/* * 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/err.h>#include <linux/errno.h>#include <linux/kernel.h>#include <linux/kmod.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);EXPORT_SYMBOL_GPL(crypto_alg_list);DECLARE_RWSEM(crypto_alg_sem);EXPORT_SYMBOL_GPL(crypto_alg_sem); BLOCKING_NOTIFIER_HEAD(crypto_chain);EXPORT_SYMBOL_GPL(crypto_chain); static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg){ atomic_inc(&alg->cra_refcnt); return alg;} struct crypto_alg *crypto_mod_get(struct crypto_alg *alg){ return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;}EXPORT_SYMBOL_GPL(crypto_mod_get); void crypto_mod_put(struct crypto_alg *alg){ struct module *module = alg->cra_module; crypto_alg_put(alg); module_put(module);}EXPORT_SYMBOL_GPL(crypto_mod_put); static inline int crypto_is_test_larval(struct crypto_larval *larval){ return larval->alg.cra_driver_name[0];} 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 (crypto_is_moribund(q)) continue; if ((q->cra_flags ^ type) & mask) continue; if (crypto_is_larval(q) && !crypto_is_test_larval((struct crypto_larval *)q) && ((struct crypto_larval *)q)->mask != 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_mod_get(q))) continue; best = q->cra_priority; if (alg) crypto_mod_put(alg); alg = q; if (exact) break; } return alg;} static void crypto_larval_destroy(struct crypto_alg *alg){ struct crypto_larval *larval = (void *)alg; BUG_ON(!crypto_is_larval(alg)); if (larval->adult) crypto_mod_put(larval->adult); kfree(larval);} struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask){ struct crypto_larval *larval; larval = kzalloc(sizeof(*larval), GFP_KERNEL); if (!larval) return ERR_PTR(-ENOMEM); larval->mask = mask; larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type; larval->alg.cra_priority = -1; larval->alg.cra_destroy = crypto_larval_destroy; strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME); init_completion(&larval->completion); return larval;}EXPORT_SYMBOL_GPL(crypto_larval_alloc); static struct crypto_alg *crypto_larval_add(const char *name, u32 type, u32 mask){ struct crypto_alg *alg; struct crypto_larval *larval; larval = crypto_larval_alloc(name, type, mask); if (IS_ERR(larval)) return ERR_CAST(larval); atomic_set(&larval->alg.cra_refcnt, 2); down_write(&crypto_alg_sem); alg = __crypto_alg_lookup(name, type, mask); if (!alg) { alg = &larval->alg; list_add(&alg->cra_list, &crypto_alg_list); } up_write(&crypto_alg_sem); if (alg != &larval->alg) kfree(larval); return alg;} void crypto_larval_kill(struct crypto_alg *alg){ struct crypto_larval *larval = (void *)alg; down_write(&crypto_alg_sem); list_del(&alg->cra_list); up_write(&crypto_alg_sem); complete_all(&larval->completion); crypto_alg_put(alg);}EXPORT_SYMBOL_GPL(crypto_larval_kill); static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg){ struct crypto_larval *larval = (void *)alg; long timeout; timeout = wait_for_completion_interruptible_timeout( &larval->completion, 60 * HZ); alg = larval->adult; if (timeout < 0) alg = ERR_PTR(-EINTR); else if (!timeout) alg = ERR_PTR(-ETIMEDOUT); else if (!alg) alg = ERR_PTR(-ENOENT); else if (crypto_is_test_larval(larval) && !(alg->cra_flags & CRYPTO_ALG_TESTED)) alg = ERR_PTR(-EAGAIN); else if (!crypto_mod_get(alg)) alg = ERR_PTR(-EAGAIN); crypto_mod_put(&larval->alg); return alg;} struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask){ struct crypto_alg *alg; down_read(&crypto_alg_sem); alg = __crypto_alg_lookup(name, type, mask); up_read(&crypto_alg_sem); return alg;}EXPORT_SYMBOL_GPL(crypto_alg_lookup); struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask){ struct crypto_alg *alg; if (!name) return ERR_PTR(-ENOENT); mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD); type &= mask; alg = crypto_alg_lookup(name, type, mask); if (!alg) { request_module("%s", name); if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask & CRYPTO_ALG_NEED_FALLBACK)) request_module("%s-all", name); alg = crypto_alg_lookup(name, type, mask); } if (alg) return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg; return crypto_larval_add(name, type, mask);}EXPORT_SYMBOL_GPL(crypto_larval_lookup); int crypto_probing_notify(unsigned long val, void *v){ int ok; ok = blocking_notifier_call_chain(&crypto_chain, val, v); if (ok == NOTIFY_DONE) { request_module("cryptomgr"); ok = blocking_notifier_call_chain(&crypto_chain, val, v); } return ok;}EXPORT_SYMBOL_GPL(crypto_probing_notify); struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask){ struct crypto_alg *alg; struct crypto_alg *larval; int ok; if (!((type | mask) & CRYPTO_ALG_TESTED)) { type |= CRYPTO_ALG_TESTED; mask |= CRYPTO_ALG_TESTED; } larval = crypto_larval_lookup(name, type, mask); if (IS_ERR(larval) || !crypto_is_larval(larval)) return larval; ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval); if (ok == NOTIFY_STOP) alg = crypto_larval_wait(larval); else { crypto_mod_put(larval); alg = ERR_PTR(-ENOENT); } crypto_larval_kill(larval); return alg;}EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup); 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); case CRYPTO_ALG_TYPE_COMPRESS: return crypto_init_compress_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; case CRYPTO_ALG_TYPE_COMPRESS: crypto_exit_compress_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; case CRYPTO_ALG_TYPE_COMPRESS: len += crypto_compress_ctxsize(alg); break; } return len;} void crypto_shoot_alg(struct crypto_alg *alg){ down_write(&crypto_alg_sem); alg->cra_flags |= CRYPTO_ALG_DYING; up_write(&crypto_alg_sem);}EXPORT_SYMBOL_GPL(crypto_shoot_alg); 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: if (err == -EAGAIN) crypto_shoot_alg(alg); kfree(tfm);out_err: tfm = ERR_PTR(err);out: return tfm;}EXPORT_SYMBOL_GPL(__crypto_alloc_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. * Plesae 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_tfm *tfm; int err; for (;;) { struct crypto_alg *alg; alg = crypto_alg_mod_lookup(alg_name, type, mask); if (IS_ERR(alg)) { err = PTR_ERR(alg); goto err; } tfm = __crypto_alloc_tfm(alg, type, mask); if (!IS_ERR(tfm)) return tfm; crypto_mod_put(alg); err = PTR_ERR(tfm); err: if (err != -EAGAIN) break; if (signal_pending(current)) { err = -EINTR; break; } } return ERR_PTR(err);}EXPORT_SYMBOL_GPL(crypto_alloc_base); 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: if (err == -EAGAIN) crypto_shoot_alg(alg); kfree(mem);out_err: mem = ERR_PTR(err);out: return mem;}EXPORT_SYMBOL_GPL(crypto_create_tfm); 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;Lines 1–500 of 606. Load more
/* * 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/err.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/kmod.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); EXPORT_SYMBOL_GPL(crypto_alg_list); DECLARE_RWSEM(crypto_alg_sem); EXPORT_SYMBOL_GPL(crypto_alg_sem); BLOCKING_NOTIFIER_HEAD(crypto_chain); EXPORT_SYMBOL_GPL(crypto_chain); static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg) { atomic_inc(&alg->cra_refcnt); return alg; } struct crypto_alg *crypto_mod_get(struct crypto_alg *alg) { return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL; } EXPORT_SYMBOL_GPL(crypto_mod_get); void crypto_mod_put(struct crypto_alg *alg) { struct module *module = alg->cra_module; crypto_alg_put(alg); module_put(module); } EXPORT_SYMBOL_GPL(crypto_mod_put); static inline int crypto_is_test_larval(struct crypto_larval *larval) { return larval->alg.cra_driver_name[0]; } 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 (crypto_is_moribund(q)) continue; if ((q->cra_flags ^ type) & mask) continue; if (crypto_is_larval(q) && !crypto_is_test_larval((struct crypto_larval *)q) && ((struct crypto_larval *)q)->mask != 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_mod_get(q))) continue; best = q->cra_priority; if (alg) crypto_mod_put(alg); alg = q; if (exact) break; } return alg; } static void crypto_larval_destroy(struct crypto_alg *alg) { struct crypto_larval *larval = (void *)alg; BUG_ON(!crypto_is_larval(alg)); if (larval->adult) crypto_mod_put(larval->adult); kfree(larval); } struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask) { struct crypto_larval *larval; larval = kzalloc(sizeof(*larval), GFP_KERNEL); if (!larval) return ERR_PTR(-ENOMEM); larval->mask = mask; larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type; larval->alg.cra_priority = -1; larval->alg.cra_destroy = crypto_larval_destroy; strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME); init_completion(&larval->completion); return larval; } EXPORT_SYMBOL_GPL(crypto_larval_alloc); static struct crypto_alg *crypto_larval_add(const char *name, u32 type, u32 mask) { struct crypto_alg *alg; struct crypto_larval *larval; larval = crypto_larval_alloc(name, type, mask); if (IS_ERR(larval)) return ERR_CAST(larval); atomic_set(&larval->alg.cra_refcnt, 2); down_write(&crypto_alg_sem); alg = __crypto_alg_lookup(name, type, mask); if (!alg) { alg = &larval->alg; list_add(&alg->cra_list, &crypto_alg_list); } up_write(&crypto_alg_sem); if (alg != &larval->alg) kfree(larval); return alg; } void crypto_larval_kill(struct crypto_alg *alg) { struct crypto_larval *larval = (void *)alg; down_write(&crypto_alg_sem); list_del(&alg->cra_list); up_write(&crypto_alg_sem); complete_all(&larval->completion); crypto_alg_put(alg); } EXPORT_SYMBOL_GPL(crypto_larval_kill); static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg) { struct crypto_larval *larval = (void *)alg; long timeout; timeout = wait_for_completion_interruptible_timeout( &larval->completion, 60 * HZ); alg = larval->adult; if (timeout < 0) alg = ERR_PTR(-EINTR); else if (!timeout) alg = ERR_PTR(-ETIMEDOUT); else if (!alg) alg = ERR_PTR(-ENOENT); else if (crypto_is_test_larval(larval) && !(alg->cra_flags & CRYPTO_ALG_TESTED)) alg = ERR_PTR(-EAGAIN); else if (!crypto_mod_get(alg)) alg = ERR_PTR(-EAGAIN); crypto_mod_put(&larval->alg); return alg; } struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask) { struct crypto_alg *alg; down_read(&crypto_alg_sem); alg = __crypto_alg_lookup(name, type, mask); up_read(&crypto_alg_sem); return alg; } EXPORT_SYMBOL_GPL(crypto_alg_lookup); struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask) { struct crypto_alg *alg; if (!name) return ERR_PTR(-ENOENT); mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD); type &= mask; alg = crypto_alg_lookup(name, type, mask); if (!alg) { request_module("%s", name); if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask & CRYPTO_ALG_NEED_FALLBACK)) request_module("%s-all", name); alg = crypto_alg_lookup(name, type, mask); } if (alg) return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg; return crypto_larval_add(name, type, mask); } EXPORT_SYMBOL_GPL(crypto_larval_lookup); int crypto_probing_notify(unsigned long val, void *v) { int ok; ok = blocking_notifier_call_chain(&crypto_chain, val, v); if (ok == NOTIFY_DONE) { request_module("cryptomgr"); ok = blocking_notifier_call_chain(&crypto_chain, val, v); } return ok; } EXPORT_SYMBOL_GPL(crypto_probing_notify); struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask) { struct crypto_alg *alg; struct crypto_alg *larval; int ok; if (!((type | mask) & CRYPTO_ALG_TESTED)) { type |= CRYPTO_ALG_TESTED; mask |= CRYPTO_ALG_TESTED; } larval = crypto_larval_lookup(name, type, mask); if (IS_ERR(larval) || !crypto_is_larval(larval)) return larval; ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval); if (ok == NOTIFY_STOP) alg = crypto_larval_wait(larval); else { crypto_mod_put(larval); alg = ERR_PTR(-ENOENT); } crypto_larval_kill(larval); return alg; } EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup); 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); case CRYPTO_ALG_TYPE_COMPRESS: return crypto_init_compress_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; case CRYPTO_ALG_TYPE_COMPRESS: crypto_exit_compress_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; case CRYPTO_ALG_TYPE_COMPRESS: len += crypto_compress_ctxsize(alg); break; } return len; } void crypto_shoot_alg(struct crypto_alg *alg) { down_write(&crypto_alg_sem); alg->cra_flags |= CRYPTO_ALG_DYING; up_write(&crypto_alg_sem); } EXPORT_SYMBOL_GPL(crypto_shoot_alg); 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: if (err == -EAGAIN) crypto_shoot_alg(alg); kfree(tfm); out_err: tfm = ERR_PTR(err); out: return tfm; } EXPORT_SYMBOL_GPL(__crypto_alloc_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. * Plesae 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_tfm *tfm; int err; for (;;) { struct crypto_alg *alg; alg = crypto_alg_mod_lookup(alg_name, type, mask); if (IS_ERR(alg)) { err = PTR_ERR(alg); goto err; } tfm = __crypto_alloc_tfm(alg, type, mask); if (!IS_ERR(tfm)) return tfm; crypto_mod_put(alg); err = PTR_ERR(tfm); err: if (err != -EAGAIN) break; if (signal_pending(current)) { err = -EINTR; break; } } return ERR_PTR(err); } EXPORT_SYMBOL_GPL(crypto_alloc_base); 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: if (err == -EAGAIN) crypto_shoot_alg(alg); kfree(mem); out_err: mem = ERR_PTR(err); out: return mem; } EXPORT_SYMBOL_GPL(crypto_create_tfm); 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;