mbedtls/tests/suites/test_suite_hmac_drbg.function

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/* BEGIN_HEADER */
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#include "mbedtls/hmac_drbg.h"
typedef struct
{
unsigned char *p;
size_t len;
} entropy_ctx;
int mbedtls_entropy_func( void *data, unsigned char *buf, size_t len )
{
entropy_ctx *ctx = (entropy_ctx *) data;
if( len > ctx->len )
return( -1 );
memcpy( buf, ctx->p, len );
ctx->p += len;
ctx->len -= len;
return( 0 );
}
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_HMAC_DRBG_C
* END_DEPENDENCIES
*/
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/* BEGIN_CASE */
void hmac_drbg_entropy_usage( int md_alg )
{
unsigned char out[16];
unsigned char buf[1024];
const mbedtls_md_info_t *md_info;
mbedtls_hmac_drbg_context ctx;
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entropy_ctx entropy;
size_t last_len, i, reps = 10;
memset( buf, 0, sizeof( buf ) );
memset( out, 0, sizeof( out ) );
entropy.len = sizeof( buf );
entropy.p = buf;
md_info = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md_info != NULL );
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/* Init must use entropy */
last_len = entropy.len;
TEST_ASSERT( mbedtls_hmac_drbg_init( &ctx, md_info, mbedtls_entropy_func, &entropy,
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NULL, 0 ) == 0 );
TEST_ASSERT( entropy.len < last_len );
/* By default, PR is off and reseed_interval is large,
* so the next few calls should not use entropy */
last_len = entropy.len;
for( i = 0; i < reps; i++ )
{
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) - 4 ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, out, sizeof( out ) - 4,
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buf, 16 ) == 0 );
}
TEST_ASSERT( entropy.len == last_len );
/* 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_hmac_drbg_set_reseed_interval( &ctx, 2 * reps );
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( entropy.len < last_len );
/* The new few calls should not reseed */
last_len = entropy.len;
for( i = 0; i < reps / 2; i++ )
{
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, out, sizeof( out ) ,
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buf, 16 ) == 0 );
}
TEST_ASSERT( entropy.len == last_len );
/* Now enable PR, so the next few calls should all reseed */
mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( entropy.len < last_len );
/* Finally, check setting entropy_len */
mbedtls_hmac_drbg_set_entropy_len( &ctx, 42 );
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last_len = entropy.len;
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( (int) last_len - entropy.len == 42 );
mbedtls_hmac_drbg_set_entropy_len( &ctx, 13 );
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last_len = entropy.len;
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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TEST_ASSERT( (int) last_len - entropy.len == 13 );
exit:
mbedtls_hmac_drbg_free( &ctx );
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}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_FS_IO */
void hmac_drbg_seed_file( int md_alg, char *path, int ret )
{
const mbedtls_md_info_t *md_info;
mbedtls_hmac_drbg_context ctx;
md_info = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md_info != NULL );
TEST_ASSERT( mbedtls_hmac_drbg_init( &ctx, md_info, rnd_std_rand, NULL,
NULL, 0 ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_write_seed_file( &ctx, path ) == ret );
TEST_ASSERT( mbedtls_hmac_drbg_update_seed_file( &ctx, path ) == ret );
exit:
mbedtls_hmac_drbg_free( &ctx );
}
/* END_CASE */
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/* BEGIN_CASE */
void hmac_drbg_buf( int md_alg )
{
unsigned char out[16];
unsigned char buf[100];
const mbedtls_md_info_t *md_info;
mbedtls_hmac_drbg_context ctx;
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size_t i;
memset( buf, 0, sizeof( buf ) );
memset( out, 0, sizeof( out ) );
md_info = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md_info != NULL );
TEST_ASSERT( mbedtls_hmac_drbg_init_buf( &ctx, md_info, buf, sizeof( buf ) ) == 0 );
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/* Make sure it never tries to reseed (would segfault otherwise) */
mbedtls_hmac_drbg_set_reseed_interval( &ctx, 3 );
mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
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for( i = 0; i < 30; i++ )
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
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exit:
mbedtls_hmac_drbg_free( &ctx );
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}
/* END_CASE */
/* BEGIN_CASE */
void hmac_drbg_no_reseed( int md_alg,
char *entropy_hex, char *custom_hex,
char *add1_hex, char *add2_hex,
char *output_hex )
{
unsigned char data[1024];
unsigned char entropy[512];
unsigned char custom[512];
unsigned char add1[512];
unsigned char add2[512];
unsigned char output[512];
unsigned char my_output[512];
size_t custom_len, add1_len, add2_len, out_len;
entropy_ctx p_entropy;
const mbedtls_md_info_t *md_info;
mbedtls_hmac_drbg_context ctx;
memset( my_output, 0, sizeof my_output );
custom_len = unhexify( custom, custom_hex );
add1_len = unhexify( add1, add1_hex );
add2_len = unhexify( add2, add2_hex );
out_len = unhexify( output, output_hex );
p_entropy.len = unhexify( entropy, entropy_hex );
p_entropy.p = entropy;
md_info = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md_info != NULL );
/* Test the simplified buffer-based variant */
memcpy( data, entropy, p_entropy.len );
memcpy( data + p_entropy.len, custom, custom_len );
TEST_ASSERT( mbedtls_hmac_drbg_init_buf( &ctx, md_info,
data, p_entropy.len + custom_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add1, add1_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add2, add2_len ) == 0 );
/* clear for second run */
mbedtls_hmac_drbg_free( &ctx );
TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
/* And now the normal entropy-based variant */
TEST_ASSERT( mbedtls_hmac_drbg_init( &ctx, md_info, mbedtls_entropy_func, &p_entropy,
custom, custom_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add1, add1_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add2, add2_len ) == 0 );
TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
exit:
mbedtls_hmac_drbg_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void hmac_drbg_nopr( int md_alg,
char *entropy_hex, char *custom_hex,
char *add1_hex, char *add2_hex, char *add3_hex,
char *output_hex )
{
unsigned char entropy[512];
unsigned char custom[512];
unsigned char add1[512];
unsigned char add2[512];
unsigned char add3[512];
unsigned char output[512];
unsigned char my_output[512];
size_t custom_len, add1_len, add2_len, add3_len, out_len;
entropy_ctx p_entropy;
const mbedtls_md_info_t *md_info;
mbedtls_hmac_drbg_context ctx;
memset( my_output, 0, sizeof my_output );
custom_len = unhexify( custom, custom_hex );
add1_len = unhexify( add1, add1_hex );
add2_len = unhexify( add2, add2_hex );
add3_len = unhexify( add3, add3_hex );
out_len = unhexify( output, output_hex );
p_entropy.len = unhexify( entropy, entropy_hex );
p_entropy.p = entropy;
md_info = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md_info != NULL );
TEST_ASSERT( mbedtls_hmac_drbg_init( &ctx, md_info, mbedtls_entropy_func, &p_entropy,
custom, custom_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_reseed( &ctx, add1, add1_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add2, add2_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add3, add3_len ) == 0 );
TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
exit:
mbedtls_hmac_drbg_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void hmac_drbg_pr( int md_alg,
char *entropy_hex, char *custom_hex,
char *add1_hex, char *add2_hex,
char *output_hex )
{
unsigned char entropy[512];
unsigned char custom[512];
unsigned char add1[512];
unsigned char add2[512];
unsigned char output[512];
unsigned char my_output[512];
size_t custom_len, add1_len, add2_len, out_len;
entropy_ctx p_entropy;
const mbedtls_md_info_t *md_info;
mbedtls_hmac_drbg_context ctx;
memset( my_output, 0, sizeof my_output );
custom_len = unhexify( custom, custom_hex );
add1_len = unhexify( add1, add1_hex );
add2_len = unhexify( add2, add2_hex );
out_len = unhexify( output, output_hex );
p_entropy.len = unhexify( entropy, entropy_hex );
p_entropy.p = entropy;
md_info = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md_info != NULL );
TEST_ASSERT( mbedtls_hmac_drbg_init( &ctx, md_info, mbedtls_entropy_func, &p_entropy,
custom, custom_len ) == 0 );
mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add1, add1_len ) == 0 );
TEST_ASSERT( mbedtls_hmac_drbg_random_with_add( &ctx, my_output, out_len,
add2, add2_len ) == 0 );
TEST_ASSERT( memcmp( my_output, output, out_len ) == 0 );
exit:
mbedtls_hmac_drbg_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
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void hmac_drbg_selftest( )
{
TEST_ASSERT( mbedtls_hmac_drbg_self_test( 0 ) == 0 );
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}
/* END_CASE */