mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-10-19 07:21:22 +00:00
5ef5a9aeb4
Unify the three existing validation functions (with prediction resistance, with manual reseeding between generations, and with no reseeding) into a single function that supports these three scenarios plus a fourth one (reseed before the first generation). The four supported scenarios cover the three scenarios from the current CAVP test vectors (no reseed, reseed before generating, prediction resistance) plus a fourth scenario used by the existing test vectors (reseed after generating). (cherry picked from commit cee9bedee6bc1a8e2b22fa8a31647b62ebb8a0a4)
286 lines
9.9 KiB
Plaintext
286 lines
9.9 KiB
Plaintext
/* BEGIN_HEADER */
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "string.h"
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/* Modes for ctr_drbg_validate */
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enum reseed_mode
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{
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RESEED_NEVER, /* never reseed */
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RESEED_FIRST, /* instantiate, reseed, generate, generate */
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RESEED_SECOND, /* instantiate, generate, reseed, generate */
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RESEED_ALWAYS /* prediction resistance, no explicit reseed */
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};
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static size_t test_offset_idx;
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static size_t test_max_idx;
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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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const unsigned char *p = (unsigned char *) data;
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if( test_offset_idx + len > test_max_idx )
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return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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memcpy( buf, p + test_offset_idx, len );
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test_offset_idx += 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_CTR_DRBG_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE */
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void ctr_drbg_special_behaviours( )
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{
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mbedtls_ctr_drbg_context ctx;
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unsigned char output[512];
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unsigned char additional[512];
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mbedtls_ctr_drbg_init( &ctx );
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memset( output, 0, sizeof( output ) );
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memset( additional, 0, sizeof( additional ) );
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx,
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output, MBEDTLS_CTR_DRBG_MAX_REQUEST + 1,
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additional, 16 ) ==
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MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG );
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx,
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output, 16,
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additional, MBEDTLS_CTR_DRBG_MAX_INPUT + 1 ) ==
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MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
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TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, additional,
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MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + 1 ) ==
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MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
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mbedtls_ctr_drbg_set_entropy_len( &ctx, ~0 );
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TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, additional,
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MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ) ==
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MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
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exit:
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mbedtls_ctr_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void ctr_drbg_validate( int reseed_mode, char *nonce_string,
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int entropy_len_arg, char *entropy_string,
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char *reseed_string,
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char *add1_string, char *add2_string,
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char *result_string )
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{
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unsigned char entropy[144];
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unsigned char nonce[64];
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unsigned char reseed[32];
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unsigned char add1[48];
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unsigned char add2[48];
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mbedtls_ctr_drbg_context ctx;
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unsigned char buf[64];
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unsigned char result[64];
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size_t entropy_chunk_len = (size_t) entropy_len_arg;
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size_t nonce_len, reseed_len, add1_len, add2_len, result_len;
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test_offset_idx = 0;
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mbedtls_ctr_drbg_init( &ctx );
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test_max_idx = unhexify( entropy, entropy_string );
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nonce_len = unhexify( nonce, nonce_string );
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reseed_len = unhexify( reseed, reseed_string );
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add1_len = unhexify( add1, add1_string );
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add2_len = unhexify( add2, add2_string );
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result_len = unhexify( result, result_string );
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/* CTR_DRBG_Instantiate(entropy[:entropy_len], nonce, perso, <ignored>)
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* where nonce||perso = nonce[nonce_len] */
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TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len(
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&ctx,
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mbedtls_test_entropy_func, entropy,
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nonce, nonce_len,
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entropy_chunk_len ) == 0 );
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if( reseed_mode == RESEED_ALWAYS )
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mbedtls_ctr_drbg_set_prediction_resistance(
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&ctx,
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MBEDTLS_CTR_DRBG_PR_ON );
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if( reseed_mode == RESEED_FIRST )
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{
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/* CTR_DRBG_Reseed(entropy[idx:idx+entropy_len],
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* reseed[:reseed_len]) */
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TEST_ASSERT( mbedtls_ctr_drbg_reseed(
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&ctx,
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reseed, reseed_len ) == 0 );
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}
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/* CTR_DRBG_Generate(result_len * 8 bits, add1[:add1_len]) -> buf */
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/* Then reseed if prediction resistance is enabled. */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add(
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&ctx,
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buf, result_len,
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add1, add1_len ) == 0 );
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if( reseed_mode == RESEED_SECOND )
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{
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/* CTR_DRBG_Reseed(entropy[idx:idx+entropy_len],
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* reseed[:reseed_len]) */
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TEST_ASSERT( mbedtls_ctr_drbg_reseed(
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&ctx,
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reseed, reseed_len ) == 0 );
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}
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/* CTR_DRBG_Generate(result_len * 8 bits, add2[:add2_len]) -> buf */
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/* Then reseed if prediction resistance is enabled. */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add(
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&ctx,
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buf, result_len,
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add2, add2_len ) == 0 );
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TEST_ASSERT( memcmp( buf, result, result_len ) == 0 );
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exit:
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mbedtls_ctr_drbg_free( &ctx );
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void ctr_drbg_validate_no_reseed( char *add_init_string, char *entropy_string,
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char *add1_string, char *add2_string,
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char *result_string )
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{
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test_suite_ctr_drbg_validate( RESEED_NEVER, add_init_string,
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strlen( entropy_string ) / 2, entropy_string,
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"", add1_string, add2_string,
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result_string );
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goto exit;
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void ctr_drbg_validate_pr( char *add_init_string, char *entropy_string,
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char *add1_string, char *add2_string,
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char *result_string )
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{
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test_suite_ctr_drbg_validate( RESEED_ALWAYS, add_init_string,
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strlen( entropy_string ) / 6, entropy_string,
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"", add1_string, add2_string,
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result_string );
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goto exit;
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void ctr_drbg_validate_nopr( data_t * add_init, data_t * entropy,
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data_t * add1, data_t * add_reseed,
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char *add2_string, char *result_string )
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{
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test_suite_ctr_drbg_validate( RESEED_SECOND, add_init_string,
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strlen( entropy_string ) / 4, entropy_string,
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add_reseed_string, add1_string, add2_string,
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result_string );
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goto exit;
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void ctr_drbg_entropy_usage( )
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{
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unsigned char out[16];
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unsigned char add[16];
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unsigned char entropy[1024];
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mbedtls_ctr_drbg_context ctx;
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size_t i, reps = 10;
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size_t last_idx;
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mbedtls_ctr_drbg_init( &ctx );
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test_offset_idx = 0;
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test_max_idx = sizeof( entropy );
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memset( entropy, 0, sizeof( entropy ) );
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memset( out, 0, sizeof( out ) );
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memset( add, 0, sizeof( add ) );
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/* Init must use entropy */
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last_idx = test_offset_idx;
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TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctx, mbedtls_test_entropy_func, entropy, NULL, 0 ) == 0 );
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TEST_ASSERT( last_idx < test_offset_idx );
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/* By default, PR is off and reseed_interval is large,
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* so the next few calls should not use entropy */
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last_idx = test_offset_idx;
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for( i = 0; i < reps; i++ )
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{
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TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 );
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, out, sizeof( out ) - 4,
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add, sizeof( add ) ) == 0 );
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}
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TEST_ASSERT( last_idx == test_offset_idx );
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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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/* Set reseed_interval to the number of calls done,
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* so the next call should reseed */
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mbedtls_ctr_drbg_set_reseed_interval( &ctx, 2 * reps );
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TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( last_idx < test_offset_idx );
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/* The new few calls should not reseed */
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last_idx = test_offset_idx;
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for( i = 0; i < reps / 2; i++ )
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{
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TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, out, sizeof( out ) ,
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add, sizeof( add ) ) == 0 );
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}
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TEST_ASSERT( last_idx == test_offset_idx );
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/* Call update with too much data (sizeof entropy > MAX(_SEED)_INPUT)
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* (just make sure it doesn't cause memory corruption) */
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mbedtls_ctr_drbg_update( &ctx, entropy, sizeof( entropy ) );
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/* Now enable PR, so the next few calls should all reseed */
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mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
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TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( last_idx < test_offset_idx );
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/* Finally, check setting entropy_len */
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mbedtls_ctr_drbg_set_entropy_len( &ctx, 42 );
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last_idx = test_offset_idx;
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TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( test_offset_idx - last_idx == 42 );
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mbedtls_ctr_drbg_set_entropy_len( &ctx, 13 );
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last_idx = test_offset_idx;
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TEST_ASSERT( mbedtls_ctr_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( test_offset_idx - last_idx == 13 );
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exit:
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mbedtls_ctr_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 ctr_drbg_seed_file( char * path, int ret )
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{
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mbedtls_ctr_drbg_context ctx;
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mbedtls_ctr_drbg_init( &ctx );
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TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctx, rnd_std_rand, NULL, NULL, 0 ) == 0 );
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TEST_ASSERT( mbedtls_ctr_drbg_write_seed_file( &ctx, path ) == ret );
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TEST_ASSERT( mbedtls_ctr_drbg_update_seed_file( &ctx, path ) == ret );
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exit:
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mbedtls_ctr_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 ctr_drbg_selftest( )
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{
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TEST_ASSERT( mbedtls_ctr_drbg_self_test( 1 ) == 0 );
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}
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/* END_CASE */
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