crypto: ecc - Export additional helper functions
Export the following additional ECC helper functions:
- ecc_alloc_point()
- ecc_free_point()
- vli_num_bits()
- ecc_point_is_zero()
This is done to allow future ECC device drivers to re-use existing code,
thus simplifying their implementation.
Functions are exported using EXPORT_SYMBOL() (instead of
EXPORT_SYMBOL_GPL()) to be consistent with the functions already
exported by crypto/ecc.c.
Exported functions are documented in include/crypto/internal/ecc.h.
Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/ecc.c b/crypto/ecc.c
index 80efc9b..7315217 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -81,7 +81,7 @@ static void ecc_free_digits_space(u64 *space)
kfree_sensitive(space);
}
-static struct ecc_point *ecc_alloc_point(unsigned int ndigits)
+struct ecc_point *ecc_alloc_point(unsigned int ndigits)
{
struct ecc_point *p = kmalloc(sizeof(*p), GFP_KERNEL);
@@ -106,8 +106,9 @@ static struct ecc_point *ecc_alloc_point(unsigned int ndigits)
kfree(p);
return NULL;
}
+EXPORT_SYMBOL(ecc_alloc_point);
-static void ecc_free_point(struct ecc_point *p)
+void ecc_free_point(struct ecc_point *p)
{
if (!p)
return;
@@ -116,6 +117,7 @@ static void ecc_free_point(struct ecc_point *p)
kfree_sensitive(p->y);
kfree_sensitive(p);
}
+EXPORT_SYMBOL(ecc_free_point);
static void vli_clear(u64 *vli, unsigned int ndigits)
{
@@ -165,7 +167,7 @@ static unsigned int vli_num_digits(const u64 *vli, unsigned int ndigits)
}
/* Counts the number of bits required for vli. */
-static unsigned int vli_num_bits(const u64 *vli, unsigned int ndigits)
+unsigned int vli_num_bits(const u64 *vli, unsigned int ndigits)
{
unsigned int i, num_digits;
u64 digit;
@@ -180,6 +182,7 @@ static unsigned int vli_num_bits(const u64 *vli, unsigned int ndigits)
return ((num_digits - 1) * 64 + i);
}
+EXPORT_SYMBOL(vli_num_bits);
/* Set dest from unaligned bit string src. */
void vli_from_be64(u64 *dest, const void *src, unsigned int ndigits)
@@ -1062,11 +1065,12 @@ EXPORT_SYMBOL(vli_mod_inv);
/* ------ Point operations ------ */
/* Returns true if p_point is the point at infinity, false otherwise. */
-static bool ecc_point_is_zero(const struct ecc_point *point)
+bool ecc_point_is_zero(const struct ecc_point *point)
{
return (vli_is_zero(point->x, point->ndigits) &&
vli_is_zero(point->y, point->ndigits));
}
+EXPORT_SYMBOL(ecc_point_is_zero);
/* Point multiplication algorithm using Montgomery's ladder with co-Z
* coordinates. From https://eprint.iacr.org/2011/338.pdf