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/*
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
/** @file
*
* CBC self-tests
*
*/
/* Forcibly enable assertions */
#undef NDEBUG
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ipxe/crypto.h>
#include <ipxe/profile.h>
#include "cbc_test.h"
/** Number of sample iterations for profiling */
#define PROFILE_COUNT 16
/**
* Test CBC encryption
*
* @v cipher Cipher algorithm
* @v key Key
* @v key_len Length of key
* @v iv Initialisation vector
* @v plaintext Plaintext data
* @v expected_ciphertext Expected ciphertext data
* @v len Length of data
* @ret ok Ciphertext is as expected
*/
int cbc_test_encrypt ( struct cipher_algorithm *cipher, const void *key,
size_t key_len, const void *iv, const void *plaintext,
const void *expected_ciphertext, size_t len ) {
uint8_t ctx[cipher->ctxsize];
uint8_t ciphertext[len];
int rc;
/* Initialise cipher */
rc = cipher_setkey ( cipher, ctx, key, key_len );
assert ( rc == 0 );
cipher_setiv ( cipher, ctx, iv );
/* Perform encryption */
cipher_encrypt ( cipher, ctx, plaintext, ciphertext, len );
/* Verify result */
return ( memcmp ( ciphertext, expected_ciphertext, len ) == 0 );
}
/**
* Test CBC decryption
*
* @v cipher Cipher algorithm
* @v key Key
* @v key_len Length of key
* @v iv Initialisation vector
* @v ciphertext Ciphertext data
* @v expected_plaintext Expected plaintext data
* @v len Length of data
* @ret ok Plaintext is as expected
*/
int cbc_test_decrypt ( struct cipher_algorithm *cipher, const void *key,
size_t key_len, const void *iv, const void *ciphertext,
const void *expected_plaintext, size_t len ) {
uint8_t ctx[cipher->ctxsize];
uint8_t plaintext[len];
int rc;
/* Initialise cipher */
rc = cipher_setkey ( cipher, ctx, key, key_len );
assert ( rc == 0 );
cipher_setiv ( cipher, ctx, iv );
/* Perform encryption */
cipher_decrypt ( cipher, ctx, ciphertext, plaintext, len );
/* Verify result */
return ( memcmp ( plaintext, expected_plaintext, len ) == 0 );
}
/**
* Calculate CBC encryption or decryption cost
*
* @v cipher Cipher algorithm
* @v key_len Length of key
* @v op Encryption or decryption operation
* @ret cost Cost (in cycles per byte)
*/
static unsigned long cbc_cost ( struct cipher_algorithm *cipher,
size_t key_len,
void ( * op ) ( struct cipher_algorithm *cipher,
void *ctx, const void *src,
void *dst, size_t len ) ) {
static uint8_t random[8192]; /* Too large for stack */
uint8_t key[key_len];
uint8_t iv[cipher->blocksize];
uint8_t ctx[cipher->ctxsize];
struct profiler profiler;
unsigned long cost;
unsigned int i;
int rc;
/* Fill buffer with pseudo-random data */
srand ( 0x1234568 );
for ( i = 0 ; i < sizeof ( random ) ; i++ )
random[i] = rand();
for ( i = 0 ; i < sizeof ( key ) ; i++ )
key[i] = rand();
for ( i = 0 ; i < sizeof ( iv ) ; i++ )
iv[i] = rand();
/* Initialise cipher */
rc = cipher_setkey ( cipher, ctx, key, key_len );
assert ( rc == 0 );
cipher_setiv ( cipher, ctx, iv );
/* Profile cipher operation */
memset ( &profiler, 0, sizeof ( profiler ) );
for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
profile_start ( &profiler );
op ( cipher, ctx, random, random, sizeof ( random ) );
profile_stop ( &profiler );
}
/* Round to nearest whole number of cycles per byte */
cost = ( ( profile_mean ( &profiler ) + ( sizeof ( random ) / 2 ) ) /
sizeof ( random ) );
return cost;
}
/**
* Calculate CBC encryption cost
*
* @v cipher Cipher algorithm
* @v key_len Length of key
* @ret cost Cost (in cycles per byte)
*/
unsigned long cbc_cost_encrypt ( struct cipher_algorithm *cipher,
size_t key_len ) {
return cbc_cost ( cipher, key_len, cipher_encrypt );
}
/**
* Calculate CBC decryption cost
*
* @v cipher Cipher algorithm
* @v key_len Length of key
* @ret cost Cost (in cycles per byte)
*/
unsigned long cbc_cost_decrypt ( struct cipher_algorithm *cipher,
size_t key_len ) {
return cbc_cost ( cipher, key_len, cipher_decrypt );
}
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