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New macro PSA_ALG_FULL_LENGTH_MAC

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Provide a documented way of constructing the full-length MAC algorithm
from a truncated version.
This commit is contained in:
Gilles Peskine
2018-10-17 18:28:05 +02:00
parent 57fbdb1939
commit e0e9c7c417
3 changed files with 18 additions and 1 deletions
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15
include/psa/crypto.h
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@ -803,6 +803,21 @@ typedef uint32_t psa_algorithm_t;
(((alg) & ~PSA_ALG_MAC_TRUNCATION_MASK) | \
((mac_length) << PSA_MAC_TRUNCATION_OFFSET & PSA_ALG_MAC_TRUNCATION_MASK))
/** Macro to build the base MAC algorithm corresponding to a truncated
* MAC algorithm.
*
* \param alg A MAC algorithm identifier (value of type
* #psa_algorithm_t such that #PSA_ALG_IS_MAC(\p alg)
* is true). This may be a truncated or untruncated
* MAC algorithm.
*
* \return The corresponding base MAC algorithm.
* \return Unspecified if \p alg is not a supported
* MAC algorithm.
*/
#define PSA_ALG_FULL_LENGTH_MAC(alg) \
((alg) & ~PSA_ALG_MAC_TRUNCATION_MASK)
/** Length to which a MAC algorithm is truncated.
*
* \param alg A MAC algorithm identifier (value of type