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[CRYPTO] hifn_795x: Detect weak keys

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HIFN driver update to use DES weak key checks (exported in this patch).

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Evgeniy Polyakov 2007-10-11 19:58:16 +08:00 committed by Herbert Xu
parent 16d004a2ed
commit c3041f9c93
3 changed files with 17 additions and 5 deletions
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9
crypto/des_generic.c
View file

@ -628,7 +628,7 @@ static const u32 S8[64] = {
* Choice 1 has operated on the key.
*
*/
static unsigned long ekey(u32 *pe, const u8 *k)
unsigned long des_ekey(u32 *pe, const u8 *k)
{
/* K&R: long is at least 32 bits */
unsigned long a, b, c, d, w;
@ -703,6 +703,7 @@ static unsigned long ekey(u32 *pe, const u8 *k)
/* Zero if weak key */
return w;
}
EXPORT_SYMBOL_GPL(des_ekey);
/*
* Decryption key expansion
@ -786,7 +787,7 @@ static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
int ret;
/* Expand to tmp */
ret = ekey(tmp, key);
ret = des_ekey(tmp, key);
if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
@ -873,9 +874,9 @@ static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
return -EINVAL;
}
ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
des_ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
dkey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
ekey(expkey, key);
des_ekey(expkey, key);
return 0;
}

2
drivers/crypto/Kconfig
View file

@ -85,9 +85,9 @@ config ZCRYPT_MONOLITHIC
config CRYPTO_DEV_HIFN_795X
tristate "Driver HIFN 795x crypto accelerator chips"
select CRYPTO_DES
select CRYPTO_ALGAPI
select CRYPTO_ABLKCIPHER
select CRYPTO_BLKCIPHER
help
This option allows you to have support for HIFN 795x crypto adapters.

11
drivers/crypto/hifn_795x.c
View file

@ -29,6 +29,7 @@
#include <linux/crypto.h>
#include <crypto/algapi.h>
#include <crypto/des.h>
#include <asm/kmap_types.h>
@ -1924,6 +1925,16 @@ static int hifn_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
return -1;
}
if (len == HIFN_DES_KEY_LENGTH) {
u32 tmp[DES_EXPKEY_WORDS];
int ret = des_ekey(tmp, key);
if (unlikely(ret == 0) && (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
}
dev->flags &= ~HIFN_FLAG_OLD_KEY;
memcpy(ctx->key, key, len);