mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-22 21:25:38 +01:00
912ffe414e
mbedtls_ctr_drbg_seed() always set the entropy length to the default, so a call to mbedtls_ctr_drbg_set_entropy_len() before seed() had no effect. Change this to the more intuitive behavior that set_entropy_len() sets the entropy length and seed() respects that and only uses the default entropy length if there was no call to set_entropy_len(). The former test-only function mbedtls_ctr_drbg_seed_entropy_len() is no longer used, but keep it for strict ABI compatibility.
296 lines
10 KiB
Plaintext
296 lines
10 KiB
Plaintext
/* BEGIN_HEADER */
|
|
#include "mbedtls/entropy.h"
|
|
#include "mbedtls/ctr_drbg.h"
|
|
#include "string.h"
|
|
|
|
/* Modes for ctr_drbg_validate */
|
|
enum reseed_mode
|
|
{
|
|
RESEED_NEVER, /* never reseed */
|
|
RESEED_FIRST, /* instantiate, reseed, generate, generate */
|
|
RESEED_SECOND, /* instantiate, generate, reseed, generate */
|
|
RESEED_ALWAYS /* prediction resistance, no explicit reseed */
|
|
};
|
|
|
|
static size_t test_offset_idx = 0;
|
|
static size_t test_max_idx = 0;
|
|
static int mbedtls_test_entropy_func( void *data, unsigned char *buf, size_t len )
|
|
{
|
|
const unsigned char *p = (unsigned char *) data;
|
|
if( test_offset_idx + len > test_max_idx )
|
|
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
|
|
memcpy( buf, p + test_offset_idx, len );
|
|
test_offset_idx += len;
|
|
return( 0 );
|
|
}
|
|
|
|
static void ctr_drbg_validate_internal( int reseed_mode, data_t * nonce,
|
|
int entropy_len_arg, data_t * entropy,
|
|
data_t * reseed,
|
|
data_t * add1, data_t * add2,
|
|
data_t * result )
|
|
{
|
|
mbedtls_ctr_drbg_context ctx;
|
|
unsigned char buf[64];
|
|
|
|
size_t entropy_chunk_len = (size_t) entropy_len_arg;
|
|
|
|
TEST_ASSERT( entropy_chunk_len <= sizeof( buf ) );
|
|
|
|
test_offset_idx = 0;
|
|
mbedtls_ctr_drbg_init( &ctx );
|
|
|
|
test_max_idx = entropy->len;
|
|
|
|
/* CTR_DRBG_Instantiate(entropy[:entropy->len], nonce, perso, <ignored>)
|
|
* where nonce||perso = nonce[nonce->len] */
|
|
mbedtls_ctr_drbg_set_entropy_len( &ctx, entropy_chunk_len );
|
|
TEST_ASSERT( mbedtls_ctr_drbg_seed(
|
|
&ctx,
|
|
mbedtls_test_entropy_func, entropy->x,
|
|
nonce->x, nonce->len ) == 0 );
|
|
if( reseed_mode == RESEED_ALWAYS )
|
|
mbedtls_ctr_drbg_set_prediction_resistance(
|
|
&ctx,
|
|
MBEDTLS_CTR_DRBG_PR_ON );
|
|
|
|
if( reseed_mode == RESEED_FIRST )
|
|
{
|
|
/* CTR_DRBG_Reseed(entropy[idx:idx+entropy->len],
|
|
* reseed[:reseed->len]) */
|
|
TEST_ASSERT( mbedtls_ctr_drbg_reseed(
|
|
&ctx,
|
|
reseed->x, reseed->len ) == 0 );
|
|
}
|
|
|
|
/* CTR_DRBG_Generate(result->len * 8 bits, add1[:add1->len]) -> buf */
|
|
/* Then reseed if prediction resistance is enabled. */
|
|
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add(
|
|
&ctx,
|
|
buf, result->len,
|
|
add1->x, add1->len ) == 0 );
|
|
|
|
|
|
if( reseed_mode == RESEED_SECOND )
|
|
{
|
|
/* CTR_DRBG_Reseed(entropy[idx:idx+entropy->len],
|
|
* reseed[:reseed->len]) */
|
|
TEST_ASSERT( mbedtls_ctr_drbg_reseed(
|
|
&ctx,
|
|
reseed->x, reseed->len ) == 0 );
|
|
}
|
|
|
|
/* CTR_DRBG_Generate(result->len * 8 bits, add2->x[:add2->len]) -> buf */
|
|
/* Then reseed if prediction resistance is enabled. */
|
|
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add(
|
|
&ctx,
|
|
buf, result->len,
|
|
add2->x, add2->len ) == 0 );
|
|
TEST_ASSERT( memcmp( buf, result->x, result->len ) == 0 );
|
|
|
|
exit:
|
|
mbedtls_ctr_drbg_free( &ctx );
|
|
}
|
|
|
|
/* END_HEADER */
|
|
|
|
/* BEGIN_DEPENDENCIES
|
|
* depends_on:MBEDTLS_CTR_DRBG_C
|
|
* END_DEPENDENCIES
|
|
*/
|
|
|
|
/* BEGIN_CASE */
|
|
void ctr_drbg_special_behaviours( )
|
|
{
|
|
mbedtls_ctr_drbg_context ctx;
|
|
unsigned char output[512];
|
|
unsigned char additional[512];
|
|
|
|
mbedtls_ctr_drbg_init( &ctx );
|
|
memset( output, 0, sizeof( output ) );
|
|
memset( additional, 0, sizeof( additional ) );
|
|
|
|
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx,
|
|
output, MBEDTLS_CTR_DRBG_MAX_REQUEST + 1,
|
|
additional, 16 ) ==
|
|
MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG );
|
|
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx,
|
|
output, 16,
|
|
additional, MBEDTLS_CTR_DRBG_MAX_INPUT + 1 ) ==
|
|
MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
|
|
|
|
TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, additional,
|
|
MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + 1 ) ==
|
|
MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
|
|
|
|
mbedtls_ctr_drbg_set_entropy_len( &ctx, ~0 );
|
|
TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, additional,
|
|
MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ) ==
|
|
MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
|
|
exit:
|
|
mbedtls_ctr_drbg_free( &ctx );
|
|
}
|
|
/* END_CASE */
|
|
|
|
|
|
/* BEGIN_CASE */
|
|
void ctr_drbg_validate_no_reseed( data_t * add_init, data_t * entropy,
|
|
data_t * add1, data_t * add2,
|
|
data_t * result_string )
|
|
{
|
|
data_t empty = { 0, 0 };
|
|
ctr_drbg_validate_internal( RESEED_NEVER, add_init,
|
|
entropy->len, entropy,
|
|
&empty, add1, add2,
|
|
result_string );
|
|
goto exit; // goto is needed to avoid warning ( no test assertions in func)
|
|
}
|
|
/* END_CASE */
|
|
|
|
/* BEGIN_CASE */
|
|
void ctr_drbg_validate_pr( data_t * add_init, data_t * entropy,
|
|
data_t * add1, data_t * add2,
|
|
data_t * result_string )
|
|
{
|
|
data_t empty = { 0, 0 };
|
|
ctr_drbg_validate_internal( RESEED_ALWAYS, add_init,
|
|
entropy->len / 3, entropy,
|
|
&empty, add1, add2,
|
|
result_string );
|
|
goto exit; // goto is needed to avoid warning ( no test assertions in func)
|
|
}
|
|
/* END_CASE */
|
|
|
|
/* BEGIN_CASE */
|
|
void ctr_drbg_validate_reseed_between( data_t * add_init, data_t * entropy,
|
|
data_t * add1, data_t * add_reseed,
|
|
data_t * add2, data_t * result_string )
|
|
{
|
|
ctr_drbg_validate_internal( RESEED_SECOND, add_init,
|
|
entropy->len / 2, entropy,
|
|
add_reseed, add1, add2,
|
|
result_string );
|
|
goto exit; // goto is needed to avoid warning ( no test assertions in func)
|
|
}
|
|
/* END_CASE */
|
|
|
|
/* BEGIN_CASE */
|
|
void ctr_drbg_validate_reseed_first( data_t * add_init, data_t * entropy,
|
|
data_t * add1, data_t * add_reseed,
|
|
data_t * add2, data_t * result_string )
|
|
{
|
|
ctr_drbg_validate_internal( RESEED_FIRST, add_init,
|
|
entropy->len / 2, entropy,
|
|
add_reseed, add1, add2,
|
|
result_string );
|
|
goto exit; // goto is needed to avoid warning ( no test assertions in func)
|
|
}
|
|
/* 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;
|
|
size_t last_idx;
|
|
|
|
mbedtls_ctr_drbg_init( &ctx );
|
|
test_offset_idx = 0;
|
|
test_max_idx = sizeof( entropy );
|
|
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_test_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).
|
|
* Make sure it's detected as an error and doesn't cause memory
|
|
* corruption. */
|
|
TEST_ASSERT( mbedtls_ctr_drbg_update_ret(
|
|
&ctx, entropy, sizeof( entropy ) ) != 0 );
|
|
|
|
/* 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( 1 ) == 0 );
|
|
}
|
|
/* END_CASE */
|