Commit Graph

435 Commits

Author SHA1 Message Date
Gilles Peskine
35675b6b26 Terminology: say "key derivation operation", not "generator"
Generators are mostly about key derivation (currently: only about key
derivation). "Generator" is not a commonly used term in cryptography.
So favor "derivation" as terminology.

This commit updates the function descriptions.
2019-05-16 18:55:25 +02:00
Gilles Peskine
cbe6650394 Rename generator-related internal identifiers
perl -pe 's/crypto_generator/key_derivation/gi' $(git ls-files)
    perl -pe 's/_generator/_key_derivation/gi' $(git ls-files)
2019-05-16 18:55:25 +02:00
Gilles Peskine
a99d3fbd05 Rename generator functions to psa_key_derivation_xxx
Generators are mostly about key derivation (currently: only about key
derivation). "Generator" is not a commonly used term in cryptography.
So favor "derivation" as terminology. Call a generator a key
derivation operation structure, since it behaves like other multipart
operation structures. Furthermore, the function names are not fully
consistent.

In this commit, I rename the functions to consistently have the prefix
"psa_key_derivation_". I used the following command:

    perl -i -pe '%t = (
        psa_crypto_generator_t => "psa_key_derivation_operation_t",
        psa_crypto_generator_init => "psa_key_derivation_init",
        psa_key_derivation_setup => "psa_key_derivation_setup",
        psa_key_derivation_input_key => "psa_key_derivation_input_key",
        psa_key_derivation_input_bytes => "psa_key_derivation_input_bytes",
        psa_key_agreement => "psa_key_derivation_key_agreement",
        psa_set_generator_capacity => "psa_key_derivation_set_capacity",
        psa_get_generator_capacity => "psa_key_derivation_get_capacity",
        psa_generator_read => "psa_key_derivation_output_bytes",
        psa_generate_derived_key => "psa_key_derivation_output_key",
        psa_generator_abort => "psa_key_derivation_abort",
        PSA_CRYPTO_GENERATOR_INIT => "PSA_KEY_DERIVATION_OPERATION_INIT",
        PSA_GENERATOR_UNBRIDLED_CAPACITY => "PSA_KEY_DERIVATION_UNLIMITED_CAPACITY",
        ); s/\b(@{[join("|", keys %t)]})\b/$t{$1}/ge' $(git ls-files)
2019-05-16 18:55:21 +02:00
Jaeden Amero
d35249e66f
Merge pull request #109 from gilles-peskine-arm/psa-key_attributes-set_persistent
Individual setters for persistent key attributes
2019-05-16 17:28:53 +01:00
Jaeden Amero
99e8d26a75
Merge pull request #104 from gilles-peskine-arm/psa-global_key_id
Make key ids global and define their range
2019-05-16 17:11:59 +01:00
Gilles Peskine
f1b7694768 Minor documentation improvements 2019-05-16 16:10:59 +02:00
Jaeden Amero
16ab39102e
Merge pull request #102 from gilles-peskine-arm/psa-aead_multipart-delay
Multipart AEAD buffer output sizes
2019-05-16 13:34:21 +01:00
Jaeden Amero
76be7f9c70
Merge pull request #108 from gilles-peskine-arm/psa-copy_key-policy
Add policy usage flag to copy a key
2019-05-16 12:08:13 +01:00
Gilles Peskine
73676cbc50 Put handle parameter last: psa_import_key
In psa_import_key, change the order of parameters to pass
the pointer where the newly created handle will be stored last.
This is consistent with most other library functions that put inputs
before outputs.
2019-05-15 23:16:07 +02:00
Gilles Peskine
806051f17e Update an obsolete use of psa_import_key in documentation
psa_import_key now takes an attribute structure, not a type.
2019-05-15 23:15:49 +02:00
Gilles Peskine
98dd779eb5 Put handle parameter last: psa_generate_derived_key
In psa_generate_derived_key, change the order of parameters to pass
the pointer where the newly created handle will be stored last.
This is consistent with most other library functions that put inputs
before outputs.
2019-05-15 20:15:31 +02:00
Gilles Peskine
dc8219a10d Replace psa_make_key_persistent by id/lifetime setters
Use individual setters for the id and lifetime fields of an attribute
structure, like the other attributes.

This commit updates the specification and adds an implementation of
the new setters.
2019-05-15 19:14:05 +02:00
Gilles Peskine
d6a8f5f1b5 Improve description of PSA_KEY_USAGE_COPY
Be more clear about when EXPORT is also required.
2019-05-14 16:25:50 +02:00
Gilles Peskine
ac99e32b79 Documentation improvements 2019-05-14 16:11:07 +02:00
Gilles Peskine
8e0206aa26 New usage flag PSA_KEY_USAGE_COPY
Document the new flag and allow its use.
2019-05-14 14:24:28 +02:00
Gilles Peskine
4318dfc8ec psa_export_key, psa_export_public_key: document the EXPORT flag 2019-05-14 14:23:32 +02:00
Jaeden Amero
1fe90fab30
Merge pull request #101 from gilles-peskine-arm/psa-key_attributes-verify_attributes
Check unused attributes in import and copy
2019-05-13 11:48:40 +01:00
Gilles Peskine
4a231b8d3b Break up key identifiers into user, vendor and reserved ranges
Define a range of key identifiers for use by the application
(0..2^30-1), a range for use by implementations (2^30..2^31), and a
range that is reserved for future use (2^31..2^32-1).
2019-05-06 18:56:14 +02:00
Gilles Peskine
225010fdf7 Remove lifetime parameter from psa_open_key
Change the scope of key identifiers to be global, rather than
per lifetime. As a result, you now need to specify the lifetime of a
key only when creating it.
2019-05-06 18:52:22 +02:00
Gilles Peskine
f02aec90dc Allow AEAD update output to be delayed
Do not require finish() to have empty output for any algorithm. Some
hardware does not support immediate stream processing.
2019-05-06 15:59:44 +02:00
Gilles Peskine
49dd8d8cec Add size macros for multipart AEAD
New macros PSA_AEAD_UPDATE_OUTPUT_SIZE, PSA_AEAD_FINISH_OUTPUT_SIZE
and PSA_AEAD_VERIFY_OUTPUT_SIZE to determine the output buffer sizes
for psa_aead_update(), psa_aead_finish() and psa_aead_verify().
2019-05-06 15:59:16 +02:00
Gilles Peskine
5211efb317 Add output parameter for psa_aead_verify
Like psa_aead_finish(), psa_aead_verify() needs to produce output from
the last partial block of input if psa_aead_update() cannot produce
output byte by byte.
2019-05-06 15:56:05 +02:00
Gilles Peskine
4ce2a9dcbf Check unused attributes in import and copy
In psa_import_key and psa_copy_key, some information comes from the
key data (input buffer or source key) rather than from the attributes:
key size for import, key size and type and domain parameters for copy.
If an unused attribute is nonzero in the attribute structure, check
that it matches the correct value. This protects against application
errors.
2019-05-03 16:57:15 +02:00
Adrian L. Shaw
5a5a79ae2a Rename psa_generate_key() and psa_generator_import_key() 2019-05-03 15:44:28 +01:00
Gilles Peskine
1ea5e44c93 Minor documentation improvement 2019-05-02 20:31:10 +02:00
Gilles Peskine
aa02c17dfa Add buffer size macro for psa_get_key_domain_parameters 2019-04-28 11:48:29 +02:00
Gilles Peskine
9c640f91d4 Improve documentation of key attributes 2019-04-28 11:48:26 +02:00
Gilles Peskine
06af0cd4a3 Always require reset after psa_get_key_attributes
There was a guarantee that psa_get_key_attributes() does not require a
subsequent psa_reset_key_attributes() to free resources as long as the
key was created with attributes having this property. This requirement
was hard to pin down because if a key is created with default
parameters, there are cases where it is difficult to ensure that the
domain parameters will be reported without allocating memory. So
remove this guarantee. Now the only case psa_reset_key_attributes() is
not required is if the attribute structure has only been modified with
certain specific setters.
2019-04-28 11:46:10 +02:00
Gilles Peskine
e56e878207 Remove extra parameter from psa_generate_key
Read extra data from the domain parameters in the attribute structure
instead of taking an argument on the function call.

Implement this for RSA key generation, where the public exponent can
be set as a domain parameter.

Add tests that generate RSA keys with various public exponents.
2019-04-26 17:37:50 +02:00
Gilles Peskine
b699f07af0 Switch psa_{get,set}_domain_parameters to attributes
Change psa_get_domain_parameters() and psa_set_domain_parameters() to
access a psa_key_attributes_t structure rather than a key handle.

In psa_get_key_attributes(), treat the RSA public exponent as a domain
parameter and read it out. This is in preparation for removing the
`extra` parameter of psa_generate_key() and setting the RSA public
exponent for key generation via domain parameters.

In this commit, the default public exponent 65537 is not treated
specially, which allows us to verify that test code that should be
calling psa_reset_key_attributes() after retrieving the attributes of
an RSA key is doing so properly (if it wasn't, there would be a memory
leak), even if the test data happens to use an RSA key with the
default public exponent.
2019-04-26 17:37:08 +02:00
Gilles Peskine
3a4f1f8e46 Set the key size as an attribute
Instead of passing a separate parameter for the key size to
psa_generate_key and psa_generator_import_key, set it through the
attributes, like the key type and other metadata.
2019-04-26 13:49:28 +02:00
Gilles Peskine
a3dd737be4 Move legacy definitions to crypto_extra.h
Types and functions that are not used in the attribute-based key
creation API are now implementation-specific extensions, kept around
until we finish transitioning to the new API.
2019-04-24 15:47:30 +02:00
Gilles Peskine
2062859496 Document the new functions related to key attributes
Also update the documentation of key creation functions that have been
modified to use key attributes.
2019-04-24 15:47:30 +02:00
Gilles Peskine
8c8f2ab66b Implement psa_get_key_attributes
Implement attribute querying.

Test attribute getters and setters. Use psa_get_key_attributes instead
of the deprecated functions psa_get_key_policy or
psa_get_key_information in most tests.
2019-04-24 15:46:04 +02:00
Gilles Peskine
4747d19d18 Implement atomic-creation psa_import_key
Implement the new, attribute-based psa_import_key and some basic
functions to access psa_key_attributes_t. Replace
psa_import_key_to_handle by psa_import_key in a few test functions.

This commit does not handle persistence attributes yet.
2019-04-24 15:45:50 +02:00
Gilles Peskine
87a5e565f4 Rename functions that inject key material to an allocated handle
This commit starts a migration to a new interface for key creation.
Today, the application allocates a handle, then fills its metadata,
and finally injects key material. The new interface fills metadata
into a temporary structure, and a handle is allocated at the same time
it gets filled with both metadata and key material.

This commit was obtained by moving the declaration of the old-style
functions to crypto_extra.h and renaming them with the to_handle
suffix, adding declarations for the new-style functions in crypto.h
under their new name, and running

    perl -i -pe 's/\bpsa_(import|copy|generator_import|generate)_key\b/$&_to_handle/g' library/*.c tests/suites/*.function programs/psa/*.c
    perl -i -pe 's/\bpsa_get_key_lifetime\b/$&_from_handle/g' library/*.c tests/suites/*.function programs/psa/*.c

Many functions that are specific to the old interface, and which will
not remain under the same name with the new interface, are still in
crypto.h for now.

All functional tests should still pass. The documentation may have
some broken links.
2019-04-24 15:24:45 +02:00
Gilles Peskine
3135184cfc Merge remote-tracking branch 'upstream-crypto/development' into psa-api-beta2-merge-development
Merge the Mbed Crypto development branch a little after
mbedcrypto-1.0.0 into the PSA Crypto API 1.0 beta branch a little
after beta 2.

Summary of merge conflicts:

* Some features (psa_copy_key, public key format without
  SubjectPublicKeyInfo wrapping) went into both sides, but with a few
  improvements on the implementation side. For those, take the
  implementation side.
* The key derivation API changed considerably on the API side. This
  merge commit generally goes with the updated API except in the tests
  where it keeps some aspects of the implementation.

Due to the divergence between the two branches on key derivation and
key agreement, test_suite_psa_crypto does not compile. This will be
resolved in subsequent commits.
2019-04-09 12:00:00 +02:00
Gilles Peskine
ee67dd61bc Fix Doxygen warnings 2019-03-12 13:23:17 +01:00
Gilles Peskine
5579971cb1 psa_generator_import_key (ECC): minor corrections 2019-03-12 11:55:43 +01:00
Gilles Peskine
2de2c0d9ce Clarify deterministic generation by re-drawing
For DH, ECC (Weierstrass curves) and DSA, specify that the re-drawing
method is the one defined by NIST as
"key-pair generation by testing candidates", and describe it
unambiguously.

Also specify DES explicitly.
2019-03-11 18:10:07 +01:00
Gilles Peskine
fa4486d7ec Specify psa_generator_import_key for each key type
psa_generator_import_key() was only specified for "symmetric keys",
and there were some mistakes in the specification. Rewrite the
specification and extend it to other key types.

* For most private key types, specify that the function draws a byte
  string repeatedly until the byte string is suitable.
* For DES, despite being a symmetric key type, re-drawing is
  necessary.
* For Montgomery curves, despite being asymmetric, no re-drawing is
  necessary.
* Specify the behavior for every standard key type other than RSA.
  An implementation doesn't have to support all key types, but if it
  does, it's better to have a standard.
2019-03-11 17:30:31 +01:00
Gilles Peskine
3be6b7f553 Fix some copypasta in references to parameter names
Validated by

perl -ne 'if (/^\/\*\*/) {%param=(); @p=()} if (/\\param.*? (\w+)/) {$param{$1}=1} while (/\\p \*?(\w+)/g) {push @p,[$1,ARGV->input_line_number()]} if (/^\ \*\//) {foreach (@p) {if (!$param{$_->[0]}) {printf "%s:%d: bad \\p %s\n", $ARGV, $_->[1], $_->[0]}}} close ARGV if eof' include/psa/*.h
2019-03-11 15:11:31 +01:00
Gilles Peskine
ae2e5e0806 Remove copypasta'ed error reason in psa_aead_finish 2019-03-11 15:11:31 +01:00
Gilles Peskine
bf7a98b791 Fix typos found in PSA Crypto API 1.0 beta2 before publication 2019-02-22 16:42:11 +01:00
Jaeden Amero
7e2cda1d67
Merge pull request #11 from gilles-peskine-arm/psa-setup_bad_state-document
Document that multipart operation setup can return BAD_STATE
2019-02-19 10:24:23 +00:00
David Saada
b4ecc27629 Replace PSA error code definitions with the ones defined in PSA spec 2019-02-18 13:53:13 +02:00
Gilles Peskine
d338b91174 Fix some copypasta in one-shot hash and MAC function descriptions 2019-02-15 13:01:41 +01:00
Gilles Peskine
63f7930003 Doxygen: fix missing markup indicator that was causing broken links 2019-02-15 13:01:17 +01:00
Gilles Peskine
47e79fb5ab Fix minor errors in key derivation and key agreement documentation 2019-02-08 11:36:59 +01:00
Gilles Peskine
4c6fdbbe8d Fix typos in doxygen formatting commands 2019-02-08 11:36:59 +01:00
Gilles Peskine
aec5a7fd49 psa_copy_key: minor documentation clarification 2019-02-05 20:26:09 +01:00
Gilles Peskine
f603c718c9 New function psa_copy_key
Copy a key from one slot to another.

Implemented and smoke-tested.
2019-01-28 14:41:11 +01:00
Jaeden Amero
4d69cf1a84
Merge pull request #13 from Patater/pubkey-format
Simplify RSA and EC public key formats
2019-01-25 10:09:40 +00:00
Jaeden Amero
21fec0c1c5 psa: Expand documentation for psa_key_agreement()
Document `peer_key` parameter requirements, including an explanation of
how the peer key is used and an example for EC keys.
2019-01-23 17:39:46 +00:00
Jaeden Amero
ccdce90adb psa: Simplify EC public key format
Remove front matter from our EC key format, to make it just the contents
of an ECPoint as defined by SEC1 section 2.3.3.

As a consequence of the simplification, remove the restriction on not
being able to use an ECDH key with ECDSA. There is no longer any OID
specified when importing a key, so we can't reject importing of an ECDH
key for the purpose of ECDSA based on the OID.
2019-01-23 17:39:46 +00:00
Jaeden Amero
25384a236e psa: Simplify RSA public key format
Remove pkcs-1 and rsaEncryption front matter from RSA public keys. Move
code that was shared between RSA and other key types (like EC keys) to
be used only with non-RSA keys.
2019-01-23 17:31:50 +00:00
Jaeden Amero
494624d299
Merge pull request #18 from gilles-peskine-arm/psa-hash_clone
New function psa_hash_clone
2019-01-22 17:35:25 +00:00
Gilles Peskine
dad0832dc6 Merge branch 'psa-hash_clone' into psa-api-1.0-beta
Update the documentation of psa_hash_clone().
2019-01-21 14:54:59 +01:00
Gilles Peskine
e43aa39397 hash_clone: Fix copypasta and add a functional description 2019-01-21 14:50:37 +01:00
Gilles Peskine
ea2e3604b1 Merge branch 'psa-copy_key' into psa-api-1.0-beta
New function psa_copy_key().

Conflicts:
* library/psa_crypto.c: trivial conflicts due to consecutive changes.
* tests/suites/test_suite_psa_crypto.data: the same code
  was added on both sides, but with a conflict resolution on one side.
* tests/suites/test_suite_psa_crypto_metadata.function: the same code
  was added on both sides, but with a conflict resolution on one side.
2019-01-19 13:56:35 +01:00
Gilles Peskine
4cb9dde84a New function psa_copy_key
Copy a key from one slot to another.

Implemented and smoke-tested.
2019-01-19 13:46:36 +01:00
Gilles Peskine
b865df005c Merge branch 'psa-no_type_on_allocate_key' into psa-api-1.0-beta
Remove the type and bits arguments from psa_allocate_key() and
psa_create_key().
2019-01-19 12:24:18 +01:00
Gilles Peskine
d40c1fbd50 Don't require a type and size when creating a key slot
Remove the type and bits arguments to psa_allocate_key() and
psa_create_key(). They can be useful if the implementation wants to
know exactly how much space to allocate for the slot, but many
implementations (including ours) don't care, and it's possible to work
around their lack by deferring size-dependent actions to the time when
the key material is created. They are a burden to applications and
make the API more complex, and the benefits aren't worth it.

Change the API and adapt the implementation, the units test and the
sample code accordingly.
2019-01-19 12:20:52 +01:00
Gilles Peskine
b37af92eb9 Merge branch 'psa-hash_clone' into psa-api-1.0-beta
Add psa_hash_clone.
2019-01-19 12:07:27 +01:00
Gilles Peskine
ebb2c3e419 New function psa_hash_clone
Clone a hash operation.

Test good cases as part as multipart tests. Add new test functions for
the state machine.
2019-01-19 12:03:41 +01:00
Gilles Peskine
9dcc80e628 Merge branch 'psa-derive_input_steps-agreement_as_one_step' into psa-api-1.0-beta
Change the key derivation API to take inputs in multiple steps,
instead of a single one-site-fits-poorly function.

Conflicts:
* include/psa/crypto.h: merge independent changes in the documentation
  of psa_key_agreement (public_key from the work on public key formats
  vs general description and other parameters in the work on key derivation).
* tests/suites/test_suite_psa_crypto.data: update the key agreement
  tests from the work on key derivation to the format from the work on
  public key formats.
* tests/suites/test_suite_psa_crypto_metadata.function: reconcile the
  addition of unrelated ALG_IS_xxx macros
2019-01-18 18:54:15 +01:00
Gilles Peskine
6843c29713 Simplify the encoding of key agreement algorithms
Get rid of "key selection" algorithms (of which there was only one:
raw key selection).

Encode key agreement by combining a raw key agreement with a KDF,
rather than passing the KDF as an argument of a key agreement macro.
2019-01-18 18:38:08 +01:00
Gilles Peskine
769c7a66ac New function to get the raw shared secret from key agreement
The normal way is to pass the shared secret to a key derivation.
Having an ad hoc function will allow us to simplify the possible
behaviors of key agreement and get rid of "key selection" algorithms
which are a hard-to-understand invention of this API.
2019-01-18 18:38:08 +01:00
Gilles Peskine
5dcd3ce598 Remove psa_key_derivation from the official API
Keep it defined as an implementation-specific extension until the
tests are updated.
2019-01-18 18:38:08 +01:00
Gilles Peskine
969c5d61f7 Make key agreement the secret input for key derivation
* Documentation
* Proof-of-concept implementation
* Updates to the tests (work in progress)
2019-01-18 18:34:28 +01:00
Gilles Peskine
6cdfdb75a9 Improve the rules on key derivation input types
Use separate step types for a KDF secret and for the private key in a
key agreement.

Determine which key type is allowed from the step type, independently
of the KDF.

Forbid raw inputs for certain steps. They definitely should be
forbidden for asymmetric keys, which are structured. Also forbid them
for KDF secrets: the secrets are supposed to be keys, even if they're
unstructured.
2019-01-18 18:33:12 +01:00
Gilles Peskine
b70a0fd1a5 Key derivation by small input steps: proof-of-concept
Document the new API. Keep the old one.

Implement for HKDF. Use it in a few test cases.

Key agreement is still unchanged.
2019-01-18 18:33:12 +01:00
Gilles Peskine
7666edbfe1 Merge branch 'psa-aead_multipart' into psa-api-1.0-beta
Add multipart AEAD API.

Add one-shot API for hash, MAC and cipher.
2019-01-18 17:59:30 +01:00
Gilles Peskine
3a74e00429 Add type argument to psa_set_key_domain_parameters
psa_set_key_domain_parameters needs the type to parse the domain
parameters.
2019-01-18 17:24:20 +01:00
Jaeden Amero
8851c40d85 psa: Add DH key exchange keys
Add the ability to specify Diffie-Hellman key exchange keys. Specify the
import/export format as well, even though importing and exporting isn't
implemented yet.
2019-01-18 17:24:20 +01:00
Jaeden Amero
1308fb517f psa: Simplify DSA key formats
Remove front matter and DSS parameters from our DSA key formats, both
keypair and public key, to make it just a representation of the integer
private key, `x`, or the public key, `y`, respectively.
2019-01-18 17:24:20 +01:00
Jaeden Amero
283dfd1613 psa: Add get/set domain parameters
DSA and static DH need extra domain parameters. Instead of passing these
in with the keys themselves, add get and set functions to set and
retrieve this information about keys.
2019-01-18 17:19:54 +01:00
Gilles Peskine
bc59c855c4 Doc only: Add psa_aead_set_lengths() for the sake of CCM 2019-01-17 15:26:08 +01:00
Gilles Peskine
a05602d100 Fix typos in recently-added documentation 2019-01-17 15:25:52 +01:00
Jaeden Amero
8afbff82dd psa: Expand documentation for psa_key_agreement()
Document `peer_key` parameter requirements, including an explanation of
how the peer key is used and an example for EC keys.
2019-01-15 11:29:19 +00:00
Jaeden Amero
0ae445f8fd psa: Simplify EC public key format
Remove front matter from our EC key format, to make it just the contents
of an ECPoint as defined by SEC1 section 2.3.3.

As a consequence of the simplification, remove the restriction on not
being able to use an ECDH key with ECDSA. There is no longer any OID
specified when importing a key, so we can't reject importing of an ECDH
key for the purpose of ECDSA based on the OID.
2019-01-15 11:29:18 +00:00
Gilles Peskine
69647a45a3 Declare one-shot hash, MAC and cipher functions
Declare and document one-shot hash, MAC and cipher functions.

This commit does not contain any implementation or tests.
2019-01-14 20:18:12 +01:00
Gilles Peskine
30a9e41076 Declare multipart AEAD functions
Declare and document multipart AEAD functions.

This commit does not contain any implementation or tests.
2019-01-14 18:36:12 +01:00
Gilles Peskine
f45adda9ac Copyedit the documentation of multipart operation functions
Finish changing "start" to "set up".

Correct the way to set an IV for decryption: it's set_iv(), not
update().

When decrypting, the IV is given, not random.
2019-01-14 18:29:46 +01:00
Gilles Peskine
5f25dd00c0 Document that destroying a key aborts any ongoing operation
Document that psa_close_key() and psa_destroy_key() abort any ongoing
multipart operation that is using the key. This is not implemented
yet.
2019-01-14 18:29:46 +01:00
Jaeden Amero
6b19600fba psa: Simplify RSA public key format
Remove pkcs-1 and rsaEncryption front matter from RSA public keys. Move
code that was shared between RSA and other key types (like EC keys) to
be used only with non-RSA keys.
2019-01-11 18:08:53 +00:00
Jaeden Amero
d3a0c2c779 psa: Document requirements for psa_export_public_key()
Copy the nice and clear documentation from psa_export_key() as to what
implementations are allowed to do regarding key export formats, as the
same applies to public keys.
2019-01-11 17:15:56 +00:00
Gilles Peskine
8e1addc710 Document BAD_STATE errors for multipart operation setup functions
Future commits will implement this and add tests.
2019-01-10 11:51:17 +01:00
Gilles Peskine
76d7bfeb0c Terminology: consistently use "set up" for multipart operations
hash_setup and mac_setup used to be called hash_start and mac_start,
but we've now converged on _setup as names. Finish making the
terminology in the documentation consistent.
2019-01-10 11:47:49 +01:00
Jaeden Amero
9e919c636f psa: Document generator requirements consistently
We've added documentation for how context objects for multi-part
operations must be initialized consistently for key policy, hash,
cipher, and MAC. Update the generator documentation to be consistent
with how we've documented the other operations.
2019-01-08 14:28:04 +00:00
Jaeden Amero
5bae227da0 psa: Add initializers for cipher operation objects
Add new initializers for cipher operation objects and use them in our
tests and library code. Prefer using the macro initializers due to their
straightforwardness.
2019-01-08 14:28:04 +00:00
Jaeden Amero
769ce27f12 psa: Add initializers for MAC operation objects
Add new initializers for MAC operation objects and use them in our tests
and library code. Prefer using the macro initializers due to their
straightforwardness.
2019-01-08 14:28:04 +00:00
Jaeden Amero
6a25b41ac3 psa: Add initializers for hash operation objects
Add new initializers for hash operation objects and use them in our
tests and library code. Prefer using the macro initializers due to their
straightforwardness.
2019-01-08 14:28:04 +00:00
Jaeden Amero
70261c513a psa: Add initializers for key policies
Add new initializers for key policies and use them in our docs, example
programs, tests, and library code. Prefer using the macro initializers
due to their straightforwardness.
2019-01-08 14:28:04 +00:00
Gilles Peskine
a7c26db335 Move remaining size macros from crypto.h to crypto_sizes.h
No functional changes, code was only moved from crypto.h to crypto_sizes.h.
2018-12-21 17:53:12 +01:00
Gilles Peskine
f3b731e817 Move integral types and associated macros to their own header
Some parts of the library, and crypto drivers, need to see key types,
algorithms, policies, etc. but not API functions. Move portable
integral types and macros to build and analyze values of these types
to a separate headers crypto_types.h and crypto_values.h.

No functional changes, code was only moved from crypto.h to the new headers.
2018-12-21 17:53:09 +01:00
Gilles Peskine
0344d8171d Simplify the SPM compatibility hack
Define psa_status_t to int32_t unconditionally. There's no reason to
refer to psa_error_t here: psa_error_t is int32_t if it's present. We
would only need a conditional definition if psa_defs.h and
psa_crypto.h used the same type name.

Keep the conditional definition of PSA_SUCCESS. Although the C
preprocessor allows a duplicate definition for a macro, it has to be
the exact same token sequence, not merely an equivalent way to build
the same value.
2018-12-20 20:09:04 +01:00
Gilles Peskine
23fd2bdb94 Update some documentation related to key slots
Some of the documentation is obsolete in its reference to key slots
when it should discuss key handles. This may require a further pass,
possibly with some reorganization of error codes.

Update the documentation of functions that modify key slots (key
material creation and psa_set_key_policy()) to discuss how they affect
storage.
2018-12-11 16:48:14 +01:00
Gilles Peskine
b77a6b25c0 Remove psa_set_key_lifetime
This function is no longer relevant. Use psa_create_key instead.
2018-12-11 16:48:13 +01:00
Gilles Peskine
ae32aac48e Switch function declarations from key slots to key handles
Replace `psa_key_slot_t key` by `psa_key_handle_t` in function
declarations.

This is a transition period during which handles are key slot numbers
and the whole library can still be used by accessing a key slot number
without allocating a handle.
2018-12-11 16:48:10 +01:00
Gilles Peskine
644cd5fd89 Linkify some macros that were just typeset as text 2018-12-11 16:47:35 +01:00
Gilles Peskine
f535eb2e61 Declare the new slot management functions in crypto.h
No changes to existing functions.
2018-12-11 16:06:51 +01:00
Gilles Peskine
3cac8c4d78 Move declarations related to lifetimes further up in crypto.h
No content change. This is in preparation for declaring the slot
management functions, which need the type psa_key_lifetime_t.
2018-12-05 09:40:07 +01:00
Darryl Green
d49a499d03 psa: Implement persistent keys
Allow use of persistent keys, including configuring them, importing and
exporting them, and destroying them.

When getting a slot using psa_get_key_slot, there are 3 scenarios that
can occur if the keys lifetime is persistent:

1. Key type is PSA_KEY_TYPE_NONE, no persistent storage entry:
   -  The key slot is treated as a standard empty key slot
2. Key type is PSA_KEY_TYPE_NONE, persistent storage entry exists:
   -  Attempt to load the key from persistent storage
3. Key type is not PSA_KEY_TYPE_NONE:
   -  As checking persistent storage on every use of the key could
      be expensive, the persistent key is assumed to be saved in
      persistent storage, the in-memory key is continued to be used.
2018-11-20 15:40:25 +00:00
Hanno Becker
2255a360a6 Improve documentation of TLS-1.2 PRF and PSK-to-MS KDF 2018-11-19 11:24:26 +00:00
Hanno Becker
8dbfca4628 Add TLS-1.2 PSK-to-MS key derivation algorithm identifier to PSA API 2018-11-19 11:24:21 +00:00
Gilles Peskine
19643c573d Fix typo in documentation
tests/scripts/doxygen.sh passes.
2018-11-16 16:45:02 +01:00
Hanno Becker
79250c255f Add identifiers for TLS-1.2 PRF
This commit adds KDF algorithm identifiers `PSA_ALG_TLS12_PRF(HASH)`
to the PSA crypto API. They represent the key derivation functions
used by TLS 1.2 for the PreMasterSecret->MasterSecret and
MasterSecret->KeyBlock conversions.
2018-11-16 11:12:01 +00:00
Gilles Peskine
99d0259987 Improve documentation the shared secret format for FFDH 2018-11-15 17:48:15 +01:00
Gilles Peskine
d171e78b46 Document the peer_key format for psa_key_agreement 2018-11-15 17:48:15 +01:00
Gilles Peskine
6c6a023f99 More tweaks on EC-related wording
Use m for the bit size of the field order, not q which is
traditionally the field order.

Correct and clarify the private key representation format as has been
done for the private key and ECDH shared secret formats.
2018-11-15 17:48:15 +01:00
Gilles Peskine
7b5b4a01a4 Correct description of the ECDH shared secret
The endianness actually depends on the curve type.

Correct the terminology around "curve size" and "order of the curve".
I tried to find a formulation that is comprehensible to programmers
who do not know the underlying mathematics, but nonetheless correct
and precise.

Use similar terminology in other places that were using "order of the
curve" to describe the bit size associated with the curve.
2018-11-14 21:17:16 +01:00
Gilles Peskine
f5f442a50c More accurate description of the shared secret for ECDH
Don't refer to the "curve size", call it the "size of the order of the
curve".
2018-11-14 21:17:16 +01:00
Gilles Peskine
211a436f2e Document that key agreement produces a maximum-capacity generator 2018-11-14 21:15:37 +01:00
Gilles Peskine
79dd6229e4 Clarify the format of the (EC)DH shared secret 2018-11-14 21:15:37 +01:00
Gilles Peskine
2607bca666 Give "DH" and "DHM" as alternative names
Be consistent about calling it just "Diffie-Hellman", except once
where I state that "Diffie-Hellman-Merkle" is an alternative name.
2018-11-14 21:15:37 +01:00
Gilles Peskine
01d718cee8 New API function: psa_key_agreement
Set up a generator from a key agreement.
2018-11-14 21:15:37 +01:00
Gilles Peskine
8feb3a886d Support key derivation with non-predefined capacity
psa_key_derivation requires the caller to specify a maximum capacity.
This commit adds a special value that indicates that the maximum
capacity should be the maximum supported by the algorithm. This is
currently meant only for selection algorithms used on the shared
secret produced by a key agreement.
2018-11-14 21:15:37 +01:00
Gilles Peskine
93098fd996 Key agreement: macros for finite-field Diffie-Hellman, ECDH
Declare macros to represent key agreement algorithms.
2018-11-14 21:15:37 +01:00
Gilles Peskine
e8f0e3dc3c New algorithm category: key selection
A key selection algorithm is similar to a key derivation algorithm in
that it takes a secret input and produces a secret output stream.
However, unlike key derivation algorithms, there is no expectation
that the input cannot be reconstructed from the output. Key selection
algorithms are exclusively meant to be used on the output of a key
agreement algorithm to select chunks of the shared secret.
2018-11-14 21:15:37 +01:00
Gilles Peskine
92587dbf2b Write missing bit of the documentation of psa_key_derivation 2018-11-14 21:15:37 +01:00
Gilles Peskine
f7933939b3 Expand the documentation of import/export formats
Clarify that the key type determines the syntax of the input.

Clarify the constraints on implementations that support extra import
formats.
2018-10-31 14:10:07 +01:00
Gilles Peskine
f76aa7789b Private EC key format: change to raw secret value (doc, import)
Change the import/export format of private elliptic curve keys from
RFC 5915 to the raw secret value. This commit updates the format
specification and the import code, but not the export code.
2018-10-31 14:10:06 +01:00
Gilles Peskine
e0e9c7c417 New macro PSA_ALG_FULL_LENGTH_MAC
Provide a documented way of constructing the full-length MAC algorithm
from a truncated version.
2018-10-17 18:30:47 +02:00
Gilles Peskine
6d72ff9e79 Document that the minimum truncated MAC length is implementation-defined 2018-10-17 13:54:47 +02:00
Gilles Peskine
e1f2d7d1ac Document and check the consistency of truncated MAC encodings
Add comments noting that the maximum length of a MAC must fit in
PSA_ALG_MAC_TRUNCATION_MASK. Add a unit test that verifies that the
maximum MAC size fits.
2018-10-17 13:54:47 +02:00
Gilles Peskine
3111981d94 Fix parameter name in Doxygen documentation 2018-10-08 14:45:35 +02:00
Gilles Peskine
70f46e17e8 New macro PSA_ALG_AEAD_WITH_DEFAULT_TAG_LENGTH
Useful to analyze algorithm values.
2018-10-08 14:45:35 +02:00
Gilles Peskine
23cc2ff9a8 Add support for non-default-tag-size AEAD (CCM and GCM) 2018-10-08 14:42:11 +02:00
Gilles Peskine
d911eb7915 Add support for truncated MAC algorithms 2018-10-08 14:42:11 +02:00
Gilles Peskine
159ebf3b8e
Merge pull request #142 from ARMmbed/psa-metadata_validation
Algorithm and key type encoding validation
2018-09-24 10:38:39 +02:00
Jaeden Amero
40363fe3f5
Merge pull request #139 from ARMmbed/psa-PSA_ALG-block_cipher_padding
Correct and simplify block-based cipher modes
2018-09-21 09:38:27 +01:00
Gilles Peskine
00709fafb8 Rename PSA_ALG_HMAC_HASH to PSA_ALG_HMAC_GET_HASH
Be consistent with other GET_HASH macros.
2018-09-20 12:00:21 +02:00
Gilles Peskine
9df2dc87ab Fix name of PSA_ALG_IS_BLOCK_CIPHER_MAC
The macro was used under the name PSA_ALG_IS_BLOCK_CIPHER_MAC but
defined as PSA_ALG_IS_CIPHER_MAC. That wouldn't have worked if we used
this macro (we currently don't but it may become useful).
2018-09-20 12:00:21 +02:00
Gilles Peskine
70ce2c6170 FFDHE groups are not elliptic curves
TLS now defines named curves in the "TLS Supported Groups registry",
but we're using the encoding only for elliptic curves, so don't
include values that aren't named curve.

While we're at it, upgrade the reference to the shiny new RFC 8422.
2018-09-20 12:00:21 +02:00
Gilles Peskine
583b55d97d Add PSA_KEY_TYPE_IS_DSA to go with PSA_KEY_TYPE_IS_RSA
Also move PSA_KEY_TYPE_IS_RSA to a more logical location.
2018-09-20 12:00:21 +02:00
Gilles Peskine
daea26f70f Correct and simplify block-based cipher modes
OFB and CFB are streaming modes. XTS is a not a cipher mode but it
doesn't use a separate padding step. This leaves only CBC as a block
cipher mode that needs a padding step.

Since CBC is the only mode that uses a separate padding step, and is
likely to remain the only mode in the future, encode the padding mode
directly in the algorithm constant, rather than building up an
algorithm value from a chaining mode and a padding mode. This greatly
simplifies the interface as well as some parts of the implementation.
2018-09-20 11:58:22 +02:00
itayzafrir
1861709e5c Add documentation describing behavior of not calling psa_crypto_init 2018-09-16 12:42:53 +03:00
itayzafrir
90d8c7a728 Ensure the module is initialized in key based functions 2018-09-16 12:15:47 +03:00
itayzafrir
0adf0fc31c Ensure the module is initialized in psa_generate_random 2018-09-16 12:15:46 +03:00
Gilles Peskine
c6290c043e Minor documentation improvements 2018-09-14 10:02:29 +01:00
Gilles Peskine
4f6c77b0a9 fixup format spec 2018-09-14 10:02:29 +01:00
Gilles Peskine
1be949b846 New macro PSA_KEY_EXPORT_MAX_SIZE
Sufficient buffer size for psa_export_key() and psa_export_public_key().
2018-09-14 10:02:29 +01:00
Gilles Peskine
4e1e9beb56 Define the encoding of ECC and DSA keys 2018-09-14 10:02:29 +01:00
Gilles Peskine
e877974794 Move key type feature test macros to a more logical place 2018-09-14 10:02:29 +01:00
Gilles Peskine
78b3bb670d Change the bitwise encoding of key type categories
There were only 5 categories (now 4). Reduce the category mask from 7
bits to 3.

Combine unformatted, not-necessarily-uniform keys (HMAC, derivation)
with raw data.

Reintroduce a KEY_TYPE_IS_UNSTRUCTURED macro (which used to exist
under the name KEY_TYPE_IS_RAW_DATA macro) for key types that don't
have any structure, including both should-be-uniform keys (such as
block cipher and stream cipher keys) and not-necessarily-uniform
keys (such as HMAC keys and secrets for key derivation).
2018-09-14 10:02:29 +01:00
Jaeden Amero
5ac5cec9a2 Merge pull request #127 from ARMmbed/documentation-update
Update documentation due to function renaming
2018-09-14 10:02:29 +01:00
itayzafrir
ed7382f6a7 Update documentation due to function renaming 2018-09-14 10:02:29 +01:00
mohammad1603
13f43948f3 typo fix 2018-09-14 10:02:29 +01:00
itayzafrir
f26dbfc096 Rearrange PSA_ERROR_XXX error codes
Set PSA_ERROR_UNKNOWN_ERROR as the first error code to prevent the
need to change its value whenever a new error code is added.
2018-09-14 10:02:29 +01:00
Darryl Green
9e2d7a09f1 Add ifdefs for psa_internal_export_key function
MBEDTLS_PK_WRITE_C only requires either MBEDTLS_RSA_C or MBEDTLS_ECP_C to be defined.
Added wrappers to handle the cases where only one has been defined.
Moved mbedtls_pk_init to be within the ifdefs, so it's only called if appropriate.
2018-09-14 10:02:28 +01:00
Darryl Green
8800136156 Fix key parameter in psa_key_derivation to use correct type 2018-09-14 10:02:28 +01:00
Jaeden Amero
cab5494b12 psa: Add license header to crypto.h 2018-09-14 10:02:28 +01:00
Gilles Peskine
edd768775f Fix doxygen warnings
* Broken link #PSA_ALG_SHA_256
* Duplicate group name "generators"
* Missing documentation in psa_generate_key_extra_rsa due to bad magic
  comment marker
2018-09-12 16:50:07 +03:00
Gilles Peskine
9f900a8b25 Merge pull request #105 from ARMmbed/psa-derive_hkdf
PSA key derivation: simple-ish interface, HKDF
2018-09-12 16:50:07 +03:00
Gilles Peskine
9fb0e01177 Fix nonstandard whitespace 2018-09-12 16:50:07 +03:00
Gilles Peskine
bef7f14f8e Implement HKDF 2018-09-12 16:44:05 +03:00
Gilles Peskine
ea0fb4975c Add framework for simple key derivation
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.
2018-09-12 16:44:04 +03:00
Gilles Peskine
eab56e4159 Add generator API
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.
2018-09-12 16:41:12 +03:00
Gilles Peskine
55728b0e70 Add a few key type and algorithm test macros
These new PSA_xxx_IS_yyy macros fill a few missing gaps.
2018-09-12 16:41:12 +03:00
Gilles Peskine
3bd1a42203 Remove duplicate definition of PSA_KEY_TYPE_IS_RSA 2018-09-12 16:41:12 +03:00
Gilles Peskine
072ac56a03 Implement OAEP
Implement RSAES-OAEP encryption and decryption.

Test it to the same level as PKCS#1 v1.5.
2018-09-12 16:41:12 +03:00
Gilles Peskine
a4d20bd387 For RSA PSS, document that salt length = hash length
This is the most common mode and the only mode that Mbed TLS functions
fully supports (mbedtls_rsa_rsassa_pss_verify_ext can verify
signatures with a different salt length).
2018-09-12 16:41:12 +03:00
Gilles Peskine
b82ab6f402 Improve documentation of abort functions
Explicitly state that calling abort is safe after initializing to
zero.

Explicitly state that calling abort on an inactive operation is safe,
and replace "active" by "initialized" in the description of the
parameter.

Get rid of the recommendation for implementers to try to handle
uninitialized structures safely. It's good advice in principle but
cannot be achieved in a robust way and the wording was confusing.
2018-09-12 16:41:11 +03:00
Gilles Peskine
54622aec80 Fix PSA_ALG_SIGN_GET_HASH for PSA_ALG_SIGN_xxx_RAW 2018-09-12 16:41:11 +03:00
Gilles Peskine
be42f312a8 Doxygen: use \c foo in preference to foo for consistency 2018-09-12 16:41:11 +03:00
Gilles Peskine
9ac9426731 Doc: clarify the preconditions for psa_cipher_update 2018-09-12 16:41:11 +03:00
Gilles Peskine
6ac73a912b Doc: add some missing documentation of function and macro parameters 2018-09-12 16:41:11 +03:00
Gilles Peskine
dda3bd344d Doc: Minor formatting and copy fixes 2018-09-12 16:41:11 +03:00
Gilles Peskine
d8008d6dfe New macro PSA_KEY_TYPE_IS_RSA 2018-09-12 16:41:11 +03:00
Gilles Peskine
fa4070c50b Doc: Fix some \c name that should have been \p name 2018-09-12 16:41:11 +03:00
Gilles Peskine
3fa675cd97 Doc: generate_key: improve documentation of \p extra 2018-09-12 16:41:11 +03:00
Gilles Peskine
4c317f4b4c generate_key: define a structure type for RSA extra parameters 2018-09-12 16:41:11 +03:00
Gilles Peskine
53d991e655 generate_key: rename \p parameters to \p extra
\p parameters is a confusing name for a function parameter. Rename it
to \p extra.
2018-09-12 16:41:11 +03:00
Gilles Peskine
edd11a14aa Doc: add [in] or [out] annotations to pointer arguments 2018-09-12 16:41:11 +03:00
Gilles Peskine
aa7bc47f73 Add missing const on policy_get_xxx function parameter 2018-09-12 16:41:11 +03:00
Gilles Peskine
3ff2162d14 Remove salt from asymmetric_{sign,verify}
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.
2018-09-12 16:41:11 +03:00
Gilles Peskine
7256e6c9a4 Doc: fix formatting of some macro arguments in explanations 2018-09-12 16:41:11 +03:00
Gilles Peskine
dcd1494327 Doc: write documentation for many macros and functions
As of this commit, all #identifier links in the documentation are resolved.
2018-09-12 16:41:11 +03:00
Gilles Peskine
5ce3e59dfe Doc: PSA_ALG_IS_HASH is unspecified if alg is not *supported* 2018-09-12 16:41:11 +03:00
Gilles Peskine
5d1888ebc5 Rename PSA_ALG_STREAM_CIPHER -> PSA_ALG_STREAM_CIPHER_BASE
Follow the usual naming convention: PSA_ALG_xxx_BASE for a constant
that isn't an algorithm, just used to build one.
2018-09-12 16:41:11 +03:00
Gilles Peskine
2853849498 Doxygen: linkify references to macro names 2018-09-12 16:41:11 +03:00
Gilles Peskine
61a60376b7 Fix misplaced Doxygen comment 2018-09-12 16:41:11 +03:00
Gilles Peskine
fe11951c16 Rename psa cipher functions to psa_cipher_xxx
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
2018-09-12 16:41:11 +03:00
Gilles Peskine
89167cb597 Split psa_mac_setup -> psa_mac_{sign,verify}_setup
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.
2018-09-12 16:41:11 +03:00
Gilles Peskine
acd4be36fa Rename psa_mac_{finish,verify} -> psa_mac_{sign,verify}_finish
Make function names for multipart operations more consistent (MAC
finish edition).
2018-09-12 16:41:11 +03:00
Gilles Peskine
da8191d1cd Rename psa_hash_start -> psa_hash_setup
Make function names for multipart operations more consistent (hash
edition).
2018-09-12 16:41:11 +03:00
Gilles Peskine
2743e42580 Correct reference for RSA keypair export format 2018-09-12 16:41:11 +03:00
Gilles Peskine
49cee6c582 Move implementation-dependent size macros to crypto_sizes.h
Macros such as PSA_HASH_SIZE whose definitions can be the same
everywhere except in implementations that support non-standard
algorithms remain in crypto.h, at least for the time being.
2018-09-12 16:41:11 +03:00
Gilles Peskine
0cad07c2fb New header crypto_sizes.h
This header will contain macros that calculate buffer sizes, whose
semantics are standardized but whose definitions are
implementation-specific because they depend on the available algorithms
and on some permitted buffer size tolerances.

Move size macros from crypto_struct.h to crypto_sizes.h, because these
definitions need to be available both in the frontend and in the
backend, whereas structures have different contents.
2018-09-12 16:41:11 +03:00
Gilles Peskine
eae6eee24c Change ECDSA signature representation to r||s
Change the representation of an ECDSA signature from the ASN.1 DER
encoding used in TLS and X.509, to the concatenation of r and s
in big-endian order with a fixed size. A fixed size helps memory and
buffer management and this representation is generally easier to use
for anything that doesn't require the ASN.1 representation. This is
the same representation as PKCS#11 (Cryptoki) except that PKCS#11
allows r and s to be truncated (both to the same length), which
complicates the implementation and negates the advantage of a
fixed-size representation.
2018-09-12 16:41:11 +03:00
Gilles Peskine
a81d85b732 Sort out ECDSA mechanisms
* Distinguish randomized ECDSA from deterministic ECDSA.
* Deterministic ECDSA needs to be parametrized by a hash.
* Randomized ECDSA only uses the hash for the initial hash step,
  but add ECDSA(hash) algorithms anyway so that all the signature
  algorithms encode the initial hashing step.
* Add brief documentation for the ECDSA signature mechanisms.
* Also define DSA signature mechanisms while I'm at it. There were
  already key types for DSA.
2018-09-12 16:24:51 +03:00
Gilles Peskine
526fab0066 Fix parameter name signature_size for psa_asymmetric_verify
It should have been signature_length, following our conventions.
2018-09-12 16:24:51 +03:00
Gilles Peskine
e9191ff90b Add missing const for signature parameter of psa_asymmetric_verify 2018-09-12 16:24:51 +03:00
Gilles Peskine
08bac713df Clarify that asymmetric_{sign,verify} operate on a hash 2018-09-12 16:24:51 +03:00
Gilles Peskine
55bf3d1171 Sort out RSA mechanisms
* PSS needs to be parametrized by a hash.
* Don't use `_MGF1` in the names of macros for OAEP and PSS. No one
  ever uses anything else.
* Add brief documentation for the RSA signature mechanisms.
2018-09-12 16:24:51 +03:00
Gilles Peskine
9e73ff17d4 Add missing parameters to some documentation
tests/scripts/doxygen.sh now passes.
2018-09-12 16:24:50 +03:00
Gilles Peskine
ea4469f8d1 Fix parameter name in Doxygen documentation 2018-09-12 16:24:50 +03:00
Gilles Peskine
7ed29c56f1 Rename PSA_ALG_RSA_GET_HASH to PSA_ALG_SIGN_GET_HASH
And don't use it for HMAC when there's a perfectly serviceable
PSA_ALG_HMAC_HASH. HMAC isn't hash-and-sign.
2018-09-12 16:24:50 +03:00
Jaeden Amero
7baf0d5702 psa: doxygen: Fix parameters reference
Doxygen interprets `\param` as starting documentation for a new param, or
to extend a previously started `\param` documentation when the same
reference is used. The intention here was to reference the function
parameter, not extend the previous documentation. Use `\p` to refer to
function parameters.
2018-09-12 16:24:50 +03:00