crypto: gf128mul - The x8_ble multiplication functions

[linux-2.6-block.git] / crypto / gf128mul.c

diff --git a/crypto/gf128mul.c b/crypto/gf128mul.c
index dc012129c0631ab11a9d8afa69d8c57b06dc3ead..24e601954c7a405c12d30fbfdb683430edff1f07 100644 (file)
--- a/crypto/gf128mul.c
+++ b/crypto/gf128mul.c
@@ -156,6 +156,19 @@ static void gf128mul_x8_bbe(be128 *x)
        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)
 {
        be128 p[8];