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

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Declaration

from crypto_sizes.h:1064

#define PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(key_type, key_bits) \ ((PSA_KEY_TYPE_IS_ECC_KEY_PAIR(key_type) || \ PSA_KEY_TYPE_IS_DH_KEY_PAIR(key_type)) ? PSA_BITS_TO_BYTES(key_bits) : 0u)

Arguments

Argument

Description

key_type

A supported key type.

key_bits

The size of the key in bits.

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.

References

Code

Location

#define PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(key_type, key_bits) \

crypto_sizes.h:1064

PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(slot->attr.type, slot->attr.bits);

psa_crypto.c:7697

PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE macro

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