto out;
ret = crypto_register_alg(&skcipher_null);
if (ret < 0)
goto out_unregister_cipher;
ret = crypto_register_alg(&digest_null);
if (ret < 0) {
crypto_unregister_alg(&cipher_null);
goto out;
}
if (ret < 0)
goto out_unregister_skcipher;
ret = crypto_register_alg(&compress_null);
if (ret < 0) {
crypto_unregister_alg(&digest_null);
crypto_unregister_alg(&cipher_null);
goto out;
}
if (ret < 0)
goto out_unregister_digest;
out:
return ret;
out_unregister_digest:
crypto_unregister_alg(&digest_null);
out_unregister_skcipher:
crypto_unregister_alg(&skcipher_null);
out_unregister_cipher:
crypto_unregister_alg(&cipher_null);
goto out;
}
static void __exit fini(void)
{
crypto_unregister_alg(&compress_null);
crypto_unregister_alg(&digest_null);
crypto_unregister_alg(&skcipher_null);
crypto_unregister_alg(&cipher_null);
}

5
include/crypto/internal/skcipher.h
View File

@ -88,5 +88,10 @@ static inline void skcipher_givcrypt_complete(
ablkcipher_request_complete(&req->creq, err);
}
static inline u32 ablkcipher_request_flags(struct ablkcipher_request *req)
{
return req->base.flags;
}
#endif /* _CRYPTO_INTERNAL_SKCIPHER_H */