aes: xts: Fix description of gf128mul
THe function `mbedtls_gf128mul_x_ble()` doesn't multiply by x, x^4, and
x^8. Update the function description to properly describe what the function
does.
@@ -1105,10 +1105,10 @@ typedef unsigned char mbedtls_be128[16];
/*
* GF(2^128) multiplication function
*
- * This function multiplies a field element by x, by x^4 and by x^8 in the
- * polynomial field representation. It uses 64-bit word operations to gain
- * speed but compensates for machine endianess and hence works correctly on
- * both big and little endian machines.
+ * This function multiplies a field element by x in the polynomial field
+ * representation. It uses 64-bit word operations to gain speed but compensates
+ * for machine endianess and hence works correctly on both big and little
+ * endian machines.
*/
static void mbedtls_gf128mul_x_ble( unsigned char r[16],
const unsigned char x[16])
