PSA_MAC_LENGTH macro

The size of the output of psa_mac_sign_finish(), in bytes. This is also the MAC size that psa_mac_verify_finish() expects. \warning This macro may evaluate its arguments multiple times or zero times, so you should not pass arguments that contain side effects.

Syntax

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Summary

Declaration

from crypto_sizes.h:328

#define PSA_MAC_LENGTH(key_type, key_bits, alg) \ ((alg) & PSA_ALG_MAC_TRUNCATION_MASK ? PSA_MAC_TRUNCATED_LENGTH(alg) : \ PSA_ALG_IS_HMAC(alg) ? PSA_HASH_LENGTH(PSA_ALG_HMAC_GET_HASH(alg)) : \ PSA_ALG_IS_BLOCK_CIPHER_MAC(alg) ? PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) : \ ((void) (key_type), (void) (key_bits), 0u))

Arguments

Argument

Description

key_type

The type of the MAC key.

key_bits

The size of the MAC key in bits.

alg

A MAC algorithm (\c PSA_ALG_XXX value such that #PSA_ALG_IS_MAC(\p alg) is true).

Return value

The MAC size for the specified algorithm with the specified key parameters. 0 if the MAC algorithm is not recognized. Either 0 or the correct size for a MAC algorithm that the implementation recognizes, but does not support. Unspecified if the key parameters are not consistent with the algorithm.