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aes: xts: Fix description of gf128mul

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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.
This commit is contained in:
Jaeden Amero 2018-05-31 09:23:32 +01:00
parent f167deb6e0
commit 5f0b06aeda
1 changed files with 4 additions and 4 deletions
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8
library/aes.c
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@ -1105,10 +1105,10 @@ typedef unsigned char mbedtls_be128[16];
/* /*
* GF(2^128) multiplication function * GF(2^128) multiplication function
* *
* This function multiplies a field element by x, by x^4 and by x^8 in the * This function multiplies a field element by x in the polynomial field
* polynomial field representation. It uses 64-bit word operations to gain * representation. It uses 64-bit word operations to gain speed but compensates
* speed but compensates for machine endianess and hence works correctly on * for machine endianess and hence works correctly on both big and little
* both big and little endian machines. * endian machines.
*/ */
static void mbedtls_gf128mul_x_ble( unsigned char r[16], static void mbedtls_gf128mul_x_ble( unsigned char r[16],
const unsigned char x[16]) const unsigned char x[16])