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Introduce MD handle type

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As has been previously done for ciphersuites, this commit introduces
a zero-cost abstraction layer around the type

  mbedtls_md_info const *

whose valid values represent implementations of message digest algorithms.

Access to a particular digest implementation can be requested by name or
digest ID through the API mbedtls_md_info_from_xxx(), which either returns
a valid implementation or NULL, representing failure.

This commit replaces such uses of `mbedtls_md_info const *` by an abstract
type `mbedtls_md_handle_t` whose valid values represent digest implementations,
and which has a designated invalid value MBEDTLS_MD_INVALID_HANDLE.

The purpose of this abstraction layer is to pave the way for builds which
support precisely one digest algorithm. In this case, mbedtls_md_handle_t
can be implemented as a two-valued type, with one value representing the
invalid handle, and the unique valid value representing the unique enabled
digest.
This commit is contained in:
Hanno Becker 2019-07-17 11:21:02 +01:00
parent 505be8be4d
commit a5cedbcd3f
30 changed files with 247 additions and 177 deletions
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7
library/ecdsa.c
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@ -412,11 +412,14 @@ static int ecdsa_sign_det_restartable( mbedtls_ecp_group *grp,
mbedtls_hmac_drbg_context *p_rng = &rng_ctx;
unsigned char data[2 * MBEDTLS_ECP_MAX_BYTES];
size_t grp_len = ( grp->nbits + 7 ) / 8;
const mbedtls_md_info_t *md_info;
mbedtls_md_handle_t md_info;
mbedtls_mpi h;
if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) ==
MBEDTLS_MD_INVALID_HANDLE )
{
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
}
mbedtls_mpi_init( &h );
mbedtls_hmac_drbg_init( &rng_ctx );