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mbedtls/tests/suites/test_suite_alignment.function
Dave Rodgman 481a5e427b Improve parsing of test data 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
2022-12-01 13:31:20 +00:00

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/* BEGIN_HEADER */
#include "../library/alignment.h"
#include <stdint.h>
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wunreachable-code"
#endif
#include <stdio.h>
/*
* Convert a string of the form "abcd" (case-insensitive) to a uint64_t.
*/
int parse_hex_string( char* hex_string, uint64_t *result )
{
uint8_t raw[8];
size_t olen;
if ( mbedtls_test_unhexify(raw, sizeof(raw), hex_string, &olen) != 0 ) return 0;
*result = 0;
for ( size_t i = 0; i < olen; i++ )
{
if ( MBEDTLS_IS_BIG_ENDIAN ) {
*result |= ((uint64_t)raw[i]) << ( i * 8 );
}
else
{
*result |= ((uint64_t)raw[i]) << ( (olen - i - 1) * 8 );
}
}
return 1;
}
/* END_HEADER */
/* BEGIN_CASE */
void mbedtls_unaligned_access( int size, int offset )
{
/* Define 64-bit aligned raw byte array */
uint64_t raw[2];
/* Populate with known data */
uint8_t *x = (uint8_t *) raw;
for ( size_t i = 0; i < sizeof(raw); i++ )
x[i] = (uint8_t)i;
TEST_ASSERT( size == 16 || size == 32 || size == 64 );
uint64_t r = 0;
switch ( size )
{
case 16:
r = mbedtls_get_unaligned_uint16( x + offset );
break;
case 32:
r = mbedtls_get_unaligned_uint32( x + offset );
break;
case 64:
r = mbedtls_get_unaligned_uint64( x + offset );
break;
}
/* Generate expected result */
uint64_t expected = 0;
for ( uint8_t i = 0; i < 8; i++ )
{
uint8_t shift;
if ( MBEDTLS_IS_BIG_ENDIAN )
{
/*
* Similar to little-endian case described below, but the shift needs
* to be inverted
*/
shift = 7 - ( i * 8 );
} else {
/* example for offset == 1:
* expected = (( 1 + 0 ) << (0 * 8)) | (( 1 + 1 ) << (1 * 8)) | (( 1 + 2 ) << (2 * 8)))
* = (1 << 0) | (2 << 8) | (3 << 16) ...
* = 0x0807060504030201
* x = { 0, 1, 2, 3, ... }
* ie expected is the value that would be read from x on a LE system, when
* byte swapping is not performed
*/
shift = i * 8;
}
uint64_t b = offset + i;
expected |= b << shift;
}
/* Mask out excess bits from expected result */
switch ( size )
{
case 16:
expected &= 0xffff;
break;
case 32:
expected &= 0xffffffff;
break;
}
TEST_EQUAL( r, expected );
/* Write sentinel to the part of the array we will testing writing to */
for ( size_t i = 0; i < (size_t) ( size / 8 ); i++ )
{
x[i + offset] = 0xff;
}
/*
* Write back to the array with mbedtls_put_unaligned_uint16 and validate
* that the array is unchanged as a result.
*/
switch ( size )
{
case 16:
mbedtls_put_unaligned_uint16( x + offset, r );
break;
case 32:
mbedtls_put_unaligned_uint32( x + offset, r );
break;
case 64:
mbedtls_put_unaligned_uint64( x + offset, r );
break;
}
for ( size_t i = 0; i < sizeof(x); i++ )
{
TEST_EQUAL( x[i], (uint8_t)i );
}
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_byteswap( char* input_str, int size, char *expected_str )
{
uint64_t input, expected;
TEST_ASSERT( parse_hex_string( input_str, &input ) );
TEST_ASSERT( parse_hex_string( expected_str, &expected ) );
/* Check against expected result */
uint64_t r = 0;
switch ( size )
{
case 16:
r = MBEDTLS_BSWAP16( input );
break;
case 32:
r = MBEDTLS_BSWAP32( input );
break;
case 64:
r = MBEDTLS_BSWAP64( input );
break;
default:
TEST_ASSERT( ! "size must be 16, 32 or 64" );
}
TEST_EQUAL( r, expected );
/*
* Check byte by byte by extracting bytes from opposite ends of
* input and r.
*/
for ( size_t i = 0; i < (size_t)( size / 8 ); i++ )
{
size_t s1 = i * 8;
size_t s2 = ( ( size / 8 - 1 ) - i ) * 8;
uint64_t a = ( input & ( (uint64_t)0xff << s1 ) ) >> s1;
uint64_t b = ( r & ( (uint64_t)0xff << s2 ) ) >> s2;
TEST_EQUAL( a, b );
}
/* Check BSWAP(BSWAP(x)) == x */
switch ( size )
{
case 16:
r = MBEDTLS_BSWAP16( r );
TEST_EQUAL( r, input & 0xffff );
break;
case 32:
r = MBEDTLS_BSWAP32( r );
TEST_EQUAL( r, input & 0xffffffff );
break;
case 64:
r = MBEDTLS_BSWAP64( r );
TEST_EQUAL( r, input );
break;
}
}
/* END_CASE */
/* BEGIN_CASE */
void get_byte()
{
uint8_t data[16];
for ( size_t i = 0; i < sizeof(data); i++ )
data[i] = (uint8_t) i;
uint64_t u64 = 0x0706050403020100;
for ( size_t b = 0; b < 8 ; b++ )
{
uint8_t expected = b;
uint8_t actual = b + 1;
switch ( b )
{
case 0:
actual = MBEDTLS_BYTE_0( u64 );
break;
case 1:
actual = MBEDTLS_BYTE_1( u64 );
break;
case 2:
actual = MBEDTLS_BYTE_2( u64 );
break;
case 3:
actual = MBEDTLS_BYTE_3( u64 );
break;
case 4:
actual = MBEDTLS_BYTE_4( u64 );
break;
case 5:
actual = MBEDTLS_BYTE_5( u64 );
break;
case 6:
actual = MBEDTLS_BYTE_6( u64 );
break;
case 7:
actual = MBEDTLS_BYTE_7( u64 );
break;
}
TEST_EQUAL( actual, expected );
}
uint32_t u32 = 0x03020100;
for ( size_t b = 0; b < 4 ; b++ )
{
uint8_t expected = b;
uint8_t actual = b + 1;
switch ( b )
{
case 0:
actual = MBEDTLS_BYTE_0( u32 );
break;
case 1:
actual = MBEDTLS_BYTE_1( u32 );
break;
case 2:
actual = MBEDTLS_BYTE_2( u32 );
break;
case 3:
actual = MBEDTLS_BYTE_3( u32 );
break;
}
TEST_EQUAL( actual, expected );
}
uint16_t u16 = 0x0100;
for ( size_t b = 0; b < 2 ; b++ )
{
uint8_t expected = b;
uint8_t actual = b + 1;
switch ( b )
{
case 0:
actual = MBEDTLS_BYTE_0( u16 );
break;
case 1:
actual = MBEDTLS_BYTE_1( u16 );
break;
}
TEST_EQUAL( actual, expected );
}
uint8_t u8 = 0x01;
uint8_t actual = MBEDTLS_BYTE_0( u8 );
TEST_EQUAL( actual, u8 );
}
/* END_CASE */
/* BEGIN_CASE */
void unaligned_access_endian_aware(int size, int offset, int big_endian )
{
TEST_ASSERT( size == 16 || size == 24 || size == 32 || size == 64 );
TEST_ASSERT( offset >= 0 && offset < 8 );
/* Define 64-bit aligned raw byte array */
uint64_t raw[2];
/* Populate with known data: x == { 0, 1, 2, ... } */
uint8_t *x = (uint8_t *) raw;
for ( size_t i = 0; i < sizeof(raw); i++ )
x[i] = (uint8_t) i;
uint64_t read = 0;
if ( big_endian )
{
switch ( size )
{
case 16:
read = MBEDTLS_GET_UINT16_BE( x, offset );
break;
case 24:
read = MBEDTLS_GET_UINT24_BE( x, offset );
break;
case 32:
read = MBEDTLS_GET_UINT32_BE( x, offset );
break;
case 64:
read = MBEDTLS_GET_UINT64_BE( x, offset );
break;
}
}
else
{
switch ( size )
{
case 16:
read = MBEDTLS_GET_UINT16_LE( x, offset );
break;
case 24:
read = MBEDTLS_GET_UINT24_LE( x, offset );
break;
case 32:
read = MBEDTLS_GET_UINT32_LE( x, offset );
break;
case 64:
read = MBEDTLS_GET_UINT64_LE( x, offset );
break;
}
}
/* Build up expected value byte by byte, in either big or little endian format */
uint64_t expected = 0;
for ( size_t i = 0; i < (size_t)(size / 8); i++ )
{
uint64_t b = x[i + offset];
uint8_t shift = (big_endian) ? (8 * ((size / 8 - 1) - i)) : (8 * i);
expected |= b << shift;
}
/* Verify read */
TEST_EQUAL( read, expected );
/* Test writing back to memory. First write sentiel */
for ( size_t i = 0; i < (size_t)(size / 8); i++ )
{
x[i + offset] = 0xff;
}
/* Overwrite sentinel with endian-aware write macro */
if ( big_endian )
{
switch ( size )
{
case 16:
MBEDTLS_PUT_UINT16_BE( read, x, offset );
break;
case 24:
MBEDTLS_PUT_UINT24_BE( read, x, offset );
break;
case 32:
MBEDTLS_PUT_UINT32_BE( read, x, offset );
break;
case 64:
MBEDTLS_PUT_UINT64_BE( read, x, offset );
break;
}
}
else
{
switch ( size )
{
case 16:
MBEDTLS_PUT_UINT16_LE( read, x, offset );
break;
case 24:
MBEDTLS_PUT_UINT24_LE( read, x, offset );
break;
case 32:
MBEDTLS_PUT_UINT32_LE( read, x, offset );
break;
case 64:
MBEDTLS_PUT_UINT64_LE( read, x, offset );
break;
}
}
/* Verify write - check memory is correct */
for ( size_t i = 0; i < sizeof(raw); i++ )
TEST_EQUAL( x[i], (uint8_t) i );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_is_big_endian()
{
uint16_t check = 0x1234;
uint8_t* p = (uint8_t*) &check;
if ( MBEDTLS_IS_BIG_ENDIAN )
{
/* Big-endian: data stored MSB first, i.e. p == { 0x12, 0x34 } */
TEST_EQUAL( p[0], 0x12 );
TEST_EQUAL( p[1], 0x34 );
}
else
{
/* Little-endian: data stored LSB first, i.e. p == { 0x34, 0x12 } */
TEST_EQUAL( p[0], 0x34 );
TEST_EQUAL( p[1], 0x12 );
}
}
/* END_CASE */
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