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HMAC_DRBG: clean stack buffers

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Wipe stack buffers that may contain sensitive data (data that
contributes to the DRBG state.
This commit is contained in:
Gilles Peskine 2018-09-11 15:35:41 +02:00
parent d324c5954a
commit 1da7776bd7
1 changed files with 3 additions and 0 deletions
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3
library/hmac_drbg.c
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@ -93,6 +93,8 @@ void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len ); mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V ); mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
} }
mbedtls_zeroize( K, sizeof( K ) );
} }
/* /*
@ -158,6 +160,7 @@ int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
ctx->reseed_counter = 1; ctx->reseed_counter = 1;
/* 4. Done */ /* 4. Done */
mbedtls_zeroize( seed, seedlen );
return( 0 ); return( 0 );
} }