The coordinates are over $F_{2^{255}-19}$, so by the general
definition of the bit size associated with the curve in the
specification, the value for size attribute of keys is 255.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
The size attribute of a key is expressed in bits, so use bits in the
documentation. (The documentation of psa_export_key() describes the
export format, so it counts in bytes.)
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Call it “SHAKE256-512”, just like SHA3-512 has 512 bits of output.
SHAKE256-64 looks like it's 64 bits of output, but this is 64 bytes.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Define algorithms for PureEdDSA and for HashEdDSA, the EdDSA variants
defined by RFC 8032.
The encoding for HashEdDSA needs to encode the hash algorithm so that
the hash can be calculated by passing PSA_ALG_SIGN_GET_HASH(sig_alg)
to psa_hash_compute() or psa_hash_setup(). As a consequence,
Ed25519ph (using SHA-512) and Ed448ph (using SHAKE256) need to have
different algorithm encodings (the key is enough to tell them apart,
but it is not known while hashing). Another consequence is that the
API needs to recognize the Ed448 prehash (64 bytes of SHAKE256 output)
as a hash algorithm.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Add an elliptic curve family for the twisted Edwards curves
Edwards25519 and Edwards448 ("Goldilocks"). As with Montgomery curves,
since these are the only two curves in common use, the family has a
generic name.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Remove cipher_generate_iv driver entry point as there
is no known use case to delegate this to a driver.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
The IV length computed in the cipher PSA implementation is
the default IV length thus use the PSA macro PSA_CIPHER_IV_LENGTH
defined to do that.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Use psa_generate_random() to generate IVs instead of
mbedtls_psa_get_random(). mbedtls_psa_get_random() is
meant to be used as the f_rng argument of Mbed TLS
library functions.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Add cipher accelerator compilation flags to
test_psa_crypto_drivers() all.sh component. The flags
are not necessary currently but may become.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Symmetric key management is not intended to be
delegated to drivers. Thus, key management code
for a given symmetric key type should be included
in the library whether or not the support for
cryptographic operations based on that type of
symmetric key may be delegated to drivers.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Test cipher operations by a transparent driver in all.sh
test_psa_crypto_config_basic and
test_psa_crypto_drivers components.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Isolate the Mbed TLS cipher driver interfaces.
Do the actual cipher operations in utility
functions that are just called by the interface
functions.
The utility functions are intended to be also called
by the cipher test driver interface functions (to be
introduced subsequently) and allow to test the case
where cipher operations are fully accelerated with no
fallback (component test_psa_crypto_config_basic of
all.sh).
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
As per drivers, pass to the Mbed TLS implementation of
the cipher multi-part operation its operation context
and not the PSA operation context.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Move members that are of no use to the PSA crypto core
to the Mbed TLS implementation specific operation context.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
For cipher multi-part operations, dispatch based on
the driver identifier even in the case of the
Mbed TLS software implementation (viewed as a driver).
Also use the driver identifier to check that an
cipher operation context is active or not.
This aligns the way hash and cipher multi-part
operations are dispatched.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Make use of psa_cipher_xyz_internal() functions to
simplify the transparent test driver code and
extend the algorithms it supports to all algorithms
supported by the MbedTLS library.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Change the operation context to the PSA one to be
able to call the software implementation from
the driver wrapper later on.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Change the signature of
psa_driver_wrapper_cipher_encrypt/decrypt_setup to
that of a PSA driver cipher_encrypt/decrypt_setup
entry point.
Change the operation context to the PSA one to be
able to call the software implementation from
the driver wrapper later on.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Split out the cipher setup based on cipher.c
in psa_cipher_setup_internal() whose signature
is that of a PSA driver cipher_setup entry
point.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Rework psa_cipher_setup in preparation of
calling the cipher setup based on cipher.c
through the interface of a PSA driver
cipher_setup entry point.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Add psa_crypto_cipher.[ch] files to contain the
Mbed TLS implementation of PSA driver cipher driver
entry points.
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
