diff options
| -rw-r--r-- | crypto/cbc.c | 131 |
1 files changed, 13 insertions, 118 deletions
diff --git a/crypto/cbc.c b/crypto/cbc.c index dd5f332fd566..d12efaac9230 100644 --- a/crypto/cbc.c +++ b/crypto/cbc.c @@ -18,34 +18,11 @@ #include <linux/kernel.h> #include <linux/log2.h> #include <linux/module.h> -#include <linux/slab.h> - -struct crypto_cbc_ctx { - struct crypto_cipher *child; -}; - -static int crypto_cbc_setkey(struct crypto_skcipher *parent, const u8 *key, - unsigned int keylen) -{ - struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(parent); - struct crypto_cipher *child = ctx->child; - int err; - - crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); - crypto_cipher_set_flags(child, crypto_skcipher_get_flags(parent) & - CRYPTO_TFM_REQ_MASK); - err = crypto_cipher_setkey(child, key, keylen); - crypto_skcipher_set_flags(parent, crypto_cipher_get_flags(child) & - CRYPTO_TFM_RES_MASK); - return err; -} static inline void crypto_cbc_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst) { - struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); - - crypto_cipher_encrypt_one(ctx->child, dst, src); + crypto_cipher_encrypt_one(skcipher_cipher_simple(tfm), dst, src); } static int crypto_cbc_encrypt(struct skcipher_request *req) @@ -56,9 +33,7 @@ static int crypto_cbc_encrypt(struct skcipher_request *req) static inline void crypto_cbc_decrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst) { - struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); - - crypto_cipher_decrypt_one(ctx->child, dst, src); + crypto_cipher_decrypt_one(skcipher_cipher_simple(tfm), dst, src); } static int crypto_cbc_decrypt(struct skcipher_request *req) @@ -78,113 +53,33 @@ static int crypto_cbc_decrypt(struct skcipher_request *req) return err; } -static int crypto_cbc_init_tfm(struct crypto_skcipher *tfm) -{ - struct skcipher_instance *inst = skcipher_alg_instance(tfm); - struct crypto_spawn *spawn = skcipher_instance_ctx(inst); - struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); - struct crypto_cipher *cipher; - - cipher = crypto_spawn_cipher(spawn); - if (IS_ERR(cipher)) - return PTR_ERR(cipher); - - ctx->child = cipher; - return 0; -} - -static void crypto_cbc_exit_tfm(struct crypto_skcipher *tfm) -{ - struct crypto_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); - - crypto_free_cipher(ctx->child); -} - -static void crypto_cbc_free(struct skcipher_instance *inst) -{ - crypto_drop_skcipher(skcipher_instance_ctx(inst)); - kfree(inst); -} - static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb) { struct skcipher_instance *inst; - struct crypto_attr_type *algt; - struct crypto_spawn *spawn; struct crypto_alg *alg; - u32 mask; int err; - err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER); - if (err) - return err; - - inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); - if (!inst) - return -ENOMEM; - - algt = crypto_get_attr_type(tb); - err = PTR_ERR(algt); - if (IS_ERR(algt)) - goto err_free_inst; - - mask = CRYPTO_ALG_TYPE_MASK | - crypto_requires_off(algt->type, algt->mask, - CRYPTO_ALG_NEED_FALLBACK); - - alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, mask); - err = PTR_ERR(alg); - if (IS_ERR(alg)) - goto err_free_inst; - - spawn = skcipher_instance_ctx(inst); - err = crypto_init_spawn(spawn, alg, skcipher_crypto_instance(inst), - CRYPTO_ALG_TYPE_MASK); - if (err) - goto err_put_alg; - - err = crypto_inst_setname(skcipher_crypto_instance(inst), "cbc", alg); - if (err) - goto err_drop_spawn; + inst = skcipher_alloc_instance_simple(tmpl, tb, &alg); + if (IS_ERR(inst)) + return PTR_ERR(inst); err = -EINVAL; if (!is_power_of_2(alg->cra_blocksize)) - goto err_drop_spawn; - - inst->alg.base.cra_priority = alg->cra_priority; - inst->alg.base.cra_blocksize = alg->cra_blocksize; - inst->alg.base.cra_alignmask = alg->cra_alignmask; - - inst->alg.ivsize = alg->cra_blocksize; - inst->alg.min_keysize = alg->cra_cipher.cia_min_keysize; - inst->alg.max_keysize = alg->cra_cipher.cia_max_keysize; - - inst->alg.base.cra_ctxsize = sizeof(struct crypto_cbc_ctx); - - inst->alg.init = crypto_cbc_init_tfm; - inst->alg.exit = crypto_cbc_exit_tfm; + goto out_free_inst; - inst->alg.setkey = crypto_cbc_setkey; inst->alg.encrypt = crypto_cbc_encrypt; inst->alg.decrypt = crypto_cbc_decrypt; - inst->free = crypto_cbc_free; - err = skcipher_register_instance(tmpl, inst); if (err) - goto err_drop_spawn; - crypto_mod_put(alg); + goto out_free_inst; + goto out_put_alg; -out: - return err; - -err_drop_spawn: - crypto_drop_spawn(spawn); -err_put_alg: +out_free_inst: + inst->free(inst); +out_put_alg: crypto_mod_put(alg); -err_free_inst: - kfree(inst); - goto out; + return err; } static struct crypto_template crypto_cbc_tmpl = { @@ -207,5 +102,5 @@ module_init(crypto_cbc_module_init); module_exit(crypto_cbc_module_exit); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("CBC block cipher algorithm"); +MODULE_DESCRIPTION("CBC block cipher mode of operation"); MODULE_ALIAS_CRYPTO("cbc"); |