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[CRYPTO] api: Add support for multiple template parameters

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This patch adds support for having multiple parameters to
a template, separated by a comma.  It also adds support
for integer parameters in addition to the current algorithm
parameter type.

This will be used by the authenc template which will have
four parameters: the authentication algorithm, the encryption
algorithm, the authentication size and the encryption key
length.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2007-08-29 19:27:26 +08:00 committed by David S. Miller
parent 1ae978208e
commit 39e1ee011f
3 changed files with 83 additions and 26 deletions
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8
crypto/algapi.c
View File

@ -439,13 +439,15 @@ EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
{
struct rtattr *rta = tb[CRYPTOA_TYPE - 1];
struct rtattr *rta = tb[0];
struct crypto_attr_type *algt;
if (!rta)
return ERR_PTR(-ENOENT);
if (RTA_PAYLOAD(rta) < sizeof(*algt))
return ERR_PTR(-EINVAL);
if (rta->rta_type != CRYPTOA_TYPE)
return ERR_PTR(-EINVAL);
algt = RTA_DATA(rta);
@ -470,13 +472,15 @@ EXPORT_SYMBOL_GPL(crypto_check_attr_type);
struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask)
{
struct rtattr *rta = tb[CRYPTOA_ALG - 1];
struct rtattr *rta = tb[1];
struct crypto_attr_alg *alga;
if (!rta)
return ERR_PTR(-ENOENT);
if (RTA_PAYLOAD(rta) < sizeof(*alga))
return ERR_PTR(-EINVAL);
if (rta->rta_type != CRYPTOA_ALG)
return ERR_PTR(-EINVAL);
alga = RTA_DATA(rta);
alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;

93
crypto/cryptomgr.c
View File

@ -24,22 +24,26 @@
#include "internal.h"
struct cryptomgr_param {
struct rtattr *tb[CRYPTOA_MAX];
struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
struct {
struct rtattr attr;
struct crypto_attr_type data;
} type;
struct {
union {
struct rtattr attr;
struct crypto_attr_alg data;
} alg;
struct {
char name[CRYPTO_MAX_ALG_NAME];
} larval;
struct {
struct rtattr attr;
struct crypto_attr_alg data;
} alg;
struct {
struct rtattr attr;
struct crypto_attr_u32 data;
} nu32;
} attrs[CRYPTO_MAX_ATTRS];
char larval[CRYPTO_MAX_ALG_NAME];
char template[CRYPTO_MAX_ALG_NAME];
};
@ -72,7 +76,7 @@ out:
module_put_and_exit(0);
err:
crypto_larval_error(param->larval.name, param->type.data.type,
crypto_larval_error(param->larval, param->type.data.type,
param->type.data.mask);
goto out;
}
@ -84,6 +88,7 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
const char *name = larval->alg.cra_name;
const char *p;
unsigned int len;
int i;
if (!try_module_get(THIS_MODULE))
goto err;
@ -101,33 +106,73 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
memcpy(param->template, name, len);
name = p + 1;
len = 0;
for (p = name; *p; p++) {
for (; isalnum(*p) || *p == '-' || *p == '_' || *p == '('; p++)
;
i = 0;
for (;;) {
int notnum = 0;
if (*p != ')')
goto err_free_param;
name = ++p;
len = 0;
for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
notnum |= !isdigit(*p);
if (*p == '(') {
int recursion = 0;
for (;;) {
if (!*++p)
goto err_free_param;
if (*p == '(')
recursion++;
else if (*p == ')' && !recursion--)
break;
}
notnum = 1;
}
len = p - name;
if (!len)
goto err_free_param;
if (notnum) {
param->attrs[i].alg.attr.rta_len =
sizeof(param->attrs[i].alg);
param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
memcpy(param->attrs[i].alg.data.name, name, len);
} else {
param->attrs[i].nu32.attr.rta_len =
sizeof(param->attrs[i].nu32);
param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
param->attrs[i].nu32.data.num =
simple_strtol(name, NULL, 0);
}
param->tb[i + 1] = &param->attrs[i].attr;
i++;
if (WARN_ON(i >= CRYPTO_MAX_ATTRS))
goto err_free_param;
if (*p == ')')
break;
if (*p != ',')
goto err_free_param;
}
if (!len || name[len + 1])
if (!i)
goto err_free_param;
param->tb[i + 1] = NULL;
param->type.attr.rta_len = sizeof(param->type);
param->type.attr.rta_type = CRYPTOA_TYPE;
param->type.data.type = larval->alg.cra_flags;
param->type.data.mask = larval->mask;
param->tb[CRYPTOA_TYPE - 1] = &param->type.attr;
param->tb[0] = &param->type.attr;
param->alg.attr.rta_len = sizeof(param->alg);
param->alg.attr.rta_type = CRYPTOA_ALG;
memcpy(param->alg.data.name, name, len);
param->tb[CRYPTOA_ALG - 1] = &param->alg.attr;
memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
thread = kthread_run(cryptomgr_probe, param, "cryptomgr");
if (IS_ERR(thread))

8
include/linux/crypto.h
View File

@ -425,11 +425,15 @@ enum {
CRYPTOA_UNSPEC,
CRYPTOA_ALG,
CRYPTOA_TYPE,
CRYPTOA_U32,
__CRYPTOA_MAX,
};
#define CRYPTOA_MAX (__CRYPTOA_MAX - 1)
/* Maximum number of (rtattr) parameters for each template. */
#define CRYPTO_MAX_ATTRS 32
struct crypto_attr_alg {
char name[CRYPTO_MAX_ALG_NAME];
};
@ -439,6 +443,10 @@ struct crypto_attr_type {
u32 mask;
};
struct crypto_attr_u32 {
u32 num;
};
/*
* Transform user interface.
*/