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PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE macro
Sufficient output buffer size for psa_raw_key_agreement(). This macro returns a compile-time constant if its arguments are compile-time constants. \warning This macro may evaluate its arguments multiple times or zero times, so you should not pass arguments that contain side effects. See also #PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE.
Syntax
#define PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(key_type, key_bits) \
(PSA_KEY_TYPE_IS_ECC_KEY_PAIR(key_type) ? \
PSA_BITS_TO_BYTES(key_bits) : \
0)
Return value
If the parameters are valid and supported, return a buffer size in bytes that guarantees that psa_raw_key_agreement() will not fail with #PSA_ERROR_BUFFER_TOO_SMALL. If the parameters are a valid combination that is not supported, return either a sensible size or 0. If the parameters are not valid, the return value is unspecified.