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New macro PSA_ALG_IS_HASH_AND_SIGN

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Test for a subclass of public-key algorithm: those that perform
full-domain hashing, i.e. algorithms that can be broken down as
sign(key, hash(message)).
This commit is contained in:
Gilles Peskine 2019-01-14 16:02:15 +01:00
parent d40c1fbd50
commit b66c27b2c9
3 changed files with 32 additions and 14 deletions
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20
include/psa/crypto_values.h
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@ -1046,6 +1046,23 @@
#define PSA_ALG_IS_RANDOMIZED_ECDSA(alg) \
(PSA_ALG_IS_ECDSA(alg) && !PSA_ALG_ECDSA_IS_DETERMINISTIC(alg))
/** Whether the specified algorithm is a hash-and-sign algorithm.
*
* Hash-and-sign algorithms are public-key signature algorithms structured
* in two parts: first the calculation of a hash in a way that does not
* depend on the key, then the calculation of a signature from the
* hash value and the key.
*
* \param alg An algorithm identifier (value of type #psa_algorithm_t).
*
* \return 1 if \p alg is a hash-and-sign algorithm, 0 otherwise.
* This macro may return either 0 or 1 if \p alg is not a supported
* algorithm identifier.
*/
#define PSA_ALG_IS_HASH_AND_SIGN(alg) \
(PSA_ALG_IS_RSA_PSS(alg) || PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) || \
PSA_ALG_IS_DSA(alg) || PSA_ALG_IS_ECDSA(alg))
/** Get the hash used by a hash-and-sign signature algorithm.
*
* A hash-and-sign algorithm is a signature algorithm which is
@ -1065,8 +1082,7 @@
* if it is not supported by the implementation.
*/
#define PSA_ALG_SIGN_GET_HASH(alg) \
(PSA_ALG_IS_RSA_PSS(alg) || PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) || \
PSA_ALG_IS_DSA(alg) || PSA_ALG_IS_ECDSA(alg) ? \
(PSA_ALG_IS_HASH_AND_SIGN(alg) ? \
((alg) & PSA_ALG_HASH_MASK) == 0 ? /*"raw" algorithm*/ 0 : \
((alg) & PSA_ALG_HASH_MASK) | PSA_ALG_CATEGORY_HASH : \
0)