From 3631c650c495d61b1dabf32eb26b46873636e918 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Thu, 13 Dec 2007 22:28:59 +0800 Subject: [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 --- crypto/crypto_null.c | 69 ++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 59 insertions(+), 10 deletions(-) (limited to 'crypto') diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c index 29f77477d701..fc2d2a4d7789 100644 --- a/crypto/crypto_null.c +++ b/crypto/crypto_null.c @@ -16,15 +16,17 @@ * (at your option) any later version. * */ + +#include #include #include #include -#include #include #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); } -- cgit v1.2.3