Define test driver entry points that provide an alternative
to Mbed TLS driver entry points only when the PSA configuration
is used. Their purpose is only to test the PSA configuration
thus there is no good reason to use them out of this scope.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
The test entry points defined in psa_crypto_hash.c
and psa_crypto_mac.c are supposed to be exact
clones of the Mbed TLS driver entry points. Thus
the operation type should be the Mbed TLS operation
type not a test one. There was no compilation error
as the hash and cipher operation test types are
currently equal to the Mbed TLS ones.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Align RSA/ECP sign/verify hash dispatch with the
corresponding code of the library. The library
code was modified recently but not the test code
one and these modifications ease the following work.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Don't use the output buffer in psa_cipher_encrypt()
to pass the generated IV to the driver as local
attacker could potentially control it.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Align the execution of cipher one-shot APIs with
that of cipher multi-part APIs: always exit
through the exit-labelled section.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Don't use the output buffer in psa_cipher_generate_iv()
to pass the generated IV to the driver as local
attacker could potentially control it.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
The report of RSA public exponent for opaque keys is not
supported. Do not attempt to compute the RSA public
exponent of an RSA opaque key associated to a driver
implementing the new driver interface when
MBEDTLS_PSA_CRYPTO_SE_C is disabled.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Slot number key attribute is specific of dynamically
registered drivers and should thus not be computed/
returned in case of keys associated to drivers
implementing the new unified driver interface.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Clarify the purpose of
psa_get_and_lock_transparent_key_slot_with_policy() and
define it even when MBEDTLS_PSA_CRYPTO_SE_C is disabled
for the purpose of static drivers.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
psa_key_derivation_output_key: prioritize BAD_STATE over NOT_PERMITTED
If psa_key_derivation_output_key() is called on an operation which hasn't been
set up or which has been aborted, return PSA_ERROR_BAD_STATE. Only return
PSA_ERROR_NOT_PERMITTED if the operation state is ok for
psa_key_derivation_input_bytes() or psa_key_derivation_output_bytes() but not
ok to output a key.
Ideally psa_key_derivation_output_key() would return PSA_ERROR_NOT_PERMITTED
only when psa_key_derivation_output_bytes() is possible, but this is clumsier
to implement.
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
Move fields around to have fewer accesses outside the 128-element Thumb
direct access window.
In psa_crypto.c's global_data, put the state fields first (-20).
In psa_crypto_slot_management.c's global_data, keep the key slots first
(otherwise it's +24).
In mbedtls_psa_random_context_t, swapping entropy and drbg makes no
difference (at least when the DRBG is mbedtls_ctr_drbg_context).
Results (arm-none-eabi-gcc 7.3.1, build_arm_none_eabi_gcc_m0plus build):
library/psa_crypto.o: 16166 -> 16146 (diff: 20)
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.
In aead_operation_t, tag_length was outside the window. The details depend
on the sizes of contexts included in ctx. Make the large ctx be the last
field.
In mbedtls_psa_hmac_operation_t, the opad field is outside the window when
SHA-512 is enabled. Moving opad before hash_ctx only saves 4 bytes and made
the structure clumsy, so I left it alone.
Results (arm-none-eabi-gcc 7.3.1, build_arm_none_eabi_gcc_m0plus build):
library/psa_crypto.o: 16246 -> 16166 (diff: 80)
library/psa_crypto_aead.o: 952 -> 928 (diff: 24)
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This comment is about how the functions are implemented, not about their
public interface, so it doesn't belong in the header file.
It applies to everything in constant_time.c so moved there.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
The equality checker functions always return 0 or 1 value,
thus the type of return value can be the same dispite of the
size of the parameters.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
Tne unpadding part of `mbedtls_rsa_rsaes_pkcs1_v15_decrypt` function is
contant-time therefore it moved to a separate function to be prepared
for moving to the contant-time module.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
Add a constant-time function with size_t parameter for choosing
between two integer values, like the ?: ternary operator.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
All function declaration provided by ssl_invasive.h is needed only for
testing purposes and all of them are provided by constant_time.h as well.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
Elinimate macros defined by modules locally in the functions that are
moving to the new constant-time module.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
There were multiple functions called mbedtls_cf_size_bool_eq. They had exactly
the same behavior, so move the one in bignum.c and remove the other.
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This is a workaround for an issue with mkstemp() in older MinGW releases that
causes simultaneous creation of .a files in the same directory to fail.
Fixes#5146
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
The makefile build specifies -L. -lmbedx509 -lmbedcrypto flags first,
and only then object files referencing symbols from those libraries.
In this order the linker will not add the linked libraries to the
DT_NEEDED section because they are not referenced yet (at least that
happens for me on ubuntu 20.04 with the default gnu compiler tools).
By first specifying the object files and then the linked libraries, we
do end up with libmbedx509 and libmbedcrypto in the DT_NEEDED sections.
This way running dlopen(...) on libmedtls.so just works.
Note that the CMake build does this by default.
Signed-off-by: Harmen Stoppels <harmenstoppels@gmail.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>
PSA_ALG_RSA_PSS algorithm now accepts only the same salt length for
verification that it produces when signing, as documented.
Fixes#4946.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
To test c <= high, instead of testing the sign of (high + 1) - c, negate the
sign of high - c (as we're doing for c - low). This is a little easier to
read and shaves 2 instructions off the arm thumb build with
arm-none-eabi-gcc 7.3.1.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
n was used for two different purposes. Give it a different name the second
time. This does not seem to change the generated code when compiling with
optimization for size or performance.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Instead of doing constant-flow table lookup, which requires 64 memory loads
for each lookup into a 64-entry table, do a range-based calculation, which
requires more CPU instructions per range but there are only 5 ranges.
I expect a significant performance gain (although smaller than for decoding
since the encoding table is half the size), but I haven't measured. Code
size is slightly smaller.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Document what each local variable does when it isn't obvious from the name.
Don't reuse a variable for different purposes.
This commit has very little impact on the generated code (same code size on
a sample Thumb build), although it does fix a theoretical bug that 2^32
spaces inside a line would be ignored instead of treated as an error.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Instead of doing constant-flow table lookup, which requires 128 memory loads
for each lookup into a 128-entry table, do a range-based calculation, which
requires more CPU instructions per range but there are only 5 ranges.
Experimentally, this is ~12x faster on my PC (based on
programs/x509/load_roots). The code is slightly smaller, too.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Base64 decoding uses equality comparison tests for characters that don't
leak information about the content of the data other than its length, such
as whitespace. Do this with '=' as well, since it only reveals information
about the length. This way the table lookup can focus on character validity
and decoding value.
Signed-off-by: Gilles Peskine <Gilles.Peskine@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>
