lib/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-07-29 11:41:15 +03:00
Code Activity

gf128mul: Inline instead of making a new module

Browse Source
This commit is contained in:
Jaeden Amero
2018-05-29 17:00:47 +01:00
parent 97cc3b1354
commit 010c2cb456
4 changed files with 55 additions and 124 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
library/aes.c
View File

@ -44,10 +44,6 @@
#include "mbedtls/aesni.h"
#endif
#if defined(MBEDTLS_CIPHER_MODE_XEX) || defined(MBEDTLS_CIPHER_MODE_XTS)
#include "mbedtls/gf128mul.h"
#endif
#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
@ -1046,6 +1042,61 @@ first:
#endif /* MBEDTLS_CIPHER_MODE_XEX */
#if defined(MBEDTLS_CIPHER_MODE_XTS)
/* Endianess with 64 bits values */
#ifndef GET_UINT64_LE
#define GET_UINT64_LE(n,b,i) \
{ \
(n) = ( (uint64_t) (b)[(i) + 7] << 56 ) \
| ( (uint64_t) (b)[(i) + 6] << 48 ) \
| ( (uint64_t) (b)[(i) + 5] << 40 ) \
| ( (uint64_t) (b)[(i) + 4] << 32 ) \
| ( (uint64_t) (b)[(i) + 3] << 24 ) \
| ( (uint64_t) (b)[(i) + 2] << 16 ) \
| ( (uint64_t) (b)[(i) + 1] << 8 ) \
| ( (uint64_t) (b)[(i) ] ); \
}
#endif
#ifndef PUT_UINT64_LE
#define PUT_UINT64_LE(n,b,i) \
{ \
(b)[(i) + 7] = (unsigned char) ( (n) >> 56 ); \
(b)[(i) + 6] = (unsigned char) ( (n) >> 48 ); \
(b)[(i) + 5] = (unsigned char) ( (n) >> 40 ); \
(b)[(i) + 4] = (unsigned char) ( (n) >> 32 ); \
(b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
(b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
(b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
(b)[(i) ] = (unsigned char) ( (n) ); \
}
#endif
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.
*/
static void mbedtls_gf128mul_x_ble( unsigned char r[16],
const unsigned char x[16])
{
uint64_t a, b, ra, rb;
GET_UINT64_LE(a, x, 0);
GET_UINT64_LE(b, x, 8);
ra = (a << 1) ^ 0x0087 >> ( 8 - ( ( b >> 63 ) << 3 ) );
rb = (a >> 63) | (b << 1);
PUT_UINT64_LE(ra, r, 0);
PUT_UINT64_LE(rb, r, 8);
}
/*
* AES-XTS buffer encryption/decryption
*/