In psa_generator_import_key, if generating a DES or 3DES key, set the
parity bits.
Add tests for deriving a DES key. Also test deriving an AES key while
I'm at it.
In psa_generator_hkdf_read, return BAD_STATE if we're trying to
construct more output than the algorithm allows. This can't happen
through the API due to the capacity limit, but it could potentially
happen in an internal call.
Also add a test case that verifies that we can set up HKDF with its
maximum capacity and read up to the maximum capacity.
New key type PSA_KEY_TYPE_DERIVE. New usage flag PSA_KEY_USAGE_DERIVE.
New function psa_key_derivation.
No key derivation algorithm is implemented yet. The code may not
compile with -Wunused.
Write some unit test code for psa_key_derivation. Most of it cannot be
used yet due to the lack of a key derivation algorithm.
Add an API for byte generators: psa_crypto_generator_t,
PSA_CRYPTO_GENERATOR_INIT, psa_crypto_generator_init,
psa_get_generator_capacity, psa_generator_read,
psa_generator_import_key, psa_generator_abort.
This commit does not yet implement any generator algorithm, it only
provides the framework. This code may not compile with -Wunused.
In psa_mac_setup and psa_hmac_setup_internal, perform a sanity check
on the hash size and the hash block size respectively. These sanity
checks should only trigger on an incompletely or incorrectly
implemented hash function.
Remove the check on the block size in psa_hmac_finish_internal
because at this point it has already been checked and used.
In the common case (key no longer than the block size), psa_hash_setup
was being called twice in succession. With current implementations
this is just a small performance loss, but potentially with
alternative implementations this could have lead to a memory leak.
Call psa_hash_setup in psa_hmac_setup_internal rather than
psa_mac_init. This makes it easier to use psa_hmac_setup_internal on
its own (for the sake of using HMAC internally inside the library).
Create internal functions for HMAC operations. This prepares for two
things: separating crypto-sensitive code from argument decoding and
validation, and using HMAC for other purposes than a MAC inside the
library (e.g. HMAC_DRBG, HKDF).
No intended observable behavior change in this commit.
Although RSASSA-PSS defines its input as a message to be hashed, we
implement a sign-the-hash function. This function can take an input
which isn't a hash, so don't restrict the size of the input, any more
than Mbed TLS does.
Remove a redundant check that hash_length fits in unsigned int for the
sake of Mbed TLS RSA functions.
Test that PSS accepts inputs of various lengths. For PKCS#1 v1.5
signature in raw mode, test the maximum input length.
No common signature algorithm uses a salt (RSA-PKCS#1v1.5, RSA-PSS,
DSA, ECDSA, EdDSA). We don't even take an IV for MAC whereas MAC
algorithms with IV are uncommon but heard of. So remove the salt
parameter from psa_asymmetric_sign and psa_asymmetric_verify.
We failed check-names.sh due to using a define which wasn't described or
defined anywhere. Even though we won't realistically enable
MBEDTLS_PSA_CRYPTO_SPM via the configuration system (and will do it from
PSA Crypto SPM tooling instead), add a description of the configuration to
config.h as good practice. Exclude MBEDTLS_PSA_CRYPTO_SPM from the "full"
configuration as well.
We failed all.sh on the "test: doxygen markup outside doxygen blocks" due
to doxygen markup being outside a Doxygen block. Add an extra `*` to the
psa_get_key_from_slot comment to denote the comment as a Doxygen comment.
Make function names for multipart operations more consistent (cipher
edition).
Rename symmetric cipher multipart operation functions so that they all
start with psa_cipher_:
* psa_encrypt_setup -> psa_cipher_encrypt_setup
* psa_decrypt_setup -> psa_cipher_decrypt_setup
* psa_encrypt_set_iv -> psa_cipher_set_iv
* psa_encrypt_generate_iv -> psa_cipher_generate_iv
Use if-else-if chains rather than switch because many blocks apply to
a class of algoritmhs rather than a single algorithm or a fixed set
of algorithms.
Call abort on more error paths that were missed earlier.
Reorganize error handling code in psa_mac_finish_internal,
psa_mac_sign_finish and psa_mac_verify finish to ensure that:
* psa_mac_abort() is always called, on all success and error paths.
* psa_mac_finish places a safe value in the output parameters on
all error paths, even if abort fails.
Make function names for multipart operations more consistent (MAC
setup edition).
Split psa_mac_setup into two functions psa_mac_sign_setup and
psa_mac_verify_setup. These functions behave identically except that
they require different usage flags on the key. The goal of the split
is to enforce the key policy during setup rather than at the end of
the operation (which was a bit of a hack).
In psa_mac_sign_finish and psa_mac_verify_finish, if the operation is
of the wrong type, abort the operation before returning BAD_STATE.
In mbedtls_rsa_rsaes_oaep_encrypt and
mbedtls_rsa_rsaes_pkcs1_v15_encrypt, if the input length is 0 (which
is unusual and mostly useless, but permitted) then it is fine for the
input pointer to be NULL. Don't return an error in this case.
When `input` is NULL, `memcpy( p, input, ilen )` has undefined
behavior even if `ilen` is zero. So skip the `memcpy` call in this
case. Likewise, in `mbedtls_rsa_rsaes_oaep_decrypt` and
`mbedtls_rsa_rsaes_pkcs1_v15_decrypt`, skip the `memcpy` call if
`*olen` is zero.
Isolate the code of psa_get_key_information that calculates the bit
size of a key into its own function which can be called by functions
that have a key slot pointer.
Add required includes in tests and psa_crypto.c file in order to be able to compilef for the SPM solution.
Some functions needed to be deprecated from psa_crypto.c since they already implemented in the SPM.
New functions psa_get_key_slot(), psa_get_empty_key_slot(),
psa_get_key_from_slot() to access a key slot object from a key slot
number. These functions perform all requisite validations:
* psa_get_key_slot() verifies that the key slot number is in range.
* psa_get_empty_key_slot() verifies that the slot is empty.
* psa_get_key_from_slot() verifies that the slot contains a key with
a suitable policy.
Always use these functions so as to make sure that the requisite
validations are always performed.
In psa_hash_finish and psa_mac_finish_internal, set the fallback
output length (which is reported on error) to the output buffer size,
not to the _expected_ buffer size which could be larger.
When the size of a buffer is 0, the corresponding pointer argument may
be null. In such cases, library functions must not perform arithmetic
on the pointer or call standard library functions such as memset and
memcpy, since that would be undefined behavior in C. Protect such
cases.
Refactor the storage of a 0-sized raw data object to make it store a
null pointer, rather than depending on the behavior of calloc(1,0).
The RSA module uses unsigned int for hash_length. The PSA Crypto API
uses size_t for hash_length. Cast hash_length to unsigned int when
passed to the hash module.
The GCM, CCM, RSA, and cipher modules inconsistently use int or unsigned
int for a count of bits. The PSA Crypto API uses size_t for counting
things. This causes issues on LLP64 systems where a size_t can hold more
than an unsigned int. Add casts for where key_bits and bits are passed to
mbedtls_* APIs.
Use size_t for block_size in psa_mac_abort() because
psa_get_hash_block_size() returns a size_t. This also helps to avoid
compiler warnings on LLP64 systems.
