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crypto: gf128mul - The x8_ble multiplication functions

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It multiply GF(2^128) elements in the ble format.
It will be used by chelsio driver to speed up gf multiplication.

Signed-off-by: Harsh Jain <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Harsh Jain 2017-10-08 13:37:20 +05:30 committed by Herbert Xu
parent 40cdbe1a1b
commit acfc587810
2 changed files with 14 additions and 1 deletions
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13
crypto/gf128mul.c
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@ -156,6 +156,19 @@ static void gf128mul_x8_bbe(be128 *x)
x->b = cpu_to_be64((b << 8) ^ _tt); x->b = cpu_to_be64((b << 8) ^ _tt);
} }
void gf128mul_x8_ble(le128 *r, const le128 *x)
{
u64 a = le64_to_cpu(x->a);
u64 b = le64_to_cpu(x->b);
/* equivalent to gf128mul_table_be[b >> 63] (see crypto/gf128mul.c): */
u64 _tt = gf128mul_table_be[a >> 56];
r->a = cpu_to_le64((a << 8) | (b >> 56));
r->b = cpu_to_le64((b << 8) ^ _tt);
}
EXPORT_SYMBOL(gf128mul_x8_ble);
void gf128mul_lle(be128 *r, const be128 *b) void gf128mul_lle(be128 *r, const be128 *b)
{ {
be128 p[8]; be128 p[8];

2
include/crypto/gf128mul.h
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@ -227,7 +227,7 @@ struct gf128mul_4k *gf128mul_init_4k_lle(const be128 *g);
struct gf128mul_4k *gf128mul_init_4k_bbe(const be128 *g); struct gf128mul_4k *gf128mul_init_4k_bbe(const be128 *g);
void gf128mul_4k_lle(be128 *a, const struct gf128mul_4k *t); void gf128mul_4k_lle(be128 *a, const struct gf128mul_4k *t);
void gf128mul_4k_bbe(be128 *a, const struct gf128mul_4k *t); void gf128mul_4k_bbe(be128 *a, const struct gf128mul_4k *t);
void gf128mul_x8_ble(le128 *r, const le128 *x);
static inline void gf128mul_free_4k(struct gf128mul_4k *t) static inline void gf128mul_free_4k(struct gf128mul_4k *t)
{ {
kzfree(t); kzfree(t);