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New algorithm PSA_ALG_RSA_PSS_ANY_SALT

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This is a variant of PSA_ALG_RSA_PSS which currently has exactly the same
behavior, but is intended to have a different behavior when verifying
signatures.

In a subsequent commit, PSA_ALG_RSA_PSS will change to requiring the salt
length to be what it would produce when signing, as is currently documented,
whereas PSA_ALG_RSA_PSS_ANY_SALT will retain the current behavior of
allowing any salt length (including 0).

Changes in this commit:

* New algorithm constructor PSA_ALG_RSA_PSS_ANY_SALT.
* New predicates PSA_ALG_IS_RSA_PSS_STANDARD_SALT (corresponding to
  PSA_ALG_RSA_PSS) and PSA_ALG_IS_RSA_PSS_ANY_SALT (corresponding to
  PSA_ALG_RSA_PSS_ANY_SALT).
* Support for the new predicates in macro_collector.py (needed for
  generate_psa_constant_names).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-10-04 18:10:38 +02:00
parent 3545103fd4
commit 35115f9c1a
6 changed files with 245 additions and 3 deletions
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68
include/psa/crypto_values.h
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@ -833,7 +833,7 @@
* algorithm parametrized with any supported hash.
*
* That is, suppose that `PSA_xxx_SIGNATURE` is one of the following macros:
* - #PSA_ALG_RSA_PKCS1V15_SIGN, #PSA_ALG_RSA_PSS,
* - #PSA_ALG_RSA_PKCS1V15_SIGN, #PSA_ALG_RSA_PSS, #PSA_ALG_RSA_PSS_ANY_SALT,
* - #PSA_ALG_ECDSA, #PSA_ALG_DETERMINISTIC_ECDSA.
* Then you may create and use a key as follows:
* - Set the key usage field using #PSA_ALG_ANY_HASH, for example:
@ -1289,6 +1289,7 @@
(((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_PKCS1V15_SIGN_BASE)
#define PSA_ALG_RSA_PSS_BASE ((psa_algorithm_t)0x06000300)
#define PSA_ALG_RSA_PSS_ANY_SALT_BASE ((psa_algorithm_t)0x06001300)
/** RSA PSS signature with hashing.
*
* This is the signature scheme defined by RFC 8017
@ -1309,9 +1310,72 @@
*/
#define PSA_ALG_RSA_PSS(hash_alg) \
(PSA_ALG_RSA_PSS_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
#define PSA_ALG_IS_RSA_PSS(alg) \
/** RSA PSS signature with hashing with relaxed verification.
*
* This algorithm has the same behavior as #PSA_ALG_RSA_PSS when signing,
* but allows an arbitrary salt length (including \c 0) when verifying a
* signature.
*
* \param hash_alg A hash algorithm (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_HASH(\p hash_alg) is true).
* This includes #PSA_ALG_ANY_HASH
* when specifying the algorithm in a usage policy.
*
* \return The corresponding RSA PSS signature algorithm.
* \return Unspecified if \p hash_alg is not a supported
* hash algorithm.
*/
#define PSA_ALG_RSA_PSS_ANY_SALT(hash_alg) \
(PSA_ALG_RSA_PSS_ANY_SALT_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
/** Whether the specified algorithm is RSA PSS with standard salt.
*
* \param alg An algorithm value or an algorithm policy wildcard.
*
* \return 1 if \p alg is of the form
* #PSA_ALG_RSA_PSS(\c hash_alg),
* where \c hash_alg is a hash algorithm or
* #PSA_ALG_ANY_HASH. 0 otherwise.
* This macro may return either 0 or 1 if \p alg is not
* a supported algorithm identifier or policy.
*/
#define PSA_ALG_IS_RSA_PSS_STANDARD_SALT(alg) \
(((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_PSS_BASE)
/** Whether the specified algorithm is RSA PSS with any salt.
*
* \param alg An algorithm value or an algorithm policy wildcard.
*
* \return 1 if \p alg is of the form
* #PSA_ALG_RSA_PSS_ANY_SALT_BASE(\c hash_alg),
* where \c hash_alg is a hash algorithm or
* #PSA_ALG_ANY_HASH. 0 otherwise.
* This macro may return either 0 or 1 if \p alg is not
* a supported algorithm identifier or policy.
*/
#define PSA_ALG_IS_RSA_PSS_ANY_SALT(alg) \
(((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_PSS_ANY_SALT_BASE)
/** Whether the specified algorithm is RSA PSS.
*
* This includes any of the RSA PSS algorithm variants, regardless of the
* constraints on salt length.
*
* \param alg An algorithm value or an algorithm policy wildcard.
*
* \return 1 if \p alg is of the form
* #PSA_ALG_RSA_PSS(\c hash_alg) or
* #PSA_ALG_RSA_PSS_ANY_SALT_BASE(\c hash_alg),
* where \c hash_alg is a hash algorithm or
* #PSA_ALG_ANY_HASH. 0 otherwise.
* This macro may return either 0 or 1 if \p alg is not
* a supported algorithm identifier or policy.
*/
#define PSA_ALG_IS_RSA_PSS(alg) \
((((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_PSS_BASE) || \
(((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_PSS_ANY_SALT_BASE))
#define PSA_ALG_ECDSA_BASE ((psa_algorithm_t)0x06000600)
/** ECDSA signature with hashing.
*