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ChangeLog
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Mbed TLS ChangeLog (Sorted per branch, date)
= Mbed TLS 3.4.0 branch released 2023-03-28
Default behavior changes
* The default priority order of TLS 1.3 cipher suites has been modified to
follow the same rules as the TLS 1.2 cipher suites (see
ssl_ciphersuites.c). The preferred cipher suite is now
TLS_CHACHA20_POLY1305_SHA256.
New deprecations
* mbedtls_x509write_crt_set_serial() is now being deprecated in favor of
mbedtls_x509write_crt_set_serial_raw(). The goal here is to remove any
direct dependency of X509 on BIGNUM_C.
* PSA to mbedtls error translation is now unified in psa_util.h,
deprecating mbedtls_md_error_from_psa. Each file that performs error
translation should define its own version of PSA_TO_MBEDTLS_ERR,
optionally providing file-specific error pairs. Please see psa_util.h for
more details.
Features
* Added partial support for parsing the PKCS #7 Cryptographic Message
Syntax, as defined in RFC 2315. Currently, support is limited to the
following:
- Only the signed-data content type, version 1 is supported.
- Only DER encoding is supported.
- Only a single digest algorithm per message is supported.
- Certificates must be in X.509 format. A message must have either 0
or 1 certificates.
- There is no support for certificate revocation lists.
- The authenticated and unauthenticated attribute fields of SignerInfo
must be empty.
Many thanks to Daniel Axtens, Nayna Jain, and Nick Child from IBM for
contributing this feature, and to Demi-Marie Obenour for contributing
various improvements, tests and bug fixes.
* General performance improvements by accessing multiple bytes at a time.
Fixes #1666.
* Improvements to use of unaligned and byte-swapped memory, reducing code
size and improving performance (depending on compiler and target
architecture).
* Add support for reading points in compressed format
(MBEDTLS_ECP_PF_COMPRESSED) with mbedtls_ecp_point_read_binary()
(and callers) for Short Weierstrass curves with prime p where p = 3 mod 4
(all mbedtls MBEDTLS_ECP_DP_SECP* and MBEDTLS_ECP_DP_BP* curves
except MBEDTLS_ECP_DP_SECP224R1 and MBEDTLS_ECP_DP_SECP224K1)
* SHA224_C/SHA384_C are now independent from SHA384_C/SHA512_C respectively.
This helps in saving code size when some of the above hashes are not
required.
* Add parsing of V3 extensions (key usage, Netscape cert-type,
Subject Alternative Names) in x509 Certificate Sign Requests.
* Use HOSTCC (if it is set) when compiling C code during generation of the
configuration-independent files. This allows them to be generated when
CC is set for cross compilation.
* Add parsing of uniformResourceIdentifier subtype for subjectAltName
extension in x509 certificates.
* Add an interruptible version of sign and verify hash to the PSA interface,
backed by internal library support for ECDSA signing and verification.
* Add parsing of rfc822Name subtype for subjectAltName
extension in x509 certificates.
* The configuration macros MBEDTLS_PSA_CRYPTO_PLATFORM_FILE and
MBEDTLS_PSA_CRYPTO_STRUCT_FILE specify alternative locations for
the headers "psa/crypto_platform.h" and "psa/crypto_struct.h".
* When a PSA driver for ECDSA is present, it is now possible to disable
MBEDTLS_ECDSA_C in the build in order to save code size. For PK, X.509
and TLS to fully work, this requires MBEDTLS_USE_PSA_CRYPTO to be enabled.
Restartable/interruptible ECDSA operations in PK, X.509 and TLS are not
supported in those builds yet, as driver support for interruptible ECDSA
operations is not present yet.
* Add a driver dispatch layer for EC J-PAKE, enabling alternative
implementations of EC J-PAKE through the driver entry points.
* Add new API mbedtls_ssl_cache_remove for cache entry removal by
its session id.
* Add support to include the SubjectAltName extension to a CSR.
* Add support for AES with the Armv8-A Cryptographic Extension on
64-bit Arm. A new configuration option, MBEDTLS_AESCE_C, can
be used to enable this feature. Run-time detection is supported
under Linux only.
* When a PSA driver for EC J-PAKE is present, it is now possible to disable
MBEDTLS_ECJPAKE_C in the build in order to save code size. For the
corresponding TLS 1.2 key exchange to work, MBEDTLS_USE_PSA_CRYPTO needs
to be enabled.
* Add functions mbedtls_rsa_get_padding_mode() and mbedtls_rsa_get_md_alg()
to read non-public fields for padding mode and hash id from
an mbedtls_rsa_context, as requested in #6917.
* AES-NI is now supported with Visual Studio.
* AES-NI is now supported in 32-bit builds, or when MBEDTLS_HAVE_ASM
is disabled, when compiling with GCC or Clang or a compatible compiler
for a target CPU that supports the requisite instructions (for example
gcc -m32 -msse2 -maes -mpclmul). (Generic x86 builds with GCC-like
compilers still require MBEDTLS_HAVE_ASM and a 64-bit target.)
* It is now possible to use a PSA-held (opaque) password with the TLS 1.2
ECJPAKE key exchange, using the new API function
mbedtls_ssl_set_hs_ecjpake_password_opaque().
Security
* Use platform-provided secure zeroization function where possible, such as
explicit_bzero().
* Zeroize SSL cache entries when they are freed.
* Fix a potential heap buffer overread in TLS 1.3 client-side when
MBEDTLS_DEBUG_C is enabled. This may result in an application crash.
* Add support for AES with the Armv8-A Cryptographic Extension on 64-bit
Arm, so that these systems are no longer vulnerable to timing side-channel
attacks. This is configured by MBEDTLS_AESCE_C, which is on by default.
Reported by Demi Marie Obenour.
* MBEDTLS_AESNI_C, which is enabled by default, was silently ignored on
builds that couldn't compile the GCC-style assembly implementation
(most notably builds with Visual Studio), leaving them vulnerable to
timing side-channel attacks. There is now an intrinsics-based AES-NI
implementation as a fallback for when the assembly one cannot be used.
Bugfix
* Fix possible integer overflow in mbedtls_timing_hardclock(), which
could cause a crash in programs/test/benchmark.
* Fix IAR compiler warnings. Fixes #6924.
* Fix a bug in the build where directory names containing spaces were
causing generate_errors.pl to error out resulting in a build failure.
Fixes issue #6879.
* In TLS 1.3, when using a ticket for session resumption, tweak its age
calculation on the client side. It prevents a server with more accurate
ticket timestamps (typically timestamps in milliseconds) compared to the
Mbed TLS ticket timestamps (in seconds) to compute a ticket age smaller
than the age computed and transmitted by the client and thus potentially
reject the ticket. Fix #6623.
* Fix compile error where MBEDTLS_RSA_C and MBEDTLS_X509_CRT_WRITE_C are
defined, but MBEDTLS_PK_RSA_ALT_SUPPORT is not defined. Fixes #3174.
* List PSA_WANT_ALG_CCM_STAR_NO_TAG in psa/crypto_config.h so that it can
be toggled with config.py.
* The key derivation algorithm PSA_ALG_TLS12_ECJPAKE_TO_PMS cannot be
used on a shared secret from a key agreement since its input must be
an ECC public key. Reject this properly.
* mbedtls_x509write_crt_set_serial() now explicitly rejects serial numbers
whose binary representation is longer than 20 bytes. This was already
forbidden by the standard (RFC5280 - section 4.1.2.2) and now it's being
enforced also at code level.
* Fix potential undefined behavior in mbedtls_mpi_sub_abs(). Reported by
Pascal Cuoq using TrustInSoft Analyzer in #6701; observed independently by
Aaron Ucko under Valgrind.
* Fix behavior of certain sample programs which could, when run with no
arguments, access uninitialized memory in some cases. Fixes #6700 (which
was found by TrustInSoft Analyzer during REDOCS'22) and #1120.
* Fix parsing of X.509 SubjectAlternativeName extension. Previously,
malformed alternative name components were not caught during initial
certificate parsing, but only on subsequent calls to
mbedtls_x509_parse_subject_alt_name(). Fixes #2838.
* Make the fields of mbedtls_pk_rsassa_pss_options public. This makes it
possible to verify RSA PSS signatures with the pk module, which was
inadvertently broken since Mbed TLS 3.0.
* Fix bug in conversion from OID to string in
mbedtls_oid_get_numeric_string(). OIDs such as 2.40.0.25 are now printed
correctly.
* Reject OIDs with overlong-encoded subidentifiers when converting
them to a string.
* Reject OIDs with subidentifier values exceeding UINT_MAX. Such
subidentifiers can be valid, but Mbed TLS cannot currently handle them.
* Reject OIDs that have unterminated subidentifiers, or (equivalently)
have the most-significant bit set in their last byte.
* Silence warnings from clang -Wdocumentation about empty \retval
descriptions, which started appearing with Clang 15. Fixes #6960.
* Fix the handling of renegotiation attempts in TLS 1.3. They are now
systematically rejected.
* Fix an unused-variable warning in TLS 1.3-only builds if
MBEDTLS_SSL_RENEGOTIATION was enabled. Fixes #6200.
* Fix undefined behavior in mbedtls_ssl_read() and mbedtls_ssl_write() if
len argument is 0 and buffer is NULL.
* Allow setting user and peer identifiers for EC J-PAKE operation
instead of role in PAKE PSA Crypto API as described in the specification.
This is a partial fix that allows only "client" and "server" identifiers.
* Fix a compilation error when PSA Crypto is built with support for
TLS12_PRF but not TLS12_PSK_TO_MS. Reported by joerchan in #7125.
* In the TLS 1.3 server, select the preferred client cipher suite, not the
least preferred. The selection error was introduced in Mbed TLS 3.3.0.
* Fix TLS 1.3 session resumption when the established pre-shared key is
384 bits long. That is the length of pre-shared keys created under a
session where the cipher suite is TLS_AES_256_GCM_SHA384.
* Fix an issue when compiling with MBEDTLS_SHA512_USE_A64_CRYPTO_IF_PRESENT
enabled, which required specifying compiler flags enabling SHA3 Crypto
Extensions, where some compilers would emit EOR3 instructions in other
modules, which would then fail if run on a CPU without the SHA3
extensions. Fixes #5758.
Changes
* Install the .cmake files into CMAKE_INSTALL_LIBDIR/cmake/MbedTLS,
typically /usr/lib/cmake/MbedTLS.
* Mixed-endian systems are explicitly not supported any more.
* When MBEDTLS_USE_PSA_CRYPTO and MBEDTLS_ECDSA_DETERMINISTIC are both
defined, mbedtls_pk_sign() now use deterministic ECDSA for ECDSA
signatures. This aligns the behaviour with MBEDTLS_USE_PSA_CRYPTO to
the behaviour without it, where deterministic ECDSA was already used.
* Visual Studio: Rename the directory containing Visual Studio files from
visualc/VS2010 to visualc/VS2013 as we do not support building with versions
older than 2013. Update the solution file to specify VS2013 as a minimum.
* programs/x509/cert_write:
- now it accepts the serial number in 2 different formats: decimal and
hex. They cannot be used simultaneously
- "serial" is used for the decimal format and it's limted in size to
unsigned long long int
- "serial_hex" is used for the hex format; max length here is
MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN*2
* The C code follows a new coding style. This is transparent for users but
affects contributors and maintainers of local patches. For more
information, see
https://mbed-tls.readthedocs.io/en/latest/kb/how-to/rewrite-branch-for-coding-style/
* Changed the default MBEDTLS_ECP_WINDOW_SIZE from 6 to 2.
As tested in issue 6790, the correlation between this define and
RSA decryption performance has changed lately due to security fixes.
To fix the performance degradation when using default values the
window was reduced from 6 to 2, a value that gives the best or close
to best results when tested on Cortex-M4 and Intel i7.
* When enabling MBEDTLS_SHA256_USE_A64_CRYPTO_* or
MBEDTLS_SHA512_USE_A64_CRYPTO_*, it is no longer necessary to specify
compiler target flags on the command line; the library now sets target
options within the appropriate modules.
= Mbed TLS 3.3.0 branch released 2022-12-14
Default behavior changes
* Previously the macro MBEDTLS_SSL_DTLS_CONNECTION_ID implemented version 05
of the IETF draft, and was marked experimental and disabled by default.
It is now no longer experimental, and implements the final version from
RFC 9146, which is not interoperable with the draft-05 version.
If you need to communicate with peers that use earlier versions of
Mbed TLS, then you need to define MBEDTLS_SSL_DTLS_CONNECTION_ID_COMPAT
to 1, but then you won't be able to communicate with peers that use the
standard (non-draft) version.
If you need to interoperate with both classes of peers with the
same build of Mbed TLS, please let us know about your situation on the
mailing list or GitHub.
Requirement changes
* When building with PSA drivers using generate_driver_wrappers.py, or
when building the library from the development branch rather than
from a release, the Python module jsonschema is now necessary, in
addition to jinja2. The official list of required Python modules is
maintained in scripts/basic.requirements.txt and may change again
in the future.
New deprecations
* Deprecate mbedtls_asn1_free_named_data().
Use mbedtls_asn1_free_named_data_list()
or mbedtls_asn1_free_named_data_list_shallow().
Features
* Support rsa_pss_rsae_* signature algorithms in TLS 1.2.
* make: enable building unversioned shared library, with e.g.:
"SHARED=1 SOEXT_TLS=so SOEXT_X509=so SOEXT_CRYPTO=so make lib"
resulting in library names like "libmbedtls.so" rather than
"libmbedcrypto.so.11".
* Expose the EC J-PAKE functionality through the Draft PSA PAKE Crypto API.
Only the ECC primitive with secp256r1 curve and SHA-256 hash algorithm
are supported in this implementation.
* Some modules can now use PSA drivers for hashes, including with no
built-in implementation present, but only in some configurations.
- RSA OAEP and PSS (PKCS#1 v2.1), PKCS5, PKCS12 and EC J-PAKE now use
hashes from PSA when (and only when) MBEDTLS_MD_C is disabled.
- PEM parsing of encrypted files now uses MD-5 from PSA when (and only
when) MBEDTLS_MD5_C is disabled.
See the documentation of the corresponding macros in mbedtls_config.h for
details.
Note that some modules are not able to use hashes from PSA yet, including
the entropy module. As a consequence, for now the only way to build with
all hashes only provided by drivers (no built-in hash) is to use
MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG.
* When MBEDTLS_USE_PSA_CRYPTO is enabled, X.509, TLS 1.2 and TLS 1.3 now
properly negotiate/accept hashes based on their availability in PSA.
As a consequence, they now work in configurations where the built-in
implementations of (some) hashes are excluded and those hashes are only
provided by PSA drivers. (See previous entry for limitation on RSA-PSS
though: that module only use hashes from PSA when MBEDTLS_MD_C is off).
* Add support for opaque keys as the private keys associated to certificates
for authentication in TLS 1.3.
* Add the LMS post-quantum-safe stateful-hash asymmetric signature scheme.
Signature verification is production-ready, but generation is for testing
purposes only. This currently only supports one parameter set
(LMS_SHA256_M32_H10), meaning that each private key can be used to sign
1024 messages. As such, it is not intended for use in TLS, but instead
for verification of assets transmitted over an insecure channel,
particularly firmware images.
* Add the LM-OTS post-quantum-safe one-time signature scheme, which is
required for LMS. This can be used independently, but each key can only
be used to sign one message so is impractical for most circumstances.
* Mbed TLS now supports TLS 1.3 key establishment via pre-shared keys.
The pre-shared keys can be provisioned externally or via the ticket
mechanism (session resumption).
The ticket mechanism is supported when the configuration option
MBEDTLS_SSL_SESSION_TICKETS is enabled.
New options MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_xxx_ENABLED
control the support for the three possible TLS 1.3 key exchange modes.
* cert_write: support for setting extended key usage attributes. A
corresponding new public API call has been added in the library,
mbedtls_x509write_crt_set_ext_key_usage().
* cert_write: support for writing certificate files in either PEM
or DER format.
* The PSA driver wrapper generator generate_driver_wrappers.py now
supports a subset of the driver description language, including
the following entry points: import_key, export_key, export_public_key,
get_builtin_key, copy_key.
* The new functions mbedtls_asn1_free_named_data_list() and
mbedtls_asn1_free_named_data_list_shallow() simplify the management
of memory in named data lists in X.509 structures.
* The TLS 1.2 EC J-PAKE key exchange can now use the PSA Crypto API.
Additional PSA key slots will be allocated in the process of such key
exchange for builds that enable MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED and
MBEDTLS_USE_PSA_CRYPTO.
* Add support for DTLS Connection ID as defined by RFC 9146, controlled by
MBEDTLS_SSL_DTLS_CONNECTION_ID (enabled by default) and configured with
mbedtls_ssl_set_cid().
* Add a driver dispatch layer for raw key agreement, enabling alternative
implementations of raw key agreement through the key_agreement driver
entry point. This entry point is specified in the proposed PSA driver
interface, but had not yet been implemented.
* Add an ad-hoc key derivation function handling EC J-PAKE to PMS
calculation that can be used to derive the session secret in TLS 1.2,
as described in draft-cragie-tls-ecjpake-01. This can be achieved by
using PSA_ALG_TLS12_ECJPAKE_TO_PMS as the key derivation algorithm.
Security
* Fix potential heap buffer overread and overwrite in DTLS if
MBEDTLS_SSL_DTLS_CONNECTION_ID is enabled and
MBEDTLS_SSL_CID_IN_LEN_MAX > 2 * MBEDTLS_SSL_CID_OUT_LEN_MAX.
* Fix an issue where an adversary with access to precise enough information
about memory accesses (typically, an untrusted operating system attacking
a secure enclave) could recover an RSA private key after observing the
victim performing a single private-key operation if the window size used
for the exponentiation was 3 or smaller. Found and reported by Zili KOU,
Wenjian HE, Sharad Sinha, and Wei ZHANG. See "Cache Side-channel Attacks
and Defenses of the Sliding Window Algorithm in TEEs" - Design, Automation
and Test in Europe 2023.
Bugfix
* Refactor mbedtls_aes_context to support shallow-copying. Fixes #2147.
* Fix an issue with in-tree CMake builds in releases with GEN_FILES
turned off: if a shipped file was missing from the working directory,
it could be turned into a symbolic link to itself.
* Fix a long-standing build failure when building x86 PIC code with old
gcc (4.x). The code will be slower, but will compile. We do however
recommend upgrading to a more recent compiler instead. Fixes #1910.
* Fix support for little-endian Microblaze when MBEDTLS_HAVE_ASM is defined.
Contributed by Kazuyuki Kimura to fix #2020.
* Use double quotes to include private header file psa_crypto_cipher.h.
Fixes 'file not found with <angled> include' error
when building with Xcode.
* Fix handling of broken symlinks when loading certificates using
mbedtls_x509_crt_parse_path(). Instead of returning an error as soon as a
broken link is encountered, skip the broken link and continue parsing
other certificate files. Contributed by Eduardo Silva in #2602.
* Fix an interoperability failure between an Mbed TLS client with both
TLS 1.2 and TLS 1.3 support, and a TLS 1.2 server that supports
rsa_pss_rsae_* signature algorithms. This failed because Mbed TLS
advertised support for PSS in both TLS 1.2 and 1.3, but only
actually supported PSS in TLS 1.3.
* Fix a compilation error when using CMake with an IAR toolchain.
Fixes #5964.
* Fix a build error due to a missing prototype warning when
MBEDTLS_DEPRECATED_REMOVED is enabled.
* Fix mbedtls_ctr_drbg_free() on an initialized but unseeded context. When
MBEDTLS_AES_ALT is enabled, it could call mbedtls_aes_free() on an
uninitialized context.
* Fix a build issue on Windows using CMake where the source and build
directories could not be on different drives. Fixes #5751.
* Fix bugs and missing dependencies when building and testing
configurations with only one encryption type enabled in TLS 1.2.
* Provide the missing definition of mbedtls_setbuf() in some configurations
with MBEDTLS_PLATFORM_C disabled. Fixes #6118, #6196.
* Fix compilation errors when trying to build with
PSA drivers for AEAD (GCM, CCM, Chacha20-Poly1305).
* Fix memory leak in ssl_parse_certificate_request() caused by
mbedtls_x509_get_name() not freeing allocated objects in case of error.
Change mbedtls_x509_get_name() to clean up allocated objects on error.
* Fix build failure with MBEDTLS_RSA_C and MBEDTLS_PSA_CRYPTO_C but not
MBEDTLS_USE_PSA_CRYPTO or MBEDTLS_PK_WRITE_C. Fixes #6408.
* Fix build failure with MBEDTLS_RSA_C and MBEDTLS_PSA_CRYPTO_C but not
MBEDTLS_PK_PARSE_C. Fixes #6409.
* Fix ECDSA verification, where it was not always validating the
public key. This bug meant that it was possible to verify a
signature with an invalid public key, in some cases. Reported by
Guido Vranken using Cryptofuzz in #4420.
* Fix a possible null pointer dereference if a memory allocation fails
in TLS PRF code. Reported by Michael Madsen in #6516.
* Fix TLS 1.3 session resumption. Fixes #6488.
* Add a configuration check to exclude optional client authentication
in TLS 1.3 (where it is forbidden).
* Fix a bug in which mbedtls_x509_crt_info() would produce non-printable
bytes when parsing certificates containing a binary RFC 4108
HardwareModuleName as a Subject Alternative Name extension. Hardware
serial numbers are now rendered in hex format. Fixes #6262.
* Fix bug in error reporting in dh_genprime.c where upon failure,
the error code returned by mbedtls_mpi_write_file() is overwritten
and therefore not printed.
* In the bignum module, operations of the form (-A) - (+A) or (-A) - (-A)
with A > 0 created an unintended representation of the value 0 which was
not processed correctly by some bignum operations. Fix this. This had no
consequence on cryptography code, but might affect applications that call
bignum directly and use negative numbers.
* Fix a bug whereby the list of signature algorithms sent as part of
the TLS 1.2 server certificate request would get corrupted, meaning the
first algorithm would not get sent and an entry consisting of two random
bytes would be sent instead. Found by Serban Bejan and Dudek Sebastian.
* Fix undefined behavior (typically harmless in practice) of
mbedtls_mpi_add_mpi(), mbedtls_mpi_add_abs() and mbedtls_mpi_add_int()
when both operands are 0 and the left operand is represented with 0 limbs.
* Fix undefined behavior (typically harmless in practice) when some bignum
functions receive the most negative value of mbedtls_mpi_sint. Credit
to OSS-Fuzz. Fixes #6597.
* Fix undefined behavior (typically harmless in practice) in PSA ECB
encryption and decryption.
* Move some SSL-specific code out of libmbedcrypto where it had been placed
accidentally.
* Fix a build error when compiling the bignum module for some Arm platforms.
Fixes #6089, #6124, #6217.
Changes
* Add the ability to query PSA_WANT_xxx macros to query_compile_time_config.
* Calling AEAD tag-specific functions for non-AEAD algorithms (which
should not be done - they are documented for use only by AES-GCM and
ChaCha20+Poly1305) now returns MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE
instead of success (0).
= Mbed TLS 3.2.1 branch released 2022-07-12
Bugfix
* Re-add missing generated file library/psa_crypto_driver_wrappers.c
= Mbed TLS 3.2.0 branch released 2022-07-11
Default behavior changes
* mbedtls_cipher_set_iv will now fail with ChaCha20 and ChaCha20+Poly1305
for IV lengths other than 12. The library was silently overwriting this
length with 12, but did not inform the caller about it. Fixes #4301.
Requirement changes
* The library will no longer compile out of the box on a platform without
setbuf(). If your platform does not have setbuf(), you can configure an
alternative function by enabling MBEDTLS_PLATFORM_SETBUF_ALT or
MBEDTLS_PLATFORM_SETBUF_MACRO.
New deprecations
* Deprecate mbedtls_ssl_conf_max_version() and
mbedtls_ssl_conf_min_version() in favor of
mbedtls_ssl_conf_max_tls_version() and
mbedtls_ssl_conf_min_tls_version().
* Deprecate mbedtls_cipher_setup_psa(). Use psa_aead_xxx() or
psa_cipher_xxx() directly instead.
* Secure element drivers enabled by MBEDTLS_PSA_CRYPTO_SE_C are deprecated.
This was intended as an experimental feature, but had not been explicitly
documented as such. Use opaque drivers with the interface enabled by
MBEDTLS_PSA_CRYPTO_DRIVERS instead.
* Deprecate mbedtls_ssl_conf_sig_hashes() in favor of the more generic
mbedtls_ssl_conf_sig_algs(). Signature algorithms for the TLS 1.2 and
TLS 1.3 handshake should now be configured with
mbedtls_ssl_conf_sig_algs().
Features
* Add accessor to obtain ciphersuite id from ssl context.
* Add accessors to get members from ciphersuite info.
* Add mbedtls_ssl_ticket_rotate() for external ticket rotation.
* Add accessor to get the raw buffer pointer from a PEM context.
* The structures mbedtls_ssl_config and mbedtls_ssl_context now store
a piece of user data which is reserved for the application. The user
data can be either a pointer or an integer.
* Add an accessor function to get the configuration associated with
an SSL context.
* Add a function to access the protocol version from an SSL context in a
form that's easy to compare. Fixes #5407.
* Add function mbedtls_md_info_from_ctx() to recall the message digest
information that was used to set up a message digest context.
* Add ALPN support in TLS 1.3 clients.
* Add server certificate selection callback near end of Client Hello.
Register callback with mbedtls_ssl_conf_cert_cb().
* Provide mechanism to reset handshake cert list by calling
mbedtls_ssl_set_hs_own_cert() with NULL value for own_cert param.
* Add accessor mbedtls_ssl_get_hs_sni() to retrieve SNI from within
cert callback (mbedtls_ssl_conf_cert_cb()) during handshake.
* The X.509 module now uses PSA hash acceleration if present.
* Add support for psa crypto key derivation for elliptic curve
keys. Fixes #3260.
* Add function mbedtls_timing_get_final_delay() to access the private
final delay field in an mbedtls_timing_delay_context, as requested in
#5183.
* Add mbedtls_pk_sign_ext() which allows generating RSA-PSS signatures when
PSA Crypto is enabled.
* Add function mbedtls_ecp_export() to export ECP key pair parameters.
Fixes #4838.
* Add function mbedtls_ssl_is_handshake_over() to enable querying if the SSL
Handshake has completed or not, and thus whether to continue calling
mbedtls_ssl_handshake_step(), requested in #4383.
* Add the function mbedtls_ssl_get_own_cid() to access our own connection id
within mbedtls_ssl_context, as requested in #5184.
* Introduce mbedtls_ssl_hs_cb_t typedef for use with
mbedtls_ssl_conf_cert_cb() and perhaps future callbacks
during TLS handshake.
* Add functions mbedtls_ssl_conf_max_tls_version() and
mbedtls_ssl_conf_min_tls_version() that use a single value to specify
the protocol version.
* Extend the existing PSA_ALG_TLS12_PSK_TO_MS() algorithm to support
mixed-PSK. Add an optional input PSA_KEY_DERIVATION_INPUT_OTHER_SECRET
holding the other secret.
* When MBEDTLS_PSA_CRYPTO_CONFIG is enabled, you may list the PSA crypto
feature requirements in the file named by the new macro
MBEDTLS_PSA_CRYPTO_CONFIG_FILE instead of the default psa/crypto_config.h.
Furthermore you may name an additional file to include after the main
file with the macro MBEDTLS_PSA_CRYPTO_USER_CONFIG_FILE.
* Add the function mbedtls_x509_crt_has_ext_type() to access the ext types
field within mbedtls_x509_crt context, as requested in #5585.
* Add HKDF-Expand and HKDF-Extract as separate algorithms in the PSA API.
* Add support for the ARMv8 SHA-2 acceleration instructions when building
for Aarch64.
* Add support for authentication of TLS 1.3 clients by TLS 1.3 servers.
* Add support for server HelloRetryRequest message. The TLS 1.3 client is
now capable of negotiating another shared secret if the one sent in its
first ClientHello was not suitable to the server.
* Add support for client-side TLS version negotiation. If both TLS 1.2 and
TLS 1.3 protocols are enabled in the build of Mbed TLS, the TLS client now
negotiates TLS 1.3 or TLS 1.2 with TLS servers.
* Enable building of Mbed TLS with TLS 1.3 protocol support but without TLS
1.2 protocol support.
* Mbed TLS provides an implementation of a TLS 1.3 server (ephemeral key
establishment only). See docs/architecture/tls13-support.md for a
description of the support. The MBEDTLS_SSL_PROTO_TLS1_3 and
MBEDTLS_SSL_SRV_C configuration options control this.
* Add accessors to configure DN hints for certificate request:
mbedtls_ssl_conf_dn_hints() and mbedtls_ssl_set_hs_dn_hints()
* The configuration option MBEDTLS_USE_PSA_CRYPTO, which previously
affected only a limited subset of crypto operations in TLS, X.509 and PK,
now causes most of them to be done using PSA Crypto; see
docs/use-psa-crypto.md for the list of exceptions.
* The function mbedtls_pk_setup_opaque() now supports RSA key pairs as well.
Opaque keys can now be used everywhere a private key is expected in the
TLS and X.509 modules.
* Opaque pre-shared keys for TLS, provisioned with
mbedtls_ssl_conf_psk_opaque() or mbedtls_ssl_set_hs_psk_opaque(), which
previously only worked for "pure" PSK key exchange, now can also be used
for the "mixed" PSK key exchanges as well: ECDHE-PSK, DHE-PSK, RSA-PSK.
* cmake now detects if it is being built as a sub-project, and in that case
disables the target export/installation and package configuration.
* Make USE_PSA_CRYPTO compatible with KEY_ID_ENCODES_OWNER. Fixes #5259.
* Add example programs cipher_aead_demo.c, md_hmac_demo.c, aead_demo.c
and hmac_demo.c, which use PSA and the md/cipher interfaces side
by side in order to illustrate how the operation is performed in PSA.
Addresses #5208.
Security
* Zeroize dynamically-allocated buffers used by the PSA Crypto key storage
module before freeing them. These buffers contain secret key material, and
could thus potentially leak the key through freed heap.
* Fix potential memory leak inside mbedtls_ssl_cache_set() with
an invalid session id length.
* Add the platform function mbedtls_setbuf() to allow buffering to be
disabled on stdio files, to stop secrets loaded from said files being
potentially left in memory after file operations. Reported by
Glenn Strauss.
* Fix a potential heap buffer overread in TLS 1.2 server-side when
MBEDTLS_USE_PSA_CRYPTO is enabled, an opaque key (created with
mbedtls_pk_setup_opaque()) is provisioned, and a static ECDH ciphersuite
is selected. This may result in an application crash or potentially an
information leak.
* Fix a buffer overread in DTLS ClientHello parsing in servers with
MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled. An unauthenticated client
or a man-in-the-middle could cause a DTLS server to read up to 255 bytes
after the end of the SSL input buffer. The buffer overread only happens
when MBEDTLS_SSL_IN_CONTENT_LEN is less than a threshold that depends on
the exact configuration: 258 bytes if using mbedtls_ssl_cookie_check(),
and possibly up to 571 bytes with a custom cookie check function.
Reported by the Cybeats PSI Team.
* Fix a buffer overread in TLS 1.3 Certificate parsing. An unauthenticated
client or server could cause an MbedTLS server or client to overread up
to 64 kBytes of data and potentially overread the input buffer by that
amount minus the size of the input buffer. As overread data undergoes
various checks, the likelihood of reaching the boundary of the input
buffer is rather small but increases as its size
MBEDTLS_SSL_IN_CONTENT_LEN decreases.
* Fix check of certificate key usage in TLS 1.3. The usage of the public key
provided by a client or server certificate for authentication was not
checked properly when validating the certificate. This could cause a
client or server to be able to authenticate itself through a certificate
to an Mbed TLS TLS 1.3 server or client while it does not own a proper
certificate to do so.
Bugfix
* Declare or use PSA_WANT_ALG_CCM_STAR_NO_TAG following the general
pattern for PSA_WANT_xxx symbols. Previously you had to specify
PSA_WANT_ALG_CCM for PSA_ALG_CCM_STAR_NO_TAG.
* Fix a memory leak if mbedtls_ssl_config_defaults() is called twice.
* Fixed swap of client and server random bytes when exporting them alongside
TLS 1.3 handshake and application traffic secret.
* Fix several bugs (warnings, compiler and linker errors, test failures)
in reduced configurations when MBEDTLS_USE_PSA_CRYPTO is enabled.
* Fix a bug in (D)TLS curve negotiation: when MBEDTLS_USE_PSA_CRYPTO was
enabled and an ECDHE-ECDSA or ECDHE-RSA key exchange was used, the
client would fail to check that the curve selected by the server for
ECDHE was indeed one that was offered. As a result, the client would
accept any curve that it supported, even if that curve was not allowed
according to its configuration. Fixes #5291.
* The TLS 1.3 implementation is now compatible with the
MBEDTLS_USE_PSA_CRYPTO configuration option.
* Fix unit tests that used 0 as the file UID. This failed on some
implementations of PSA ITS. Fixes #3838.
* Fix mbedtls_ssl_get_version() not reporting TLSv1.3. Fixes #5406.
* Fix API violation in mbedtls_md_process() test by adding a call to
mbedtls_md_starts(). Fixes #2227.
* Fix compile errors when MBEDTLS_HAVE_TIME is not defined. Add tests
to catch bad uses of time.h.
* Fix a race condition in out-of-source builds with CMake when generated data
files are already present. Fixes #5374.
* Fix the library search path when building a shared library with CMake
on Windows.
* Fix bug in the alert sending function mbedtls_ssl_send_alert_message()
potentially leading to corrupted alert messages being sent in case
the function needs to be re-called after initially returning
MBEDTLS_SSL_WANT_WRITE. Fixes #1916.
* In configurations with MBEDTLS_SSL_DTLS_CONNECTION_ID enabled but not
MBEDTLS_DEBUG_C, DTLS handshakes using CID would crash due to a null
pointer dereference. Fix this. Fixes #3998.
The fix was released, but not announced, in Mbed TLS 3.1.0.
* Fix incorrect documentation of mbedtls_x509_crt_profile. The previous
documentation stated that the `allowed_pks` field applies to signatures
only, but in fact it does apply to the public key type of the end entity
certificate, too. Fixes #1992.
* Fix undefined behavior in mbedtls_asn1_find_named_data(), where val is
not NULL and val_len is zero.
* Fix compilation error with mingw32. Fixed by Cameron Cawley in #4211.
* Fix compilation error when using C++ Builder on Windows. Reported by
Miroslav Mastny in #4015.
* psa_raw_key_agreement() now returns PSA_ERROR_BUFFER_TOO_SMALL when
applicable. Fixes #5735.
* Fix a bug in the x25519 example program where the removal of
MBEDTLS_ECDH_LEGACY_CONTEXT caused the program not to run. Fixes #4901 and
#3191.
* Fix a TLS 1.3 handshake failure when the peer Finished message has not
been received yet when we first try to fetch it.
* Encode X.509 dates before 1/1/2000 as UTCTime rather than
GeneralizedTime. Fixes #5465.
* Add mbedtls_x509_dn_get_next function to return the next relative DN in
an X509 name, to allow walking the name list. Fixes #5431.
* Fix order value of curve x448.
* Fix string representation of DNs when outputting values containing commas
and other special characters, conforming to RFC 1779. Fixes #769.
* Silence a warning from GCC 12 in the selftest program. Fixes #5974.
* Fix check_config.h to check that we have MBEDTLS_SSL_KEEP_PEER_CERTIFICATE
when MBEDTLS_SSL_PROTO_TLS1_3 is specified, and make this and other
dependencies explicit in the documentation. Fixes #5610.
* Fix mbedtls_asn1_write_mpi() writing an incorrect encoding of 0.
* Fix a TLS 1.3 handshake failure when the first attempt to send the client
Finished message on the network cannot be satisfied. Fixes #5499.
* Fix resource leaks in mbedtls_pk_parse_public_key() in low
memory conditions.
* Fix server connection identifier setting for outgoing encrypted records
on DTLS 1.2 session resumption. After DTLS 1.2 session resumption with
connection identifier, the Mbed TLS client now properly sends the server
connection identifier in encrypted record headers. Fix #5872.
* Fix a null pointer dereference when performing some operations on zero
represented with 0 limbs (specifically mbedtls_mpi_mod_int() dividing
by 2, and mbedtls_mpi_write_string() in base 2).
* Fix record sizes larger than 16384 being sometimes accepted despite being
non-compliant. This could not lead to a buffer overflow. In particular,
application data size was already checked correctly.
* Fix MBEDTLS_SVC_KEY_ID_GET_KEY_ID() and MBEDTLS_SVC_KEY_ID_GET_OWNER_ID()
which have been broken, resulting in compilation errors, since Mbed TLS
3.0.
* Ensure that TLS 1.2 ciphersuite/certificate and key selection takes into
account not just the type of the key (RSA vs EC) but also what it can
actually do. Resolves #5831.
* Fix CMake windows host detection, especially when cross compiling.
* Fix an error in make where the absence of a generated file caused
make to break on a clean checkout. Fixes #5340.
* Work around an MSVC ARM64 compiler bug causing incorrect behaviour
in mbedtls_mpi_exp_mod(). Reported by Tautvydas Žilys in #5467.
* Removed the prompt to exit from all windows build programs, which was causing
issues in CI/CD environments.
Changes
* The file library/psa_crypto_driver_wrappers.c is now generated
from a template. In the future, the generation will support
driver descriptions. For the time being, to customize this file,
see docs/proposed/psa-driver-wrappers-codegen-migration-guide.md
* Return PSA_ERROR_INVALID_ARGUMENT if the algorithm passed to one-shot
AEAD functions is not an AEAD algorithm. This aligns them with the
multipart functions, and the PSA Crypto API 1.1 specification.
* In mbedtls_pk_parse_key(), if no password is provided, don't allocate a
temporary variable on the heap. Suggested by Sergey Kanatov in #5304.
* Assume source files are in UTF-8 when using MSVC with CMake.
* Fix runtime library install location when building with CMake and MinGW.
DLLs are now installed in the bin directory instead of lib.
* cmake: Use GnuInstallDirs to customize install directories
Replace custom LIB_INSTALL_DIR variable with standard CMAKE_INSTALL_LIBDIR
variable. For backward compatibility, set CMAKE_INSTALL_LIBDIR if
LIB_INSTALL_DIR is set.
* Add a CMake option that enables static linking of the runtime library
in Microsoft Visual C++ compiler. Contributed by Microplankton.
* In CMake builds, add aliases for libraries so that the normal MbedTLS::*
targets work when MbedTLS is built as a subdirectory. This allows the
use of FetchContent, as requested in #5688.
= mbed TLS 3.1.0 branch released 2021-12-17
API changes
* New error code for GCM: MBEDTLS_ERR_GCM_BUFFER_TOO_SMALL.
Alternative GCM implementations are expected to verify
the length of the provided output buffers and to return the
MBEDTLS_ERR_GCM_BUFFER_TOO_SMALL in case the buffer length is too small.
* You can configure groups for a TLS key exchange with the new function
mbedtls_ssl_conf_groups(). It extends mbedtls_ssl_conf_curves().
* Declare a number of structure fields as public: the fields of
mbedtls_ecp_curve_info, the fields describing the result of ASN.1 and
X.509 parsing, and finally the field fd of mbedtls_net_context on
POSIX/Unix-like platforms.
Requirement changes
* Sign-magnitude and one's complement representations for signed integers are
not supported. Two's complement is the only supported representation.
New deprecations
* Deprecate mbedtls_ssl_conf_curves() in favor of the more generic
mbedtls_ssl_conf_groups().
Removals
* Remove the partial support for running unit tests via Greentea on Mbed OS,
which had been unmaintained since 2018.
Features
* Enable support for Curve448 via the PSA API. Contributed by
Archana Madhavan in #4626. Fixes #3399 and #4249.
* The identifier of the CID TLS extension can be configured by defining
MBEDTLS_TLS_EXT_CID at compile time.
* Implement the PSA multipart AEAD interface, currently supporting
ChaChaPoly and GCM.
* Warn if errors from certain functions are ignored. This is currently
supported on GCC-like compilers and on MSVC and can be configured through
the macro MBEDTLS_CHECK_RETURN. The warnings are always enabled
(where supported) for critical functions where ignoring the return
value is almost always a bug. Enable the new configuration option
MBEDTLS_CHECK_RETURN_WARNING to get warnings for other functions. This
is currently implemented in the AES, DES and md modules, and will be
extended to other modules in the future.
* Add missing PSA macros declared by PSA Crypto API 1.0.0:
PSA_ALG_IS_SIGN_HASH, PSA_ALG_NONE, PSA_HASH_BLOCK_LENGTH, PSA_KEY_ID_NULL.
* Add support for CCM*-no-tag cipher to the PSA.
Currently only 13-byte long IV's are supported.
For decryption a minimum of 16-byte long input is expected.
These restrictions may be subject to change.
* Add new API mbedtls_ct_memcmp for constant time buffer comparison.
* Add functions to get the IV and block size from cipher_info structs.
* Add functions to check if a cipher supports variable IV or key size.
* Add the internal implementation of and support for CCM to the PSA multipart
AEAD interface.
* Mbed TLS provides a minimum viable implementation of the TLS 1.3
protocol. See docs/architecture/tls13-support.md for the definition of
the TLS 1.3 Minimum Viable Product (MVP). The MBEDTLS_SSL_PROTO_TLS1_3
configuration option controls the enablement of the support. The APIs
mbedtls_ssl_conf_min_version() and mbedtls_ssl_conf_max_version() allow
to select the 1.3 version of the protocol to establish a TLS connection.
* Add PSA API definition for ARIA.
Security
* Zeroize several intermediate variables used to calculate the expected
value when verifying a MAC or AEAD tag. This hardens the library in
case the value leaks through a memory disclosure vulnerability. For
example, a memory disclosure vulnerability could have allowed a
man-in-the-middle to inject fake ciphertext into a DTLS connection.
* In psa_aead_generate_nonce(), do not read back from the output buffer.
This fixes a potential policy bypass or decryption oracle vulnerability
if the output buffer is in memory that is shared with an untrusted
application.
* In psa_cipher_generate_iv() and psa_cipher_encrypt(), do not read back
from the output buffer. This fixes a potential policy bypass or decryption
oracle vulnerability if the output buffer is in memory that is shared with
an untrusted application.
* Fix a double-free that happened after mbedtls_ssl_set_session() or
mbedtls_ssl_get_session() failed with MBEDTLS_ERR_SSL_ALLOC_FAILED
(out of memory). After that, calling mbedtls_ssl_session_free()
and mbedtls_ssl_free() would cause an internal session buffer to
be free()'d twice.
Bugfix
* Stop using reserved identifiers as local variables. Fixes #4630.
* The GNU makefiles invoke python3 in preference to python except on Windows.
The check was accidentally not performed when cross-compiling for Windows
on Linux. Fix this. Fixes #4774.
* Prevent divide by zero if either of PSA_CIPHER_ENCRYPT_OUTPUT_SIZE() or
PSA_CIPHER_UPDATE_OUTPUT_SIZE() were called using an asymmetric key type.
* Fix a parameter set but unused in psa_crypto_cipher.c. Fixes #4935.
* Don't use the obsolete header path sys/fcntl.h in unit tests.
These header files cause compilation errors in musl.
Fixes #4969.
* Fix missing constraints on x86_64 and aarch64 assembly code
for bignum multiplication that broke some bignum operations with
(at least) Clang 12.
Fixes #4116, #4786, #4917, #4962.
* Fix mbedtls_cipher_crypt: AES-ECB when MBEDTLS_USE_PSA_CRYPTO is enabled.
* Failures of alternative implementations of AES or DES single-block
functions enabled with MBEDTLS_AES_ENCRYPT_ALT, MBEDTLS_AES_DECRYPT_ALT,
MBEDTLS_DES_CRYPT_ECB_ALT or MBEDTLS_DES3_CRYPT_ECB_ALT were ignored.
This does not concern the implementation provided with Mbed TLS,
where this function cannot fail, or full-module replacements with
MBEDTLS_AES_ALT or MBEDTLS_DES_ALT. Reported by Armelle Duboc in #1092.
* Some failures of HMAC operations were ignored. These failures could only
happen with an alternative implementation of the underlying hash module.
* Fix the error returned by psa_generate_key() for a public key. Fixes #4551.
* Fix compile-time or run-time errors in PSA
AEAD functions when ChachaPoly is disabled. Fixes #5065.
* Remove PSA'a AEAD finish/verify output buffer limitation for GCM.
The requirement of minimum 15 bytes for output buffer in
psa_aead_finish() and psa_aead_verify() does not apply to the built-in
implementation of GCM.
* Move GCM's update output buffer length verification from PSA AEAD to
the built-in implementation of the GCM.
The requirement for output buffer size to be equal or greater then
input buffer size is valid only for the built-in implementation of GCM.
Alternative GCM implementations can process whole blocks only.
* Fix the build of sample programs when neither MBEDTLS_ERROR_C nor
MBEDTLS_ERROR_STRERROR_DUMMY is enabled.
* Fix PSA_ALG_RSA_PSS verification accepting an arbitrary salt length.
This algorithm now accepts only the same salt length for verification
that it produces when signing, as documented. Use the new algorithm
PSA_ALG_RSA_PSS_ANY_SALT to accept any salt length. Fixes #4946.
* The existing predicate macro name PSA_ALG_IS_HASH_AND_SIGN is now reserved
for algorithm values that fully encode the hashing step, as per the PSA
Crypto API specification. This excludes PSA_ALG_RSA_PKCS1V15_SIGN_RAW and
PSA_ALG_ECDSA_ANY. The new predicate macro PSA_ALG_IS_SIGN_HASH covers
all algorithms that can be used with psa_{sign,verify}_hash(), including
these two.
* Fix issue in Makefile on Linux with SHARED=1, that caused shared libraries
not to list other shared libraries they need.
* Fix a bug in mbedtls_gcm_starts() when the bit length of the iv
exceeds 2^32. Fixes #4884.
* Fix an uninitialized variable warning in test_suite_ssl.function with GCC
version 11.
* Fix the build when no SHA2 module is included. Fixes #4930.
* Fix the build when only the bignum module is included. Fixes #4929.
* Fix a potential invalid pointer dereference and infinite loop bugs in
pkcs12 functions when the password is empty. Fix the documentation to
better describe the inputs to these functions and their possible values.
Fixes #5136.
* The key usage flags PSA_KEY_USAGE_SIGN_MESSAGE now allows the MAC
operations psa_mac_compute() and psa_mac_sign_setup().
* The key usage flags PSA_KEY_USAGE_VERIFY_MESSAGE now allows the MAC
operations psa_mac_verify() and psa_mac_verify_setup().
Changes
* Explicitly mark the fields mbedtls_ssl_session.exported and
mbedtls_ssl_config.respect_cli_pref as private. This was an
oversight during the run-up to the release of Mbed TLS 3.0.
The fields were never intended to be public.
* Implement multi-part CCM API.
The multi-part functions: mbedtls_ccm_starts(), mbedtls_ccm_set_lengths(),
mbedtls_ccm_update_ad(), mbedtls_ccm_update(), mbedtls_ccm_finish()
were introduced in mbedTLS 3.0 release, however their implementation was
postponed until now.
Implemented functions support chunked data input for both CCM and CCM*
algorithms.
* Remove MBEDTLS_SSL_EXPORT_KEYS, making it always on and increasing the
code size by about 80B on an M0 build. This option only gated an ability
to set a callback, but was deemed unnecessary as it was yet another define
to remember when writing tests, or test configurations. Fixes #4653.
* Improve the performance of base64 constant-flow code. The result is still
slower than the original non-constant-flow implementation, but much faster
than the previous constant-flow implementation. Fixes #4814.
* Ignore plaintext/ciphertext lengths for CCM*-no-tag operations.
For CCM* encryption/decryption without authentication, input
length will be ignored.
* Indicate in the error returned if the nonce length used with
ChaCha20-Poly1305 is invalid, and not just unsupported.
* The mbedcrypto library includes a new source code module constant_time.c,
containing various functions meant to resist timing side channel attacks.
This module does not have a separate configuration option, and functions
from this module will be included in the build as required. Currently
most of the interface of this module is private and may change at any
time.
* The generated configuration-independent files are now automatically
generated by the CMake build system on Unix-like systems. This is not
yet supported when cross-compiling.
= Mbed TLS 3.0.0 branch released 2021-07-07
API changes
* Remove HAVEGE module.
The design of HAVEGE makes it unsuitable for microcontrollers. Platforms
with a more complex CPU usually have an operating system interface that
provides better randomness. Instead of HAVEGE, declare OS or hardware RNG
interfaces with mbedtls_entropy_add_source() and/or use an entropy seed
file created securely during device provisioning. See
https://mbed-tls.readthedocs.io/en/latest/kb/how-to/add-entropy-sources-to-entropy-pool/ for
more information.
* Add missing const attributes to API functions.
* Remove helpers for the transition from Mbed TLS 1.3 to Mbed TLS 2.0: the
header compat-1.3.h and the script rename.pl.
* Remove certs module from the API.
Transfer keys and certificates embedded in the library to the test
component. This contributes to minimizing library API and discourages
users from using unsafe keys in production.
* Move alt helpers and definitions.
Various helpers and definitions available for use in alt implementations
have been moved out of the include/ directory and into the library/
directory. The files concerned are ecp_internal.h and rsa_internal.h
which have also been renamed to ecp_internal_alt.h and rsa_alt_helpers.h
respectively.
* Move internal headers.
Header files that were only meant for the library's internal use and
were not meant to be used in application code have been moved out of
the include/ directory. The headers concerned are bn_mul.h, aesni.h,
padlock.h, entropy_poll.h and *_internal.h.
* Drop support for parsing SSLv2 ClientHello
(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO).
* Drop support for SSLv3 (MBEDTLS_SSL_PROTO_SSL3).
* Drop support for TLS record-level compression (MBEDTLS_ZLIB_SUPPORT).
* Drop support for RC4 TLS ciphersuites.
* Drop support for single-DES ciphersuites.
* Drop support for MBEDTLS_SSL_HW_RECORD_ACCEL.
* Update AEAD output size macros to bring them in line with the PSA Crypto
API version 1.0 spec. This version of the spec parameterizes them on the
key type used, as well as the key bit-size in the case of
PSA_AEAD_TAG_LENGTH.
* Add configuration option MBEDTLS_X509_REMOVE_INFO which
removes the mbedtls_x509_*_info(), mbedtls_debug_print_crt()
as well as other functions and constants only used by
those functions. This reduces the code footprint by
several kB.
* Remove SSL error codes `MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED`
and `MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH` which are never
returned from the public SSL API.
* Remove `MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE` and return
`MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL` instead.
* The output parameter of mbedtls_sha512_finish, mbedtls_sha512,
mbedtls_sha256_finish and mbedtls_sha256 now has a pointer type
rather than array type. This removes spurious warnings in some compilers
when outputting a SHA-384 or SHA-224 hash into a buffer of exactly
the hash size.
* Remove the MBEDTLS_TEST_NULL_ENTROPY config option. Fixes #4388.
* The interface of the GCM module has changed to remove restrictions on
how the input to multipart operations is broken down. mbedtls_gcm_finish()
now takes extra output parameters for the last partial output block.
mbedtls_gcm_update() now takes extra parameters for the output length.
The software implementation always produces the full output at each
call to mbedtls_gcm_update(), but alternative implementations activated
by MBEDTLS_GCM_ALT may delay partial blocks to the next call to
mbedtls_gcm_update() or mbedtls_gcm_finish(). Furthermore, applications
no longer pass the associated data to mbedtls_gcm_starts(), but to the
new function mbedtls_gcm_update_ad().
These changes are backward compatible for users of the cipher API.
* Replace MBEDTLS_SHA512_NO_SHA384 config option with MBEDTLS_SHA384_C.
This separates config option enabling the SHA384 algorithm from option
enabling the SHA512 algorithm. Fixes #4034.
* Introduce MBEDTLS_SHA224_C.
This separates config option enabling the SHA224 algorithm from option
enabling SHA256.
* The getter and setter API of the SSL session cache (used for
session-ID based session resumption) has changed to that of
a key-value store with keys being session IDs and values
being opaque instances of `mbedtls_ssl_session`.
* Remove the mode parameter from RSA operation functions. Signature and
decryption functions now always use the private key and verification and
encryption use the public key. Verification functions also no longer have
RNG parameters.
* Modify semantics of `mbedtls_ssl_conf_[opaque_]psk()`:
In Mbed TLS 2.X, the API prescribes that later calls overwrite
the effect of earlier calls. In Mbed TLS 3.0, calling
`mbedtls_ssl_conf_[opaque_]psk()` more than once will fail,
leaving the PSK that was configured first intact.
Support for more than one PSK may be added in 3.X.
* The function mbedtls_x509write_csr_set_extension() has an extra parameter
which allows to mark an extension as critical. Fixes #4055.
* For multi-part AEAD operations with the cipher module, calling
mbedtls_cipher_finish() is now mandatory. Previously the documentation
was unclear on this point, and this function happened to never do
anything with the currently implemented AEADs, so in practice it was
possible to skip calling it, which is no longer supported.
* The option MBEDTLS_ECP_FIXED_POINT_OPTIM use pre-computed comb tables
instead of computing tables in runtime. Thus, this option now increase
code size, and it does not increase RAM usage in runtime anymore.
* Remove the SSL APIs mbedtls_ssl_get_input_max_frag_len() and
mbedtls_ssl_get_output_max_frag_len(), and add a new API
mbedtls_ssl_get_max_in_record_payload(), complementing the existing
mbedtls_ssl_get_max_out_record_payload().
Uses of mbedtls_ssl_get_input_max_frag_len() and
mbedtls_ssl_get_input_max_frag_len() should be replaced by
mbedtls_ssl_get_max_in_record_payload() and
mbedtls_ssl_get_max_out_record_payload(), respectively.
* mbedtls_rsa_init() now always selects the PKCS#1v1.5 encoding for an RSA
key. To use an RSA key with PSS or OAEP, call mbedtls_rsa_set_padding()
after initializing the context. mbedtls_rsa_set_padding() now returns an
error if its parameters are invalid.
* Replace MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE by a runtime
configuration function mbedtls_ssl_conf_preference_order(). Fixes #4398.
* Instead of accessing the len field of a DHM context, which is no longer
supported, use the new function mbedtls_dhm_get_len() .
* In modules that implement cryptographic hash functions, many functions
mbedtls_xxx() now return int instead of void, and the corresponding
function mbedtls_xxx_ret() which was identical except for returning int
has been removed. This also concerns mbedtls_xxx_drbg_update(). See the
migration guide for more information. Fixes #4212.
* For all functions that take a random number generator (RNG) as a
parameter, this parameter is now mandatory (that is, NULL is not an
acceptable value). Functions which previously accepted NULL and now
reject it are: the X.509 CRT and CSR writing functions; the PK and RSA
sign and decrypt function; mbedtls_rsa_private(); the functions
in DHM and ECDH that compute the shared secret; the scalar multiplication
functions in ECP.
* The following functions now require an RNG parameter:
mbedtls_ecp_check_pub_priv(), mbedtls_pk_check_pair(),
mbedtls_pk_parse_key(), mbedtls_pk_parse_keyfile().
* mbedtls_ssl_conf_export_keys_ext_cb() and