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) 2013-2017 Nikos Mavrogiannopoulos
See the end for copying conditions.

* 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:
No changes since last version.


* 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 overriden 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
   (pre-rfc5652) structures with arbitrary encapsulated content.

** libgnutls: Introduced a function group to set known DH parameters
   using groups from RFC7919.

** libgnutls: Added more strict RFC4514 textual DN encoding and decoding.
   Now the generated textual DN is in reverse order according to RFC4514,
   and functions which generate a DN from strings such gnutls_x509_crt_set_*dn()
   set the expected DN (reverse of the provided string).

** libgnutls: Introduced time and constraints checks in the end certificate
   in the gnutls_x509_crt_verify_data2() and gnutls_pkcs7_verify_direct()
   functions.

** libgnutls: Set limits on the maximum number of alerts handled. That is,
   applications using gnutls could be tricked into an busy loop if the
   peer sends continuously alert messages. Applications which set a maximum
   handshake time (via gnutls_handshake_set_timeout) will eventually recover
   but others may remain in a busy loops indefinitely. This is related but
   not identical to CVE-2016-8610, due to the difference in alert handling
   of the libraries (gnutls delegates that handling to applications).

** libgnutls: Reverted the change which made the gnutls_certificate_set_*key* 
   functions return an index (introduced in 3.5.5), to avoid affecting programs
   which explicitly check success of the function as equality to zero. In order
   for these functions to return an index an explicit call to gnutls_certificate_set_flags
   with the GNUTLS_CERTIFICATE_API_V2 flag is now required.

** libgnutls: Reverted the behavior of sending a status request extension even
   without a response (introduced in 3.5.5). That is, we no longer reply to a
   client's hello with a status request, with a status request extension. Although
   that behavior is legal, it creates incompatibility issues with releases in
   the gnutls 3.3.x branch.

** libgnutls: Delayed the initialization of the random generator at
   the first call of gnutls_rnd(). This allows applications to load
   on systems which getrandom() would block, without blocking until
   real random data are needed.

** certtool: --get-dh-params will output parameters from the RFC7919
   groups.

** p11tool: improvements in --initialize option.

** API and ABI modifications:
GNUTLS_CERTIFICATE_API_V2: Added
GNUTLS_NO_TICKETS: Added
gnutls_pkcs7_get_embedded_data_oid: Added
gnutls_anon_set_server_known_dh_params: Added
gnutls_certificate_set_known_dh_params: Added
gnutls_psk_set_server_known_dh_params: Added
gnutls_x509_crt_check_key_purpose: Added


* Version 3.5.5 (released 2016-10-09)

** libgnutls: enhanced gnutls_certificate_set_ocsp_status_request_file()
   to allow importing multiple OCSP request files, one for each chain
   provided.

** libgnutls: The gnutls_certificate_set_key* functions return an
   index of the added chain. That index can be used either with
   gnutls_certificate_set_ocsp_status_request_file(), or with
   gnutls_certificate_get_crt_raw() and friends.

** libgnutls: Added SHA*, AES-GCM, AES-CCM and AES-CBC optimized implementations
   for the aarch64 architecture. Uses Andy Polyakov's assembly code.

** libgnutls: Ensure proper cleanups on gnutls_certificate_set_*key()
   failures due to key mismatch. This prevents leaks or double freeing
   on such failures.

** libgnutls: Increased the maximum size of the handshake message hash.
   This will allow the library to cope better with larger packets, as
   the ones offered by current TLS 1.3 drafts.

** libgnutls: Allow to use client certificates despite them containing
   disallowed algorithms for a session. That allows for example 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).

** libgnutls: Reverted AESNI code on x86 to earlier version as the
   latest version was creating position depending code. Added checks
   in the CI to detect position depending code early.

** guile: Update code to the I/O port API of Guile >= 2.1.4
   This makes sure the GnuTLS bindings will work with the forthcoming 2.2
   stable series of Guile, of which 2.1 is a preview.

** API and ABI modifications:
gnutls_certificate_set_ocsp_status_request_function2: Added
gnutls_session_ext_register: Added
gnutls_session_supplemental_register: Added
GNUTLS_E_PK_INVALID_PUBKEY: Added
GNUTLS_E_PK_INVALID_PRIVKEY: Added


* Version 3.5.4 (released 2016-09-08)

** libgnutls: Corrected the comparison of the serial size in OCSP response.
   Previously the OCSP certificate check wouldn't verify the serial length
   and could succeed in cases it shouldn't (GNUTLS-SA-2016-3).
   Reported by Stefan Buehler.

** libgnutls: Added support for IP name constraints. Patch by Martin Ukrop.

** libgnutls: Added support of PKCS#8 file decryption using DES-CBC-MD5. This
   is added to allow decryption of PKCS #8 private keys from openssl prior to 1.1.0.

** libgnutls: Added support for decrypting PKCS#8 files which use HMAC-SHA256
   as PRF. This allow decrypting PKCS #8 private keys generated with openssl 1.1.0.

** libgnutls: Added support for internationalized passwords in PKCS#12 files.
   Previous versions would only encrypt or decrypt using passwords from the ASCII
   set.

** libgnutls: Addressed issue with PKCS#11 signature generation on ECDSA
   keys. The signature is now written as unsigned integers into the DSASignatureValue
   structure. Previously signed integers could be written depending on what
   the underlying module would produce. Addresses #122.

** gnutls-cli: Fixed starttls regression from 3.5.3.

** API and ABI modifications:
GNUTLS_E_MALFORMED_CIDR: Added
gnutls_x509_cidr_to_rfc5280: Added
gnutls_oid_to_mac: Added


* Version 3.5.3 (released 2016-08-09)

** libgnutls: Added support for TCP fast open (RFC7413), allowing
   to reduce by one round-trip the handshake process. Based on proposal and
   patch by Tim Ruehsen.

** libgnutls: Adopted a simpler with less memory requirements DTLS sliding
   window implementation. Based on Fridolin Pokorny's implementation for
   AF_KTLS.

** libgnutls: Use getrandom where available via the syscall interface.
   This works around an issue of not-using getrandom even if it exists
   since glibc doesn't declare such function.

** libgnutls: Fixed DNS name constraints checking in the case of empty
   intersection of domain names in the chain. Report and fix by Martin Ukrop.

** libgnutls: Fixed name constraints checking in the case of chains
   where the higher level certificates contained different types of
   constraints than the ones present in the lower intermediate CAs.
   Report and fix by Martin Ukrop.

** libgnutls: Dropped support for the EGD random generator.

** libgnutls: Allow the decoding of raw elements (starting with #)
   in RFC4514 DN string decoding.

** libgnutls: Fixes in gnutls_x509_crt_list_import2, which was
   ignoring flags if all certificates in the list fit within the
   initially allocated memory. Patch by Tim Kosse.

** libgnutls: Corrected issue which made gnutls_certificate_get_x509_crt()
   to return invalid pointers when returned more than a single certificate.
   Report and fix by Stefan Sørensen.

** libgnutls: Fix gnutls_pkcs12_simple_parse to always extract the complete chain,
   even when the extra_certs was non-null. Report and fix by Stefan Sørensen.

** certtool: Added the "add_extension" and "add_critical_extension"
   template options. This allows specifying arbitrary extensions into
   certificates and certificate requests.

** gnutls-cli: Added the --fastopen option.

** API and ABI modifications:
GNUTLS_E_UNAVAILABLE_DURING_HANDSHAKE: Added
gnutls_x509_crq_set_extension_by_oid: Added
gnutls_x509_dn_set_str: Added
gnutls_transport_set_fastopen: Added


* Version 3.5.2 (released 2016-07-06)

** libgnutls: Address issue when utilizing the p11-kit trust store
   for certificate verification (GNUTLS-SA-2016-2).

** libgnutls: Fixed DTLS handshake packet reconstruction. Reported by
   Guillaume Roguez.

** libgnutls: Fixed issues with PKCS#11 reading of sensitive objects
   from SafeNet Network HSM. Reported by Anthony Alba in #108.

** libgnutls: Corrected the writing of PKCS#11 CKA_SERIAL_NUMBER. Report
   and fix by Stanislav Židek.

** libgnutls: Added AES-GCM optimizations using the AVX and MOVBE
   instructions. Uses Andy Polyakov's assembly code.

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


* Version 3.5.1 (released 2016-06-14)

** libgnutls: The SSL 3.0 protocol support can completely be removed
   using a compile time option. The configure option is --disable-ssl3-support.

** libgnutls: The SSL 2.0 client hello support can completely be removed
   using a compile time option. The configure option is --disable-ssl2-support.

** libgnutls: Added support for OCSP Must staple PKIX extension. That is,
   implemented the RFC7633 TLSFeature for OCSP status request extension.
   Feature implemented by Tim Kosse.

** libgnutls: More strict OCSP staple verification. That is, no longer
   ignore invalid or too old OCSP staples. The previous behavior was
   to rely on application use gnutls_ocsp_status_request_is_checked(),
   while the new behavior is to include OCSP verification by default
   and set the GNUTLS_CERT_INVALID_OCSP_STATUS verification flag on error.

** libgnutls: Treat CA certificates with the "Server Gated Cryptography" key
   purpose OIDs equivalent to having the GNUTLS_KP_TLS_WWW_SERVER OID. This
   improves interoperability with several old intermediate CA certificates
   carrying these legacy OIDs.

** libgnutls: Re-read the system wide priority file when needed. Patch by
   Daniel P. Berrange.

** libgnutls: Allow for fallback in system-specific initial keywords
   (prefixed with '@'). That allows to specify a keyword such as
   "@KEYWORD1,KEYWORD2" which will use the first available of these
   two keywords. Patch by Daniel P. Berrange.

** libgnutls: The SSLKEYLOGFILE environment variable can be used to log
   session keys. These session keys are compatible with the NSS Key Log
   Format and can be used to decrypt the session for debugging using
   wireshark.

** API and ABI modifications:
GNUTLS_CERT_INVALID_OCSP_STATUS: Added
gnutls_x509_crt_set_crq_extension_by_oid: Added
gnutls_x509_ext_import_tlsfeatures: Added
gnutls_x509_ext_export_tlsfeatures: Added
gnutls_x509_tlsfeatures_add: Added
gnutls_x509_tlsfeatures_init: Added
gnutls_x509_tlsfeatures_deinit: Added
gnutls_x509_tlsfeatures_get: Added
gnutls_x509_crt_get_tlsfeatures: Added
gnutls_x509_crt_set_tlsfeatures: Added
gnutls_x509_crq_get_tlsfeatures: Added
gnutls_x509_crq_set_tlsfeatures: Added
gnutls_ext_get_name: Added


* Version 3.5.0 (released 2016-05-09)

** libgnutls: Added SHA3 based signing algorithms for DSA, RSA and ECDSA,
   based on http://csrc.nist.gov/groups/ST/crypto_apps_infra/csor/algorithms.html

** libgnutls: Added support for curve X25519 (RFC 7748, draft-ietf-tls-rfc4492bis-07).
   This curve is disabled by default as it is still on specification status. It
   can be enabled using the priority string modifier +CURVE-X25519.

** libgnutls: Added support for TLS false start (draft-ietf-tls-falsestart-01)
   by introducing gnutls_init() flag GNUTLS_ENABLE_FALSE_START (#73).

** libgnutls: Added new APIs to access the FIPS186-4 (Shawe-Taylor based) provable
   RSA and DSA parameter generation from a seed.

** libgnutls: The CHACHA20-POLY1305 ciphersuite is enabled by default. This
   cipher is prioritized after AES-GCM.

** libgnutls: On a rehandshake ensure that the certificate of the peer or
   its username remains the same as in previous handshakes. That is to protect
   applications which do not check user credentials on rehandshakes. The
   threat to address depends on the application protocol. Primarily it
   protects against applications which authenticate the peer initially and
   perform accounting using the session's information, from being misled
   by a rehandshake which switches the peer's identity. Applications can
   disable this protection by using the %GNUTLS_ALLOW_ID_CHANGE flag in
   gnutls_init().

** libgnutls: 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.

** libgnutls: Be strict in TLS extension decoding. That is, do not tolerate
   parsing errors in the extensions field and treat it as a typical Hello
   message structure. Reported by Hubert Kario (#40).

** libgnutls: Old and unsupported version numbers in client hellos are
   rejected with a "protocol_version" alert message. Reported by Hubert
   Kario (#42).

** libgnutls: Lifted the limitation of calling the gnutls_session_get_data*()
   functions, only on non-resumed sessions. This brings the API in par with
   its usage (#79).

** libgnutls: Follow RFC5280 strictly in name constraints computation. The
   permitted subtrees is intersected with any previous values. Report and
   patch by Daiki Ueno.

** libgnutls: Enforce the RFC 7627 (extended master secret) requirements on
   session resumption. Reported by Hubert Kario (#69).

** libgnutls: Consider the max-record TLS extension even when under DTLS.
   Reported by Peter Dettman (#61).

** libgnutls: Replaced writev() system call with sendmsg().

** libgnutls: Replaced select() system call with poll() on POSIX systems.

** libgnutls: Preload the system priority file on library load. This allows
   applications that chroot() to also use the system priorities.

** libgnutls: Applications are allowed to override the built-in key and
   certificate URLs.

** libgnutls: The gnutls.h header marks constant and pure functions explictly.

** certtool: Added the ability to sign certificates using SHA3.

** certtool: Added the --provable and --verify-allow-broken options.

** gnutls-cli: The --dane option will cause verification failure if gnutls is not
   compiled with DANE support.

** crywrap: The tool was unbundled from gnutls' distribution. It can be found at
   https://github.com/nmav/crywrap

** guile: .go files are now built and installed

** guile: Fix compatibility issue of the test suite with Guile 2.1

** guile: When --with-guile-site-dir is passed, modules are installed in a
   versioned directory, typically $(datadir)/guile/site/2.0

** guile: Tests no longer leave zombie processes behind

** API and ABI modifications:
GNUTLS_FORCE_CLIENT_CERT: Added
GNUTLS_ENABLE_FALSE_START: Added
GNUTLS_INDEFINITE_TIMEOUT: Added
GNUTLS_ALPN_SERVER_PRECEDENCE: Added
GNUTLS_E_ASN1_EMBEDDED_NULL_IN_STRING: Added
GNUTLS_E_HANDSHAKE_DURING_FALSE_START: Added
gnutls_check_version_numeric: Added
gnutls_x509_crt_equals: Added
gnutls_x509_crt_equals2: Added
gnutls_x509_crt_set_subject_alt_othername: Added
gnutls_x509_crt_set_issuer_alt_othername: Added
gnutls_x509_crt_get_signature_oid: Added
gnutls_x509_crt_get_pk_oid: Added
gnutls_x509_crq_set_subject_alt_othername: Added
gnutls_x509_crq_get_pk_oid: Added
gnutls_x509_crq_get_signature_oid: Added
gnutls_x509_crl_get_signature_oid: Added
gnutls_x509_privkey_generate2: Added
gnutls_x509_privkey_get_seed: Added
gnutls_x509_privkey_verify_seed: Added
gnutls_privkey_generate2: Added
gnutls_privkey_get_seed: Added
gnutls_privkey_verify_seed: Added
gnutls_decode_ber_digest_info: Added
gnutls_encode_ber_digest_info: Added
gnutls_dh_params_import_dsa: Added
gnutls_session_get_master_secret: Added


* Version 3.4.3 (released 2015-07-12)

** libgnutls: Follow closely RFC5280 recommendations and use UTCTime for
   dates prior to 2050.

** libgnutls: Force 16-byte alignment to all input to ciphers (previously it
   was done only when cryptodev was enabled).

** libgnutls: Removed support for pthread_atfork() as it has undefined
   semantics when used with dlopen(), and may lead to a crash.

** libgnutls: corrected failure when importing plain files 
   with gnutls_x509_privkey_import2(), and a password was provided.

** libgnutls: Don't reject certificates if a CA has the URI or IP address
   name constraints, and the end certificate doesn't have an IP address 
   name or a URI set.

** libgnutls: set and read the hint in DHE-PSK and ECDHE-PSK ciphersuites.

** p11tool: Added --list-token-urls option, and print the token module name
   in list-tokens.

** API and ABI modifications:
gnutls_ecc_curve_get_oid: Added
gnutls_digest_get_oid: Added
gnutls_pk_get_oid: Added
gnutls_sign_get_oid: Added
gnutls_ecc_curve_get_id: Added
gnutls_oid_to_digest: Added
gnutls_oid_to_pk: Added
gnutls_oid_to_sign: Added
gnutls_oid_to_ecc_curve: Added
gnutls_pkcs7_get_signature_count: Added


* Version 3.4.2 (released 2015-06-16)

** libgnutls: DTLS blocking API is more robust against infinite blocking,
and will notify of more possible timeouts.

** libgnutls: corrected regression with Camellia-256-GCM cipher. Reported
by Manuel Pegourie-Gonnard.

** libgnutls: Introduced the GNUTLS_NO_SIGNAL flag to gnutls_init(). That
allows to disable SIGPIPE for writes done within gnutls.

** libgnutls: Enhanced the PKCS #7 API to allow signing and verification
of structures. API moved to gnutls/pkcs7.h header.

** certtool: Added options to generate PKCS #7 bundles and signed
structures.

** API and ABI modifications:
gnutls_x509_dn_get_str: Added
gnutls_pkcs11_get_raw_issuer_by_subject_key_id: Added
gnutls_x509_trust_list_get_issuer_by_subject_key_id: Added
gnutls_x509_crt_verify_data2: Added
gnutls_pkcs7_get_crt_raw2: Added
gnutls_pkcs7_signature_info_deinit: Added
gnutls_pkcs7_get_signature_info: Added
gnutls_pkcs7_verify_direct: Added
gnutls_pkcs7_verify: Added
gnutls_pkcs7_get_crl_raw2: Added
gnutls_pkcs7_sign: Added
gnutls_pkcs7_attrs_deinit: Added
gnutls_pkcs7_add_attr: Added
gnutls_pkcs7_get_attr: Added
gnutls_pkcs7_print: Added


* Version 3.4.1 (released 2015-05-03)

** libgnutls: gnutls_certificate_get_ours: will return the certificate even
if a callback was used to send it.

** libgnutls: Check for invalid length in the X.509 version field. Without
the check certificates with invalid length would be detected as having an
arbitrary version. Reported by Hanno Böck.

** libgnutls: Handle DNS name constraints with a leading dot. Patch by
Fotis Loukos.

** libgnutls: Updated system-keys support for windows to compile in more
versions of mingw. Patch by Tim Kosse.

** libgnutls: Fix for MD5 downgrade in TLS 1.2 signatures. Reported by
Karthikeyan Bhargavan [GNUTLS-SA-2015-2].

** libgnutls: Reverted: The gnutls_handshake() process will enforce a timeout
by default. That caused issues with non-blocking programs.

** certtool: It can generate SHA256 key IDs.

** gnutls-cli: fixed crash in --benchmark-ciphers. Reported by James Cloos.

** configure: re-enabled the --enable-local-libopts flag

** API and ABI modifications:
gnutls_x509_crt_get_pk_ecc_raw: Added


* Version 3.4.0 (released 2015-04-08)

** libgnutls: Added support for AES-CCM and AES-CCM-8 (RFC6655 and RFC7251)
ciphersuites. The former are enabled by default, the latter need to be
explicitly enabled, since they reduce the overall security level.

** libgnutls: Added support for Chacha20-Poly1305 ciphersuites following
draft-mavrogiannopoulos-chacha-tls-05 and draft-irtf-cfrg-chacha20-poly1305-10.
That is currently provided as technology preview and is not enabled by
default, since there are no assigned ciphersuite points by IETF and there 
is no guarrantee of compatibility between draft versions. The ciphersuite
priority string to enable it is "+CHACHA20-POLY1305".

** libgnutls: Added support for encrypt-then-authenticate in CBC
ciphersuites (RFC7366 -taking into account its errata text). This is
enabled by default and can be disabled using the %NO_ETM priority
string.

** libgnutls: Added support for the extended master secret
(triple-handshake fix) following draft-ietf-tls-session-hash-02.

** libgnutls: Added a new simple and hard to misuse AEAD API (crypto.h).

** libgnutls: SSL 3.0 is no longer included in the default priorities
list. It has to be explicitly enabled, e.g., with a string like
"NORMAL:+VERS-SSL3.0".

** libgnutls: ARCFOUR (RC4) is no longer included in the default priorities
list. It has to be explicitly enabled, e.g., with a string like
"NORMAL:+ARCFOUR-128".

** libgnutls: DSA signatures and DHE-DSS are no longer included in the
default priorities list. They have to be explicitly enabled, e.g., with
a string like "NORMAL:+DHE-DSS:+SIGN-DSA-SHA256:+SIGN-DSA-SHA1". The
DSA ciphersuites were dropped because they had no deployment at all
on the internet, to justify their inclusion.

** libgnutls: The priority string EXPORT was completely removed. The string
was already defunc as support for the EXPORT ciphersuites was removed in
GnuTLS 3.2.0.

** libgnutls: Added API to utilize system specific private keys in
"gnutls/system-keys.h". It is currently provided as technology preview
and is restricted to windows CNG keys.

** libgnutls: gnutls_x509_crt_check_hostname() and friends will use
RFC6125 comparison of hostnames. That introduces a dependency on libidn.

** libgnutls: Depend on p11-kit 0.23.1 to comply with the final
PKCS #11 URLs draft (draft-pechanec-pkcs11uri-21).

** libgnutls: Depend on nettle 3.1.

** libgnutls: Use getrandom() or getentropy() when available. That
avoids the complexity of file descriptor handling and issues with
applications closing all open file descriptors on startup.

** libgnutls: Use pthread_atfork() to detect fork when available.

** libgnutls: If a key purpose (extended key usage) is specified for verification,
it is applied into intermediate certificates. The verification result
GNUTLS_CERT_PURPOSE_MISMATCH is also introduced. 

** libgnutls: When gnutls_certificate_set_x509_key_file2() is used in
combination with PKCS #11, or TPM URLs, it will utilize the provided
password as PIN if required. That removes the requirement for the
application to set a callback for PINs in that case.

** libgnutls: priority strings VERS-TLS-ALL and VERS-DTLS-ALL are 
restricted to the corresponding protocols only, and the VERS-ALL
string is introduced to catch all possible protocols.

** libgnutls: Added helper functions to obtain information on PKCS #8
structures.

** libgnutls: Certificate chains which are provided to gnutls_certificate_credentials_t
will automatically be sorted instead of failing with GNUTLS_E_CERTIFICATE_LIST_UNSORTED.

** libgnutls: Added functions to export and set the record state. That
allows for gnutls_record_send() and recv() to be offloaded (to kernel,
hardware or any other subsystem).

** libgnutls: Added the ability to register application specific URL
types, which express certificates and keys using gnutls_register_custom_url().

** libgnutls: Added API to override existing ciphers, digests and MACs, e.g.,
to override AES-GCM using a system-specific accelerator. That is, (crypto.h)
gnutls_crypto_register_cipher(), gnutls_crypto_register_aead_cipher(),
gnutls_crypto_register_mac(), and gnutls_crypto_register_digest().

** libgnutls: Added gnutls_ext_register() to register custom extensions.
Contributed by Thierry Quemerais.

** libgnutls: Added gnutls_supplemental_register() to register custom
supplemental data handshake messages. Contributed by Thierry Quemerais.

** libgnutls-openssl: it is no longer built by default.


** certtool: Added --p8-info option, which will print PKCS #8 information
even if the password is not available.

** certtool: --key-info option will print PKCS #8 encryption information
when available.

** certtool: Added the --key-id and --fingerprint options.

** certtool: Added the --verify-hostname, --verify-email and --verify-purpose
options to be used in certificate chain verification, to simulate verification
for specific hostname and key purpose (extended key usage).

** certtool: --p12-info option will print PKCS #12 MAC and cipher information
when available.

** certtool: it will print the A-label (ACE) names in addition to UTF-8.

** p11tool: added options --set-id and --set-label.

** gnutls-cli: added options --priority-list and --save-cert.

** guile: Deprecated priority API has been removed. The old priority API, 
which had been deprecated for some time, is now gone; use 'set-session-priorities!'
instead.

** guile: Remove RSA parameters and related procedures. This API had been 
deprecated.  

** guile: Fix compilation on MinGW. Previously only the static version of the 
'guile-gnutls-v-2' library would be built, preventing dynamic loading from Guile.

** API and ABI modifications:
gnutls_record_get_state: Added
gnutls_record_set_state: Added
gnutls_aead_cipher_init: Added
gnutls_aead_cipher_decrypt: Added
gnutls_aead_cipher_encrypt: Added
gnutls_aead_cipher_deinit: Added
gnutls_pkcs12_generate_mac2: Added
gnutls_pkcs12_mac_info: Added
gnutls_pkcs12_bag_enc_info: Added
gnutls_pkcs8_info: Added
gnutls_pkcs_schema_get_name: Added
gnutls_pkcs_schema_get_oid: Added
gnutls_pcert_export_x509: Added
gnutls_pcert_export_openpgp: Added
gnutls_pcert_import_x509_list: Added
gnutls_pkcs11_privkey_cpy: Added
gnutls_x509_crq_get_signature_algorithm: Added
gnutls_x509_trust_list_iter_get_ca: Added
gnutls_x509_trust_list_iter_deinit: Added
gnutls_x509_trust_list_get_issuer_by_dn: Added
gnutls_pkcs11_get_raw_issuer_by_dn: Added
gnutls_certificate_get_trust_list: Added
gnutls_privkey_export_x509: Added
gnutls_privkey_export_pkcs11: Added
gnutls_privkey_export_openpgp: Added
gnutls_privkey_import_ext3: Added
gnutls_certificate_get_x509_key: Added
gnutls_certificate_get_x509_crt: Added
gnutls_certificate_get_openpgp_key: Added
gnutls_certificate_get_openpgp_crt: Added
gnutls_record_discard_queued: Added
gnutls_session_ext_master_secret_status: Added
gnutls_priority_string_list: Added
gnutls_dh_params_import_raw2: Added
gnutls_memset: Added
gnutls_memcmp: Added
gnutls_pkcs12_bag_set_privkey: Added
gnutls_ocsp_resp_get_responder_raw_id: Added
gnutls_system_key_iter_deinit: Added
gnutls_system_key_iter_get_info: Added
gnutls_system_key_delete: Added
gnutls_system_key_add_x509: Added
gnutls_system_recv_timeout: Added
gnutls_register_custom_url: Added
gnutls_pkcs11_obj_list_import_url3: Added
gnutls_pkcs11_obj_list_import_url4: Added
gnutls_pkcs11_obj_set_info: Added
gnutls_crypto_register_cipher: Added
gnutls_crypto_register_aead_cipher: Added
gnutls_crypto_register_mac: Added
gnutls_crypto_register_digest: Added
gnutls_ext_register: Added
