6aceb51e43
mbedtls_ctr_drbg_set_reseed_interval() and mbedtls_hmac_drbg_set_reseed_interval() can now be called before their seed functions and the reseed_interval value will persist. Previously it would be overwritten with the default value. *_drbg_reseed_interval is now set in init() and free(). mbedtls_ctr_drbg_free() and mbedtls_hmac_drbg_free() now reset the drbg context to the state immediately after init(). Tests: - Added test to check that DRBG reseeds when reseed_counter reaches reseed_interval, if reseed_interval set before seed and reseed_interval is less than MBEDTLS_CTR_DRBG_RESEED_INTERVAL. Signed-off-by: gacquroff <gavina352@gmail.com>
295 lines
10 KiB
Text
295 lines
10 KiB
Text
/* BEGIN_HEADER */
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#include "mbedtls/hmac_drbg.h"
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#include "string.h"
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typedef struct
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{
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unsigned char *p;
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size_t len;
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} entropy_ctx;
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static int mbedtls_test_entropy_func( void *data, unsigned char *buf, size_t len )
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{
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entropy_ctx *ctx = (entropy_ctx *) data;
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if( len > ctx->len )
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return( -1 );
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memcpy( buf, ctx->p, len );
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ctx->p += len;
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ctx->len -= len;
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return( 0 );
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}
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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* depends_on:MBEDTLS_HMAC_DRBG_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE */
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void hmac_drbg_entropy_usage( int md_alg )
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{
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unsigned char out[16];
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unsigned char buf[1024];
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const mbedtls_md_info_t *md_info;
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mbedtls_hmac_drbg_context ctx;
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entropy_ctx entropy;
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size_t i, reps = 10;
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size_t default_entropy_len;
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size_t expected_consumed_entropy = 0;
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mbedtls_hmac_drbg_init( &ctx );
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memset( buf, 0, sizeof( buf ) );
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memset( out, 0, sizeof( out ) );
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entropy.len = sizeof( buf );
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entropy.p = buf;
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md_info = mbedtls_md_info_from_type( md_alg );
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TEST_ASSERT( md_info != NULL );
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if( mbedtls_md_get_size( md_info ) <= 20 )
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default_entropy_len = 16;
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else if( mbedtls_md_get_size( md_info ) <= 28 )
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default_entropy_len = 24;
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else
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default_entropy_len = 32;
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/* Set reseed interval before seed */
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mbedtls_hmac_drbg_set_reseed_interval( &ctx, 2 * reps );
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/* Init must use entropy */
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TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &entropy,
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NULL, 0 ) == 0 );
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/* default_entropy_len of entropy, plus half as much for the nonce */
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expected_consumed_entropy += default_entropy_len * 3 / 2;
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TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy );
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/* By default, PR is off, and reseed interval was set to
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* 2 * reps so the next few calls should not use entropy */
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for( i = 0; i < reps; i++ )
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{
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TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, out, sizeof( out ) - 4,
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buf, 16 ) == 0 );
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}
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TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy );
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/* While at it, make sure we didn't write past the requested length */
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TEST_ASSERT( out[sizeof( out ) - 4] == 0 );
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TEST_ASSERT( out[sizeof( out ) - 3] == 0 );
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TEST_ASSERT( out[sizeof( out ) - 2] == 0 );
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TEST_ASSERT( out[sizeof( out ) - 1] == 0 );
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/* There have been 2 * reps calls to random. The next call should reseed */
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TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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expected_consumed_entropy += default_entropy_len;
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TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy );
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/* Set reseed interval after seed */
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mbedtls_hmac_drbg_set_reseed_interval( &ctx, 4 * reps + 1);
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/* The new few calls should not reseed */
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for( i = 0; i < (2 * reps); i++ )
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{
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TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, out, sizeof( out ) ,
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buf, 16 ) == 0 );
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}
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TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy );
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/* Now enable PR, so the next few calls should all reseed */
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mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
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TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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expected_consumed_entropy += default_entropy_len;
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TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy );
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/* Finally, check setting entropy_len */
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mbedtls_hmac_drbg_set_entropy_len( &ctx, 42 );
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TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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expected_consumed_entropy += 42;
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TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy );
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mbedtls_hmac_drbg_set_entropy_len( &ctx, 13 );
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TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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expected_consumed_entropy += 13;
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TEST_EQUAL( sizeof( buf ) - entropy.len, expected_consumed_entropy );
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exit:
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mbedtls_hmac_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_FS_IO */
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void hmac_drbg_seed_file( int md_alg, char * path, int ret )
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{
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const mbedtls_md_info_t *md_info;
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mbedtls_hmac_drbg_context ctx;
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mbedtls_hmac_drbg_init( &ctx );
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md_info = mbedtls_md_info_from_type( md_alg );
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TEST_ASSERT( md_info != NULL );
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TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info,
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mbedtls_test_rnd_std_rand, NULL,
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NULL, 0 ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_write_seed_file( &ctx, path ) == ret );
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TEST_ASSERT( mbedtls_hmac_drbg_update_seed_file( &ctx, path ) == ret );
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exit:
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mbedtls_hmac_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void hmac_drbg_buf( int md_alg )
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{
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unsigned char out[16];
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unsigned char buf[100];
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const mbedtls_md_info_t *md_info;
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mbedtls_hmac_drbg_context ctx;
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size_t i;
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mbedtls_hmac_drbg_init( &ctx );
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memset( buf, 0, sizeof( buf ) );
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memset( out, 0, sizeof( out ) );
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md_info = mbedtls_md_info_from_type( md_alg );
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TEST_ASSERT( md_info != NULL );
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TEST_ASSERT( mbedtls_hmac_drbg_seed_buf( &ctx, md_info, buf, sizeof( buf ) ) == 0 );
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/* Make sure it never tries to reseed (would segfault otherwise) */
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mbedtls_hmac_drbg_set_reseed_interval( &ctx, 3 );
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mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
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for( i = 0; i < 30; i++ )
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TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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exit:
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mbedtls_hmac_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void hmac_drbg_no_reseed( int md_alg, data_t * entropy,
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data_t * custom, data_t * add1,
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data_t * add2, data_t * output )
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{
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unsigned char data[1024];
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unsigned char my_output[512];
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entropy_ctx p_entropy;
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const mbedtls_md_info_t *md_info;
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mbedtls_hmac_drbg_context ctx;
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mbedtls_hmac_drbg_init( &ctx );
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p_entropy.p = entropy->x;
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p_entropy.len = entropy->len;
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md_info = mbedtls_md_info_from_type( md_alg );
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TEST_ASSERT( md_info != NULL );
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/* Test the simplified buffer-based variant */
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memcpy( data, entropy->x, p_entropy.len );
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memcpy( data + p_entropy.len, custom->x, custom->len );
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TEST_ASSERT( mbedtls_hmac_drbg_seed_buf( &ctx, md_info,
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data, p_entropy.len + custom->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add1->x, add1->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add2->x, add2->len ) == 0 );
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/* Reset context for second run */
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mbedtls_hmac_drbg_free( &ctx );
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TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
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/* And now the normal entropy-based variant */
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TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy,
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custom->x, custom->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add1->x, add1->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add2->x, add2->len ) == 0 );
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TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
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exit:
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mbedtls_hmac_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void hmac_drbg_nopr( int md_alg, data_t * entropy, data_t * custom,
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data_t * add1, data_t * add2, data_t * add3,
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data_t * output )
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{
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unsigned char my_output[512];
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entropy_ctx p_entropy;
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const mbedtls_md_info_t *md_info;
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mbedtls_hmac_drbg_context ctx;
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mbedtls_hmac_drbg_init( &ctx );
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p_entropy.p = entropy->x;
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p_entropy.len = entropy->len;
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md_info = mbedtls_md_info_from_type( md_alg );
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TEST_ASSERT( md_info != NULL );
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TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy,
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custom->x, custom->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_reseed( &ctx, add1->x, add1->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add2->x, add2->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add3->x, add3->len ) == 0 );
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TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
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exit:
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mbedtls_hmac_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void hmac_drbg_pr( int md_alg, data_t * entropy, data_t * custom,
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data_t * add1, data_t * add2, data_t * output )
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{
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unsigned char my_output[512];
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entropy_ctx p_entropy;
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const mbedtls_md_info_t *md_info;
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mbedtls_hmac_drbg_context ctx;
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mbedtls_hmac_drbg_init( &ctx );
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p_entropy.p = entropy->x;
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p_entropy.len = entropy->len;
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md_info = mbedtls_md_info_from_type( md_alg );
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TEST_ASSERT( md_info != NULL );
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TEST_ASSERT( mbedtls_hmac_drbg_seed( &ctx, md_info, mbedtls_test_entropy_func, &p_entropy,
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custom->x, custom->len ) == 0 );
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mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add1->x, add1->len ) == 0 );
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TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, output->len,
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add2->x, add2->len ) == 0 );
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TEST_ASSERT( memcmp( my_output, output->x, output->len ) == 0 );
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exit:
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mbedtls_hmac_drbg_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 hmac_drbg_selftest( )
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{
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TEST_ASSERT( mbedtls_hmac_drbg_self_test( 1 ) == 0 );
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}
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/* END_CASE */
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