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crypto: serpent-sse2 - add xts support
Patch adds XTS support for serpent-sse2 by using xts_crypt(). Patch has been tested with tcrypt and automated filesystem tests. Tcrypt benchmarks results (serpent-sse2/serpent_generic speed ratios): Intel Celeron T1600 (x86_64) (fam:6, model:15, step:13): size xts-enc xts-dec 16B 0.98x 1.00x 64B 1.00x 1.01x 256B 2.78x 2.75x 1024B 3.30x 3.26x 8192B 3.39x 3.30x AMD Phenom II 1055T (x86_64) (fam:16, model:10): size xts-enc xts-dec 16B 1.05x 1.02x 64B 1.04x 1.03x 256B 2.10x 2.05x 1024B 2.34x 2.35x 8192B 2.34x 2.40x Intel Atom N270 (i586): size xts-enc xts-dec 16B 0.95x 0.96x 64B 1.53x 1.50x 256B 1.72x 1.75x 1024B 1.88x 1.87x 8192B 1.86x 1.83x Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jussi Kivilinna
Herbert Xu
parent
18482053f9
commit
5962f8b66d
@ -40,6 +40,7 @@
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#include <crypto/b128ops.h>
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#include <crypto/ctr.h>
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#include <crypto/lrw.h>
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#include <crypto/xts.h>
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#include <asm/i387.h>
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#include <asm/serpent.h>
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#include <crypto/scatterwalk.h>
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@ -50,6 +51,10 @@
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#define HAS_LRW
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#endif
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#if defined(CONFIG_CRYPTO_XTS) || defined(CONFIG_CRYPTO_XTS_MODULE)
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#define HAS_XTS
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#endif
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struct async_serpent_ctx {
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struct cryptd_ablkcipher *cryptd_tfm;
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};
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@ -465,7 +470,7 @@ static struct crypto_alg blk_ctr_alg = {
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},
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};
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#ifdef HAS_LRW
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#if defined(HAS_LRW) || defined(HAS_XTS)
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struct crypt_priv {
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struct serpent_ctx *ctx;
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@ -506,6 +511,10 @@ static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
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__serpent_decrypt(ctx->ctx, srcdst, srcdst);
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}
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#endif
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#ifdef HAS_LRW
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struct serpent_lrw_ctx {
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struct lrw_table_ctx lrw_table;
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struct serpent_ctx serpent_ctx;
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@ -611,6 +620,114 @@ static struct crypto_alg blk_lrw_alg = {
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#endif
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#ifdef HAS_XTS
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struct serpent_xts_ctx {
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struct serpent_ctx tweak_ctx;
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struct serpent_ctx crypt_ctx;
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};
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static int xts_serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct serpent_xts_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 *flags = &tfm->crt_flags;
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int err;
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/* key consists of keys of equal size concatenated, therefore
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* the length must be even
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*/
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if (keylen % 2) {
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*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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/* first half of xts-key is for crypt */
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err = __serpent_setkey(&ctx->crypt_ctx, key, keylen / 2);
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if (err)
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return err;
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/* second half of xts-key is for tweak */
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return __serpent_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
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}
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static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->crypt_ctx,
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.fpu_enabled = false,
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};
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struct xts_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.tweak_ctx = &ctx->tweak_ctx,
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.tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = encrypt_callback,
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};
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int ret;
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ret = xts_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
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struct scatterlist *src, unsigned int nbytes)
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{
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struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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be128 buf[SERPENT_PARALLEL_BLOCKS];
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struct crypt_priv crypt_ctx = {
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.ctx = &ctx->crypt_ctx,
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.fpu_enabled = false,
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};
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struct xts_crypt_req req = {
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.tbuf = buf,
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.tbuflen = sizeof(buf),
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.tweak_ctx = &ctx->tweak_ctx,
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.tweak_fn = XTS_TWEAK_CAST(__serpent_encrypt),
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.crypt_ctx = &crypt_ctx,
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.crypt_fn = decrypt_callback,
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};
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int ret;
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ret = xts_crypt(desc, dst, src, nbytes, &req);
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serpent_fpu_end(crypt_ctx.fpu_enabled);
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return ret;
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}
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static struct crypto_alg blk_xts_alg = {
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.cra_name = "__xts-serpent-sse2",
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.cra_driver_name = "__driver-xts-serpent-sse2",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_xts_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(blk_xts_alg.cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE * 2,
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.max_keysize = SERPENT_MAX_KEY_SIZE * 2,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = xts_serpent_setkey,
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.encrypt = xts_encrypt,
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.decrypt = xts_decrypt,
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},
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},
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};
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#endif
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static int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int key_len)
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{
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@ -851,6 +968,46 @@ static struct crypto_alg ablk_lrw_alg = {
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#endif
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#ifdef HAS_XTS
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static int ablk_xts_init(struct crypto_tfm *tfm)
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{
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struct cryptd_ablkcipher *cryptd_tfm;
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cryptd_tfm = cryptd_alloc_ablkcipher("__driver-xts-serpent-sse2", 0, 0);
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if (IS_ERR(cryptd_tfm))
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return PTR_ERR(cryptd_tfm);
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ablk_init_common(tfm, cryptd_tfm);
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return 0;
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}
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static struct crypto_alg ablk_xts_alg = {
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.cra_name = "xts(serpent)",
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.cra_driver_name = "xts-serpent-sse2",
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.cra_priority = 400,
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.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct async_serpent_ctx),
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.cra_alignmask = 0,
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.cra_type = &crypto_ablkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(ablk_xts_alg.cra_list),
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.cra_init = ablk_xts_init,
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.cra_exit = ablk_exit,
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.cra_u = {
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.ablkcipher = {
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.min_keysize = SERPENT_MIN_KEY_SIZE * 2,
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.max_keysize = SERPENT_MAX_KEY_SIZE * 2,
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.ivsize = SERPENT_BLOCK_SIZE,
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.setkey = ablk_set_key,
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.encrypt = ablk_encrypt,
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.decrypt = ablk_decrypt,
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},
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},
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};
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#endif
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static int __init serpent_sse2_init(void)
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{
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int err;
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@ -885,15 +1042,30 @@ static int __init serpent_sse2_init(void)
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err = crypto_register_alg(&ablk_lrw_alg);
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if (err)
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goto ablk_lrw_err;
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#endif
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#ifdef HAS_XTS
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err = crypto_register_alg(&blk_xts_alg);
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if (err)
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goto blk_xts_err;
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err = crypto_register_alg(&ablk_xts_alg);
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if (err)
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goto ablk_xts_err;
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#endif
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return err;
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#ifdef HAS_XTS
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crypto_unregister_alg(&ablk_xts_alg);
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ablk_xts_err:
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crypto_unregister_alg(&blk_xts_alg);
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blk_xts_err:
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#endif
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#ifdef HAS_LRW
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crypto_unregister_alg(&ablk_lrw_alg);
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ablk_lrw_err:
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crypto_unregister_alg(&blk_lrw_alg);
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blk_lrw_err:
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crypto_unregister_alg(&ablk_ctr_alg);
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#endif
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crypto_unregister_alg(&ablk_ctr_alg);
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ablk_ctr_err:
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crypto_unregister_alg(&ablk_cbc_alg);
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ablk_cbc_err:
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@ -910,6 +1082,10 @@ blk_ecb_err:
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static void __exit serpent_sse2_exit(void)
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{
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#ifdef HAS_XTS
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crypto_unregister_alg(&ablk_xts_alg);
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crypto_unregister_alg(&blk_xts_alg);
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#endif
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#ifdef HAS_LRW
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crypto_unregister_alg(&ablk_lrw_alg);
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crypto_unregister_alg(&blk_lrw_alg);
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