Introduce abstraction mbedtls_pk_handle_t
This is the first in a series of commit aimed at removing the pk_info
structures when we're building with MBEDTLS_PK_SINGLE_TYPE enabled.
Introducing this abstraction allows us to later make it a two-valued type
(valid, invalid) instead, which is much lighter.
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 0a1322a..79d5598 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -2383,7 +2383,7 @@
* params currently, and there's no 'is_init' functions for PK
* contexts, we need to break the abstraction and peek into
* the PK context to see if it has been initialized. */
- if( ssl->handshake->peer_pubkey.pk_info != NULL )
+ if( ssl->handshake->peer_pubkey.pk_info != MBEDTLS_PK_INVALID_HANDLE )
peer_pk = &ssl->handshake->peer_pubkey;
#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
if( ssl->session_negotiate->peer_cert != NULL )