PKCS5 depends on MD, but is missing a config check resulting in
obscure errors on invalid configurations.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
At the end of the benchmark program, heap stats are printed, and these
stats will be wrong if we reset counters in the middle.
Also remove the function to reset counters, in order to encourage other
programs to behave correctly as well.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
Fix library references, tests and programs.
Testing is performed in the already present all.sh test.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
Declare mbedtls_md functions as MBEDTLS_CHECK_RETURN_TYPICAL, meaning that
their return values should be checked.
Do check the return values in our code. We were already doing that
everywhere for hash calculations, but not for HMAC calculations.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
As we have now a minimal viable implementation of TLS 1.3,
let's remove EXPERIMENTAL from the config option enabling
it.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Ensure that the documentation of fields affected by
"mbedtls_ssl_config: Replace bit-fields by separate bytes"
conveys information that may have been lost by removing the exact size of
the type. Extend the preexisting pattern "do this?" for formerly 1-bit
boolean fields. Indicate the possible values for non-boolean fields.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Change the wording of the documentation for some CMAC functions,
as the existing wording, while technically correct, can be
easy to misunderstand. The reworded docs explain the flow of
a CMAC computation a little more fully.
Signed-off-by: David Horstmann <david.horstmann@arm.com>
Use PSA_BUILTIN macros instead of the Mbed TLS ones
as in the hash operation contexts the context for a
given hash is needed only if the support for it
through PSA is enabled.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit removes the test_psa_crypto_config_basic
all.sh component that can no longer work without
adapting it to the separately compiled test driver
library. This component is replaced by several
components in the following commits to test various
type of acceleration independently.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
The PSA max hash size has to be 64 if SHA512 or
SHA384 is supported by the library or an
accelerator, not just in case of the library.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
static function mbedtls_set_key_owner() is declared in psa/crypto.h
and defined in psa/crypto_struct.h with different parameter name for
the mbedtls_key_owner_id_t parameter and that may trigger errors
from static code analysis tool as cppcheck.
Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
This slightly increases the RAM consumption per context, but saves code
size on architectures with an instruction for direct byte access (which is
most of them).
Although this is technically an API break, in practice, a realistic
application won't break: it would have had to bypass API functions and rely
on the field size (e.g. relying on -1 == 1 in a 1-bit field).
Results (arm-none-eabi-gcc 7.3.1, build_arm_none_eabi_gcc_m0plus build):
library/ssl_cli.o: 19543 -> 19559 (diff: -16)
library/ssl_msg.o: 24726 -> 24690 (diff: 36)
library/ssl_srv.o: 20462 -> 20418 (diff: 44)
library/ssl_tls.o: 20707 -> 20555 (diff: 152)
library/ssl_tls13_client.o: 7252 -> 7244 (diff: 8)
library/ssl_tls13_generic.o: 4705 -> 4693 (diff: 12)
Results (same architecture, config-suite-b.h + MBEDTLS_ECDH_LEGACY_CONTEXT +
MBEDTLS_ECP_RESTARTABLE):
library/ssl_cli.o: 2876 -> 2864 (diff: 12)
library/ssl_msg.o: 3068 -> 3080 (diff: -12)
library/ssl_srv.o: 3372 -> 3340 (diff: 32)
library/ssl_tls.o: 6658 -> 6566 (diff: 92)
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Move small fields first so that more fields can be within the Arm Thumb
128-element direct access window.
Keep the int section after the pointer section: moving int fields first cost
a few bytes on the reference baremetal-m0plus build.
The ordering in this commit is not based on field access frequency.
Results (arm-none-eabi-gcc 7.3.1, build_arm_none_eabi_gcc_m0plus build):
library/ssl_cli.o: 19687 -> 19543 (diff: 144)
library/ssl_msg.o: 24834 -> 24726 (diff: 108)
library/ssl_srv.o: 20562 -> 20462 (diff: 100)
library/ssl_tls.o: 20907 -> 20707 (diff: 200)
library/ssl_tls13_client.o: 7272 -> 7252 (diff: 20)
library/ssl_tls13_generic.o: 4721 -> 4705 (diff: 16)
Results (same architecture, config-suite-b.h + MBEDTLS_ECDH_LEGACY_CONTEXT +
MBEDTLS_ECP_RESTARTABLE):
library/ssl_cli.o: 2936 -> 2876 (diff: 60)
library/ssl_msg.o: 3080 -> 3068 (diff: 12)
library/ssl_srv.o: 3400 -> 3372 (diff: 28)
library/ssl_tls.o: 6730 -> 6658 (diff: 72)
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Move fields around to have fewer accesses outside the 128-element Thumb
direct access window.
In psa_hkdf_key_derivation_t, move the large fields (output_block, prk,
hmac) after the state bit-fields. Experimentally, it's slightly better
to put hmac last.
Other operations structures don't go outside the window, at least when not
considering nested structures.
Results (arm-none-eabi-gcc 7.3.1, build_arm_none_eabi_gcc_m0plus build):
library/psa_crypto.o: 16510 -> 16434 (diff: 76)
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Several files among include/psa/crypto_*.h are not meant to be included
directly, and are not guaranteed to be valid if included directly. This
makes it harder to perform some static analyses. So make these files more
self-contained so that at least, if included on their own, there is no
missing macro or type definition (excluding the deliberate use of forward
declarations of structs and unions).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Previously passing a NULL or zero length password into either
mbedtls_pkcs12_pbe() or mbedtls_pkcs12_derive() could cause an infinate
loop, and it was also possible to pass a NULL password, with a non-zero
length, which would cause memory corruption.
I have fixed these errors, and improved the documentation to reflect the
changes and further explain what is expected of the inputs.
Signed-off-by: Paul Elliott <paul.elliott@arm.com>
Remove client certificate verify in tests.
Change the layout of structure to fix abi_api check issues.
Add comments of Finished.
Align with the coding styles.
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
Fix the variable not inialized issue, remove the client
certificate related code, remove early data related code.
Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
The current definition of PSA_ALG_IS_HASH_AND_SIGN includes
PSA_ALG_RSA_PKCS1V15_SIGN_RAW and PSA_ALG_ECDSA_ANY, which don't strictly
follow the hash-and-sign paradigm: the algorithm does not encode a hash
algorithm that is applied prior to the signature step. The definition in
fact encompasses what can be used with psa_sign_hash/psa_verify_hash, so
it's the correct definition for PSA_ALG_IS_SIGN_HASH. Therefore this commit
moves definition of PSA_ALG_IS_HASH_AND_SIGN to PSA_ALG_IS_SIGN_HASH, and
replace the definition of PSA_ALG_IS_HASH_AND_SIGN by a correct one (based
on PSA_ALG_IS_SIGN_HASH, excluding the algorithms where the pre-signature
step isn't to apply the hash encoded in the algorithm).
In the definition of PSA_ALG_SIGN_GET_HASH, keep the condition for a nonzero
output to be PSA_ALG_IS_HASH_AND_SIGN.
Everywhere else in the code base (definition of PSA_ALG_IS_SIGN_MESSAGE, and
every use of PSA_ALG_IS_HASH_AND_SIGN outside of crypto_values.h), we meant
PSA_ALG_IS_SIGN_HASH where we wrote PSA_ALG_IS_HASH_AND_SIGN, so do a
global replacement.
```
git grep -l IS_HASH_AND_SIGN ':!include/psa/crypto_values.h' | xargs perl -i -pe 's/ALG_IS_HASH_AND_SIGN/ALG_IS_SIGN_HASH/g'
```
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
mbedtls_ssl_conf_groups allows supported groups for key
sharing to be configured via their IANA NamedGroup ID.
This is added in anticipation of PQC and Hybrid key
sharing algorithms being integrated into Mbed TLS.
mbedtls_ssl_conf_curves is deprecated in favor of
mbedtls_ssl_conf_groups. handshake_init has been
modified to translate and copy curves configured
via conf_curves into a heap allocatied array of
NamedGroup IDs. This allows the refactoring of code
interacting with conf_curve related variables (such
as curve_list) to use NamedGroup IDs while retaining
the deprecated API.
Signed-off-by: Brett Warren <brett.warren@arm.com>
Since there are no longer any alternative
MBEDTLS_DEPRECATED definitions in the codebase,
MBEDTLS_DEPRECATED can now be exported without breaking
anything.
Signed-off-by: Brett Warren <brett.warren@arm.com>
TLS 1.3: ServerHello: add utils functions used by ServerHello
Regarding the merge job, there was only one of the failure we currently encounter on almost all PR (Session resume using tickets, DTLS: openssl client test case see #5012) thus we can consider that this PR passed CI.
This is a variant of PSA_ALG_RSA_PSS which currently has exactly the same
behavior, but is intended to have a different behavior when verifying
signatures.
In a subsequent commit, PSA_ALG_RSA_PSS will change to requiring the salt
length to be what it would produce when signing, as is currently documented,
whereas PSA_ALG_RSA_PSS_ANY_SALT will retain the current behavior of
allowing any salt length (including 0).
Changes in this commit:
* New algorithm constructor PSA_ALG_RSA_PSS_ANY_SALT.
* New predicates PSA_ALG_IS_RSA_PSS_STANDARD_SALT (corresponding to
PSA_ALG_RSA_PSS) and PSA_ALG_IS_RSA_PSS_ANY_SALT (corresponding to
PSA_ALG_RSA_PSS_ANY_SALT).
* Support for the new predicates in macro_collector.py (needed for
generate_psa_constant_names).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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 the GCM.
Alternative 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.
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
The previous implementation was misparsed in constructs like
`if (condition) MBEDTLS_IGNORE_RETURN(...); else ...;`.
Implement it as an expression, tested with GCC, Clang and MSVC.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This macro is not used inside the library yet, but may be used in deprecated
functions in the future, if a function returning void has to change to
returning an error. It may also be useful in user code, so it is in a public
header.
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
MBEDTLS_CHECK_RETURN_TYPICAL defaults off, but is enabled if
MBEDTLS_CHECK_RETURN_WARNING is enabled at compile time.
(MBEDTLS_CHECK_RETURN_CRITICAL is always enabled.)
The default is off so that a plausible program that builds with one version
of Mbed TLS in the default configuration will still build under the next
version.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This is normally equivalent, but works even if some other header defines a
macro called warn_unused_result.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
An empty expansion is possible, but as documented its effect is to disable
the feature, so that isn't a good example. Instead, use the GCC
implementation as the default: it's plausible that it could work even on
compilers that don't advertise themselves as sufficiently GCC-like to define
__GNUC__, and if not it gives users a concrete idea of what the macro is
supposed to do.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
For all of these functions, the only possible failures are a hardware
accelerator (not possible unless using an ALT implementation), an internal
error or runtime corruption.
Exception: the self-tests, which serve little purpose if their status isn't
tested.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Define macros MBEDTLS_CHECK_RETURN_CRITICAL, MBEDTLS_CHECK_RETURN_TYPICAL
and MBEDTLS_CHECK_RETURN_OPTIONAL so that we can indicate on a
function-by-function basis whether checking the function's return value is
almost always necessary (CRITICAL), typically necessary in portable
applications but unnecessary in some reasonable cases (TYPICAL), or
typically unnecessary (OPTIONAL).
Update the documentation of MBEDTLS_CHECK_RETURN accordingly. This is split
between the user documentation (Doxygen, in config.h) and the internal
documentation (non-Doxygen, in platform_util.h, of minor importance since
the macro isn't meant to be used directly).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Declare all AES and DES functions that return int as needing to have
their result checked, and do check the result in our code.
A DES or AES block operation can fail in alternative implementations of
mbedtls_internal_aes_encrypt() (under MBEDTLS_AES_ENCRYPT_ALT),
mbedtls_internal_aes_decrypt() (under MBEDTLS_AES_DECRYPT_ALT),
mbedtls_des_crypt_ecb() (under MBEDTLS_DES_CRYPT_ECB_ALT),
mbedtls_des3_crypt_ecb() (under MBEDTLS_DES3_CRYPT_ECB_ALT).
A failure can happen if the accelerator peripheral is in a bad state.
Several block modes were not catching the error.
This commit does the following code changes, grouped together to avoid
having an intermediate commit where the build fails:
* Add MBEDTLS_CHECK_RETURN to all functions returning int in aes.h and des.h.
* Fix all places where this causes a GCC warning, indicating that our code
was not properly checking the result of an AES operation:
* In library code: on failure, goto exit and return ret.
* In pkey programs: goto exit.
* In the benchmark program: exit (not ideal since there's no error
message, but it's what the code currently does for failures).
* In test code: TEST_ASSERT.
* Changelog entry.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Put this macro before a function declaration to indicate that its result
must be checked. This commit supports GCC-like compilers and MSVC >=2012.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Also fiixed the following merge problems:
crypto_struct.h : Added MBEDTLS_PRIVATE to psa_aead_operation_s
members (merge conflict)
psa_crypto_aead.c : Added ciphertext_length to mbedtls_gcm_finish
call (change of API during development)
Signed-off-by: Paul Elliott <paul.elliott@arm.com>
The API reached 1.0.0 some time ago, and we've caught up with the
incompatible changes already.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
Use the encoding from an upcoming version of the specification.
Add as much (or as little) testing as is currently present for Camellia.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
CCM requires one of the 128-bit-block block ciphers to be useful, just like GCM.
GCM and CCM need the cipher module.
ChaChaPoly needs ChaCha20 and Poly1305.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This was already documented for mbedtls_md_info_t. Also document it for
mbedtls_pk_info_t (where it's fairly obvious since the structure is not
defined in a public header) and for mbedtls_cipher_info_t (where it's not
obvious since the structure is defined in a public header).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
The structures mbedtls_x509_time, mbedtls_x509_crl_entry, mbedtls_x509_crl,
mbedtls_x509_crt, mbedtls_x509_san_other_name,
mbedtls_x509_subject_alternative_name, mbedtls_x509_csr are designed to
expose the result of parsing X.509 data. Document many of their fields as
being publicly readable.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
The structures mbedtls_asn1_buf, mbedtls_asn1_bitstring,
mbedtls_asn1_sequence and mbedtls_asn1_named_data are designed to allow
access to data after parsing. Make their fields public.
Document that chaining fields are essentially read-only.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
On platforms with BSD-like sockets, it is useful for applications to have
access to the underlying file descriptor so that they can use functions like
select() and poll().
Do not promise that the field will exist on other platforms such as
Windows (where the type and name of the field are technically wrong because
Windows socket handles are actually not file descriptors).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Add functions to read the type, mode, name and key_bitlen fields from
mbedtls_cipher_info_t. These are the fields that applications are most
likely to care about.
TLS code also uses iv_size and block_size, which it might make sense to
expose, but most applications shouldn't need those, so I'm not exposing them
for now.
Call the new functions in unit tests, so they're at least smoke-tested.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
The whole point of this structure is to provide information, both for the
library's own sake and to applications.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Conflicts:
library/ccm.c
Conflict resolved by re-applying the MBEDTLS_BYTE_0 macro.
Conflict resolved by ignoring the MBEDTLS_PUT_UINT16_BE macro
used in development branch on the 'b' buffer, because the 'b'
buffer is removed in current branch.
The numerical identifier of the CID extension hasn't been settled yet
and different implementations use values from different drafts. Allow
configuring the value at compile time.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Move logic to ccm_starts, ccm_set_lengths, ccm_update_ad,
ccm_update and ccm_finish
Use separate variable to track context state.
Encode first block only if both mbedtls_ccm_starts() and
mbedtls_ccm_set_lengths() were called.
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
Now that descriptions of error codes no longer have to be on the same line
for the sake of generate_errors.pl, move them to their own line before the
definition. This aligns them with what we do for other definitions, and
means that we no longer need to have very long lines containing both the C
definition and the comment.
```
perl -i -pe 's~^(#define +MBEDTLS_ERR_\w+ +-\w+) */\*[*!]<(.*)\*/~/**$2*/\n$1~' include/mbedtls/*.h
```
This commit does not change the output of generate_errors.pl.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Instances of `mbedtls_ssl_session` represent data enabling session resumption.
With the introduction of TLS 1.3, the format of this data changes. We therefore
need TLS-version field as part of `mbedtlsl_ssl_session` which allows distinguish
1.2 and 1.3 sessions.
This commit introduces such a TLS-version field to mbedtls_ssl_session.
The change has a few ramifications:
- Session serialization/deserialization routines need to be adjusted.
This is achieved by adding the TLS-version after the header of
Mbed TLS version+config, and by having the subsequent structure
of the serialized data depend on the value of this field.
The details are described in terms of the RFC 8446 presentation language.
The 1.2 session (de)serialization are moved into static helper functions,
while the top-level session (de)serialization only parses the Mbed TLS
version+config header and the TLS-version field, and dispatches according
to the found version.
This way, it will be easy to add support for TLS 1.3 sessions in the future.
- Tests for session serialization need to be adjusted
- Once we add support for TLS 1.3, with runtime negotiation of 1.2 vs. 1.3,
we will need to have some logic comparing the TLS version of the proposed session
to the negotiated TLS version. For now, however, we only support TLS 1.2,
and no such logic is needed. Instead, we just store the TLS version in the
session structure at the same point when we populate mbedtls_ssl_context.minor_ver.
The change introduces some overlap between `mbedtls_ssl_session.minor_ver` and
`mbedtls_ssl_context.minor_ver`, which should be studied and potentially resolved.
However, with both fields being private and explicitly marked so, this can happen
in a later change.
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
Although checking if the key was symmetric was correct, its easier to
read if we just check the block length is not zero before we use it in a
division.
Signed-off-by: Paul Elliott <paul.elliott@arm.com>
Enable Curve448 support
Add test vectors to evaluate
* RFC 7748
* a known-answer public key export test.
* a known-answer ECDH (X448) test.
Signed-off-by: Archana <archana.madhavan@silabs.com>
If PSA_CIPHER_ENCRYPT_OUTPUT_SIZE was called on a non symmetric key,
then a divide by zero could happen, as PSA_CIPHER_BLOCK_LENGTH will
return 0 for such a key, and PSA_ROUND_UP_TO_MULTIPLE will divide by the
block length.
Signed-off-by: Paul Elliott <paul.elliott@arm.com>
Fix initialization of mbedtls_psa_cipher_operation_t by not initializing the mbedtls_cipher_context_t typed field completely.
Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
According to the PSA specification the PSA_USAGE_SIGN_HASH has the
permission to sign a message as PSA_USAGE_SIGN_MESSAGE. Similarly the
PSA_USAGE_VERIFY_HASH has the permission to verify a message as
PSA_USAGE_VERIFY_MESSAGE. These permission will also be present when
the application queries the usage flags of the key.
Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
Introduce new codes:
* MBEDTLS_ERR_SSL_UNSUPPORTED_EXTENSION
* MBEDTLS_ERR_SSL_NO_APPLICATION_PROTOCOL
These are returned when the corresponding alert is raised.
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This symbol is not declared in our code, so trying to explicitly
link to it causes a doxygen error.
Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
New name MBEDTLS_ERR_SSL_BAD_CERTIFICATE
Also, replace some instances of MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE
by MBEDTLS_ERR_SSL_DECODE_ERROR and MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER
as fit.
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
Any config with a version older than 3.0.0 or newer than
MBETLS_VERSION_NUMBER will be rejected.
This does mean that the current development version doesn'T accept *any*
value of MBETLS_CONFIG_VERSION, but this will be fixed when we bump the
version during our normal release process.
Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Also remove preprocessor logic for MBEDTLS_CONFIG_FILE, since
build_info.h alreadyy handles it.
This commit was generated using the following script:
# ========================
#!/bin/sh
git ls-files | grep -v '^include/mbedtls/build_info\.h$' | xargs sed -b -E -i '
/^#if !?defined\(MBEDTLS_CONFIG_FILE\)/i#include "mbedtls/build_info.h"
//,/^#endif/d
'
# ========================
Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Create a separate header file (mbedtls/build_info.h) to use when
depending on the config options defined in config.h.
Also copy the handling of the MBEDTLS_CONFIG_FILE macro into the new
header, so that the next commit can remove this code from every other
place where config.h used to be included.
Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
The functions mbedtls_pk_sign(), mbedtls_pk_sign_restartable(),
mbedtls_ecdsa_write_signature() and mbedtls_ecdsa_write_signature_restartable()
now take an extra parameter indicating the size of the output buffer for the
signature.
No change to RSA because for RSA, the output size is trivial to calculate.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Fix typos in the PBKDF2 documentation
Correct the constraints on PSA_KEY_USAGE_DERIVE and PSA_KEY_USAGE_VERIFY_DERIVATION, aligning them with the note against psa_key_derivation_input_key(). All key inputs must have the required usage flag to permit output or verification.
Correct the constraints on PSA_KEY_DERIVATION_INPUT_SECRET and PSA_KEY_DERIVATION_INPUT_PASSWORD, aligning them with 4feb611. psa_key_derivation_verify_key() does not require the secret/password input to be a key.
Signed-off-by: Andrew Thoelke <andrew.thoelke@arm.com>
Without this parameter, it would be hard for callers to know how many bytes
of output the function wrote into the output buffer. It would be possible,
since the cumulated output must have the same length as the cumulated input,
but it would be cumbersome for the caller to keep track.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Hashes used in RSA-PSS encoding (EMSA-PSS-ENCODE, see §9.1.1 in RFC
8017):
- H1: Hashing the message (step 2)
- H2: Hashing in the salt (step 6)
- H3: Mask generation function (step 9)
According to the standard:
- H1 and H2 MUST be done by the same hash function
- H3 is RECOMMENDED to be the same as the hash used for H1 and H2.
According to the implementation:
- H1 happens outside of the function call. It might or might not happen
and the implementation might or might not be aware of the hash used.
- H2 happens inside the function call, consistency with H1 is not
enforced and might not even be possible to detect.
- H3 is done with the same hash as H2 (with the exception of
mbedtls_rsassa_pss_verify_ext(), which takes a dedicated parameter for
the hash used in the MGF).
Issues with the documentation:
- The comments weren't always clear about the three hashes involved and
often only mentioned two of them (which two varied from function to
function).
- The documentation was giving the impression that the standard
recommends aligning H2 and H1 (which is not a recommendation but a
must).
Signed-off-by: Janos Follath <janos.follath@arm.com>
This saves some code when compiling for Thumb, where access to
fields with offset index > 127 requires intermediate address
computations. Frequently used fields should therefore be located
at the top of the structure, while less frequently used ones --
such as the export callback -- can be moved to the back.
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
