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CTR_DRBG: support set_entropy_len() before seed()

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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.
This commit is contained in:
Gilles Peskine 2019-10-04 12:15:55 +02:00
parent c4280acfa0
commit 912ffe414e
3 changed files with 35 additions and 40 deletions
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6
tests/suites/test_suite_ctr_drbg.function
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@ -44,11 +44,11 @@ static void ctr_drbg_validate_internal( int reseed_mode, data_t * nonce,
/* CTR_DRBG_Instantiate(entropy[:entropy->len], nonce, perso, <ignored>)
* where nonce||perso = nonce[nonce->len] */
TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_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,
entropy_chunk_len ) == 0 );
nonce->x, nonce->len ) == 0 );
if( reseed_mode == RESEED_ALWAYS )
mbedtls_ctr_drbg_set_prediction_resistance(
&ctx,