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hmac_drbg: set_entropy_len can now return an error

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Make mbedtls_hmac_drbg_set_entropy_len return an error
in case of a too long entropy length setting.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2020-07-18 06:05:03 -04:00
parent 9167aa96f8
commit 6bc37fa4e2
No known key found for this signature in database
GPG key ID: 89A90840DC388527
3 changed files with 11 additions and 5 deletions
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6
include/mbedtls/hmac_drbg.h
View file

@ -228,9 +228,11 @@ void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx
*
* \param ctx The HMAC_DRBG context.
* \param len The amount of entropy to grab, in bytes.
*
* \return \c 0 if \p len is valid, MBEDTLS_HMAC_DRBG_MAX_INPUT otherwise.
*/
void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx,
size_t len );
int mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx,
size_t len );
/**
* \brief Set the reseed interval.

6
library/hmac_drbg.c
View file

@ -390,9 +390,13 @@ void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx
/*
* Set entropy length grabbed for seeding
*/
void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, size_t len )
int mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, size_t len )
{
if( len > MBEDTLS_HMAC_DRBG_MAX_INPUT )
return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
ctx->entropy_len = len;
return 0;
}
/*

4
tests/suites/test_suite_hmac_drbg.function
View file

@ -94,12 +94,12 @@ void hmac_drbg_entropy_usage( int md_alg )
TEST_ASSERT( entropy.len < last_len );
/* Finally, check setting entropy_len */
mbedtls_hmac_drbg_set_entropy_len( &ctx, 42 );
TEST_ASSERT( mbedtls_hmac_drbg_set_entropy_len( &ctx, 42 ) == 0 );
last_len = entropy.len;
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( (int) last_len - entropy.len == 42 );
mbedtls_hmac_drbg_set_entropy_len( &ctx, 13 );
TEST_ASSERT( mbedtls_hmac_drbg_set_entropy_len( &ctx, 13 ) == 0 );
last_len = entropy.len;
TEST_ASSERT( mbedtls_hmac_drbg_random( &ctx, out, sizeof( out ) ) == 0 );
TEST_ASSERT( (int) last_len - entropy.len == 13 );