diff options
| -rw-r--r-- | crypto/xts.c | 137 |
1 files changed, 72 insertions, 65 deletions
diff --git a/crypto/xts.c b/crypto/xts.c index 9a7adab6c3e1..3c3ed02c7663 100644 --- a/crypto/xts.c +++ b/crypto/xts.c @@ -20,7 +20,7 @@ #include <crypto/b128ops.h> #include <crypto/gf128mul.h> -struct priv { +struct xts_tfm_ctx { struct crypto_skcipher *child; struct crypto_cipher *tweak; }; @@ -30,17 +30,17 @@ struct xts_instance_ctx { char name[CRYPTO_MAX_ALG_NAME]; }; -struct rctx { +struct xts_request_ctx { le128 t; struct scatterlist *tail; struct scatterlist sg[2]; struct skcipher_request subreq; }; -static int setkey(struct crypto_skcipher *parent, const u8 *key, - unsigned int keylen) +static int xts_setkey(struct crypto_skcipher *parent, const u8 *key, + unsigned int keylen) { - struct priv *ctx = crypto_skcipher_ctx(parent); + struct xts_tfm_ctx *ctx = crypto_skcipher_ctx(parent); struct crypto_skcipher *child; struct crypto_cipher *tweak; int err; @@ -78,9 +78,10 @@ static int setkey(struct crypto_skcipher *parent, const u8 *key, * mutliple calls to the 'ecb(..)' instance, which usually would be slower than * just doing the gf128mul_x_ble() calls again. */ -static int xor_tweak(struct skcipher_request *req, bool second_pass, bool enc) +static int xts_xor_tweak(struct skcipher_request *req, bool second_pass, + bool enc) { - struct rctx *rctx = skcipher_request_ctx(req); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); const bool cts = (req->cryptlen % XTS_BLOCK_SIZE); const int bs = XTS_BLOCK_SIZE; @@ -128,23 +129,23 @@ static int xor_tweak(struct skcipher_request *req, bool second_pass, bool enc) return err; } -static int xor_tweak_pre(struct skcipher_request *req, bool enc) +static int xts_xor_tweak_pre(struct skcipher_request *req, bool enc) { - return xor_tweak(req, false, enc); + return xts_xor_tweak(req, false, enc); } -static int xor_tweak_post(struct skcipher_request *req, bool enc) +static int xts_xor_tweak_post(struct skcipher_request *req, bool enc) { - return xor_tweak(req, true, enc); + return xts_xor_tweak(req, true, enc); } -static void cts_done(struct crypto_async_request *areq, int err) +static void xts_cts_done(struct crypto_async_request *areq, int err) { struct skcipher_request *req = areq->data; le128 b; if (!err) { - struct rctx *rctx = skcipher_request_ctx(req); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); scatterwalk_map_and_copy(&b, rctx->tail, 0, XTS_BLOCK_SIZE, 0); le128_xor(&b, &rctx->t, &b); @@ -154,12 +155,13 @@ static void cts_done(struct crypto_async_request *areq, int err) skcipher_request_complete(req, err); } -static int cts_final(struct skcipher_request *req, - int (*crypt)(struct skcipher_request *req)) +static int xts_cts_final(struct skcipher_request *req, + int (*crypt)(struct skcipher_request *req)) { - struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); + const struct xts_tfm_ctx *ctx = + crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); int offset = req->cryptlen & ~(XTS_BLOCK_SIZE - 1); - struct rctx *rctx = skcipher_request_ctx(req); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq = &rctx->subreq; int tail = req->cryptlen % XTS_BLOCK_SIZE; le128 b[2]; @@ -177,7 +179,8 @@ static int cts_final(struct skcipher_request *req, scatterwalk_map_and_copy(b, rctx->tail, 0, XTS_BLOCK_SIZE + tail, 1); skcipher_request_set_tfm(subreq, ctx->child); - skcipher_request_set_callback(subreq, req->base.flags, cts_done, req); + skcipher_request_set_callback(subreq, req->base.flags, xts_cts_done, + req); skcipher_request_set_crypt(subreq, rctx->tail, rctx->tail, XTS_BLOCK_SIZE, NULL); @@ -192,18 +195,18 @@ static int cts_final(struct skcipher_request *req, return 0; } -static void encrypt_done(struct crypto_async_request *areq, int err) +static void xts_encrypt_done(struct crypto_async_request *areq, int err) { struct skcipher_request *req = areq->data; if (!err) { - struct rctx *rctx = skcipher_request_ctx(req); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); rctx->subreq.base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - err = xor_tweak_post(req, true); + err = xts_xor_tweak_post(req, true); if (!err && unlikely(req->cryptlen % XTS_BLOCK_SIZE)) { - err = cts_final(req, crypto_skcipher_encrypt); + err = xts_cts_final(req, crypto_skcipher_encrypt); if (err == -EINPROGRESS) return; } @@ -212,18 +215,18 @@ static void encrypt_done(struct crypto_async_request *areq, int err) skcipher_request_complete(req, err); } -static void decrypt_done(struct crypto_async_request *areq, int err) +static void xts_decrypt_done(struct crypto_async_request *areq, int err) { struct skcipher_request *req = areq->data; if (!err) { - struct rctx *rctx = skcipher_request_ctx(req); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); rctx->subreq.base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - err = xor_tweak_post(req, false); + err = xts_xor_tweak_post(req, false); if (!err && unlikely(req->cryptlen % XTS_BLOCK_SIZE)) { - err = cts_final(req, crypto_skcipher_decrypt); + err = xts_cts_final(req, crypto_skcipher_decrypt); if (err == -EINPROGRESS) return; } @@ -232,10 +235,12 @@ static void decrypt_done(struct crypto_async_request *areq, int err) skcipher_request_complete(req, err); } -static int init_crypt(struct skcipher_request *req, crypto_completion_t compl) +static int xts_init_crypt(struct skcipher_request *req, + crypto_completion_t compl) { - struct priv *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); - struct rctx *rctx = skcipher_request_ctx(req); + const struct xts_tfm_ctx *ctx = + crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq = &rctx->subreq; if (req->cryptlen < XTS_BLOCK_SIZE) @@ -252,45 +257,45 @@ static int init_crypt(struct skcipher_request *req, crypto_completion_t compl) return 0; } -static int encrypt(struct skcipher_request *req) +static int xts_encrypt(struct skcipher_request *req) { - struct rctx *rctx = skcipher_request_ctx(req); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq = &rctx->subreq; int err; - err = init_crypt(req, encrypt_done) ?: - xor_tweak_pre(req, true) ?: + err = xts_init_crypt(req, xts_encrypt_done) ?: + xts_xor_tweak_pre(req, true) ?: crypto_skcipher_encrypt(subreq) ?: - xor_tweak_post(req, true); + xts_xor_tweak_post(req, true); if (err || likely((req->cryptlen % XTS_BLOCK_SIZE) == 0)) return err; - return cts_final(req, crypto_skcipher_encrypt); + return xts_cts_final(req, crypto_skcipher_encrypt); } -static int decrypt(struct skcipher_request *req) +static int xts_decrypt(struct skcipher_request *req) { - struct rctx *rctx = skcipher_request_ctx(req); + struct xts_request_ctx *rctx = skcipher_request_ctx(req); struct skcipher_request *subreq = &rctx->subreq; int err; - err = init_crypt(req, decrypt_done) ?: - xor_tweak_pre(req, false) ?: + err = xts_init_crypt(req, xts_decrypt_done) ?: + xts_xor_tweak_pre(req, false) ?: crypto_skcipher_decrypt(subreq) ?: - xor_tweak_post(req, false); + xts_xor_tweak_post(req, false); if (err || likely((req->cryptlen % XTS_BLOCK_SIZE) == 0)) return err; - return cts_final(req, crypto_skcipher_decrypt); + return xts_cts_final(req, crypto_skcipher_decrypt); } -static int init_tfm(struct crypto_skcipher *tfm) +static int xts_init_tfm(struct crypto_skcipher *tfm) { struct skcipher_instance *inst = skcipher_alg_instance(tfm); struct xts_instance_ctx *ictx = skcipher_instance_ctx(inst); - struct priv *ctx = crypto_skcipher_ctx(tfm); + struct xts_tfm_ctx *ctx = crypto_skcipher_ctx(tfm); struct crypto_skcipher *child; struct crypto_cipher *tweak; @@ -309,26 +314,28 @@ static int init_tfm(struct crypto_skcipher *tfm) ctx->tweak = tweak; crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(child) + - sizeof(struct rctx)); + sizeof(struct xts_request_ctx)); return 0; } -static void exit_tfm(struct crypto_skcipher *tfm) +static void xts_exit_tfm(struct crypto_skcipher *tfm) { - struct priv *ctx = crypto_skcipher_ctx(tfm); + struct xts_tfm_ctx *ctx = crypto_skcipher_ctx(tfm); crypto_free_skcipher(ctx->child); crypto_free_cipher(ctx->tweak); } -static void crypto_xts_free(struct skcipher_instance *inst) +static void xts_free_instance(struct skcipher_instance *inst) { - crypto_drop_skcipher(skcipher_instance_ctx(inst)); + struct xts_instance_ctx *ictx = skcipher_instance_ctx(inst); + + crypto_drop_skcipher(&ictx->spawn); kfree(inst); } -static int create(struct crypto_template *tmpl, struct rtattr **tb) +static int xts_create(struct crypto_template *tmpl, struct rtattr **tb) { struct skcipher_instance *inst; struct xts_instance_ctx *ctx; @@ -416,43 +423,43 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb) inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg) * 2; inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg) * 2; - inst->alg.base.cra_ctxsize = sizeof(struct priv); + inst->alg.base.cra_ctxsize = sizeof(struct xts_tfm_ctx); - inst->alg.init = init_tfm; - inst->alg.exit = exit_tfm; + inst->alg.init = xts_init_tfm; + inst->alg.exit = xts_exit_tfm; - inst->alg.setkey = setkey; - inst->alg.encrypt = encrypt; - inst->alg.decrypt = decrypt; + inst->alg.setkey = xts_setkey; + inst->alg.encrypt = xts_encrypt; + inst->alg.decrypt = xts_decrypt; - inst->free = crypto_xts_free; + inst->free = xts_free_instance; err = skcipher_register_instance(tmpl, inst); if (err) { err_free_inst: - crypto_xts_free(inst); + xts_free_instance(inst); } return err; } -static struct crypto_template crypto_tmpl = { +static struct crypto_template xts_tmpl = { .name = "xts", - .create = create, + .create = xts_create, .module = THIS_MODULE, }; -static int __init crypto_module_init(void) +static int __init xts_module_init(void) { - return crypto_register_template(&crypto_tmpl); + return crypto_register_template(&xts_tmpl); } -static void __exit crypto_module_exit(void) +static void __exit xts_module_exit(void) { - crypto_unregister_template(&crypto_tmpl); + crypto_unregister_template(&xts_tmpl); } -subsys_initcall(crypto_module_init); -module_exit(crypto_module_exit); +subsys_initcall(xts_module_init); +module_exit(xts_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("XTS block cipher mode"); |