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[CRYPTO] api: Split out low-level API

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The crypto API is made up of the part facing users such as IPsec and the
low-level part which is used by cryptographic entities such as algorithms.
This patch splits out the latter so that the two APIs are more clearly
delineated.  As a bonus the low-level API can now be modularised if all
algorithms are built as modules.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2006-08-21 21:08:13 +10:00
parent 9409f38a0c
commit cce9e06d10
8 changed files with 204 additions and 134 deletions
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84
crypto/Kconfig
View File

@ -9,47 +9,54 @@ config CRYPTO
help
This option provides the core Cryptographic API.
if CRYPTO
config CRYPTO_ALGAPI
tristate
help
This option provides the API for cryptographic algorithms.
config CRYPTO_HMAC
bool "HMAC support"
depends on CRYPTO
help
HMAC: Keyed-Hashing for Message Authentication (RFC2104).
This is required for IPSec.
config CRYPTO_NULL
tristate "Null algorithms"
depends on CRYPTO
select CRYPTO_ALGAPI
help
These are 'Null' algorithms, used by IPsec, which do nothing.
config CRYPTO_MD4
tristate "MD4 digest algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
MD4 message digest algorithm (RFC1320).
config CRYPTO_MD5
tristate "MD5 digest algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
MD5 message digest algorithm (RFC1321).
config CRYPTO_SHA1
tristate "SHA1 digest algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
config CRYPTO_SHA1_S390
tristate "SHA1 digest algorithm (s390)"
depends on CRYPTO && S390
depends on S390
select CRYPTO_ALGAPI
help
This is the s390 hardware accelerated implementation of the
SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
config CRYPTO_SHA256
tristate "SHA256 digest algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
SHA256 secure hash standard (DFIPS 180-2).
@ -58,7 +65,8 @@ config CRYPTO_SHA256
config CRYPTO_SHA256_S390
tristate "SHA256 digest algorithm (s390)"
depends on CRYPTO && S390
depends on S390
select CRYPTO_ALGAPI
help
This is the s390 hardware accelerated implementation of the
SHA256 secure hash standard (DFIPS 180-2).
@ -68,7 +76,7 @@ config CRYPTO_SHA256_S390
config CRYPTO_SHA512
tristate "SHA384 and SHA512 digest algorithms"
depends on CRYPTO
select CRYPTO_ALGAPI
help
SHA512 secure hash standard (DFIPS 180-2).
@ -80,7 +88,7 @@ config CRYPTO_SHA512
config CRYPTO_WP512
tristate "Whirlpool digest algorithms"
depends on CRYPTO
select CRYPTO_ALGAPI
help
Whirlpool hash algorithm 512, 384 and 256-bit hashes
@ -92,7 +100,7 @@ config CRYPTO_WP512
config CRYPTO_TGR192
tristate "Tiger digest algorithms"
depends on CRYPTO
select CRYPTO_ALGAPI
help
Tiger hash algorithm 192, 160 and 128-bit hashes
@ -105,19 +113,20 @@ config CRYPTO_TGR192
config CRYPTO_DES
tristate "DES and Triple DES EDE cipher algorithms"
depends on CRYPTO
select CRYPTO_ALGAPI
help
DES cipher algorithm (FIPS 46-2), and Triple DES EDE (FIPS 46-3).
config CRYPTO_DES_S390
tristate "DES and Triple DES cipher algorithms (s390)"
depends on CRYPTO && S390
depends on S390
select CRYPTO_ALGAPI
help
DES cipher algorithm (FIPS 46-2), and Triple DES EDE (FIPS 46-3).
config CRYPTO_BLOWFISH
tristate "Blowfish cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
Blowfish cipher algorithm, by Bruce Schneier.
@ -130,7 +139,7 @@ config CRYPTO_BLOWFISH
config CRYPTO_TWOFISH
tristate "Twofish cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
select CRYPTO_TWOFISH_COMMON
help
Twofish cipher algorithm.
@ -145,14 +154,14 @@ config CRYPTO_TWOFISH
config CRYPTO_TWOFISH_COMMON
tristate
depends on CRYPTO
help
Common parts of the Twofish cipher algorithm shared by the
generic c and the assembler implementations.
config CRYPTO_TWOFISH_586
tristate "Twofish cipher algorithms (i586)"
depends on CRYPTO && ((X86 || UML_X86) && !64BIT)
depends on (X86 || UML_X86) && !64BIT
select CRYPTO_ALGAPI
select CRYPTO_TWOFISH_COMMON
help
Twofish cipher algorithm.
@ -167,7 +176,8 @@ config CRYPTO_TWOFISH_586
config CRYPTO_TWOFISH_X86_64
tristate "Twofish cipher algorithm (x86_64)"
depends on CRYPTO && ((X86 || UML_X86) && 64BIT)
depends on (X86 || UML_X86) && 64BIT
select CRYPTO_ALGAPI
select CRYPTO_TWOFISH_COMMON
help
Twofish cipher algorithm (x86_64).
@ -182,7 +192,7 @@ config CRYPTO_TWOFISH_X86_64
config CRYPTO_SERPENT
tristate "Serpent cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
Serpent cipher algorithm, by Anderson, Biham & Knudsen.
@ -195,7 +205,7 @@ config CRYPTO_SERPENT
config CRYPTO_AES
tristate "AES cipher algorithms"
depends on CRYPTO
select CRYPTO_ALGAPI
help
AES cipher algorithms (FIPS-197). AES uses the Rijndael
algorithm.
@ -215,7 +225,8 @@ config CRYPTO_AES
config CRYPTO_AES_586
tristate "AES cipher algorithms (i586)"
depends on CRYPTO && ((X86 || UML_X86) && !64BIT)
depends on (X86 || UML_X86) && !64BIT
select CRYPTO_ALGAPI
help
AES cipher algorithms (FIPS-197). AES uses the Rijndael
algorithm.
@ -235,7 +246,8 @@ config CRYPTO_AES_586
config CRYPTO_AES_X86_64
tristate "AES cipher algorithms (x86_64)"
depends on CRYPTO && ((X86 || UML_X86) && 64BIT)
depends on (X86 || UML_X86) && 64BIT
select CRYPTO_ALGAPI
help
AES cipher algorithms (FIPS-197). AES uses the Rijndael
algorithm.
@ -255,7 +267,8 @@ config CRYPTO_AES_X86_64
config CRYPTO_AES_S390
tristate "AES cipher algorithms (s390)"
depends on CRYPTO && S390
depends on S390
select CRYPTO_ALGAPI
help
This is the s390 hardware accelerated implementation of the
AES cipher algorithms (FIPS-197). AES uses the Rijndael
@ -275,21 +288,21 @@ config CRYPTO_AES_S390
config CRYPTO_CAST5
tristate "CAST5 (CAST-128) cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
The CAST5 encryption algorithm (synonymous with CAST-128) is
described in RFC2144.
config CRYPTO_CAST6
tristate "CAST6 (CAST-256) cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
The CAST6 encryption algorithm (synonymous with CAST-256) is
described in RFC2612.
config CRYPTO_TEA
tristate "TEA, XTEA and XETA cipher algorithms"
depends on CRYPTO
select CRYPTO_ALGAPI
help
TEA cipher algorithm.
@ -306,7 +319,7 @@ config CRYPTO_TEA
config CRYPTO_ARC4
tristate "ARC4 cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
ARC4 cipher algorithm.
@ -317,7 +330,7 @@ config CRYPTO_ARC4
config CRYPTO_KHAZAD
tristate "Khazad cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
Khazad cipher algorithm.
@ -330,7 +343,7 @@ config CRYPTO_KHAZAD
config CRYPTO_ANUBIS
tristate "Anubis cipher algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
Anubis cipher algorithm.
@ -345,7 +358,7 @@ config CRYPTO_ANUBIS
config CRYPTO_DEFLATE
tristate "Deflate compression algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
select ZLIB_INFLATE
select ZLIB_DEFLATE
help
@ -356,7 +369,7 @@ config CRYPTO_DEFLATE
config CRYPTO_MICHAEL_MIC
tristate "Michael MIC keyed digest algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
help
Michael MIC is used for message integrity protection in TKIP
(IEEE 802.11i). This algorithm is required for TKIP, but it
@ -365,7 +378,7 @@ config CRYPTO_MICHAEL_MIC
config CRYPTO_CRC32C
tristate "CRC32c CRC algorithm"
depends on CRYPTO
select CRYPTO_ALGAPI
select LIBCRC32C
help
Castagnoli, et al Cyclic Redundancy-Check Algorithm. Used
@ -375,10 +388,13 @@ config CRYPTO_CRC32C
config CRYPTO_TEST
tristate "Testing module"
depends on CRYPTO && m
depends on m
select CRYPTO_ALGAPI
help
Quick & dirty crypto test module.
source "drivers/crypto/Kconfig"
endmenu
endif # if CRYPTO
endmenu

7
crypto/Makefile
View File

@ -2,10 +2,11 @@
# Cryptographic API
#
proc-crypto-$(CONFIG_PROC_FS) = proc.o
obj-$(CONFIG_CRYPTO) += api.o scatterwalk.o cipher.o digest.o compress.o
obj-$(CONFIG_CRYPTO) += api.o scatterwalk.o cipher.o digest.o compress.o \
$(proc-crypto-y)
crypto_algapi-$(CONFIG_PROC_FS) += proc.o
crypto_algapi-objs := algapi.o $(crypto_algapi-y)
obj-$(CONFIG_CRYPTO_ALGAPI) += crypto_algapi.o
obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o

118
crypto/algapi.c Normal file
View File

@ -0,0 +1,118 @@
/*
* Cryptographic API for algorithms (i.e., low-level API).
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*
* 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/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include "internal.h"
static inline int crypto_set_driver_name(struct crypto_alg *alg)
{
static const char suffix[] = "-generic";
char *driver_name = alg->cra_driver_name;
int len;
if (*driver_name)
return 0;
len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
memcpy(driver_name + len, suffix, sizeof(suffix));
return 0;
}
int crypto_register_alg(struct crypto_alg *alg)
{
int ret;
struct crypto_alg *q;
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
return -EINVAL;
if (alg->cra_alignmask & alg->cra_blocksize)
return -EINVAL;
if (alg->cra_blocksize > PAGE_SIZE / 8)
return -EINVAL;
if (alg->cra_priority < 0)
return -EINVAL;
ret = crypto_set_driver_name(alg);
if (unlikely(ret))
return ret;
down_write(&crypto_alg_sem);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (q == alg) {
ret = -EEXIST;
goto out;
}
}
list_add(&alg->cra_list, &crypto_alg_list);
atomic_set(&alg->cra_refcnt, 1);
out:
up_write(&crypto_alg_sem);
return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_alg);
int crypto_unregister_alg(struct crypto_alg *alg)
{
int ret = -ENOENT;
struct crypto_alg *q;
down_write(&crypto_alg_sem);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (alg == q) {
list_del(&alg->cra_list);
ret = 0;
goto out;
}
}
out:
up_write(&crypto_alg_sem);
if (ret)
return ret;
BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
if (alg->cra_destroy)
alg->cra_destroy(alg);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_alg);
static int __init crypto_algapi_init(void)
{
crypto_init_proc();
return 0;
}
static void __exit crypto_algapi_exit(void)
{
crypto_exit_proc();
}
module_init(crypto_algapi_init);
module_exit(crypto_algapi_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cryptographic algorithms API");

97
crypto/api.c
View File

@ -15,19 +15,17 @@
*
*/
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/crypto.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/rwsem.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);
static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
{
@ -239,86 +237,6 @@ void crypto_free_tfm(struct crypto_tfm *tfm)
kfree(tfm);
}
static inline int crypto_set_driver_name(struct crypto_alg *alg)
{
static const char suffix[] = "-generic";
char *driver_name = alg->cra_driver_name;
int len;
if (*driver_name)
return 0;
len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
memcpy(driver_name + len, suffix, sizeof(suffix));
return 0;
}
int crypto_register_alg(struct crypto_alg *alg)
{
int ret;
struct crypto_alg *q;
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
return -EINVAL;
if (alg->cra_alignmask & alg->cra_blocksize)
return -EINVAL;
if (alg->cra_blocksize > PAGE_SIZE / 8)
return -EINVAL;
if (alg->cra_priority < 0)
return -EINVAL;
ret = crypto_set_driver_name(alg);
if (unlikely(ret))
return ret;
down_write(&crypto_alg_sem);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (q == alg) {
ret = -EEXIST;
goto out;
}
}
list_add(&alg->cra_list, &crypto_alg_list);
atomic_set(&alg->cra_refcnt, 1);
out:
up_write(&crypto_alg_sem);
return ret;
}
int crypto_unregister_alg(struct crypto_alg *alg)
{
int ret = -ENOENT;
struct crypto_alg *q;
down_write(&crypto_alg_sem);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (alg == q) {
list_del(&alg->cra_list);
ret = 0;
goto out;
}
}
out:
up_write(&crypto_alg_sem);
if (ret)
return ret;
BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
if (alg->cra_destroy)
alg->cra_destroy(alg);
return 0;
}
int crypto_alg_available(const char *name, u32 flags)
{
int ret = 0;
@ -332,17 +250,6 @@ int crypto_alg_available(const char *name, u32 flags)
return ret;
}
static int __init init_crypto(void)
{
printk(KERN_INFO "Initializing Cryptographic API\n");
crypto_init_proc();
return 0;
}
__initcall(init_crypto);
EXPORT_SYMBOL_GPL(crypto_register_alg);
EXPORT_SYMBOL_GPL(crypto_unregister_alg);
EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
EXPORT_SYMBOL_GPL(crypto_free_tfm);
EXPORT_SYMBOL_GPL(crypto_alg_available);

6
crypto/internal.h
View File

@ -12,7 +12,8 @@
*/
#ifndef _CRYPTO_INTERNAL_H
#define _CRYPTO_INTERNAL_H
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
@ -64,9 +65,12 @@ static inline void crypto_free_hmac_block(struct crypto_tfm *tfm)
#ifdef CONFIG_PROC_FS
void __init crypto_init_proc(void);
void __exit crypto_exit_proc(void);
#else
static inline void crypto_init_proc(void)
{ }
static inline void crypto_exit_proc(void)
{ }
#endif
static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg,

5
crypto/proc.c
View File

@ -113,3 +113,8 @@ void __init crypto_init_proc(void)
if (proc)
proc->proc_fops = &proc_crypto_ops;
}
void __exit crypto_exit_proc(void)
{
remove_proc_entry("crypto", NULL);
}

3
drivers/crypto/Kconfig
View File

@ -2,7 +2,8 @@ menu "Hardware crypto devices"
config CRYPTO_DEV_PADLOCK
tristate "Support for VIA PadLock ACE"
depends on CRYPTO && X86_32
depends on X86_32
select CRYPTO_ALGAPI
help
Some VIA processors come with an integrated crypto engine
(so called VIA PadLock ACE, Advanced Cryptography Engine)

18
include/crypto/algapi.h Normal file
View File

@ -0,0 +1,18 @@
/*
* Cryptographic API for algorithms (i.e., low-level API).
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*
* 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.
*
*/
#ifndef _CRYPTO_ALGAPI_H
#define _CRYPTO_ALGAPI_H
#include <linux/crypto.h>
#endif /* _CRYPTO_ALGAPI_H */