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PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE macro
Sufficient output buffer size for psa_asymmetric_decrypt(). This macro returns a sufficient buffer size for a plaintext produced using a key of the specified type and size, with the specified algorithm. Note that the actual size of the plaintext may be smaller, depending on the algorithm. \warning This function may call its arguments multiple times or zero times, so you should not pass arguments that contain side effects.
Syntax
#define PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(key_type, key_bits, alg) \
(PSA_KEY_TYPE_IS_RSA(key_type) ? \
PSA_BITS_TO_BYTES(key_bits) - PSA_RSA_MINIMUM_PADDING_SIZE(alg) : \
0u)
Return value
If the parameters are valid and supported, return a buffer size in bytes that guarantees that psa_asymmetric_decrypt() 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.