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/* BEGIN_HEADER */
#include "mbedtls/ctr_drbg.h"
int test_offset_idx;
int mbedtls_entropy_func( void *data, unsigned char *buf, size_t len )
{
const unsigned char *p = (unsigned char *) data;
memcpy( buf, p + test_offset_idx, len );
test_offset_idx += len;
return( 0 );
}
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_CTR_DRBG_C
* END_DEPENDENCIES
*/
/* BEGIN_CASE */
void ctr_drbg_validate_pr( char *add_init_string, char *entropy_string,
char *add1_string, char *add2_string,
char *result_str )
{
unsigned char entropy[512];
unsigned char add_init[512];
unsigned char add1[512];
unsigned char add2[512];
mbedtls_ctr_drbg_context ctx;
unsigned char buf[512];
unsigned char output_str[512];
int add_init_len, add1_len, add2_len;
mbedtls_ctr_drbg_init( &ctx );
memset( output_str, 0, 512 );
unhexify( entropy, entropy_string );
add_init_len = unhexify( add_init, add_init_string );
add1_len = unhexify( add1, add1_string );
add2_len = unhexify( add2, add2_string );
test_offset_idx = 0;
TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( &ctx, mbedtls_entropy_func, entropy, add_init, add_init_len, 32 ) == 0 );
mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add1, add1_len ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add2, add2_len ) == 0 );
hexify( output_str, buf, 16 );
TEST_ASSERT( strcmp( (char *) output_str, result_str ) == 0 );
exit:
mbedtls_ctr_drbg_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void ctr_drbg_validate_nopr( char *add_init_string, char *entropy_string,
char *add1_string, char *add_reseed_string,
char *add2_string, char *result_str )
{
unsigned char entropy[512];
unsigned char add_init[512];
unsigned char add1[512];
unsigned char add_reseed[512];
unsigned char add2[512];
mbedtls_ctr_drbg_context ctx;
unsigned char buf[512];
unsigned char output_str[512];
int add_init_len, add1_len, add_reseed_len, add2_len;
mbedtls_ctr_drbg_init( &ctx );
memset( output_str, 0, 512 );
unhexify( entropy, entropy_string );
add_init_len = unhexify( add_init, add_init_string );
add1_len = unhexify( add1, add1_string );
add_reseed_len = unhexify( add_reseed, add_reseed_string );
add2_len = unhexify( add2, add2_string );
test_offset_idx = 0;
TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( &ctx, mbedtls_entropy_func, entropy, add_init, add_init_len, 32 ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add1, add1_len ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, add_reseed, add_reseed_len ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add2, add2_len ) == 0 );
hexify( output_str, buf, 16 );
TEST_ASSERT( strcmp( (char *) output_str, result_str ) == 0 );
exit:
mbedtls_ctr_drbg_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void ctr_drbg_entropy_usage( )
{
unsigned char out[16];
unsigned char add[16];
unsigned char entropy[1024];
mbedtls_ctr_drbg_context ctx;
size_t i, reps = 10;
int last_idx;
mbedtls_ctr_drbg_init( &ctx );
test_offset_idx = 0;
memset( entropy, 0, sizeof( entropy ) );
memset( out, 0, sizeof( out ) );
memset( add, 0, sizeof( add ) );
/* Init must use entropy */
last_idx = test_offset_idx;
TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctx, mbedtls_entropy_func, entropy, NULL, 0 ) == 0 );
TEST_ASSERT( last_idx < test_offset_idx );
/* By default, PR is off and reseed_interval is large,
* so the next few calls should not use entropy */
last_idx = test_offset_idx;
for( i = 0; i < reps; i++ )
{
TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, out, sizeof( out ) - 4,
add, sizeof( add ) ) == 0 );
}
TEST_ASSERT( last_idx == test_offset_idx );
/* While at it, make sure we didn't write past the requested length */
TEST_ASSERT( out[sizeof( out ) - 4] == 0 );
TEST_ASSERT( out[sizeof( out ) - 3] == 0 );
TEST_ASSERT( out[sizeof( out ) - 2] == 0 );
TEST_ASSERT( out[sizeof( out ) - 1] == 0 );
/* Set reseed_interval to the number of calls done,
* so the next call should reseed */
mbedtls_ctr_drbg_set_reseed_interval( &ctx, 2 * reps );
TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( last_idx < test_offset_idx );
/* The new few calls should not reseed */
last_idx = test_offset_idx;
for( i = 0; i < reps / 2; i++ )
{
TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, out, sizeof( out ) ,
add, sizeof( add ) ) == 0 );
}
TEST_ASSERT( last_idx == test_offset_idx );
/* Call update with too much data (sizeof entropy > MAX(_SEED)_INPUT)
* (just make sure it doesn't cause memory corruption) */
mbedtls_ctr_drbg_update( &ctx, entropy, sizeof( entropy ) );
/* Now enable PR, so the next few calls should all reseed */
mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( last_idx < test_offset_idx );
/* Finally, check setting entropy_len */
mbedtls_ctr_drbg_set_entropy_len( &ctx, 42 );
last_idx = test_offset_idx;
TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( test_offset_idx - last_idx == 42 );
mbedtls_ctr_drbg_set_entropy_len( &ctx, 13 );
last_idx = test_offset_idx;
TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( test_offset_idx - last_idx == 13 );
exit:
mbedtls_ctr_drbg_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_FS_IO */
void ctr_drbg_seed_file( char *path, int ret )
{
mbedtls_ctr_drbg_context ctx;
mbedtls_ctr_drbg_init( &ctx );
TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctx, rnd_std_rand, NULL, NULL, 0 ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_write_seed_file( &ctx, path ) == ret );
TEST_ASSERT( mbedtls_ctr_drbg_update_seed_file( &ctx, path ) == ret );
exit:
mbedtls_ctr_drbg_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
void ctr_drbg_selftest( )
{
TEST_ASSERT( mbedtls_ctr_drbg_self_test( 0 ) == 0 );
}
/* END_CASE */
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