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https://github.com/Mbed-TLS/mbedtls.git
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ctr_drbg tests: unify validate functions
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)
This commit is contained in:
Gilles Peskine
Nir Sonnenschein
parent
4c78665ccd
commit
5ef5a9aeb4
@ -3,6 +3,15 @@
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/ctr_drbg.h"
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#include "string.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_offset_idx;
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static size_t test_max_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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static int mbedtls_test_entropy_func( void *data, unsigned char *buf, size_t len )
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@ -55,74 +64,107 @@ exit:
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/* END_CASE */
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/* END_CASE */
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/* BEGIN_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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/* BEGIN_CASE */
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int entropy_len_arg, char *entropy_string,
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void ctr_drbg_validate_no_reseed( char *add_init_string, 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 *add1_string, char *add2_string,
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char *result_string )
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char *result_string )
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{
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{
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unsigned char entropy[512];
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unsigned char entropy[144];
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unsigned char add_init[512];
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unsigned char nonce[64];
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unsigned char add1[512];
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unsigned char reseed[32];
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unsigned char add2[512];
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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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mbedtls_ctr_drbg_context ctx;
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unsigned char buf[512];
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unsigned char buf[64];
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unsigned char result[512];
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unsigned char result[64];
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size_t entropy_len, add_init_len, add1_len, add2_len, result_len;
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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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mbedtls_ctr_drbg_init( &ctx );
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entropy_len = unhexify( entropy, entropy_string );
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test_max_idx = unhexify( entropy, entropy_string );
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add_init_len = unhexify( add_init, add_init_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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add1_len = unhexify( add1, add1_string );
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add2_len = unhexify( add2, add2_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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result_len = unhexify( result, result_string );
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test_offset_idx = 0;
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test_max_idx = entropy_len;
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/* CTR_DRBG_Instantiate(entropy[:entropy_len], nonce, perso, <ignored>)
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/* CTR_DRBG_Instantiate(entropy[:entropy_len], nonce, perso, <ignored>)
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* where nonce||perso = add_init[add_init_len] */
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* where nonce||perso = nonce[nonce_len] */
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TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( &ctx, mbedtls_test_entropy_func, entropy, add_init, add_init_len, entropy_len ) == 0 );
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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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/* CTR_DRBG_Generate(result_len * 8 bits, add1[:add1_len]) -> buf */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, result_len, add1, add1_len ) == 0 );
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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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/* CTR_DRBG_Generate(result_len * 8 bits, add2[:add2_len]) -> buf */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, result_len, add2, add2_len ) == 0 );
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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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TEST_ASSERT( memcmp( buf, result, result_len ) == 0 );
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exit:
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exit:
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mbedtls_ctr_drbg_free( &ctx );
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mbedtls_ctr_drbg_free( &ctx );
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}
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}
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/* END_CASE */
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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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char *result_string )
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{
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{
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mbedtls_ctr_drbg_context ctx;
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test_suite_ctr_drbg_validate( RESEED_ALWAYS, add_init_string,
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unsigned char buf[512];
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strlen( entropy_string ) / 6, entropy_string,
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unsigned char result[512];
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"", add1_string, add2_string,
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size_t entropy_len, add_init_len, add1_len, add2_len, result_len;
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result_string );
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goto exit;
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mbedtls_ctr_drbg_init( &ctx );
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entropy_len = unhexify( entropy, entropy_string );
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result_len = unhexify( result, result_string );
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test_offset_idx = 0;
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test_max_idx = entropy_len;
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/* CTR_DRBG_Instantiate(entropy[:entropy_len/3], nonce, perso, <ignored>)
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* where nonce||perso = add_init[add_init_len] */
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TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( &ctx, mbedtls_test_entropy_func, entropy, add_init, add_init_len, entropy_len / 3 ) == 0 );
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mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
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/* CTR_DRBG_Generate(result_len * 8 bits, add1[:add1_len]) -> buf */
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/* Then reseed because of prediction resistance. */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, result_len, add1, add1_len ) == 0 );
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/* CTR_DRBG_Generate(result_len * 8 bits, add2[:add2_len]) -> buf */
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/* Then reseed because of prediction resistance. */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, result_len, 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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}
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/* END_CASE */
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/* END_CASE */
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@ -131,32 +173,11 @@ 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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data_t * add1, data_t * add_reseed,
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char *add2_string, char *result_string )
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char *add2_string, char *result_string )
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{
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{
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mbedtls_ctr_drbg_context ctx;
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test_suite_ctr_drbg_validate( RESEED_SECOND, add_init_string,
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unsigned char buf[512];
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strlen( entropy_string ) / 4, entropy_string,
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unsigned char result[512];
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add_reseed_string, add1_string, add2_string,
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size_t entropy_len, add_init_len, add1_len, add_reseed_len, add2_len, result_len;
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result_string );
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goto exit;
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mbedtls_ctr_drbg_init( &ctx );
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entropy_len = unhexify( entropy, entropy_string );
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result_len = unhexify( result, result_string );
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test_offset_idx = 0;
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test_max_idx = entropy_len;
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/* CTR_DRBG_Instantiate(entropy[:entropy_len/2], nonce, perso, <ignored>)
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* where nonce||perso = add_init[add_init_len] */
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TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( &ctx, mbedtls_test_entropy_func, entropy, add_init, add_init_len, entropy_len / 2 ) == 0 );
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/* CTR_DRBG_Generate(16 * 8 bits, add1[:add1_len]) -> buf */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, result_len, add1, add1_len ) == 0 );
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/* CTR_DRBG_Reseed(entropy[entropy_len/2:entropy_len], add_reseed[:add_reseed_len]) */
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TEST_ASSERT( hexcmp( buf, result_str->x, 16, result_str->len ) == 0 );
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/* CTR_DRBG_Generate(16 * 8 bits, add2[:add2_len]) -> buf */
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TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, result_len, 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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}
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/* END_CASE */
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/* END_CASE */
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