GnuTLS NEWS -- History of user-visible changes.                -*- outline -*-
Bug numbers referenced in this log correspond to bug numbers at our issue tracker,
available at https://gitlab.com/gnutls/gnutls/issues
Copyright (C) 2000-2016 Free Software Foundation, Inc.
Copyright (C) 2013-2019 Nikos Mavrogiannopoulos
See the end for copying conditions.

* Version 3.6.16 (released 2021-05-24)

** libgnutls: Fixed potential miscalculation of ECDSA/EdDSA code backported from
   Nettle.  In GnuTLS, as long as it is built and linked against the fixed
   version of Nettle, this only affects GOST curves.  [CVE-2021-20305]

** libgnutls: Fixed potential use-after-free in sending "key_share"
   and "pre_shared_key" extensions. When sending those extensions, the
   client may dereference a pointer no longer valid after
   realloc. This happens only when the client sends a large Client
   Hello message, e.g., when HRR is sent in a resumed session
   previously negotiated large FFDHE parameters, because the initial
   allocation of the buffer is large enough without having to call
   realloc (#1151).  [GNUTLS-SA-2021-03-10, CVSS: low]

** API and ABI modifications:
No changes since last version.

* Version 3.6.15 (released 2020-09-04)

** libgnutls: Fixed "no_renegotiation" alert handling at incorrect timing.
   The server sending a "no_renegotiation" alert in an unexpected timing,
   followed by an invalid second handshake was able to cause a TLS 1.3 client to
   crash via a null-pointer dereference. The crash happens in the application's
   error handling path, where the gnutls_deinit function is called after
   detecting a handshake failure (#1071).  [GNUTLS-SA-2020-09-04, CVSS: medium]

** libgnutls: If FIPS self-tests are failed, gnutls_fips140_mode_enabled() now
   indicates that with a false return value (!1306).

** libgnutls: Under FIPS mode, the generated ECDH/DH public keys are checked
   accordingly to SP800-56A rev 3 (!1295, !1299).

** libgnutls: gnutls_x509_crt_export2() now returns 0 upon success, rather than
   the size of the internal base64 blob (#1025). The new behavior aligns to the
   existing documentation.

** libgnutls: Certificate verification failue due to OCSP must-stapling is not
   honered is now correctly marked with the GNUTLS_CERT_INVALID flag
   (!1317). The new behavior aligns to the existing documentation.

** libgnutls: The audit log message for weak hashes is no longer printed twice
   (!1301).

** libgnutls: Fixed version negotiation when TLS 1.3 is enabled and TLS 1.2 is
   disabled in the priority string. Previously, even when TLS 1.2 is explicitly
   disabled with "-VERS-TLS1.2", the server still offered TLS 1.2 if TLS 1.3 is
   enabled (#1054).

** API and ABI modifications:
No changes since last version.

* Version 3.6.14 (released 2020-06-03)

** libgnutls: Fixed insecure session ticket key construction, since 3.6.4.
   The TLS server would not bind the session ticket encryption key with a
   value supplied by the application until the initial key rotation, allowing
   attacker to bypass authentication in TLS 1.3 and recover previous
   conversations in TLS 1.2 (#1011).
   [GNUTLS-SA-2020-06-03, CVSS: high]

** libgnutls: Fixed handling of certificate chain with cross-signed
   intermediate CA certificates (#1008).

** libgnutls: Fixed reception of empty session ticket under TLS 1.2 (#997).

** libgnutls: gnutls_x509_crt_print() is enhanced to recognizes commonName
   (2.5.4.3), decodes certificate policy OIDs (!1245), and prints Authority
   Key Identifier (AKI) properly (#989, #991).

** certtool: PKCS #7 attributes are now printed with symbolic names (!1246).

** libgnutls: Added several improvements on Windows Vista and later releases
   (!1257, !1254, !1256). Most notably the system random number generator now
   uses Windows BCrypt* API if available (!1255).

** libgnutls: Use accelerated AES-XTS implementation if possible (!1244).
   Also both accelerated and non-accelerated implementations check key block
   according to FIPS-140-2 IG A.9 (!1233).

** libgnutls: Added support for AES-SIV ciphers (#463).

** libgnutls: Added support for 192-bit AES-GCM cipher (!1267).

** libgnutls: No longer use internal symbols exported from Nettle (!1235)

** API and ABI modifications:
GNUTLS_CIPHER_AES_128_SIV: Added
GNUTLS_CIPHER_AES_256_SIV: Added
GNUTLS_CIPHER_AES_192_GCM: Added
gnutls_pkcs7_print_signature_info: Added

* Version 3.6.13 (released 2020-03-31)

** libgnutls: Fix a DTLS-protocol regression (caused by TLS1.3 support), since 3.6.3.
   The DTLS client would not contribute any randomness to the DTLS negotiation,
   breaking the security guarantees of the DTLS protocol (#960)
   [GNUTLS-SA-2020-03-31, CVSS: high]

** libgnutls: Added new APIs to access KDF algorithms (#813).

** libgnutls: Added new callback gnutls_keylog_func that enables a custom
   logging functionality.

** libgnutls: Added support for non-null terminated usernames in PSK
   negotiation (#586).

** gnutls-cli-debug: Improved support for old servers that only support
   SSL 3.0.

** API and ABI modifications:
gnutls_hkdf_extract: Added
gnutls_hkdf_expand: Added
gnutls_pbkdf2: Added
gnutls_session_get_keylog_function: Added
gnutls_session_set_keylog_function: Added
gnutls_prf_hash_get: Added
gnutls_psk_server_get_username2: Added
gnutls_psk_set_client_credentials2: Added
gnutls_psk_set_client_credentials_function2: Added
gnutls_psk_set_server_credentials_function2: Added


* Version 3.6.12 (released 2020-02-01)

** libgnutls: Introduced TLS session flag (gnutls_session_get_flags())
   to identify sessions that client request OCSP status request (#829).

** libgnutls: Added support for X448 key exchange (RFC 7748) and Ed448
   signature algorithm (RFC 8032) under TLS (#86).

** libgnutls: Added the default-priority-string option to system configuration;
   it allows overriding the compiled-in default-priority-string.

** libgnutls: Added support for GOST CNT_IMIT ciphersuite (as defined by
   draft-smyshlyaev-tls12-gost-suites-07).
   By default this ciphersuite is disabled. It can be enabled by adding
   +GOST to priority string. In the future this priority string may enable
   other GOST ciphersuites as well.  Note, that server will fail to negotiate
   GOST ciphersuites if TLS 1.3 is enabled both on a server and a client. It
   is recommended for now to disable TLS 1.3 in setups where GOST ciphersuites
   are enabled on GnuTLS-based servers.

** libgnutls: added priority shortcuts for different GOST categories like
   CIPHER-GOST-ALL, MAC-GOST-ALL, KX-GOST-ALL, SIGN-GOST-ALL, GROUP-GOST-ALL.

** libgnutls: Reject certificates with invalid time fields. That is we reject
   certificates with invalid characters in Time fields, or invalid time formatting
   To continue accepting the invalid form compile with --disable-strict-der-time
   (#207, #870).

** libgnutls: Reject certificates which contain duplicate extensions. We were
   previously printing warnings when printing such a certificate, but that is
   not always sufficient to flag such certificates as invalid. Instead we now
   refuse to import them (#887).

** libgnutls: If a CA is found in the trusted list, check in addition to
   time validity, whether the algorithms comply to the expected level prior
   to accepting it. This addresses the problem of accepting CAs which would
   have been marked as insecure otherwise (#877).

** libgnutls: The min-verification-profile from system configuration applies
   for all certificate verifications, not only under TLS. The configuration can
   be overriden using the GNUTLS_SYSTEM_PRIORITY_FILE environment variable.

** libgnutls: The stapled OCSP certificate verification adheres to the convention
   used throughout the library of setting the 'GNUTLS_CERT_INVALID' flag.

** libgnutls: On client side only send OCSP staples if they have been requested
   by the server, and on server side always advertise that we support OCSP stapling
   (#876).

** libgnutls: Introduced the gnutls_ocsp_req_const_t which is compatible
   with gnutls_ocsp_req_t but const.

** certtool: Added the --verify-profile option to set a certificate
   verification profile. Use '--verify-profile low' for certificate verification
   to apply the 'NORMAL' verification profile.

** certtool: The add_extension template option is considered even when generating
   a certificate from a certificate request.

** API and ABI modifications:
GNUTLS_SFLAGS_CLI_REQUESTED_OCSP: Added
GNUTLS_SFLAGS_SERV_REQUESTED_OCSP: Added
gnutls_ocsp_req_const_t: Added


* Version 3.6.11 (released 2019-12-01)

** libgnutls: Use KERN_ARND for the system random number generator on NetBSD.
   This syscall provides an endless stream of random numbers from the kernel's
   ChaCha20-based random number generator, without blocking or requiring an open file
   descriptor.

** libgnutls: Corrected issue with TLS 1.2 session ticket handling as client
   during resumption (#841).

** libgnutls: gnutls_base64_decode2() succeeds decoding the empty string to
   the empty string. This is a behavioral change of the API but it conforms
   to the RFC4648 expectations (#834).

** libgnutls: Fixed AES-CFB8 implementation, when input is shorter than
   the block size. Fix backported from nettle.

** certtool: CRL distribution points will be set in CA certificates even when
   non self-signed (#765).

** gnutls-cli/serv: added raw public-key handling capabilities (RFC7250).
   Key material can be set via the --rawpkkeyfile and --rawpkfile flags.

** API and ABI modifications:
No changes since last version.


* Version 3.6.10 (released 2019-09-29)

** libgnutls: Added support for deterministic ECDSA/DSA (RFC6979)
   Deterministic signing can be enabled by setting
   GNUTLS_PRIVKEY_FLAG_REPRODUCIBLE when calling gnutls_privkey_sign_*()
   functions (#94).

** libgnutls: add gnutls_aead_cipher_encryptv2 and gnutls_aead_cipher_decryptv2
   functions that will perform in-place encryption/decryption on data buffers (#718).

** libgnutls: Corrected issue in gnutls_session_get_data2() which could fail under
   TLS1.3, if a timeout callback was not set using gnutls_transport_set_pull_timeout_function()
   (#823).

** libgnutls: added interoperability tests with gnutls 2.12.x; addressed
   issue with large record handling due to random padding (#811).

** libgnutls: the server now selects the highest TLS protocol version,
   if TLS 1.3 is enabled and the client advertises an older protocol version first (#837).

** libgnutls: fix non-PIC assembly on i386 (#818).

** libgnutls: added support for GOST 28147-89 cipher in CNT (GOST counter) mode
   and MAC generation based on GOST 28147-89 (IMIT). For description of the
   modes see RFC 5830. S-Box is id-tc26-gost-28147-param-Z (TC26Z) defined in
   RFC 7836.

** certtool: when outputting an encrypted private key do not insert the textual description
   of it. This fixes a regression since 3.6.5 (#840).

** API and ABI modifications:
gnutls_aead_cipher_encryptv2: Added
gnutls_aead_cipher_decryptv2: Added
GNUTLS_CIPHER_GOST28147_TC26Z_CNT: Added
GNUTLS_MAC_GOST28147_TC26Z_IMIT: Added

* Version 3.6.9 (released 2019-07-25)

** libgnutls: add gnutls_hash_copy/gnutls_hmac_copy functions that will create a copy
   of digest or MAC context. Copying contexts for externally-registered digest and MAC
   contexts is unupported (#787).

** Marked the crypto implementation override APIs as deprecated. These APIs are rarely
   used, are for a niche use case, but have significant side effects, such as preventing
   any internal re-organization and extension of the internal cipher API. The APIs remain
   functional though a compiler warning will be issued, and a future minor version update
   may transform them to a no-op while keeping ABI compatibility (#789).

** libgnutls: Added support for AES-GMAC, as a separate to GCM, MAC algorithm (#781).

** libgnutls: gnutls_privkey_sign_hash2 now accepts the GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA
   flag as documented. This makes it a complete replacement of gnutls_privkey_sign_hash().

** libgnutls: Added support for Generalname registeredID.

** The priority configuration was enhanced to allow more elaborate
   system-wide configuration of the library (#587).
   The following changes were included:
    - The file is read as an ini file with '#' indicating a comment.
    - The section "[priorities]" or global follows the existing semantics of
      the configuration file, and allows to specify system-wide priority strings
      which are accessed with the '@' prefix.
    - The section "[overrides]" is added with the parameters "insecure-hash",
      "insecure-sig", "insecure-sig-for-cert", "disabled-curve",
      "disabled-version", "min-verification-profile", "tls-disabled-cipher",
      "tls-disabled-mac", "tls-disabled-group", "tls-disabled-kx", which prohibit
      specific algorithms or options globally. Existing algorithms in the
      library can be marked as disabled and insecure, but no hard-coded
      insecure algorithm can be marked as secure (so that the configuration
      cannot be abused to make the system vulnerable).
    - Unknown sections or options are skipped with a debug message, unless
      the GNUTLS_SYSTEM_PRIORITY_FAIL_ON_INVALID environment parameter is
      set to 1.

** libgnutls: Added new flag for GNUTLS_CPUID_OVERRIDE
    - 0x20: Enable SHA_NI instruction set

** API and ABI modifications:
gnutls_crypto_register_cipher: Deprecated
gnutls_crypto_register_aead_cipher: Deprecated
gnutls_crypto_register_digest: Deprecated
gnutls_crypto_register_mac: Deprecated
gnutls_get_system_config_file: Added
gnutls_hash_copy: Added
gnutls_hmac_copy: Added
GNUTLS_MAC_AES_GMAC_128: Added
GNUTLS_MAC_AES_GMAC_192: Added
GNUTLS_MAC_AES_CMAC_256: Added
GNUTLS_SAN_REGISTERED_ID: Added


* Version 3.6.8 (released 2019-05-28)

** libgnutls: Added gnutls_prf_early() function to retrieve early keying
   material (#329)

** libgnutls: Added support for AES-XTS cipher (#354)

** libgnutls: Fix calculation of Streebog digests (incorrect carry operation in
   512 bit addition)

** libgnutls: During Diffie-Hellman operations in TLS, verify that the peer's
   public key is on the right subgroup (y^q=1 mod p), when q is available (under
   TLS 1.3 and under earlier versions when RFC7919 parameters are used).

** libgnutls: the gnutls_srp_set_server_credentials_function can now be used
   with the 8192 parameters as well (#995).

** libgnutls: Fixed bug preventing the use of gnutls_pubkey_verify_data2() and
   gnutls_pubkey_verify_hash2() with the GNUTLS_VERIFY_DISABLE_CA_SIGN flag (#754)

** libgnutls: The priority string option %ALLOW_SMALL_RECORDS was added to allow
   clients to communicate with the server advertising smaller limits than 512

** libgnutls: Apply STD3 ASCII rules in gnutls_idna_map() to prevent
   hostname/domain crafting via IDNA conversion (#720)

** certtool: allow the digital signature key usage flag in CA certificates.
   Previously certtool would ignore this flag for CA certificates even if
   specified (#767)

** gnutls-cli/serv: added the --keymatexport and --keymatexportsize options.
   These allow testing the RFC5705 using these tools.

** API and ABI modifications:
gnutls_prf_early: Added
gnutls_record_set_max_recv_size: Added
gnutls_dh_params_import_raw3: Added
gnutls_ffdhe_2048_group_q: Added
gnutls_ffdhe_3072_group_q: Added
gnutls_ffdhe_4096_group_q: Added
gnutls_ffdhe_6144_group_q: Added
gnutls_ffdhe_8192_group_q: Added


* Version 3.6.7 (released 2019-03-27)

** libgnutls, gnutls tools: Every gnutls_free() will automatically set
   the free'd pointer to NULL. This prevents possible use-after-free and
   double free issues. Use-after-free will be turned into NULL dereference.
   The counter-measure does not extend to applications using gnutls_free().

** libgnutls: Fixed a memory corruption (double free) vulnerability in the
   certificate verification API. Reported by Tavis Ormandy; addressed with
   the change above. [GNUTLS-SA-2019-03-27, #694]

** libgnutls: Fixed an invalid pointer access via malformed TLS1.3 async messages;
   Found using tlsfuzzer. [GNUTLS-SA-2019-03-27, #704]

** libgnutls: enforce key usage limitations on certificates more actively.
   Previously we would enforce it for TLS1.2 protocol, now we enforce it
   even when TLS1.3 is negotiated, or on client certificates as well. When
   an inappropriate for TLS1.3 certificate is seen on the credentials structure
   GnuTLS will disable TLS1.3 support for that session (#690).

** libgnutls: the default number of tickets sent under TLS 1.3 was increased to
   two. This makes it easier for clients which perform multiple connections
   to the server to use the tickets sent by a default server.

** libgnutls: enforce the equality of the two signature parameters fields in
   a certificate. We were already enforcing the signature algorithm, but there
   was a bug in parameter checking code.

** libgnutls: fixed issue preventing sending and receiving from different
   threads when false start was enabled (#713).

** libgnutls: the flag GNUTLS_PKCS11_OBJ_FLAG_LOGIN_SO now implies a writable
   session, as non-writeable security officer sessions are undefined in PKCS#11
   (#721).

** libgnutls: no longer send downgrade sentinel in TLS 1.3.
   Previously the sentinel value was embedded to early in version
   negotiation and was sent even on TLS 1.3. It is now sent only when
   TLS 1.2 or earlier is negotiated (#689).

** gnutls-cli: Added option --logfile to redirect informational messages output.

** API and ABI modifications:
No changes since last version.


* Version 3.6.6 (released 2019-01-25)

** libgnutls: gnutls_pubkey_import_ecc_raw() was fixed to set the number bits
   on the public key (#640).

** libgnutls: Added support for raw public-key authentication as defined in RFC7250.
   Raw public-keys can be negotiated by enabling the corresponding certificate
   types via the priority strings. The raw public-key mechanism must be explicitly
   enabled via the GNUTLS_ENABLE_RAWPK init flag (#26, #280).

** libgnutls: When on server or client side we are sending no extensions we do
   not set an empty extensions field but we rather remove that field competely.
   This solves a regression since 3.5.x and improves compatibility of the server
   side with certain clients.

** libgnutls: We no longer mark RSA keys in PKCS#11 tokens as RSA-PSS capable if
   the CKA_SIGN is not set (#667).

** libgnutls: The priority string option %NO_EXTENSIONS was improved to completely
   disable extensions at all cases, while providing a functional session. This
   also implies that when specified, TLS1.3 is disabled.

** libgnutls: GNUTLS_X509_NO_WELL_DEFINED_EXPIRATION was marked as deprecated.
   The previous definition was non-functional (#609).

** API and ABI modifications:
GNUTLS_ENABLE_RAWPK: Added
GNUTLS_ENABLE_CERT_TYPE_NEG: Removed (was no-op; replaced by GNUTLS_ENABLE_RAWPK) 
GNUTLS_X509_NO_WELL_DEFINED_EXPIRATION: Deprecated
GNUTLS_PCERT_NO_CERT: Deprecated


* Version 3.6.5 (released 2018-12-01)

** libgnutls: Provide the option of transparent re-handshake/reauthentication
   when the GNUTLS_AUTO_REAUTH flag is specified in gnutls_init() (#571).

** libgnutls: Added support for TLS 1.3 zero round-trip (0-RTT) mode (#127)

** libgnutls: The priority functions will ignore and not enable TLS1.3 if
   requested with legacy TLS versions enabled but not TLS1.2. That is because
   if such a priority string is used in the client side (e.g., TLS1.3+TLS1.0 enabled)
   servers which do not support TLS1.3 will negotiate TLS1.2 which will be
   rejected by the client as disabled (#621).

** libgnutls: Change RSA decryption to use a new side-channel silent function.
   This addresses a security issue where memory access patterns as well as timing
   on the underlying Nettle rsa-decrypt function could lead to new Bleichenbacher
   attacks. Side-channel resistant code is slower due to the need to mask
   access and timings. When used in TLS the new functions cause RSA based
   handshakes to be between 13% and 28% slower on average (Numbers are indicative,
   the tests where performed on a relatively modern Intel CPU, results vary
   depending on the CPU and architecture used). This change makes nettle 3.4.1
   the minimum requirement of gnutls (#630). [CVSS: medium]

** libgnutls: gnutls_priority_init() and friends, allow the CTYPE-OPENPGP keyword
   in the priority string. It is only accepted as legacy option and is ignored.

** libgnutls: Added support for EdDSA under PKCS#11 (#417)

** libgnutls: Added support for AES-CFB8 cipher (#357)

** libgnutls: Added support for AES-CMAC MAC (#351)

** libgnutls: In two previous versions GNUTLS_CIPHER_GOST28147_CPB/CPC/CPD_CFB ciphers
   have incorrectly used CryptoPro-A S-BOX instead of proper (CryptoPro-B/-C/-D
   S-BOXes). They are fixed now.

** libgnutls: Added support for GOST key unmasking and unwrapped GOST private
   keys parsing, as specified in R 50.1.112-2016.

** gnutls-serv: It applies the default settings when no --priority option is given,
   using gnutls_set_default_priority().

** p11tool: Fix initialization of security officer's PIN with the --initialize-so-pin
   option (#561)

** certtool: Add parameter --no-text that prevents certtool from outputting
   text before PEM-encoded private key, public key, certificate, CRL or CSR.

** API and ABI modifications:
GNUTLS_AUTO_REAUTH: Added
GNUTLS_CIPHER_AES_128_CFB8: Added
GNUTLS_CIPHER_AES_192_CFB8: Added
GNUTLS_CIPHER_AES_256_CFB8: Added
GNUTLS_MAC_AES_CMAC_128: Added
GNUTLS_MAC_AES_CMAC_256: Added
gnutls_record_get_max_early_data_size: Added
gnutls_record_send_early_data: Added
gnutls_record_recv_early_data: Added
gnutls_db_check_entry_expire_time: Added
gnutls_anti_replay_set_add_function: Added
gnutls_anti_replay_init: Added
gnutls_anti_replay_deinit: Added
gnutls_anti_replay_set_window: Added
gnutls_anti_replay_enable: Added
gnutls_privkey_decrypt_data2: Added


* Version 3.6.4 (released 2018-09-24)

** libgnutls: Added the final (RFC8446) version numbering of the TLS1.3 protocol.

** libgnutls: Corrected regression since 3.6.3 in the callbacks set with
   gnutls_certificate_set_retrieve_function() which could not handle the case where
   no certificates were returned, or the callbacks were set to NULL (see #528).

** libgnutls: gnutls_handshake() on server returns early on handshake when no
   certificate is presented by client and the gnutls_init() flag GNUTLS_ENABLE_EARLY_START
   is specified.

** libgnutls: Added session ticket key rotation on server side with TOTP.
   The key set with gnutls_session_ticket_enable_server() is used as a
   master key to generate time-based keys for tickets. The rotation
   relates to the gnutls_db_set_cache_expiration() period.

** libgnutls: The 'record size limit' extension is added and preferred to the
   'max record size' extension when possible.

** libgnutls: Provide a more flexible PKCS#11 search of trust store certificates.
   This addresses the problem where the CA certificate doesn't have a subject key
   identifier whereas the end certificates have an authority key identifier (#569)

** libgnutls: gnutls_privkey_export_gost_raw2(), gnutls_privkey_import_gost_raw(),
   gnutls_pubkey_export_gost_raw2(), gnutls_pubkey_import_gost_raw() import
   and export GOST parameters in the "native" little endian format used for these
   curves. This is an intentional incompatible change with 3.6.3.

** libgnutls: Added support for seperately negotiating client and server certificate types
   as defined in RFC7250. This mechanism must be explicitly enabled via the
   GNUTLS_ENABLE_CERT_TYPE_NEG flag in gnutls_init().

** gnutls-cli: enable CRL validation on startup (#564)

** API and ABI modifications:
GNUTLS_ENABLE_EARLY_START: Added
GNUTLS_ENABLE_CERT_TYPE_NEG: Added
GNUTLS_TL_FAIL_ON_INVALID_CRL: Added
GNUTLS_CERTIFICATE_VERIFY_CRLS: Added
gnutls_ctype_target_t: New enumeration
gnutls_record_set_max_early_data_size: Added
gnutls_certificate_type_get2: Added
gnutls_priority_certificate_type_list2: Added
gnutls_ffdhe_6144_group_prime: Added
gnutls_ffdhe_6144_group_generator: Added
gnutls_ffdhe_6144_key_bits: Added


* Version 3.6.3 (released 2018-07-16)

** libgnutls: Introduced support for draft-ietf-tls-tls13-28. It includes version
   negotiation, post handshake authentication, length hiding, multiple OCSP support,
   consistent ciphersuite support across protocols, hello retry requests, ability
   to adjust key shares via gnutls_init() flags, certificate authorities extension,
   and key usage limits. TLS1.3 draft-28 support can be enabled by default if
   the option --enable-tls13-support is given to configure script.

** libgnutls: Apply compatibility settings for existing applications running with TLS1.2 or
   earlier and TLS 1.3. When SRP or NULL ciphersuites are specified in priority strings
   TLS 1.3 is will be disabled. When Anonymous ciphersuites are specified in priority
   strings, then TLS 1.3 negotiation will be disabled if the session is associated
   only with an anonymous credentials structure.

** Added support for Russian Public Key Infrastructure according to RFCs 4491/4357/7836.
   This adds support for using GOST keys for digital signatures and under PKCS#7, PKCS#12,
   and PKCS#8 standards. In particular added elliptic curves GOST R 34.10-2001 CryptoProA
   256-bit curve (RFC 4357), GOST R 34.10-2001 CryptoProXchA 256-bit curve (RFC 4357),
   and GOST R 34.10-2012 TC26-512-A 512-bit curve (RFC 7836).

** Provide a uniform cipher list across supported TLS protocols; the CAMELLIA ciphers
   as well as ciphers utilizing HMAC-SHA384 and SHA256 have been removed from the default
   priority strings, as they are undefined under TLS1.3 and they provide no advantage
   over other options in earlier protocols.

** The SSL 3.0 protocol is disabled on compile-time by default. It can be re-enabled
   by specifying --enable-ssl3-support on configure script.

** libgnutls: Introduced function to switch the current FIPS140-2 operational
   mode, i.e., strict vs a more lax mode which will allow certain non FIPS140-2
   operations.

** libgnutls: Introduced low-level function to assist applications attempting client
   hello extension parsing, prior to GnuTLS' parsing of the message.

** libgnutls: When exporting an X.509 certificate avoid re-encoding if there are no
   modifications to the certificate. That prevents DER re-encoding issues with incorrectly
   encoded certificates, or other DER incompatibilities to affect a TLS session.
   Relates with #403

** libgnutls: on group exchange honor the %SERVER_PRECEDENCE and select the groups
   which are preferred by the server. That unfortunately has complicated semantics
   as TLS1.2 requires specific ordering of the groups based on the ciphersuite ordering,
   which could make group order unpredictable if TLS1.3 is negotiated.

** Improved counter-measures for TLS CBC record padding. Kenny Paterson, Eyal Ronen
   and Adi Shamir reported that the existing counter-measures had certain issues and
   were insufficient when the attacker has additional access to the CPU cache and
   performs a chosen-plaintext attack. This affected the legacy CBC ciphersuites. [CVSS: medium]

** Introduced the %FORCE_ETM priority string option. This option prevents the negotiation
   of legacy CBC ciphersuites unless encrypt-then-mac is negotiated.

** libgnutls: gnutls_privkey_import_ext4() was enhanced with the
   GNUTLS_PRIVKEY_INFO_PK_ALGO_BITS flag.

** libgnutls: gnutls_pkcs11_copy_secret_key, gnutls_pkcs11_copy_x509_privkey2,
   gnutls_pkcs11_privkey_generate3 will mark objects as sensitive by default
   unless GNUTLS_PKCS11_OBJ_FLAG_MARK_NOT_SENSITIVE is specified. This is an API
   change for these functions which make them err towards safety.

** libgnutls: improved aarch64 cpu features detection by using getauxval().

** certtool: It is now possible to specify certificate and serial CRL numbers greater
   than 2**63-2 as a hex-encoded string both when prompted and in a template file.
   Default certificate serial numbers are now fully random. Default CRL
   numbers include more random bits and are larger than in previous GnuTLS versions.
   Since CRL numbers are required to be monotonic, specify suitable CRL numbers manually
   if you intend to later downgrade to previous versions as it was not possible
   to specify large CRL numbers in previous versions of certtool.

** API and ABI modifications:
gnutls_fips140_set_mode: Added
gnutls_session_key_update: Added
gnutls_ext_get_current_msg: Added
gnutls_reauth: Added
gnutls_ocsp_status_request_get2: Added
gnutls_ocsp_resp_import2: Added
gnutls_ocsp_resp_export2: Added
gnutls_ocsp_resp_list_import2: Added
gnutls_certificate_set_retrieve_function3: Added
gnutls_certificate_set_ocsp_status_request_file2: Added
gnutls_certificate_set_ocsp_status_request_mem: Added
gnutls_certificate_get_ocsp_expiration: Added
gnutls_record_send2: Added
gnutls_ext_raw_parse: Added
gnutls_x509_crt_list_import_url: Added
gnutls_pcert_list_import_x509_file: Added
gnutls_pkcs11_token_get_ptr: Added
gnutls_pkcs11_obj_get_ptr: Added
gnutls_session_ticket_send: Added
gnutls_aead_cipher_encryptv: Added
gnutls_gost_paramset_get_name: Added
gnutls_gost_paramset_get_oid: Added
gnutls_oid_to_gost_paramset: Added
gnutls_decode_gost_rs_value: Added
gnutls_encode_gost_rs_value: Added
gnutls_pubkey_export_gost_raw2: Added
gnutls_pubkey_import_gost_raw: Added
gnutls_x509_crt_get_pk_gost_raw: Added
gnutls_privkey_export_gost_raw2: Added
gnutls_privkey_import_gost_raw: Added
gnutls_x509_privkey_export_gost_raw: Added
gnutls_x509_privkey_import_gost_raw: Added
gnutls_set_default_priority_append: Added
gnutls_priority_init2: Added
GNUTLS_PRIVKEY_INFO_PK_ALGO_BITS: Added
GNUTLS_PKCS11_OBJ_FLAG_MARK_NOT_SENSITIVE: Added


* Version 3.6.2 (released 2018-02-16)

** libgnutls: When verifying against a self signed certificate ignore issuer.
   That is, ignore issuer when checking the issuer's parameters strength, resolving
   issue #347 which caused self signed certificates to be additionally marked as of
   insufficient security level.

** libgnutls: Corrected MTU calculation for the CBC ciphersuites. The data
   MTU calculation now, it correctly accounts for the fixed overhead due to
   padding (as 1 byte), while at the same time considers the rest of the
   padding as part of data MTU.

** libgnutls: Address issue of loading of all PKCS#11 modules on startup
   on systems with a PKCS#11 trust store (as opposed to a file trust store).
   Introduced a multi-stage initialization which loads the trust modules, and
   other modules are deferred for the first pure PKCS#11 request.

** libgnutls: The SRP authentication will reject any parameters outside
   RFC5054. This protects any client from potential MitM due to insecure
   parameters. That also brings SRP in par with the RFC7919 changes to
   Diffie-Hellman.

** libgnutls: Added the 8192-bit parameters of SRP to the accepted parameters
   for SRP authentication.

** libgnutls: Addressed issue in the accelerated code affecting interoperability
   with versions of nettle >= 3.4.

** libgnutls: Addressed issue in the AES-GCM acceleration under aarch64.

** libgnutls: Addressed issue in the AES-CBC acceleration under ssse3 (patch by
   Vitezslav Cizek).

** srptool: the --create-conf option no longer includes 1024-bit parameters.

** p11tool: Fixed the deletion of objects in batch mode.

** API and ABI modifications:
gnutls_srp_8192_group_generator: Added
gnutls_srp_8192_group_prime: Added


* Version 3.6.1 (released 2017-10-21)

** libgnutls: Fixed interoperability issue with openssl when safe renegotiation was
   used. Resolves gitlab issue #259.

** libgnutls: gnutls_x509_crl_sign, gnutls_x509_crt_sign,
   gnutls_x509_crq_sign, were modified to sign with a better algorithm than
   SHA1. They will now sign with an algorithm that corresponds to the security
   level of the signer's key.

** libgnutls: gnutls_x509_*_sign2() functions and gnutls_x509_*_privkey_sign()
   accept GNUTLS_DIG_UNKNOWN (0) as a hash function option. That will signal
   the function to auto-detect an appropriate hash algorithm to use.

** libgnutls: Removed support for signature algorithms using SHA2-224 in TLS.
   TLS 1.3 no longer uses SHA2-224 and it was never a widespread algorithm
   in TLS 1.2. As such, no reason to keep supporting it.

** libgnutls: Refuse to use client certificates containing disallowed
   algorithms for a session. That reverts a change on 3.5.5, which allowed
   a client to use DSA-SHA1 due to his old DSA certificate, without requiring him
   to enable DSA-SHA1 (and thus make it acceptable for the server's certificate).
   The previous approach was to allow a smooth move for client infrastructure
   after the DSA algorithm became disabled by default, and is no longer necessary
   as DSA is now being universally depracated.

** libgnutls: Refuse to resume a session which had a different SNI advertised. That
   improves RFC6066 support in server side. Reported by Thomas Klute.

** p11tool: Mark all generated objects as sensitive by default.

** p11tool: added options --sign-params and --hash. This allows testing
   signature with multiple algorithms, including RSA-PSS.

** API and ABI modifications:
No changes since last version.


* Version 3.6.0 (released 2017-08-21)

** libgnutls: tlsfuzzer is part of the CI testsuite. This is a TLS testing and
   fuzzying toolkit, allowing for corner case testing, and ensuring that the
   behavior of the library will not change across releases.
   https://github.com/tomato42/tlsfuzzer

** libgnutls: Introduced a lock-free random generator which operates per-thread
   and eliminates random-generator related bottlenecks in multi-threaded operation.
   Resolves gitlab issue #141.
   http://nmav.gnutls.org/2017/03/improving-by-simplifying-gnutls-prng.html

** libgnutls: Replaced the Salsa20 random generator with one based on CHACHA.
   The goal is to reduce code needed in cache (CHACHA is also used for TLS),
   and the number of primitives used by the library. That does not affect the
   AES-DRBG random generator used in FIPS140-2 mode.

** libgnutls: Added support for RSA-PSS key type as well as signatures in
   certificates, and TLS key exchange. Contributed by Daiki Ueno.
   RSA-PSS signatures can be generated by RSA-PSS keys and normal RSA keys,
   but not vice-versa.  The feature includes:
     * RSA-PSS key generation and key handling (in PKCS#8 form)
     * RSA-PSS key generation and key handling from PKCS#11 (with CKM_RSA_PKCS_PSS mech)
     * Handling of RSA-PSS subjectPublicKeyInfo parameters, when present
       in either the private key or certificate.
     * RSA-PSS signing and verification of PKIX certificates
     * RSA-PSS signing and verification of TLS 1.2 handshake
     * RSA-PSS signing and verification of PKCS#7 structures
     * RSA-PSS and RSA key combinations for TLS credentials. That is, when
       multiple keys are supplied, RSA-PSS keys are preferred over RSA for RSA-PSS
       TLS signatures, to contain risks of cross-protocol attacks between the algorithms.
     * RSA-PSS key conversion to RSA PKCS#1 form (certtool --to-rsa)
   Note that RSA-PSS signatures with SHA1 are (intentionally) not supported.

** libgnutls: Added support for Ed25519 signing in certificates and TLS key
   exchange following draft-ietf-tls-rfc4492bis-17.  The feature includes:
     * Ed25519 key generation and key handling (in PKCS#8 form)
     * Ed25519 signing and verification of PKIX certificates
     * Ed25519 signing and verification of TLS 1.2 handshake
     * Ed25519 signing and verification of PKCS#7 structures

** libgnutls: Enabled X25519 key exchange by default, following draft-ietf-tls-rfc4492bis-17.

** libgnutls: Added support for Diffie-Hellman group negotiation following RFC7919.
   That makes the DH parameters negotiation more robust and less prone to errors
   due to insecure parameters. Servers are no longer required to specific explicit
   DH parameters, though if they do these parameters will be used. Group
   selection can be done via priority strings. The introduced strings are
   GROUP-ALL, GROUP-FFDHE2048, GROUP-FFDHE3072, GROUP-FFDHE4096 and
   GROUP-FFDHE8192, as well as the corresponding to curves groups. Note that
   the 6144 group from RFC7919 is not supported.

** libgnutls: Introduced various sanity checks on certificate import. Refuse
   to import certificates which have fractional seconds in Time fields, X.509v1
   certificates which have the unique identifiers set, and certificates with illegal
   version numbers. All of these are prohibited by RFC5280.

** libgnutls: Introduced gnutls_x509_crt_set_flags(). This function can set flags
   in the crt structure. The only flag supported at the moment is
   GNUTLS_X509_CRT_FLAG_IGNORE_SANITY which skips the certificate sanity
   checks on import.

** libgnutls: PKIX certificates with unknown critical extensions are rejected
   on verification with status GNUTLS_CERT_UNKNOWN_CRIT_EXTENSIONS. This
   behavior can be overridden by providing the flag GNUTLS_VERIFY_IGNORE_UNKNOWN_CRIT_EXTENSIONS
   to verification functions. Resolves gitlab issue #177.

** libgnutls: Refuse to generate a certificate with an illegal version, or an
   illegal serial number. That is, gnutls_x509_crt_set_version() and
   gnutls_x509_crt_set_serial(), will fail on input considered to be invalid
   in RFC5280.

** libgnutls: Calls to gnutls_record_send() and gnutls_record_recv()
   prior to handshake being complete are now refused. Addresses gitlab issue #158.

** libgnutls: Added support for PKCS#12 files with no salt (zero length) in their
   password encoding, and PKCS#12 files using SHA384 and SHA512 as MAC.

** libgnutls: Exported functions to encode and decode DSA and ECDSA r,s values.

** libgnutls: Added new callback setting function to gnutls_privkey_t for external
   keys. The new function (gnutls_privkey_import_ext4), allows signing in addition
   to previous algorithms (RSA PKCS#1 1.5, DSA, ECDSA), with RSA-PSS and Ed25519
   keys.

** libgnutls: Introduced the %VERIFY_ALLOW_BROKEN and %VERIFY_ALLOW_SIGN_WITH_SHA1
   priority string options. These allows enabling all broken and SHA1-based signature
   algorithms in certificate verification, respectively.

** libgnutls: 3DES-CBC is no longer included in the default priorities
   list. It has to be explicitly enabled, e.g., with a string like
   "NORMAL:+3DES-CBC".

** libgnutls: SHA1 was marked as insecure for signing certificates. Verification
   of certificates signed with SHA1 is now considered insecure and will
   fail, unless flags intended to enable broken algorithms are set. Other uses
   of SHA1 are still allowed. This can be reverted on compile time with the configure
   flag --enable-sha1-support.

** libgnutls: RIPEMD160 was marked as insecure for certificate signatures. Verification
   of certificates signed with RIPEMD160 hash algorithm is now considered insecure and
   will fail, unless flags intended to enable broken algorithms are set.

** libgnutls: No longer enable SECP192R1 and SECP224R1 by default on TLS handshakes.
   These curves were rarely used for that purpose, provide no advantage over
   x25519 and were deprecated by TLS 1.3.

** libgnutls: Removed support for DEFLATE, or any other compression method.

** libgnutls: OpenPGP authentication was removed; the resulting library is ABI
   compatible, with the openpgp related functions being stubs that fail
   on invocation.

** libgnutls: Removed support for libidn (i.e., IDNA2003); gnutls can now be compiled
   only with libidn2 which provides IDNA2008.

** certtool: The option '--load-ca-certificate' can now accept PKCS#11
   URLs in addition to files.

** certtool: The option '--load-crl' can now be used when generating PKCS#12
   files (i.e., in conjunction with '--to-p12' option).

** certtool: Keys with provable RSA and DSA parameters are now only read and
   exported from PKCS#8 form, following draft-mavrogiannopoulos-pkcs8-validated-parameters-00.txt.
   This removes support for the previous a non-standard key format.

** certtool: Added support for generating, printing and handling RSA-PSS and
   Ed25519 keys and certificates.

** certtool: the parameters --rsa, --dsa and --ecdsa to --generate-privkey are now
   deprecated, replaced by the --key-type option.

** p11tool: The --generate-rsa, --generate-ecc and --generate-dsa options were
   replaced by the --generate-privkey option.

** psktool: Generate 256-bit keys by default.

** gnutls-server: Increase request buffer size to 16kb, and added the --alpn and
   --alpn-fatal options, allowing testing of ALPN negotiation.

** API and ABI modifications:
gnutls_encode_rs_value: Added
gnutls_decode_rs_value: Added
gnutls_base64_encode2: Added
gnutls_base64_decode2: Added
gnutls_x509_crt_set_flags: Added
gnutls_x509_crt_check_ip: Added
gnutls_x509_ext_import_inhibit_anypolicy: Added
gnutls_x509_ext_export_inhibit_anypolicy: Added
gnutls_x509_crt_get_inhibit_anypolicy: Added
gnutls_x509_crt_set_inhibit_anypolicy: Added
gnutls_pubkey_export_rsa_raw2: Added
gnutls_pubkey_export_dsa_raw2: Added
gnutls_pubkey_export_ecc_raw2: Added
gnutls_privkey_export_rsa_raw2: Added
gnutls_privkey_export_dsa_raw2: Added
gnutls_privkey_export_ecc_raw2: Added
gnutls_x509_spki_init: Added
gnutls_x509_spki_deinit: Added
gnutls_x509_spki_get_pk_algorithm: Added
gnutls_x509_spki_set_pk_algorithm: Added
gnutls_x509_spki_get_digest_algorithm: Added
gnutls_x509_spki_set_digest_algorithm: Added
gnutls_x509_spki_get_salt_size: Added
gnutls_x509_spki_set_salt_size: Added
gnutls_x509_crt_set_spki: Added
gnutls_x509_crt_get_spki: Added
gnutls_x509_privkey_get_spki: Added
gnutls_x509_privkey_set_spki: Added
gnutls_x509_crq_get_spki: Added
gnutls_x509_crq_set_spki: Added
gnutls_pubkey_set_spki: Added
gnutls_pubkey_get_spki: Added
gnutls_privkey_set_spki: Added
gnutls_privkey_get_spki: Added
gnutls_privkey_import_ext4: Added
GNUTLS_EXPORT_FLAG_NO_LZ: Added
GNUTLS_DT_IP_ADDRESS: Added
GNUTLS_X509_CRT_FLAG_IGNORE_SANITY: Added
GNUTLS_CERT_UNKNOWN_CRIT_EXTENSIONS: Added
GNUTLS_VERIFY_ALLOW_SIGN_WITH_SHA1: Added
GNUTLS_VERIFY_DO_NOT_ALLOW_IP_MATCHES: Added
GNUTLS_VERIFY_IGNORE_UNKNOWN_CRIT_EXTENSIONS: Added
GNUTLS_SFLAGS_RFC7919: Added


* Version 3.5.7 (released 2016-12-8)

** libgnutls: Include CHACHA20-POLY1305 ciphersuites in the SECURE128
   and SECURE256 priority strings.

** libgnutls: Require libtasn1 4.9; this ensures gnutls will correctly
   operate with OIDs which have elements that exceed 2^32.

** libgnutls: The DN decoding functions output the traditional DN format
   rather than the strict RFC4514 compliant textual DN. This reverts the
   3.5.6 introduced change, and allows applications which depended on the
   previous format to continue to function. Introduced new functions which
   output the strict format by default, and can revert to the old one using
   a flag.

** libgnutls: Improved TPM key handling. Check authorization requirements
   prior to using a key and fix issue on loop for PIN input. Patches by
   James Bottomley.

** libgnutls: In all functions accepting UTF-8 passwords, ensure that
   passwords are normalized according to RFC7613. When invalid UTF-8
   passwords are detected, they are only tolerated for decryption.
   This introduces a libunistring dependency on GnuTLS. A version of
   libunistring is included in the library for the platforms that do
   not ship it; it can be used with the '--with-included-unistring'
   option to configure script.

** libgnutls: When setting a subject alternative name in a certificate
   which is in UTF-8 format, it will transparently be converted to IDNA form
   prior to storing.

** libgnutls: GNUTLS_CRT_PRINT_ONELINE flag on gnutls_x509_crt_print()
   will print the SHA256 key-ID instead of a certificate fingerprint.

** libgnutls: enhance the PKCS#7 verification capabilities. In the case
   signers that are not discoverable using the trust list or input, use
   the stored list as pool to generate a trusted chain to the signer.

** libgnutls: Improved MTU calculation precision for the CBC ciphersuites
   under DTLS.

** libgnutls: [added missing news entry since 3.5.0]
   No longer tolerate certificate key usage violations for
   TLS signature verification, and decryption. That is GnuTLS will fail
   to connect to servers which incorrectly use a restricted to signing certificate
   for decryption, or vice-versa. This reverts the lax behavior introduced
   in 3.1.0, due to several such broken servers being available. The %COMPAT
   priority keyword can be used to work-around connecting on these servers.

** certtool: When exporting a CRQ in DER format ensure no text data are
   intermixed. Patch by Dmitry Eremin-Solenikov.

** certtool: Include the SHA-256 variant of key ID in --certificate-info
   options.

** p11tool: Introduced the --initialize-pin and --initialize-so-pin
   options.

** API and ABI modifications:
gnutls_utf8_password_normalize: Added
gnutls_ocsp_resp_get_responder2: Added
gnutls_x509_crt_get_issuer_dn3: Added
gnutls_x509_crt_get_dn3: Added
gnutls_x509_rdn_get2: Added
gnutls_x509_dn_get_str2: Added
gnutls_x509_crl_get_issuer_dn3: Added
gnutls_x509_crq_get_dn3: Added


* Version 3.5.6 (released 2016-11-04)

** libgnutls: Enhanced the PKCS#7 parser to allow decoding old
[--snip--]
