385 lines
12 KiB
Text
385 lines
12 KiB
Text
/* BEGIN_HEADER */
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#include "mbedtls/entropy.h"
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#include "mbedtls/entropy_poll.h"
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/*
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* Number of calls made to entropy_dummy_source()
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*/
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static size_t entropy_dummy_calls;
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/*
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* Dummy entropy source
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*
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* If data is NULL, write exactly the requested length.
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* Otherwise, write the length indicated by data or error if negative
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*/
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static int entropy_dummy_source( void *data, unsigned char *output,
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size_t len, size_t *olen )
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{
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entropy_dummy_calls++;
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if( data == NULL )
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*olen = len;
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else
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{
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int *d = (int *) data;
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if( *d < 0 )
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return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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else
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*olen = *d;
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}
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memset( output, 0x2a, *olen );
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return( 0 );
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}
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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/*
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* Ability to clear entropy sources to allow testing with just predefined
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* entropy sources. This function or tests depending on it might break if there
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* are internal changes to how entropy sources are registered.
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*
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* To be called immediately after mbedtls_entropy_init().
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*
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* Just resetting the counter. New sources will overwrite existing ones.
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* This might break memory checks in the future if sources need 'free-ing' then
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* as well.
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*/
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static void entropy_clear_sources( mbedtls_entropy_context *ctx )
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{
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ctx->source_count = 0;
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}
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/*
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* NV seed read/write functions that use a buffer instead of a file
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*/
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static unsigned char buffer_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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static int buffer_nv_seed_read( unsigned char *buf, size_t buf_len )
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{
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if( buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE )
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return( -1 );
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memcpy( buf, buffer_seed, MBEDTLS_ENTROPY_BLOCK_SIZE );
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return( 0 );
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}
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static int buffer_nv_seed_write( unsigned char *buf, size_t buf_len )
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{
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if( buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE )
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return( -1 );
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memcpy( buffer_seed, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
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return( 0 );
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}
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/*
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* NV seed read/write helpers that fill the base seedfile
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*/
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static int write_nv_seed( unsigned char *buf, size_t buf_len )
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{
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FILE *f;
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if( buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE )
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return( -1 );
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if( ( f = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
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return( -1 );
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if( fwrite( buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f ) !=
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MBEDTLS_ENTROPY_BLOCK_SIZE )
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return( -1 );
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fclose( f );
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return( 0 );
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}
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static int read_nv_seed( unsigned char *buf, size_t buf_len )
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{
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FILE *f;
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if( buf_len != MBEDTLS_ENTROPY_BLOCK_SIZE )
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return( -1 );
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if( ( f = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
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return( -1 );
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if( fread( buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f ) !=
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MBEDTLS_ENTROPY_BLOCK_SIZE )
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return( -1 );
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fclose( f );
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return( 0 );
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}
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#endif /* MBEDTLS_ENTROPY_NV_SEED */
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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* depends_on:MBEDTLS_ENTROPY_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO */
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void entropy_seed_file( char *path, int ret )
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{
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mbedtls_entropy_context ctx;
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mbedtls_entropy_init( &ctx );
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TEST_ASSERT( mbedtls_entropy_write_seed_file( &ctx, path ) == ret );
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TEST_ASSERT( mbedtls_entropy_update_seed_file( &ctx, path ) == ret );
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exit:
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mbedtls_entropy_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_too_many_sources( )
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{
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mbedtls_entropy_context ctx;
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size_t i;
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mbedtls_entropy_init( &ctx );
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/*
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* It's hard to tell precisely when the error will occur,
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* since we don't know how many sources were automatically added.
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*/
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for( i = 0; i < MBEDTLS_ENTROPY_MAX_SOURCES; i++ )
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(void) mbedtls_entropy_add_source( &ctx, entropy_dummy_source, NULL,
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16, MBEDTLS_ENTROPY_SOURCE_WEAK );
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TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source, NULL,
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16, MBEDTLS_ENTROPY_SOURCE_WEAK )
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== MBEDTLS_ERR_ENTROPY_MAX_SOURCES );
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exit:
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mbedtls_entropy_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_func_len( int len, int ret )
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{
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mbedtls_entropy_context ctx;
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE + 10] = { 0 };
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unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE + 10] = { 0 };
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size_t i, j;
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mbedtls_entropy_init( &ctx );
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/*
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* See comments in mbedtls_entropy_self_test()
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*/
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for( i = 0; i < 8; i++ )
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{
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TEST_ASSERT( mbedtls_entropy_func( &ctx, buf, len ) == ret );
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for( j = 0; j < sizeof( buf ); j++ )
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acc[j] |= buf[j];
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}
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if( ret == 0 )
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for( j = 0; j < (size_t) len; j++ )
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TEST_ASSERT( acc[j] != 0 );
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for( j = len; j < sizeof( buf ); j++ )
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TEST_ASSERT( acc[j] == 0 );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_source_fail( char *path )
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{
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mbedtls_entropy_context ctx;
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int fail = -1;
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unsigned char buf[16];
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mbedtls_entropy_init( &ctx );
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TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source,
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&fail, 16,
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MBEDTLS_ENTROPY_SOURCE_WEAK )
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== 0 );
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TEST_ASSERT( mbedtls_entropy_func( &ctx, buf, sizeof( buf ) )
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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TEST_ASSERT( mbedtls_entropy_gather( &ctx )
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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#if defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_NV_SEED)
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TEST_ASSERT( mbedtls_entropy_write_seed_file( &ctx, path )
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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TEST_ASSERT( mbedtls_entropy_update_seed_file( &ctx, path )
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== MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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#else
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((void) path);
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#endif
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exit:
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mbedtls_entropy_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void entropy_threshold( int threshold, int chunk_size, int result )
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{
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mbedtls_entropy_context ctx;
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 };
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int ret;
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mbedtls_entropy_init( &ctx );
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TEST_ASSERT( mbedtls_entropy_add_source( &ctx, entropy_dummy_source,
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&chunk_size, threshold,
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MBEDTLS_ENTROPY_SOURCE_WEAK ) == 0 );
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entropy_dummy_calls = 0;
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ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) );
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if( result >= 0 )
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{
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TEST_ASSERT( ret == 0 );
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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// Two times as much calls due to the NV seed update
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result *= 2;
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#endif
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TEST_ASSERT( entropy_dummy_calls == (size_t) result );
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}
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else
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{
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TEST_ASSERT( ret == result );
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}
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exit:
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mbedtls_entropy_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO */
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void nv_seed_file_create()
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{
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
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memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
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TEST_ASSERT( write_nv_seed( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) == 0 );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_FS_IO:MBEDTLS_PLATFORM_NV_SEED_ALT */
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void entropy_nv_seed_std_io()
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{
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unsigned char io_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char check_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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memset( io_seed, 1, MBEDTLS_ENTROPY_BLOCK_SIZE );
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memset( check_seed, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
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mbedtls_platform_set_nv_seed( mbedtls_platform_std_nv_seed_read,
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mbedtls_platform_std_nv_seed_write );
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/* Check if platform NV read and write manipulate the same data */
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TEST_ASSERT( write_nv_seed( io_seed, MBEDTLS_ENTROPY_BLOCK_SIZE ) == 0 );
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TEST_ASSERT( mbedtls_nv_seed_read( check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE ) ==
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MBEDTLS_ENTROPY_BLOCK_SIZE );
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TEST_ASSERT( memcmp( io_seed, check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE ) == 0 );
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memset( check_seed, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
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/* Check if platform NV write and raw read manipulate the same data */
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TEST_ASSERT( mbedtls_nv_seed_write( io_seed, MBEDTLS_ENTROPY_BLOCK_SIZE ) ==
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MBEDTLS_ENTROPY_BLOCK_SIZE );
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TEST_ASSERT( read_nv_seed( check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE ) == 0 );
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TEST_ASSERT( memcmp( io_seed, check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE ) == 0 );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_ENTROPY_NV_SEED:MBEDTLS_PLATFORM_NV_SEED_ALT:MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
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void entropy_nv_seed( char *read_seed_str )
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{
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mbedtls_sha512_context accumulator;
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mbedtls_entropy_context ctx;
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unsigned char header[2];
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unsigned char entropy[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char empty[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char read_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char check_seed[MBEDTLS_ENTROPY_BLOCK_SIZE];
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unsigned char check_entropy[MBEDTLS_ENTROPY_BLOCK_SIZE];
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memset( entropy, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
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memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
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memset( buffer_seed, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
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memset( empty, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
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memset( check_seed, 2, MBEDTLS_ENTROPY_BLOCK_SIZE );
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memset( check_entropy, 3, MBEDTLS_ENTROPY_BLOCK_SIZE );
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// Set the initial NV seed to read
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unhexify( read_seed, read_seed_str );
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memcpy( buffer_seed, read_seed, MBEDTLS_ENTROPY_BLOCK_SIZE );
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// Make sure we read/write NV seed from our buffers
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mbedtls_platform_set_nv_seed( buffer_nv_seed_read, buffer_nv_seed_write );
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mbedtls_entropy_init( &ctx );
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entropy_clear_sources( &ctx );
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TEST_ASSERT( mbedtls_entropy_add_source( &ctx, mbedtls_nv_seed_poll, NULL,
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MBEDTLS_ENTROPY_BLOCK_SIZE,
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MBEDTLS_ENTROPY_SOURCE_STRONG ) == 0 );
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// Do an entropy run
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TEST_ASSERT( mbedtls_entropy_func( &ctx, entropy, sizeof( entropy ) ) == 0 );
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// Determine what should have happened with manual entropy internal logic
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// Only use the SHA-512 version to check
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// Init accumulator
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header[1] = MBEDTLS_ENTROPY_BLOCK_SIZE;
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mbedtls_sha512_starts( &accumulator, 0 );
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// First run for updating write_seed
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header[0] = 0;
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mbedtls_sha512_update( &accumulator, header, 2 );
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mbedtls_sha512_update( &accumulator, read_seed, MBEDTLS_ENTROPY_BLOCK_SIZE );
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mbedtls_sha512_finish( &accumulator, buf );
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memset( &accumulator, 0, sizeof( mbedtls_sha512_context ) );
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mbedtls_sha512_starts( &accumulator, 0 );
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mbedtls_sha512_update( &accumulator, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
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mbedtls_sha512( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, check_seed, 0 );
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// Second run for actual entropy (triggers mbedtls_entropy_update_nv_seed)
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header[0] = MBEDTLS_ENTROPY_SOURCE_MANUAL;
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mbedtls_sha512_update( &accumulator, header, 2 );
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mbedtls_sha512_update( &accumulator, empty, MBEDTLS_ENTROPY_BLOCK_SIZE );
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header[0] = 0;
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mbedtls_sha512_update( &accumulator, header, 2 );
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mbedtls_sha512_update( &accumulator, check_seed, MBEDTLS_ENTROPY_BLOCK_SIZE );
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mbedtls_sha512_finish( &accumulator, buf );
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mbedtls_sha512( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, check_entropy, 0 );
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// Check result of both NV file and entropy received with the manual calculations
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TEST_ASSERT( memcmp( check_seed, buffer_seed, MBEDTLS_ENTROPY_BLOCK_SIZE ) == 0 );
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TEST_ASSERT( memcmp( check_entropy, entropy, MBEDTLS_ENTROPY_BLOCK_SIZE ) == 0 );
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mbedtls_entropy_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
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void entropy_selftest( int result )
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{
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TEST_ASSERT( mbedtls_entropy_self_test( 1 ) == result );
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}
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/* END_CASE */
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