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