PSA_ALG_AT_LEAST_THIS_LENGTH_MAC macro

Macro to build a MAC minimum-MAC-length wildcard algorithm. A minimum-MAC-length MAC wildcard algorithm permits all MAC algorithms sharing the same base algorithm, and where the (potentially truncated) MAC length of the specific algorithm is equal to or larger then the wildcard algorithm's minimum MAC length.

Syntax

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Summary

Declaration

from crypto_values.h:1127

#define PSA_ALG_AT_LEAST_THIS_LENGTH_MAC(mac_alg, min_mac_length) \ (PSA_ALG_TRUNCATED_MAC(mac_alg, min_mac_length) | \ PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG)

Arguments

Argument

Description

mac_alg

A MAC algorithm identifier (value of type #psa_algorithm_t such that #PSA_ALG_IS_MAC(\p mac_alg) is true).

min_mac_length

Desired minimum length of the message authentication code in bytes. This must be at most the untruncated length of the MAC and must be at least 1.

Return value

The corresponding MAC wildcard algorithm with the specified minimum length. Unspecified if \p mac_alg is not a supported MAC algorithm or if \p min_mac_length is less than 1 or too large for the specified MAC algorithm.

Notes

When setting the minimum required MAC length to less than the smallest MAC length allowed by the base algorithm, this effectively becomes an 'any-MAC-length-allowed' policy for that base algorithm.

References

Code

Location

#define PSA_ALG_AT_LEAST_THIS_LENGTH_MAC(mac_alg, min_mac_length) \

crypto_values.h:1127

return PSA_ALG_AT_LEAST_THIS_LENGTH_MAC(alg1, restricted_len);

psa_crypto.c:886

PSA_ALG_AT_LEAST_THIS_LENGTH_MAC macro

Syntax

Arguments

Return value

Notes

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