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/*
* Scatterlist Cryptographic API .
*
* Copyright ( c ) 2002 James Morris < jmorris @ intercode . com . au >
* Copyright ( c ) 2002 David S . Miller ( davem @ redhat . com )
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* Copyright ( c ) 2005 Herbert Xu < herbert @ gondor . apana . org . au >
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*
* Portions derived from Cryptoapi , by Alexander Kjeldaas < astor @ fast . no >
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* and Nettle , by Niels Möller .
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*
* 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 .
*
*/
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# include <linux/err.h>
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# include <linux/errno.h>
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# include <linux/kernel.h>
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# include <linux/kmod.h>
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# include <linux/module.h>
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# include <linux/param.h>
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# include <linux/sched.h>
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# include <linux/slab.h>
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# include <linux/string.h>
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# include "internal.h"
LIST_HEAD ( crypto_alg_list ) ;
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EXPORT_SYMBOL_GPL ( crypto_alg_list ) ;
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DECLARE_RWSEM ( crypto_alg_sem ) ;
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EXPORT_SYMBOL_GPL ( crypto_alg_sem ) ;
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BLOCKING_NOTIFIER_HEAD ( crypto_chain ) ;
EXPORT_SYMBOL_GPL ( crypto_chain ) ;
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static inline struct crypto_alg * crypto_alg_get ( struct crypto_alg * alg )
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{
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atomic_inc ( & alg - > cra_refcnt ) ;
return alg ;
}
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struct crypto_alg * crypto_mod_get ( struct crypto_alg * alg )
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{
return try_module_get ( alg - > cra_module ) ? crypto_alg_get ( alg ) : NULL ;
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}
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EXPORT_SYMBOL_GPL ( crypto_mod_get ) ;
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void crypto_mod_put ( struct crypto_alg * alg )
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{
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struct module * module = alg - > cra_module ;
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crypto_alg_put ( alg ) ;
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module_put ( module ) ;
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}
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EXPORT_SYMBOL_GPL ( crypto_mod_put ) ;
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static inline int crypto_is_test_larval ( struct crypto_larval * larval )
{
return larval - > alg . cra_driver_name [ 0 ] ;
}
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static struct crypto_alg * __crypto_alg_lookup ( const char * name , u32 type ,
u32 mask )
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{
struct crypto_alg * q , * alg = NULL ;
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int best = - 2 ;
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list_for_each_entry ( q , & crypto_alg_list , cra_list ) {
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int exact , fuzzy ;
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if ( crypto_is_moribund ( q ) )
continue ;
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if ( ( q - > cra_flags ^ type ) & mask )
continue ;
if ( crypto_is_larval ( q ) & &
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! crypto_is_test_larval ( ( struct crypto_larval * ) q ) & &
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( ( struct crypto_larval * ) q ) - > mask ! = mask )
continue ;
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exact = ! strcmp ( q - > cra_driver_name , name ) ;
fuzzy = ! strcmp ( q - > cra_name , name ) ;
if ( ! exact & & ! ( fuzzy & & q - > cra_priority > best ) )
continue ;
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if ( unlikely ( ! crypto_mod_get ( q ) ) )
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continue ;
best = q - > cra_priority ;
if ( alg )
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crypto_mod_put ( alg ) ;
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alg = q ;
if ( exact )
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break ;
}
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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 ) ;
}
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struct crypto_larval * crypto_larval_alloc ( const char * name , u32 type , u32 mask )
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{
struct crypto_larval * larval ;
larval = kzalloc ( sizeof ( * larval ) , GFP_KERNEL ) ;
if ( ! larval )
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return ERR_PTR ( - ENOMEM ) ;
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larval - > mask = mask ;
larval - > alg . cra_flags = CRYPTO_ALG_LARVAL | type ;
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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 ) ;
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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 ) ;
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down_write ( & crypto_alg_sem ) ;
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alg = __crypto_alg_lookup ( name , type , mask ) ;
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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 ;
}
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void crypto_larval_kill ( struct crypto_alg * alg )
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{
struct crypto_larval * larval = ( void * ) alg ;
down_write ( & crypto_alg_sem ) ;
list_del ( & alg - > cra_list ) ;
up_write ( & crypto_alg_sem ) ;
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complete_all ( & larval - > completion ) ;
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crypto_alg_put ( alg ) ;
}
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EXPORT_SYMBOL_GPL ( crypto_larval_kill ) ;
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static struct crypto_alg * crypto_larval_wait ( struct crypto_alg * alg )
{
struct crypto_larval * larval = ( void * ) alg ;
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long timeout ;
timeout = wait_for_completion_interruptible_timeout (
& larval - > completion , 60 * HZ ) ;
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alg = larval - > adult ;
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if ( timeout < 0 )
alg = ERR_PTR ( - EINTR ) ;
else if ( ! timeout )
alg = ERR_PTR ( - ETIMEDOUT ) ;
else if ( ! alg )
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alg = ERR_PTR ( - ENOENT ) ;
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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 ) ;
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crypto_mod_put ( & larval - > alg ) ;
return alg ;
}
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struct crypto_alg * crypto_alg_lookup ( const char * name , u32 type , u32 mask )
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{
struct crypto_alg * alg ;
down_read ( & crypto_alg_sem ) ;
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alg = __crypto_alg_lookup ( name , type , mask ) ;
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up_read ( & crypto_alg_sem ) ;
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return alg ;
}
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EXPORT_SYMBOL_GPL ( crypto_alg_lookup ) ;
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struct crypto_alg * crypto_larval_lookup ( const char * name , u32 type , u32 mask )
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{
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struct crypto_alg * alg ;
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if ( ! name )
return ERR_PTR ( - ENOENT ) ;
mask & = ~ ( CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD ) ;
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type & = mask ;
alg = try_then_request_module ( crypto_alg_lookup ( name , type , mask ) ,
name ) ;
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if ( alg )
return crypto_is_larval ( alg ) ? crypto_larval_wait ( alg ) : alg ;
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return crypto_larval_add ( name , type , mask ) ;
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}
EXPORT_SYMBOL_GPL ( crypto_larval_lookup ) ;
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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 ) ;
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struct crypto_alg * crypto_alg_mod_lookup ( const char * name , u32 type , u32 mask )
{
struct crypto_alg * alg ;
struct crypto_alg * larval ;
int ok ;
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if ( ! ( ( type | mask ) & CRYPTO_ALG_TESTED ) ) {
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type | = CRYPTO_ALG_TESTED ;
mask | = CRYPTO_ALG_TESTED ;
}
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larval = crypto_larval_lookup ( name , type , mask ) ;
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if ( IS_ERR ( larval ) | | ! crypto_is_larval ( larval ) )
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return larval ;
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ok = crypto_probing_notify ( CRYPTO_MSG_ALG_REQUEST , larval ) ;
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if ( ok = = NOTIFY_STOP )
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alg = crypto_larval_wait ( larval ) ;
else {
crypto_mod_put ( larval ) ;
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alg = ERR_PTR ( - ENOENT ) ;
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}
crypto_larval_kill ( larval ) ;
return alg ;
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}
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EXPORT_SYMBOL_GPL ( crypto_alg_mod_lookup ) ;
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static int crypto_init_ops ( struct crypto_tfm * tfm , u32 type , u32 mask )
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{
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const struct crypto_type * type_obj = tfm - > __crt_alg - > cra_type ;
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if ( type_obj )
return type_obj - > init ( tfm , type , mask ) ;
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switch ( crypto_tfm_alg_type ( tfm ) ) {
case CRYPTO_ALG_TYPE_CIPHER :
return crypto_init_cipher_ops ( tfm ) ;
case CRYPTO_ALG_TYPE_DIGEST :
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if ( ( mask & CRYPTO_ALG_TYPE_HASH_MASK ) ! =
CRYPTO_ALG_TYPE_HASH_MASK )
return crypto_init_digest_ops_async ( tfm ) ;
else
return crypto_init_digest_ops ( tfm ) ;
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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 )
{
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const struct crypto_type * type = tfm - > __crt_alg - > cra_type ;
if ( type ) {
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if ( tfm - > exit )
tfm - > exit ( tfm ) ;
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return ;
}
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switch ( crypto_tfm_alg_type ( tfm ) ) {
case CRYPTO_ALG_TYPE_CIPHER :
crypto_exit_cipher_ops ( tfm ) ;
break ;
case CRYPTO_ALG_TYPE_DIGEST :
crypto_exit_digest_ops ( tfm ) ;
break ;
case CRYPTO_ALG_TYPE_COMPRESS :
crypto_exit_compress_ops ( tfm ) ;
break ;
default :
BUG ( ) ;
}
}
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static unsigned int crypto_ctxsize ( struct crypto_alg * alg , u32 type , u32 mask )
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{
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const struct crypto_type * type_obj = alg - > cra_type ;
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unsigned int len ;
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len = alg - > cra_alignmask & ~ ( crypto_tfm_ctx_alignment ( ) - 1 ) ;
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if ( type_obj )
return len + type_obj - > ctxsize ( alg , type , mask ) ;
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switch ( alg - > cra_flags & CRYPTO_ALG_TYPE_MASK ) {
default :
BUG ( ) ;
case CRYPTO_ALG_TYPE_CIPHER :
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len + = crypto_cipher_ctxsize ( alg ) ;
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break ;
case CRYPTO_ALG_TYPE_DIGEST :
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len + = crypto_digest_ctxsize ( alg ) ;
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break ;
case CRYPTO_ALG_TYPE_COMPRESS :
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len + = crypto_compress_ctxsize ( alg ) ;
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break ;
}
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return len ;
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}
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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 ) ;
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struct crypto_tfm * __crypto_alloc_tfm ( struct crypto_alg * alg , u32 type ,
u32 mask )
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{
struct crypto_tfm * tfm = NULL ;
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unsigned int tfm_size ;
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int err = - ENOMEM ;
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tfm_size = sizeof ( * tfm ) + crypto_ctxsize ( alg , type , mask ) ;
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tfm = kzalloc ( tfm_size , GFP_KERNEL ) ;
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if ( tfm = = NULL )
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goto out_err ;
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tfm - > __crt_alg = alg ;
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err = crypto_init_ops ( tfm , type , mask ) ;
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if ( err )
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goto out_free_tfm ;
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if ( ! tfm - > exit & & alg - > cra_init & & ( err = alg - > cra_init ( tfm ) ) )
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goto cra_init_failed ;
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goto out ;
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cra_init_failed :
crypto_exit_ops ( tfm ) ;
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out_free_tfm :
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if ( err = = - EAGAIN )
crypto_shoot_alg ( alg ) ;
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kfree ( tfm ) ;
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out_err :
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tfm = ERR_PTR ( err ) ;
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out :
return tfm ;
}
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EXPORT_SYMBOL_GPL ( __crypto_alloc_tfm ) ;
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/*
* crypto_alloc_base - Locate algorithm and allocate transform
* @ alg_name : Name of algorithm
* @ type : Type of algorithm
* @ mask : Mask for type comparison
*
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* This function should not be used by new algorithm types .
* Plesae use crypto_alloc_tfm instead .
*
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* 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 ) ;
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if ( IS_ERR ( alg ) ) {
err = PTR_ERR ( alg ) ;
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goto err ;
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}
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tfm = __crypto_alloc_tfm ( alg , type , mask ) ;
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if ( ! IS_ERR ( tfm ) )
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return tfm ;
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crypto_mod_put ( alg ) ;
err = PTR_ERR ( tfm ) ;
err :
if ( err ! = - EAGAIN )
break ;
if ( signal_pending ( current ) ) {
err = - EINTR ;
break ;
}
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}
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return ERR_PTR ( err ) ;
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}
EXPORT_SYMBOL_GPL ( crypto_alloc_base ) ;
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struct crypto_tfm * 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 , frontend ) ;
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 , frontend ) ;
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 :
tfm = ERR_PTR ( err ) ;
out :
return tfm ;
}
EXPORT_SYMBOL_GPL ( crypto_create_tfm ) ;
/*
* crypto_alloc_tfm - Locate algorithm and allocate transform
* @ alg_name : Name of algorithm
* @ frontend : Frontend algorithm type
* @ type : Type of algorithm
* @ mask : Mask for type comparison
*
* crypto_alloc_tfm ( ) 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_tfm ( const char * alg_name ,
const struct crypto_type * frontend ,
u32 type , u32 mask )
{
struct crypto_alg * ( * lookup ) ( const char * name , u32 type , u32 mask ) ;
struct crypto_tfm * tfm ;
int err ;
type & = frontend - > maskclear ;
mask & = frontend - > maskclear ;
type | = frontend - > type ;
mask | = frontend - > maskset ;
lookup = frontend - > lookup ? : crypto_alg_mod_lookup ;
for ( ; ; ) {
struct crypto_alg * alg ;
alg = lookup ( alg_name , type , mask ) ;
if ( IS_ERR ( alg ) ) {
err = PTR_ERR ( alg ) ;
goto err ;
}
tfm = crypto_create_tfm ( alg , frontend ) ;
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_tfm ) ;
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/*
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* crypto_destroy_tfm - Free crypto transform
* @ mem : Start of tfm slab
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* @ tfm : Transform to free
*
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* This function frees up the transform and any associated resources ,
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* then drops the refcount on the associated algorithm .
*/
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void crypto_destroy_tfm ( void * mem , struct crypto_tfm * tfm )
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{
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struct crypto_alg * alg ;
int size ;
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if ( unlikely ( ! mem ) )
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return ;
alg = tfm - > __crt_alg ;
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size = ksize ( mem ) ;
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if ( ! tfm - > exit & & alg - > cra_exit )
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alg - > cra_exit ( tfm ) ;
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crypto_exit_ops ( tfm ) ;
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crypto_mod_put ( alg ) ;
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memset ( mem , 0 , size ) ;
kfree ( mem ) ;
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}
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EXPORT_SYMBOL_GPL ( crypto_destroy_tfm ) ;
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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_mod_put ( alg ) ;
ret = 1 ;
}
return ret ;
}
EXPORT_SYMBOL_GPL ( crypto_has_alg ) ;
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MODULE_DESCRIPTION ( " Cryptographic core API " ) ;
MODULE_LICENSE ( " GPL " ) ;