Changes since previous version:
+ Added general-purpose implementations of EAX and CCM modes (including
shared precomputation support for EAX).
+ Added general-purpose RSA/OAEP implementation.
+ Added general-purpose HKDF implementation.
+ Added support for CCM and CCM_8 TLS cipher suites (RFC 6655 and RFC 7251).
+ Added RSA and EC key generation.
+ Added private key encoding support ("raw" and PKCS#8 formats, both
in DER and PEM, for RSA and EC key pairs).
+ Made Base64 encoding/decoding constant-time (with regards to the
encoded data bytes).
+ Added a generic API for random seed providers.
+ Added an extra DRBG based on AES/CTR + Hirose construction for reseeding.
+ Some cosmetic fixes to avoid warnings with picky compilers.
+ Makefile fix to achieve compatibility with OpenBSD.
+ Fixed a bug in bit length computation for big integers (this was
breaking RSA signatures with some specific implementations and key lengths).
+ Made SSL/TLS client stricter in cipher suite selection (to align with
server behaviour).
Added support for the BoarSSL / Twrch test framework.
Header files now include the ritual mantras that make them compatible with C++.
Better Makefile behaviour with Clang (FreeBSD compatibility).
Worked around a bug of GCC 4.8 and 4.9 in 32-bit x86 mode.
Incoming application data after initiating closure is now properly ignored.
Some instances of (critical) Certificate Policies extensions are now ignored (when it is safe to do so).
Fixed some behavioural bugs with regards to renegotiation (all were failing safe).
Added encoded OID for hash functions in the public API, to help with using RSA signatures in non-SSL contexts.
Fixed bug in AES/CBC decryption on x86 with AES-NI opcode (this was breaking decryption with AES/CBC cipher suites and TLS 1.0 only).
Added an explicit stack buffer initialisation (some provably harmless accesses to uninitialised data were performed, Valgrind was not happy).
Fixed bug in the search tree for the cache of SSL sessions (occasional lock-ups).
Fixed bug in modular reduction in the special field for P-256 (this was infrequently breaking ECDSA signatures).
Added support for exporting keying material (RFC 5705).
Added new general-purpose API for AEAD implementations (in non-SSL contexts) and an AES/GCM implementation that follows that API.
Added a function to forget saved session parameter in the LRU cache.
Added a new ChaCha20 implementation that uses SSE2 on x86 architectures (both 32-bit and 64-bit).
BearSSL is an implementation of the SSL/TLS protocol (RFC 5246)
written in C. It aims at offering the following features:
* Be correct and secure. In particular, insecure protocol versions
and choices of algorithms are not supported, by design;
cryptographic algorithm implementations are constant-time by
default.
* Be small, both in RAM and code footprint. For instance, a minimal
server implementation may fit in about 20 kilobytes of compiled
code and 25 kilobytes of RAM.
* Be highly portable. BearSSL targets not only "big" operating
systems like Linux and Windows, but also small embedded systems
and even special contexts like bootstrap code.
* Be feature-rich and extensible. SSL/TLS has many defined cipher
suites and extensions; BearSSL should implement most of them,
and allow extra algorithm implementations to be added afterwards,
possibly from third parties.
bearssl is considered alpha-quality software, which means that it
runs but it probably has bugs, some of which being certainly
exploitable vulnerabilities.
