v0.8.0

The package name has changed to "rustls-ffi" (from "crustls"). The header file (as installed by make DESTDIR=/path/ install) is now rustls.h and the library is librustls.a. The old library and header names are symlinked as part of the install process, to simplify upgrading to the new version.

If you are importing this as a library from other Rust code, you should import rustls_ffi.

New

• rustls_client_config_builder_new_custom and rustls_server_config_builder_new_custom: start building a config, with ciphersuites and TLS versions set at initial construction.
• rustls_default_ciphersuites_get_entry() and rustls_default_ciphersuites_len(): get default ciphersuites as opposed to all ciphersuites (these happen to be the same today but might not always be).

Changed

• rustls-ffi now imports rustls version 0.20, up from rustls 0.19. View the changelog.
• Configuring ciphersuites and TLS versions. Previously these could be set using setter methods on the builder object. Now they have to be set at the beginning of the config builder process, by calling rustls_client_config_builder_new_custom().
• Reading of plaintext from a rustls_connection. When the internal plaintext buffer is empty, rustls_connection_read will return RUSTLS_RESULT_PLAINTEXT_EMPTY. That means no more plaintext can be read until additional TLS bytes are ingested via rustls_connection_read_tls, and rustls_connection_process_new_packets is called. Previously this condition was indicated by returning RUSTLS_RESULT_OK with out_n set to 0.
• Handling of unclean close and the close_notify TLS alert. Mirroring upstream changes, a rustls_connection now tracks TCP closed state like so: rustls_connection_read_tls considers a 0-length read from its callback to mean "TCP stream was closed by peer." If that happens before the peer sent close_notify, rustls_connection_read will return RUSTLS_RESULT_UNEXPECTED_EOF once the available plaintext bytes are exhausted. This is useful to protect against truncation attacks. Note: some TLS implementations don't send close_notify. If you are already getting length information from your protocol (e.g. Content-Length in HTTP) you may choose to ignore UNEXPECTED_EOF so long as the number of plaintext bytes was as expected.
• rustls_version returns a rustls_str that points to a static string in memory, and the function no longer accepts a character buffer or length.
• rustls_error now takes a unsigned int instead of rustls_result directly. This is necessary to avoid undefined behavior if an invalid enum value is passed.
• Some errors starting with RUSTLS_RESULT_CERT_ have been removed, and some renamed.
• rustls_client_config_builder_set_protocols is now rustls_client_config_builder_set_alpn_protocols.
• rustls_server_config_builder_set_protocols is now rustls_server_config_builder_set_alpn_protocols.
• rustls_server_config_builder_with_client_verifier and rustls_server_config_builder_with_client_verifier_optional are replaced by rustls_server_config_builder_set_client_verifier and rustls_server_config_builder_set_client_verifier_optional, which are setters rather than constructors.
• The documented lifetime for pointers returned by rustls_connection_get_peer_certificate and rustls_connection_get_alpn_protocol has been fixed - the pointers those functions provide are valid until the next mutating function call on that connection.

Removed

• rustls_client_config_builder_from_config and rustls_server_config_builder_from_config have been removed. These were incompatible with the changes to config builders. Previously the notion of "config builder" in this library simply meant "A ClientConfig that hasn't yet been wrapped in an Arc," so we could use Clone to get a copy of one. Now "config builder" corresponds to the underlying ConfigBuilder in rustls (plus some rustls-ffi internal state), so we can't use Clone on a ClientConfig to get one. And we can't manually copy fields from a ClientConfig, since some of the necessary fields are private.
• rustls_client_config_builder_set_versions and rustls_client_config_builder_set_ciphersuites are gone - for equivalent functionality, use rustls_client_config_builder_new_custom and rustls_server_config_builder_new_custom.

v0.7.2

• added support for providing client certificates in client connections. [by @djc]

v0.7.1

Prep for 0.7.1. (#126)