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version 1.50, 2018/10/14 15:55:39 version 1.51, 2018/10/14 15:58:57
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 <li>LibreSSL 2.x.x  <li>LibreSSL 2.x.x
    <ul>     <ul>
    <li>     <li> Extensive documentation updates and additional API history.
      <li>Fixed a pair of 20+ year-old bugs in X509_NAME_add_entry
      <li> Tighten up checks for various X509_VERIFY_PARAM functions,
        'poisoning' parameters so that an unverified certificate cannot be
        used if it fails verification.
      <li> Fixed a potential memory leak on failure in ASN1_item_digest
      <li> Fixed a potential memory alignment crash in asn1_item_combine_free
      <li> Removed unused SSL3_FLAGS_DELAY_CLIENT_FINISHED and
        SSL3_FLAGS_POP_BUFFER flags in write path, simplifying IO paths.
      <li> Removed SSL_OP_TLS_ROLLBACK_BUG buggy client workarounds.
      <li> Made ENGINE_finish and ENGINE_free succeed on NULL and simplify callers
        and matching OpenSSL behavior, rewrote ENGINE_* documentation.
      <li> Added const annotations to many existing APIs from OpenSSL, making
        interoperability easier for downstream applications.
      <li> Fixed small timing side-channels in ecdsa_sign_setup and
        dsa_sign_setup.
      <li> Documented security pitfalls with BN_FLG_CONSTTIME and constant-time
        operation of BN_* functions.
      <li> Updated BN_clear to use explicit_bzero.
      <li> Added a missing bounds check in c2i_ASN1_BIT_STRING.
      <li> More CBS conversions, including simplifications to RSA key exchange,
        and converted code to use dedicated buffers for secrets.
      <li> Removed three remaining single DES cipher suites.
      <li>Fixed a potential leak/incorrect return value in DSA signature
        generation.
      <li> Added a blinding value when generating DSA and ECDSA signatures, in
        order to reduce the possibility of a side-channel attack leaking the
        private key.
      <li> Added ECC constant time scalar multiplication support.
        From Billy Brumley and his team at Tampere University of Technology.
      <li> Revised the implementation of RSASSA-PKCS1-v1_5 to match the
        specification in RFC 8017. Based on an OpenSSL commit by David
        Benjamin.
      <li> Cleaned up BN_* implementations following changes made in OpenSSL by
        Davide Galassi and others.
      <li> Added Wycheproof test vectors for ECDH, RSASSA-PSS, AES-GCM,
        AES-CMAC, AES-CCM, AES-CBC-PKCS5, DSA, ChaCha20-Poly1305, ECDSA,
        X25519, and applied appropriate fixes for errors uncovered by tests.
      <li> Simplified key exchange signature generation and verification.
      <li> Fixed a one-byte buffer overrun in callers of EVP_read_pw_string
      <li> Converted more code paths to use CBB/CBS. All handshake messages are
        now created by CBB.
      <li> Fixed various memory leaks found by Coverity.
      <li> Simplfied session ticket parsing and handling, inspired by
        BoringSSL.
      <li> Modified signature of CRYPTO_mem_leaks_* to return -1. This function
        is a no-op in LibreSSL, so this function returns an error to not
        indicate the (non-)existence of memory leaks.
      <li> SSL_copy_session_id, PEM_Sign, EVP_EncodeUpdate, BIO_set_cipher,
        X509_OBJECT_up_ref_count now return an int for error handling,
        matching OpenSSL.
      <li> Converted a number of #defines into proper functions, matching
        OpenSSL's ABI.
      <li> Added X509_get0_serialNumber from OpenSSL.
      <li> Removed EVP_PKEY2PKCS8_broken and PKCS8_set_broken, while adding
        PKCS8_pkey_add1_attr_by_NID and PKCS8_pkey_get0_attrs, matching
        OpenSSL.
      <li> Removed broken pkcs8 formats from openssl(1).
      <li> Converted more functions in public API to use const arguments.
      <li> Stopped handing AES-GCM in ssl_cipher_get_evp, since they use the
        EVP_AEAD interface.
      <li>Stopped using composite EVP_CIPHER AEADs.
      <li> Added timing-safe compares for checking results of signature
        verification. There are no known attacks, this is just inexpensive
        prudence.
      <li> Correctly clear the current cipher state, when changing cipher state.
        This fixed an issue where renegotion of cipher suites would fail
        when switched from AEAD to non-AEAD or vice-versa.
        Issue reported by Bernard Spil.
      <li> Added more cipher tests to appstest.sh, including all TLSv1.2
        ciphers.
      <li> Added RSA_meth_get_finish() RSA_meth_set1_name() from OpenSSL.
      <li> Added new EVP_CIPHER_CTX_(get|set)_iv() API that allows the IV to be
        retrieved and set with appropriate validation.
    </ul>     </ul>
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