diff options
author | Kent Overstreet <kent.overstreet@gmail.com> | 2017-01-08 00:13:18 -0900 |
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committer | Kent Overstreet <kent.overstreet@gmail.com> | 2017-01-20 09:07:08 -0900 |
commit | b33fc8298f7e13226b9895abc57c9bfce5e3fa2d (patch) | |
tree | a3d2a5a909b6372f7777c1c5c18cef5f81d123a9 /linux/crypto/api.c | |
parent | 7f4191a202ea4558ca2d5eb8a47daea33c9999c7 (diff) |
bcache in userspace; userspace fsck
Diffstat (limited to 'linux/crypto/api.c')
-rw-r--r-- | linux/crypto/api.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/linux/crypto/api.c b/linux/crypto/api.c new file mode 100644 index 00000000..513a48aa --- /dev/null +++ b/linux/crypto/api.c @@ -0,0 +1,326 @@ +/* + * Scatterlist Cryptographic API. + * + * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> + * Copyright (c) 2002 David S. Miller (davem@redhat.com) + * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> + * + * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no> + * and Nettle, by Niels Möller. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/param.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/string.h> +#include "internal.h" + +LIST_HEAD(crypto_alg_list); +DECLARE_RWSEM(crypto_alg_sem); + +static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, + u32 mask) +{ + struct crypto_alg *q, *alg = NULL; + int best = -2; + + list_for_each_entry(q, &crypto_alg_list, cra_list) { + int exact, fuzzy; + + if ((q->cra_flags ^ type) & mask) + continue; + + exact = !strcmp(q->cra_driver_name, name); + fuzzy = !strcmp(q->cra_name, name); + if (!exact && !(fuzzy && q->cra_priority > best)) + continue; + + if (unlikely(!crypto_alg_get(q))) + continue; + + best = q->cra_priority; + if (alg) + crypto_alg_put(alg); + alg = q; + + if (exact) + break; + } + + return alg; +} + +struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask) +{ + struct crypto_alg *alg; + + /* + * If the internal flag is set for a cipher, require a caller to + * to invoke the cipher with the internal flag to use that cipher. + * Also, if a caller wants to allocate a cipher that may or may + * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and + * !(mask & CRYPTO_ALG_INTERNAL). + */ + if (!((type | mask) & CRYPTO_ALG_INTERNAL)) + mask |= CRYPTO_ALG_INTERNAL; + + down_read(&crypto_alg_sem); + alg = __crypto_alg_lookup(name, type, mask); + up_read(&crypto_alg_sem); + + return alg ?: ERR_PTR(-ENOENT); +} + +static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask) +{ + const struct crypto_type *type_obj = tfm->__crt_alg->cra_type; + + if (type_obj) + return type_obj->init(tfm, type, mask); + + switch (crypto_tfm_alg_type(tfm)) { + case CRYPTO_ALG_TYPE_CIPHER: + return crypto_init_cipher_ops(tfm); + default: + break; + } + + BUG(); + return -EINVAL; +} + +static void crypto_exit_ops(struct crypto_tfm *tfm) +{ + const struct crypto_type *type = tfm->__crt_alg->cra_type; + + if (type) { + if (tfm->exit) + tfm->exit(tfm); + return; + } + + switch (crypto_tfm_alg_type(tfm)) { + case CRYPTO_ALG_TYPE_CIPHER: + crypto_exit_cipher_ops(tfm); + break; + + default: + BUG(); + } +} + +static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) +{ + const struct crypto_type *type_obj = alg->cra_type; + unsigned int len; + + len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1); + if (type_obj) + return len + type_obj->ctxsize(alg, type, mask); + + switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) { + default: + BUG(); + + case CRYPTO_ALG_TYPE_CIPHER: + len += crypto_cipher_ctxsize(alg); + break; + } + + return len; +} + +struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type, + u32 mask) +{ + struct crypto_tfm *tfm = NULL; + unsigned int tfm_size; + int err = -ENOMEM; + + tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask); + tfm = kzalloc(tfm_size, GFP_KERNEL); + if (tfm == NULL) + goto out_err; + + tfm->__crt_alg = alg; + + err = crypto_init_ops(tfm, type, mask); + if (err) + goto out_free_tfm; + + if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm))) + goto cra_init_failed; + + goto out; + +cra_init_failed: + crypto_exit_ops(tfm); +out_free_tfm: + kfree(tfm); +out_err: + tfm = ERR_PTR(err); +out: + return tfm; +} + +/* + * crypto_alloc_base - Locate algorithm and allocate transform + * @alg_name: Name of algorithm + * @type: Type of algorithm + * @mask: Mask for type comparison + * + * This function should not be used by new algorithm types. + * Please use crypto_alloc_tfm instead. + * + * crypto_alloc_base() will first attempt to locate an already loaded + * algorithm. If that fails and the kernel supports dynamically loadable + * modules, it will then attempt to load a module of the same name or + * alias. If that fails it will send a query to any loaded crypto manager + * to construct an algorithm on the fly. A refcount is grabbed on the + * algorithm which is then associated with the new transform. + * + * The returned transform is of a non-determinate type. Most people + * should use one of the more specific allocation functions such as + * crypto_alloc_blkcipher. + * + * In case of error the return value is an error pointer. + */ +struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask) +{ + struct crypto_alg *alg; + struct crypto_tfm *tfm; + + alg = crypto_alg_mod_lookup(alg_name, type, mask); + if (IS_ERR(alg)) { + fprintf(stderr, "unknown cipher %s\n", alg_name); + return ERR_CAST(alg); + } + + tfm = __crypto_alloc_tfm(alg, type, mask); + if (IS_ERR(tfm)) { + crypto_alg_put(alg); + return tfm; + } + + return tfm; +} + +void *crypto_create_tfm(struct crypto_alg *alg, + const struct crypto_type *frontend) +{ + char *mem; + struct crypto_tfm *tfm = NULL; + unsigned int tfmsize; + unsigned int total; + int err = -ENOMEM; + + tfmsize = frontend->tfmsize; + total = tfmsize + sizeof(*tfm) + frontend->extsize(alg); + + mem = kzalloc(total, GFP_KERNEL); + if (mem == NULL) + goto out_err; + + tfm = (struct crypto_tfm *)(mem + tfmsize); + tfm->__crt_alg = alg; + + err = frontend->init_tfm(tfm); + if (err) + goto out_free_tfm; + + if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm))) + goto cra_init_failed; + + goto out; + +cra_init_failed: + crypto_exit_ops(tfm); +out_free_tfm: + kfree(mem); +out_err: + mem = ERR_PTR(err); +out: + return mem; +} + +struct crypto_alg *crypto_find_alg(const char *alg_name, + const struct crypto_type *frontend, + u32 type, u32 mask) +{ + struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) = + crypto_alg_mod_lookup; + + if (frontend) { + type &= frontend->maskclear; + mask &= frontend->maskclear; + type |= frontend->type; + mask |= frontend->maskset; + + if (frontend->lookup) + lookup = frontend->lookup; + } + + return lookup(alg_name, type, mask); +} + +void *crypto_alloc_tfm(const char *alg_name, + const struct crypto_type *frontend, u32 type, u32 mask) +{ + struct crypto_alg *alg; + void *tfm; + + alg = crypto_find_alg(alg_name, frontend, type, mask); + if (IS_ERR(alg)) + return ERR_CAST(alg); + + tfm = crypto_create_tfm(alg, frontend); + if (IS_ERR(tfm)) { + crypto_alg_put(alg); + return tfm; + } + + return tfm; +} + +void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm) +{ + struct crypto_alg *alg; + + if (unlikely(!mem)) + return; + + alg = tfm->__crt_alg; + + if (!tfm->exit && alg->cra_exit) + alg->cra_exit(tfm); + crypto_exit_ops(tfm); + crypto_alg_put(alg); + kzfree(mem); +} + +int crypto_has_alg(const char *name, u32 type, u32 mask) +{ + int ret = 0; + struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask); + + if (!IS_ERR(alg)) { + crypto_alg_put(alg); + ret = 1; + } + + return ret; +} + +MODULE_DESCRIPTION("Cryptographic core API"); +MODULE_LICENSE("GPL"); |