MBEDTLS_ECP_MAX_BITS doesn't make sense as a configuration option: it
must not be smaller than the largest supported curve, and it's useless
to set it to a larger value. So unconditionally set it to the size of
the largest supported curve. Remove it from the build configuration.
Alternative implementations must no longer need define this macro.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Conflicts:
include/mbedtls/ssl.h
include/psa/crypto_struct.h
Conflicts fixed by using the code from development branch
and manually re-applying the MBEDTLS_PRIVATE wrapping.
Mbed OS now provides POSIX-like time functions, although not alarm() nor
signal(). It is possible to implement MBEDTLS_TIMING_ALT on Mbed OS, so
we should not artificially prevent this in check-config. Remove the the
check that prevents implementing MBEDTLS_TIMING_ALT on Mbed OS.
Note that this limitation originally was added in the following commit,
although there isn't much context around why the restriction was
imposed: 63e7ebaaa1 ("Add material for generating yotta module"). In
2015, Mbed OS was quite a different thing: no RTOS, no threads, just an
asynchronous event loop model. I'd suppose the asynchronous event loop
model made it difficult before to implement MBEDTLS_TIMING_C on Mbed OS,
but that is no longer the case.
Fixes#4633
Signed-off-by: Jaeden Amero <jaeden.amero@arm.com>
Removing reference to RFC 7748 as it is more confusing than helpful. (It
decodes the scalars after masking which is not part of the encoding we
want to specify. Also, it has the explanation what it means by little
endian in a preceding section that is not trivial to find.)
We also explicitly specify constraint on leading zeroes.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The expression "the masking is omitted" assumes familiarity with
Montgomery curve private key format and even then can be confusing and
ambiguous or confusing.
Describe directly what format we mean and add some more background
information and reference to the standard as well.
Signed-off-by: Janos Follath <janos.follath@arm.com>
4-space indent is only guaranteed to result in a code block if there's a
blank line just before (details vary depending on the markdown
implementation, and doxygen isn't exactly markdown anyway). In a bullet
list, you need 8 spaces since the list itself is a nested construct
which takes a 4-space indent (even though you don't have to indent
continuation lines inside a bullet point by 4 spaces, 1 is enough).
Using \code...\encode which is rendering as intended.
Signed-off-by: Janos Follath <janos.follath@arm.com>
This level of detail can be confusing and could require even more detail
to clear it up. Simplifying it instead in alignment wiht the
documentation of existing setup functions.
Signed-off-by: Janos Follath <janos.follath@arm.com>
This reverts commit 03a5fd7780026b2ca0b4728352ded930f5a7cff9.
We're already calling the output of a PAKE a "shared secret". The
password is a shared secret (for PAKE where the verifier knows a
password-equivalent secret), but calling it "shared secret" or even just
"secret" would be confusing.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Technically this function takes a low entropy secret as an input which
might or might not be the password. Using the term "secret" in the
function name is less misleading.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The password stretching (using slow and/or memory hard hashes) in PAKEs
usually serves two purposes:
- Defending against server compromise impersonation attacks. J-PAKE is an
augmented PAKE and as such, stores a password-equivalent and defending
against this class of attacks is out of scope.
- Preventing offline dictionary attacks. J-PAKE is proven to be zero
knowledge and leaks no information beyond the fact if the passwords
matched and offline dictionary attack is not possible.
In summary: J-PAKE does not benefit from pasword stretching and is
unlikely to be an input. This part of the API is not necessary at this
point and can be added later.
Signed-off-by: Janos Follath <janos.follath@arm.com>
We are not confident about the stability of the PAKE interface (it is
just a proposal, not part of the standard yet). So we should explicitly
document it as experimental, subject to change.
Signed-off-by: Janos Follath <janos.follath@arm.com>
At this point this is a proposed PAKE interface for the PSA Crypto API
and not part of the official standard. Place the interface in
crypto_extra.h to make this clear.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The API has PSA_ALG_GCM and not PSA_ALG_AEAD_GCM, PSA_ALG_MD5 and not
PSA_ALG_HASH_MD5, etc., so PSA_ALG_PAKE_JPAKE should be PSA_ALG_JPAKE as
well.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The caller is likely to receive the inputs on the wire, and having a
known size for which they can confidently reject longer inputs would be
helpful in cases where the application can't just use the input in
place.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Define the size macros to 0 rather than empty. That will lead to fewer
weird errors when we start implementing.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Remove padding parameters as mbedtls_rsa_init()
cannot return an error code when padding
parameters are invalid.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
mbedtls_rsa_set_padding() now returns the error
code MBEDTLS_ERR_RSA_INVALID_PADDING when
padding parameters are invalid.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
ssl_server2 had a check that we never try to use a minor version lower
than 2 with DTLS, but that check is no longer needed, as there's no way
that would happen now that MBEDTLS_SSL_MINOR_VERSION_1 is no longer
public.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit removes the API
```
mbedtls_ssl_conf_ciphersuites_for_version()
```
which allows to configure lists of acceptable ciphersuites
for each supported version of SSL/TLS: SSL3, TLS 1.{0,1,2}.
With Mbed TLS 3.0, support for SSL3, TLS 1.0 and TLS 1.1
is dropped. Moreover, upcoming TLS 1.3 support has a different
notion of cipher suite and will require a different API.
This means that it's only for TLS 1.2 that we require
a ciphersuite configuration API, and
```
mbedtls_ssl_conf_ciphersuites()
```
can be used for that. The version-specific ciphersuite
configuration API `mbedtls_ssl_conf_ciphersuites_for_version()`,
in turn, is no longer needed.
Signed-off-by: Hanno Becker <hanno.becker@arm.com>
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
Note that this error has a negligible probability with a "crypto-sized"
bound, but macroscopic probability with a small bound.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Since mbedtls_mpi_random() is not specific to ECC code, move it from
the ECP module to the bignum module.
This increases the code size in builds without short Weierstrass
curves (including builds without ECC at all) that do not optimize out
unused functions.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Make input/output format documentation easier to find:
- Add direct reference to the steps from the input/output functions
- Move the format description directly to the step constants
Signed-off-by: Janos Follath <janos.follath@arm.com>
- Transformed setup description to a more explicit pseudocode based
approach.
- Explained implicit vs explicit key confirmation
Signed-off-by: Janos Follath <janos.follath@arm.com>
This step is not necessarily a memory-hard function. Memory-hard
functions are the best of the breed at the moment, but that's due to
current hardware designs, and CPU-hard-but-not-memory-hard functions
like PBKDF2 are acceptable as well. We're using “key stretching” as the
generic term for such functions.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The key derivation operation passed to psa_pake_set_password_mhf() might
enter an error state before the function returns. If this happens, the
user needs to know about it so that they can properly abort it.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The type of the key derivation operation was incorrect.
Also neither the PAKE nor key_derivation algorithm knows how many bytes
to transfer at this stage.
There is no optimal or recommended size, PAKEs don't mandate it either
(with the exception of OPAQUE, but that uses it internally and won't be
using this interface).
Adding an input length parameter to allow the application to control how
many bytes the PAKE takes from the key derivation.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Using memory hard functions with PAKEs is the more secure option. It
should be as convenient and efficient to use as less secure options, but
so far it required creating an additional temporary key object.
With psa_pake_set_password_mhf() this eliminates the need for this.
Similarly we could add a convenience function to supply the password
directly from character strings, but that would make the less secure
option more convenient again and therfore we are not doing it now.
Signed-off-by: Janos Follath <janos.follath@arm.com>
PAKE constructions that have multiple key shares will always consume and
produce the key shares in numerical order. So using PSA_PAKE_DATA_XXX_X
would demand step-sequence validation, and provides no functional
utility over having only PSA_PAKE_DATA_XXX.
Signed-off-by: Janos Follath <janos.follath@arm.com>
If PSA_PAKE_OUTPUT_SIZE takes cipher_suite as a parameter and it is a
structure it can't be a compile-time constant anymore.
Reintroducing psa_pake_primitive_t, because it can be constructed as an
integral type and holds enough information to allow PSA_PAKE_OUTPUT_SIZE
calculating accurate estimates on the output size in compile time.
Signed-off-by: Janos Follath <janos.follath@arm.com>
There are too many parameters to the setup function. This makes it hard
to figure out how to call the function and read code that calls the
function. This also opens the suspicion that there's yet another
parameter that we're missing.
Signed-off-by: Janos Follath <janos.follath@arm.com>
"Data" is too vague, renaming it to psa_pake_step_t. It is still
somewhat vague, but at least consistent with the naming used in key
derivation.
Signed-off-by: Janos Follath <janos.follath@arm.com>
__DOXYGEN_ONLY__ blocks were only used to typeset the PSA specification
back when it was extracted from Mbed TLS headers. They are no longer
used and should be removed.
The PSA Crypto Driver API is still under development and might be
extracted from Mbed TLS headers, leaving them there for now.
Signed-off-by: Janos Follath <janos.follath@arm.com>
It is the size of something that has no a priori reason to consist of 8
bits. This should be psa_pake_family_t, both for documentation (and
possibly static analysis) and in case 8 bits turn out not to be enough.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Identifier value was not consistent with PSA conventions (last byte is
reserved for hash algorithms or used in algorithms parametrized by
a hash).
Signed-off-by: Janos Follath <janos.follath@arm.com>
The cipher suite now defines the algorithm itself as well. Passing the
algorithm separately is redundant and error prone.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Making the cipher suite struct internal made a number of types and
macros in the interface unused.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Hiding the structure of the cipher suite implementation allows for
greater flexibility.
To preserve maximum flexibility, the constructor is replaced by
individual setter/getter functions.
Convenience macros and or functions can be added later.
Signed-off-by: Janos Follath <janos.follath@arm.com>
In the key types API, PSA Crypto uses ECC to denote Elliptic curve
cryptography and DH to denote Finite Field Diffie-Hellman.
Change PSA_PAKE_PRIMITIVE_TYPE_XXX macros to be aligned.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The macro PSA_PAKE_KEY_SHARE_SIZE has been removed, we need to remove
references to it from the documentation as well.
Signed-off-by: Janos Follath <janos.follath@arm.com>
There were remnants of the PSA specification wording in the
documentation that can be confusing in Mbed TLS.
We need to make it clear what the consequences of being implementation
defined are in Mbed TLS.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The main purpose of psa_pake_get_key_share() is to provide a more
straightforward and convenient call flow for regular PAKEs. Most PAKEs
have a single key share and need a flow like this:
op=PSA_PAKE_OPERATION_INIT;
psa_pake_setup();
psa_pake_get_key_share();
psa_pake_set_key_share();
psa_pake_get_implicit_key();
Adding psa_pake_get/set_key_share() functions cuts out the
psa_pake_data_t constants from the users vision, hiding complexity that
exists only for unrelated PAKEs that aren't relevant for the user.
This comes with the cost of the two additional API functions that we need
to maintain.
Since the current stream of work focuses on enabling J-PAKE, there are
no benefits to these functions for now.
Once algorithms that can benefit from this simplification are added,
adding back these functions can be reconsidered.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The documentation is calling PAKEs protocols but it has an
psa_algorithm_t identifier. To align the terminology, the documentation
should call them algorithms as well.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Fix the typo in the macro definition and more specific parameter names
allow for future scripts to check validity of arguments.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The PSA_KEY_TYPE_PASSWORD key type to which this documentation change
refers to is not yet present in the code and will be introduced by a
parallel line of work.
Signed-off-by: Janos Follath <janos.follath@arm.com>
PAKE protocols make use of a range of cryptographic schemes and
primitives. Standards allow for several options to use for each of them.
They call the combination of specific algorithms cipher suites,
configurations or options.
Cipher suites are represented by a separate data type for several
reasons:
1. To allow for individual PAKE protocols to provide pre-defined cipher
suites.
2. To organise cipher suites into a unit that can be handled separately
from the operation context. The PAKE operation flow is already
complex, will be even more so when key confirmation is added.
Handling them separately should reduce the surface of the interface
the application developer needs to pay attention at any given time.
Signed-off-by: Janos Follath <janos.follath@arm.com>
In most of the PAKEs the primitives are prime order groups, but some of
them might need the ring structure or just are using completely different
algebraic structures (eg. SRP or PQC schemes).
Signed-off-by: Janos Follath <janos.follath@arm.com>
Commit adds the conditional definition of
MBEDTLS_ECDH_LEGACY_CONTEXT to ecdh.h.
MBEDTLS_ECDH_LEGACY_CONTEXT is only defined
if MBEDTLS_ECP_RESTARTABLE is definied.
Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
Commit removes the definition of
MBEDTLS_ECDH_LEGACY_CONTEXT from config.h.
Additionally removes the unset calls to
MBEDTLS_ECDH_LEGACY_CONTEXT in all.sh.
Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
Split operation start and the declaration of data lengths
to better align with the PSA Cryptography multipart AEAD
APIs.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
MBEDTLS_ECP_FIXED_POINT_OPTIM aims to speed up ecc multiplication performance.
We compute the comb table in runtime now. It is a costly operation.
This patch add a pre-computed table to initialize well-known curves. It speed up ECDSA signature verify process in runtime by using more ROM size.
Signed-off-by: kXuan <kxuanobj@gmail.com>
- the \internal note said that calling cipher_init() first would be made
mandatory later, but the documention of the ctx parameter already said
the context had to be initialized...
- the documentation was using the word initialize for two different
meanings (calling setup() vs calling init()), making the documentation
of the ctx parameter quite confusing (you must initialize before you can
initialize...)
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
Improve some length parameter descriptions, aligning
them with the descriptions for the one-shot
functions.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Change from `body` to `input` to refer to the input data.
Add prefix total_ to the new length parameters
to ease refering to them in the documentation of
the other multi-part APIs.
Add error code documentation.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Define the dependency symbols PSA_WANT_ALG_ECDSA_ANY and
PSA_WANT_ALG_RSA_PKCS1V15_SIGN_RAW as de facto synonyms of
PSA_WANT_ALG_ECDSA and PSA_WANT_ALG_RSA_PKCS1V15_SIGN respectively: if
either one is requested, the other is set.
This makes it easier to systematically determine the dependencies of
an algorithm.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Define CCM multi-part API along the lines of the
GCM multi-part API. The two APIs are not exactly
the same as, contrary to GCM, CCM needs the size
of the additional data and plaintext/ciphertext
from the start.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
